diff --git a/device/mellanox/x86_64-mlnx_msn2700-r0/plugins/sfputil.py b/device/mellanox/x86_64-mlnx_msn2700-r0/plugins/sfputil.py
index b5f2a335b0..9e5ca40832 100644
--- a/device/mellanox/x86_64-mlnx_msn2700-r0/plugins/sfputil.py
+++ b/device/mellanox/x86_64-mlnx_msn2700-r0/plugins/sfputil.py
@@ -41,8 +41,8 @@ SFP_PORT_NAME_CONVENTION = "sfp{}"
 
 # magic code defnition for port number, qsfp port position of each hwsku
 # port_position_tuple = (PORT_START, QSFP_PORT_START, PORT_END, PORT_IN_BLOCK, EEPROM_OFFSET)
-hwsku_dict = {'ACS-MSN2700': 0, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'LS-SN2700': 0, 'ACS-MSN2740': 0, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2010': 3, 'ACS-MSN3700': 0, 'ACS-MSN3700C': 0, 'ACS-MSN3800': 4, 'Mellanox-SN3800-D112C8': 4, 'ACS-MSN4700': 0}
-port_position_tuple_list = [(0, 0, 31, 32, 1), (0, 0, 15, 16, 1), (0, 48, 55, 56, 1), (0, 18, 21, 22, 1), (0, 0, 63, 64, 1)]
+hwsku_dict = {'ACS-MSN2700': 0, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, "LS-SN2700":0, 'ACS-MSN2740': 0, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2010': 3, 'ACS-MSN3700': 0, 'ACS-MSN3700C': 0, 'ACS-MSN3800': 4, 'Mellanox-SN3800-D112C8': 4, 'ACS-MSN4700': 0, 'ACS-MSN3420': 5}
+port_position_tuple_list = [(0, 0, 31, 32, 1), (0, 0, 15, 16, 1), (0, 48, 55, 56, 1), (0, 18, 21, 22, 1), (0, 0, 63, 64, 1), (0, 48, 59, 60, 1)]
 
 def log_info(msg, also_print_to_console=False):
     syslog.openlog("sfputil")
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers.json.j2 b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers.json.j2
new file mode 120000
index 0000000000..7888381852
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers.json.j2
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn3700-r0/ACS-MSN3700/buffers.json.j2
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t0.j2 b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t0.j2
new file mode 120000
index 0000000000..85f0b6b6b3
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t0.j2
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn3700-r0/ACS-MSN3700/buffers_defaults_t0.j2
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t1.j2 b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t1.j2
new file mode 120000
index 0000000000..3bb496a510
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/buffers_defaults_t1.j2
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn3700-r0/ACS-MSN3700/buffers_defaults_t1.j2
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/pg_profile_lookup.ini b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/pg_profile_lookup.ini
new file mode 120000
index 0000000000..252ae8d414
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/pg_profile_lookup.ini
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn3700-r0/ACS-MSN3700/pg_profile_lookup.ini
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/port_config.ini b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/port_config.ini
new file mode 100644
index 0000000000..df63cbe39a
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/port_config.ini
@@ -0,0 +1,61 @@
+# name          lanes               alias     index
+Ethernet0       0                   etp1      0
+Ethernet4       4                   etp2      1
+Ethernet8       8                   etp3      2
+Ethernet12      12                  etp4      3
+Ethernet16      16                  etp5      4
+Ethernet20      20                  etp6      5
+Ethernet24      24                  etp7      6
+Ethernet28      28                  etp8      7
+Ethernet32      32                  etp9      8
+Ethernet36      36                  etp10     9
+Ethernet40      40                  etp11     10
+Ethernet44      44                  etp12     11
+Ethernet48      48                  etp13     12
+Ethernet52      52                  etp14     13
+Ethernet56      56                  etp15     14
+Ethernet60      60                  etp16     15
+Ethernet64      64                  etp17     16
+Ethernet68      68                  etp18     17
+Ethernet72      72                  etp19     18
+Ethernet76      76                  etp20     19
+Ethernet80      80                  etp21     20
+Ethernet84      84                  etp22     21
+Ethernet88      88                  etp23     22
+Ethernet92      92                  etp24     23
+Ethernet96      96                  etp25     24
+Ethernet100     100                 etp26     25
+Ethernet104     104                 etp27     26
+Ethernet108     108                 etp28     27
+Ethernet112     112                 etp29     28
+Ethernet116     116                 etp30     29
+Ethernet120     120                 etp31     30
+Ethernet124     124                 etp32     31
+Ethernet128     128                 etp33     32
+Ethernet132     132                 etp34     33
+Ethernet136     136                 etp35     34
+Ethernet140     140                 etp36     35
+Ethernet144     144                 etp37     36
+Ethernet148     148                 etp38     37
+Ethernet152     152                 etp39     38
+Ethernet156     156                 etp40     39
+Ethernet160     160                 etp41     40
