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Chapter 6. Memory > DDR3 DIMM Pinouts

DDR3 DIMM Pinouts

Table 6.20 shows the pinout configuration of a 240-pin DDR3 SDRAM DIMM. Pins 1–120 are on the front side, and pins 121–240 are on the back. All pins should be gold plated.

Table 6.20. 240-Pin DDR3 DIMM Pinouts
PinSignal FrontPinSignal Back
1VREFDQ121VSS
2VSS122DQ4
3DQ0123DQ5
4DQ1124VSS
5VSS125DM0, DQS9
6DQS0126NC, DQS9
7DQS0127VSS
8VSS128DQ6
9DQ2129DQ7
10DQ3130VSS
11VSS131DQ12
12DQ8132DQ13
13DQ9133VSS
14VSS134DM1, DQS10
15DQS1135NC, DQS10
16DQS1136VSS
17VSS137DQ14
18DQ10138DQ15
19DQ11139VSS
20VSS140DQ20
21DQ16141DQ21
22DQ17142VSS
23VSS143DQS11
24DQS2144DQS11
25DQS2145VSS
26VSS146DQ22
27DQ18147DQ23
28DQ19148VSS
29VSS149DQ28
30DQ24150DQ29
31DQ25151VSS
32VSS152DM3, DQS12
33DQS3153DQS12
34DQS3154VSS
35VSS155DQ30
36DQ26156DQ31
37DQ27157VSS
38VSS158CB4
39CB0159CB5
40CB1160VSS
41VSS161DM8, DQS17
42DQS8162DQS17
43DQS8163VSS
44VSS164CB6
45CB2165CB7
46CB3166VSS
47VSS167TEST
48NC168Reset
KeyKeyKeyKey
49NC169CKE1
50CKE0170VDD
51VDD171A15
52BA2172A14
53ERR-OUT(NC)173VDD
54VDD174A12
55A11175A9
56A7176VDD
57VDD177A8
58A5178A6
59A4179VDD
60VDD180A3
61A2181A1
62VDD182VDD
63CK1/NC183VDD
64CK1/NC184CK0
65VDD185CK0
66VDD186VDD
67VREFCA187NF
68Par_In(NC)188A0
69VDD189VDD
70A10190BA1/BA0
71BA0/BA1191VDD
72VDD192RAS
73WE193S0
74CAS194VDD
75VDD195ODT0
76S1196A13
77ODT1197VDD
78VDD198NF
79RFUSPD199VSS
80VSS200DQ36
81DQ32201DQ37
82DQ33202VSS
83VSS203DM4, DQS13
84DQS4204DQS13
85DQS4205VSS
86VSS206DQ38
87DQ34207DQ39
88DQ35208VSS
89VSS209DQ44
90DQ40210DQ45
91DQ41211VSS
92VSS212DM5, DQS14
93DQS5213DQS14
94DQS5214VSS
95VSS215DQ46
96DQ42216DQ47
97DQ43217VSS
98VSS218DQ52
99DQ48219DQ53
100DQ49220VSS
101VSS221DM6, DQS15
102DQS6222DQS15
103DQS6223VSS
104VSS224DQ54
105DQ50225DQ55
106DQ51226VSS
107VSS227DQ60
108DQ56228DQ61
109DQ57229VSS
110VSS230DM7, DQS16
111DQS7231DQS16
112DQS7232VSS
113VSS233DQ62
114DQ58234DQ63
115DQ59235VSS
116VSS236VDDSPD
117SA0237SA1
118SCL238SDA
119VSS239VSS
120VTT240VTT
NC = No Connect
NF = No Function
NU = Not Usable
RFU = Reserved Future Use


The 240-pin DDR3 DIMMs use two notches on each side to enable compatibility with both low- and high-profile latched sockets. The connector key is offset with respect to the center of the DIMM to prevent inserting it backward in the socket. The key notch is positioned in the center of the area between pins 48 and 49 on the front (168/169 on the back), and there is no voltage keying because all DDR3 DIMMs run on 1.5V.

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