+Ethernet164     164                 etp42     41
+Ethernet168     168                 etp43     42
+Ethernet172     172                 etp44     43
+Ethernet176     176                 etp45     44
+Ethernet180     180                 etp46     45
+Ethernet184     184                 etp47     46
+Ethernet188     188                 etp48     47
+Ethernet192     192,193,194,195     etp49     48
+Ethernet196     196,197,198,199     etp50     49
+Ethernet200     200,201,202,203     etp51     50
+Ethernet204     204,205,206,207     etp52     51
+Ethernet208     208,209,210,211     etp53     52
+Ethernet212     212,213,214,215     etp54     53
+Ethernet216     216,217,218,219     etp55     54
+Ethernet220     220,221,222,223     etp56     55
+Ethernet224     224,225,226,227     etp57     56
+Ethernet228     228,229,230,231     etp58     57
+Ethernet232     232,233,234,235     etp59     58
+Ethernet236     236,237,238,239     etp60     59
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/qos.json.j2 b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/qos.json.j2
new file mode 120000
index 0000000000..379f542893
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/qos.json.j2
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn3700-r0/ACS-MSN3700/qos.json.j2
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai.profile b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai.profile
new file mode 100644
index 0000000000..a30106c867
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai.profile
@@ -0,0 +1 @@
+SAI_INIT_CONFIG_FILE=/usr/share/sonic/hwsku/sai_3420.xml
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai_3420.xml b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai_3420.xml
new file mode 100644
index 0000000000..5064ee3ef8
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/ACS-MSN3420/sai_3420.xml
@@ -0,0 +1,442 @@
+<?xml version="1.0"?>
+<root>
+    <platform_info type="3420">
+
+        <!-- Device MAC address  -->
+        <device-mac-address>00:02:03:04:05:80</device-mac-address>
+
+        <!-- ISSU enabled -->
+        <issu-enabled>1</issu-enabled>
+
+        <!-- Number of ports in the following port list -->
+        <number-of-physical-ports>60</number-of-physical-ports>
+
+        <!-- List of ports in the device -->
+        <ports-list>
+            <port-info>
+                <local-port>105</local-port>
+                <width>1</width>
+                <module>0</module>
+
+                <!-- 0 none, 1=2, 2=4, 3=2,4 -->
+                <breakout-modes>0</breakout-modes>
+
+                <!-- (BITMASK) 2 - 1Gb , 16 - 10Gb , 32 - 40Gb , 384 - 50Gb , 1536 - 100Gb , 4096 - 200Gb -->
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>106</local-port>
+                <width>1</width>
+                <module>1</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>49</local-port>
+                <width>1</width>
+                <module>2</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>113</local-port>
+                <width>1</width>
+                <module>3</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>114</local-port>
+                <width>1</width>
+                <module>4</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>50</local-port>
+                <width>1</width>
+                <module>5</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>115</local-port>
+                <width>1</width>
+                <module>6</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>116</local-port>
+                <width>1</width>
+                <module>7</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>41</local-port>
+                <width>1</width>
+                <module>8</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>121</local-port>
+                <width>1</width>
+                <module>9</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>122</local-port>
+                <width>1</width>
+                <module>10</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>42</local-port>
+                <width>1</width>
+                <module>11</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>123</local-port>
+                <width>1</width>
+                <module>12</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>124</local-port>
+                <width>1</width>
+                <module>13</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>43</local-port>
+                <width>1</width>
+                <module>14</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>57</local-port>
+                <width>1</width>
+                <module>15</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>58</local-port>
+                <width>1</width>
+                <module>16</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>44</local-port>
+                <width>1</width>
+                <module>17</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>59</local-port>
+                <width>1</width>
+                <module>18</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>60</local-port>
+                <width>1</width>
+                <module>19</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>33</local-port>
+                <width>1</width>
+                <module>20</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>51</local-port>
+                <width>1</width>
+                <module>21</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>52</local-port>
+                <width>1</width>
+                <module>22</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>34</local-port>
+                <width>1</width>
+                <module>23</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>53</local-port>
+                <width>1</width>
+                <module>24</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>54</local-port>
+                <width>1</width>
+                <module>25</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>35</local-port>
+                <width>1</width>
+                <module>26</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>45</local-port>
+                <width>1</width>
+                <module>27</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>46</local-port>
+                <width>1</width>
+                <module>28</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>36</local-port>
+                <width>1</width>
+                <module>29</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>47</local-port>
+                <width>1</width>
+                <module>30</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>48</local-port>
+                <width>1</width>
+                <module>31</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>1</local-port>
+                <width>1</width>
+                <module>32</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>37</local-port>
+                <width>1</width>
+                <module>33</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>38</local-port>
+                <width>1</width>
+                <module>34</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>2</local-port>
+                <width>1</width>
+                <module>35</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>39</local-port>
+                <width>1</width>
+                <module>36</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>40</local-port>
+                <width>1</width>
+                <module>37</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>3</local-port>
+                <width>1</width>
+                <module>38</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>4</local-port>
+                <width>1</width>
+                <module>39</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>5</local-port>
+                <width>1</width>
+                <module>40</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>6</local-port>
+                <width>1</width>
+                <module>41</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>7</local-port>
+                <width>1</width>
+                <module>42</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>8</local-port>
+                <width>1</width>
+                <module>43</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>9</local-port>
+                <width>1</width>
+                <module>44</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>10</local-port>
+                <width>1</width>
+                <module>45</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>11</local-port>
+                <width>1</width>
+                <module>46</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>12</local-port>
+                <width>1</width>
+                <module>47</module>
+                <breakout-modes>0</breakout-modes>
+                <port-speed>64</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>17</local-port>
+                <width>4</width>
+                <module>48</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>21</local-port>
+                <width>4</width>
+                <module>49</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>25</local-port>
+                <width>4</width>
+                <module>50</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>29</local-port>
+                <width>4</width>
+                <module>51</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>89</local-port>
+                <width>4</width>
+                <module>52</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>93</local-port>
+                <width>4</width>
+                <module>53</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>81</local-port>
+                <width>4</width>
+                <module>54</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>85</local-port>
+                <width>4</width>
+                <module>55</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>73</local-port>
+                <width>4</width>
+                <module>56</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>77</local-port>
+                <width>4</width>
+                <module>57</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>65</local-port>
+                <width>4</width>
+                <module>58</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+            <port-info>
+                <local-port>69</local-port>
+                <width>4</width>
+                <module>59</module>
+                <breakout-modes>3</breakout-modes>
+                <port-speed>1536</port-speed>
+            </port-info>
+        </ports-list>
+    </platform_info>
+</root>
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/default_sku b/device/mellanox/x86_64-mlnx_msn3420-r0/default_sku
new file mode 100644
index 0000000000..a572bdce4e
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/default_sku
@@ -0,0 +1 @@
+ACS-MSN3420 t1
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/platform_components.json b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_components.json
new file mode 100644
index 0000000000..f3ea5918a0
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_components.json
@@ -0,0 +1,12 @@
+{
+    "chassis": {
+        "x86_64-mlnx_msn3420-r0": {
+            "component": {
+                "BIOS": { },
+                "CPLD1": { },
+                "CPLD2": { },
+                "CPLD3": { }
+            }
+        }
+    }
+}
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/platform_reboot b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_reboot
new file mode 120000
index 0000000000..43c8ea5674
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_reboot
@@ -0,0 +1 @@
+../x86_64-mlnx_msn2700-r0/platform_reboot
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/platform_wait b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_wait
new file mode 120000
index 0000000000..4b30bd4298
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/platform_wait
@@ -0,0 +1 @@
+../x86_64-mlnx_msn2700-r0/platform_wait
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/eeprom.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/eeprom.py
new file mode 120000
index 0000000000..b4e2a6a616
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/eeprom.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/eeprom.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/psuutil.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/psuutil.py
new file mode 120000
index 0000000000..9f724238a8
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/psuutil.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/psuutil.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmget.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmget.py
new file mode 120000
index 0000000000..2e84f435ab
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmget.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/sfplpmget.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmset.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmset.py
new file mode 120000
index 0000000000..6a88bac304
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfplpmset.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/sfplpmset.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfpreset.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfpreset.py
new file mode 120000
index 0000000000..fef2063e34
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfpreset.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/sfpreset.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfputil.py b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfputil.py
new file mode 120000
index 0000000000..45909b880f
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/plugins/sfputil.py
@@ -0,0 +1 @@
+../../x86_64-mlnx_msn2700-r0/plugins/sfputil.py
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/pmon_daemon_control.json b/device/mellanox/x86_64-mlnx_msn3420-r0/pmon_daemon_control.json
new file mode 120000
index 0000000000..435a2ce7c0
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/pmon_daemon_control.json
@@ -0,0 +1 @@
+../x86_64-mlnx_msn2700-r0/pmon_daemon_control.json
\ No newline at end of file
diff --git a/device/mellanox/x86_64-mlnx_msn3420-r0/sensors.conf b/device/mellanox/x86_64-mlnx_msn3420-r0/sensors.conf
new file mode 100644
index 0000000000..5718ff9951
--- /dev/null
+++ b/device/mellanox/x86_64-mlnx_msn3420-r0/sensors.conf
@@ -0,0 +1,113 @@
+################################################################################
+# Copyright (c) 2020 Mellanox Technologies
+#
+# Platform specific sensors config for SN3420
+################################################################################
+
+# Temperature sensors
+bus "i2c-2" "i2c-1-mux (chan_id 1)"
+    chip "mlxsw-i2c-*-48"
+        label temp1 "Ambient ASIC Temp"
+
+bus "i2c-7" "i2c-1-mux (chan_id 6)"
+    chip "tmp102-i2c-*-49"
+        label temp1 "Ambient Fan Side Temp (air intake)"
+    chip "tmp102-i2c-*-4a"
+        label temp1 "Ambient Port Side Temp (air exhaust)"
+
+bus "i2c-15" "i2c-1-mux (chan_id 6)"
+    chip "tmp102-i2c-15-49"
+        label temp1 "Ambient COMEX Temp"
+
+# Power controllers
+bus "i2c-5" "i2c-1-mux (chan_id 4)"
+    chip "tps53679-i2c-*-70"
+        label in1 "PMIC-1 PSU 12V Rail (in)"
+        label in2 "PMIC-1 PSU 12V Rail (in)"
+        label in3 "PMIC-1 COMEX 1.8V Rail (out)"
+        label in4 "PMIC-1 COMEX 1.05V Rail (out)"
+        label temp1 "PMIC-1 Temp 1"
+        label temp2 "PMIC-1 Temp 2"
+        label power1 "PMIC-1 COMEX 1.8V Rail Pwr (out)"
+        label power2 "PMIC-1 COMEX 1.05V Rail Pwr (out)"
+        label curr1 "PMIC-1 COMEX 1.8V Rail Curr (out)"
+        label curr2 "PMIC-1 COMEX 1.05V Rail Curr (out)"
+    chip "tps53679-i2c-*-71"
+        label in1 "PMIC-2 PSU 12V Rail (in)"
+        label in2 "PMIC-2 PSU 12V Rail (in)"
+        label in3 "PMIC-2 COMEX 1.8V Rail (out)"
+        label in4 "PMIC-2 COMEX 1.05V Rail (out)"
+        label temp1 "PMIC-2 Temp 1"
+        label temp2 "PMIC-2 Temp 2"
+        label power1 "PMIC-2 COMEX 1.8V Rail Pwr (out)"
+        label power2 "PMIC-2 COMEX 1.05V Rail Pwr (out)"
+        label curr1 "PMIC-2 COMEX 1.8V Rail Curr (out)"
+        label curr2 "PMIC-2 COMEX 1.05V Rail Curr (out)"
+
+bus "i2c-15" "i2c-1-mux (chan_id 6)"
+    chip "tps53679-i2c-*-58"
+        label in1 "PMIC-3 PSU 12V Rail (in)"
+        label in2 "PMIC-3 PSU 12V Rail (in)"
+        label in3 "PMIC-3 COMEX 1.8V Rail (out)"
+        label in4 "PMIC-3 COMEX 1.05V Rail (out)"
+        label temp1 "PMIC-3 Temp 1"
+        label temp2 "PMIC-3 Temp 2"
+        label power1 "PMIC-3 COMEX 1.8V Rail Pwr (out)"
+        label power2 "PMIC-3 COMEX 1.05V Rail Pwr (out)"
+        label curr1 "PMIC-3 COMEX 1.8V Rail Curr (out)"
+        label curr2 "PMIC-3 COMEX 1.05V Rail Curr (out)"
+    chip "tps53679-i2c-*-61"
+        label in1 "PMIC-4 PSU 12V Rail (in)"
+        label in2 "PMIC-4 PSU 12V Rail (in)"
+        label in3 "PMIC-4 COMEX 1.8V Rail (out)"
+        label in4 "PMIC-4 COMEX 1.05V Rail (out)"
+        label temp1 "PMIC-4 Temp 1"
+        label temp2 "PMIC-4 Temp 2"
+        label power1 "PMIC-4 COMEX 1.8V Rail Pwr (out)"
+        label power2 "PMIC-4 COMEX 1.05V Rail Pwr (out)"
+        label curr1 "PMIC-4 COMEX 1.8V Rail Curr (out)"
+        label curr2 "PMIC-4 COMEX 1.05V Rail Curr (out)"
+
+# Power supplies
+bus "i2c-4" "i2c-1-mux (chan_id 3)"
+    chip "dps460-i2c-*-58"
+        label in1 "PSU-1 220V Rail (in)"
+        label in2 "PSU-1 12V Rail (out)"
+        label fan1 "PSU-1 Fan 1"
+        label temp1 "PSU-1 Temp 1"
+        label temp2 "PSU-1 Temp 2"
+        label temp3 "PSU-1 Temp 3"
+        label power1 "PSU-1 220V Rail Pwr (in)"
+        label power2 "PSU-1 12V Rail Pwr (out)"
+        label curr1 "PSU-1 220V Rail Curr (in)"
+        label curr2 "PSU-1 12V Rail Curr (out)"
+    chip "dps460-i2c-*-59"
+        label in1 "PSU-2 220V Rail (in)"
+        label in2 "PSU-2 12V Rail (out)"
+        label fan1 "PSU-2 Fan 1"
+        label temp1 "PSU-2 Temp 1"
+        label temp2 "PSU-2 Temp 2"
+        label temp3 "PSU-2 Temp 3"
+        label power1 "PSU-2 220V Rail Pwr (in)"
+        label power2 "PSU-2 12V Rail Pwr (out)"
+        label curr1 "PSU-2 220V Rail Curr (in)"
+        label curr2 "PSU-2 12V Rail Curr (out)"
+
+# Chassis fans
+chip "mlxreg_fan-isa-*"
+    label fan1 "Chassis Fan Drawer-1 Tach 1"
+    label fan2 "Chassis Fan Drawer-1 Tach 2"
+    label fan3 "Chassis Fan Drawer-2 Tach 1"
+    label fan4 "Chassis Fan Drawer-2 Tach 2"
+    label fan5 "Chassis Fan Drawer-3 Tach 1"
+    label fan6 "Chassis Fan Drawer-3 Tach 2"
+    label fan7 "Chassis Fan Drawer-4 Tach 1"
+    label fan8 "Chassis Fan Drawer-4 Tach 2"
+    label fan9 "Chassis Fan Drawer-5 Tach 1"
+    label fan10 "Chassis Fan Drawer-5 Tach 2"
+    label fan11 "Chassis Fan Drawer-6 Tach 1"
+    label fan12 "Chassis Fan Drawer-6 Tach 2"
+
+# Miscellaneous
+chip "*-virtual-*"
+    ignore temp1
diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py b/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
index d47110ed8f..c3642331d1 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/chassis.py
@@ -50,8 +50,8 @@ logger = Logger()
 
 # magic code defnition for port number, qsfp port position of each hwsku
 # port_position_tuple = (PORT_START, QSFP_PORT_START, PORT_END, PORT_IN_BLOCK, EEPROM_OFFSET)
-hwsku_dict_port = {'ACS-MSN2010': 3, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2700': 0, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'LS-SN2700':0, 'ACS-MSN2740': 0, 'ACS-MSN3700': 0, 'ACS-MSN3700C': 0, 'ACS-MSN3800': 4, 'Mellanox-SN3800-D112C8': 4, 'ACS-MSN4700': 0}
-port_position_tuple_list = [(0, 0, 31, 32, 1), (0, 0, 15, 16, 1), (0, 48, 55, 56, 1), (0, 18, 21, 22, 1), (0, 0, 63, 64, 1)]
+hwsku_dict_port = {'ACS-MSN2010': 3, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2700': 0, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'LS-SN2700':0, 'ACS-MSN2740': 0, 'ACS-MSN3700': 0, 'ACS-MSN3700C': 0, 'ACS-MSN3800': 4, 'Mellanox-SN3800-D112C8': 4, 'ACS-MSN4700': 0, 'ACS-MSN3420': 5}
+port_position_tuple_list = [(0, 0, 31, 32, 1), (0, 0, 15, 16, 1), (0, 48, 55, 56, 1), (0, 18, 21, 22, 1), (0, 0, 63, 64, 1), (0, 48, 59, 60, 1)]
 
 class Chassis(ChassisBase):
     """Platform-specific Chassis class"""
diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/psu.py b/platform/mellanox/mlnx-platform-api/sonic_platform/psu.py
index 3f2fee433f..6931cc0657 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/psu.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/psu.py
@@ -37,7 +37,7 @@ hwsku_dict_with_unplugable_psu = ['ACS-MSN2010', 'ACS-MSN2100']
 
 # in most SKUs the file psuX_curr, psuX_volt and psuX_power contain current, voltage and power data respectively. 
 # but there are exceptions which will be handled by the following dictionary
-hwsku_dict_psu = {'ACS-MSN3700': 1, 'ACS-MSN3700C': 1, 'ACS-MSN3800': 1, 'Mellanox-SN3800-D112C8': 1, 'ACS-MSN4700': 1}
+hwsku_dict_psu = {'ACS-MSN3700': 1, 'ACS-MSN3700C': 1, 'ACS-MSN3800': 1, 'Mellanox-SN3800-D112C8': 1, 'ACS-MSN4700': 1, 'ACS-MSN3420': 1}
 psu_profile_list = [
     # default filename convention
     {
@@ -45,7 +45,7 @@ psu_profile_list = [
         PSU_VOLTAGE : "power/psu{}_volt",
         PSU_POWER : "power/psu{}_power"
     },
-    # for 3700, 3700c, 3800, 4700
+    # for 3420, 3700, 3700c, 3800, 4700
     {
         PSU_CURRENT : "power/psu{}_curr",
         PSU_VOLTAGE : "power/psu{}_volt_out2",
diff --git a/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py b/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
index 39f91913fe..a9c11848f5 100644
--- a/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
+++ b/platform/mellanox/mlnx-platform-api/sonic_platform/thermal.py
@@ -124,7 +124,7 @@ thermal_api_names = [
     THERMAL_API_GET_HIGH_THRESHOLD
 ]
 
-hwsku_dict_thermal = {'ACS-MSN2700': 0, 'LS-SN2700':0, 'ACS-MSN2740': 3, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2010': 4, 'ACS-MSN3700': 5, 'ACS-MSN3700C': 6, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'ACS-MSN3800': 7, 'Mellanox-SN3800-D112C8': 7, 'ACS-MSN4700': 8}
+hwsku_dict_thermal = {'ACS-MSN2700': 0, 'LS-SN2700':0, 'ACS-MSN2740': 3, 'ACS-MSN2100': 1, 'ACS-MSN2410': 2, 'ACS-MSN2010': 4, 'ACS-MSN3700': 5, 'ACS-MSN3700C': 6, 'Mellanox-SN2700': 0, 'Mellanox-SN2700-D48C8': 0, 'ACS-MSN3800': 7, 'Mellanox-SN3800-D112C8': 7, 'ACS-MSN4700': 8, 'ACS-MSN3420': 9}
 thermal_profile_list = [
     # 2700
     {
@@ -264,6 +264,22 @@ thermal_profile_list = [
                 THERMAL_DEV_FAN_AMBIENT
             ]
         )
+    },
+    # 3420
+    {
+        THERMAL_DEV_CATEGORY_CPU_CORE:(0, 4),
+        THERMAL_DEV_CATEGORY_MODULE:(1, 60),
+        THERMAL_DEV_CATEGORY_PSU:(1, 2),
+        THERMAL_DEV_CATEGORY_CPU_PACK:(0,1),
+        THERMAL_DEV_CATEGORY_GEARBOX:(0,0),
+        THERMAL_DEV_CATEGORY_AMBIENT:(0,
+            [
+                THERMAL_DEV_ASIC_AMBIENT,
+                THERMAL_DEV_COMEX_AMBIENT,
+                THERMAL_DEV_PORT_AMBIENT,
+                THERMAL_DEV_FAN_AMBIENT
+            ]
+        )
     }
 ]