Pinout of DDR1, DDR2, DDR3 RAM connectors

Memory DDR SDRAM DIMM (184 pin, Unbuffered)

Memory module DDR SDRAM DIMM (184 pin, Unbuffered)

Memory module dimensions DDR SDRAM DIMM (184 pin, Unbuffered)

Pinout of DDR SDRAM DIMM connector (184 pin, Unbuffered) Download PDF

Slot pin #	Name	Description
1	VREF	Power supply for reference
2	DQ0	Data input / output
3	VSS	Ground
4	DQ1	Data input / output
5	DQS0	Data strobe input / output
6	DQ2	Data input / output
7	VDD	Power supply (2,5V)
8	DQ3	Data input / output
9	NC	Not connected
10	NC	Not connected
11	VSS	Ground
12	DQ8	Data input / output
13	DQ9	Data input / output
14	DQS1	Data strobe input / output
15	VDD	Power supply (2,5V)
16	CK1	Clock input
17	CK1#	Clock input
18	VSS	Ground
19	DQ10	Data input / output
20	DQ11	Data input / output
21	CKE0	Clock enable input
22	VDD	Power supply (2,5V)
23	DQ16	Data input / output
24	DQ17	Data input / output
25	DQS2	Data strobe input / output
26	VSS	Ground
27	A9	Address input (multiplexed)
28	DQ18	Data input / output
29	A7	Address input (multiplexed)
30	VDD	Power supply (2,5V)
31	DQ19	Data input / output
32	A5	Address input (multiplexed)
33	DQ24	Data input / output
34	VSS	Ground
35	DQ25	Data input / output
36	DQS3	Data strobe input / output
37	A4	Address input (multiplexed)
38	VDD	Power supply (2,5V)
39	DQ26	Data input / output
40	DQ27	Data input / output
41	A2	Address input (multiplexed)
42	VSS	Ground
43	A1	Address input (multiplexed)
44	CB0	Not connected
45	CB1	Not connected
46	VDD	Power supply (2,5V)
47	DQS8	Data strobe input / output
48	A0	Address input (multiplexed)
49	CB2	Not connected
50	VSS	Ground
51	CB3	Not connected
52	BA1	Bank select address
53	DQ32	Data input / output
54	VDD	Power supply (2,5V)
55	DQ33	Data input / output
56	DQS4	Data strobe input / output
57	DQ34	Data input / output
58	VSS	Ground
59	BA0	Bank select address
60	DQ35	Data input / output
61	DQ40	Data input / output
62	VDD	Power supply (2,5V)
63	WE#	Write enable
64	DQ41	Data input / output
65	CAS#	Column address strobe
66	VSS	Ground
67	DQS5	Data strobe input / output
68	DQ42	Data input / output
69	DQ43	Data input / output
70	VDD	Power supply (2,5V)
71	NC	Not connected
72	DQ48	Data input / output
73	DQ49	Data input / output
74	VSS	Ground
75	CK2#	Clock input
76	CK2	Clock input
77	VDD	Power supply (2,5V)
78	DQS6	Data strobe input / output
79	DQ50	Data input / output
80	DQ51	Data input / output
81	VSS	Ground
82	NC	Not connected
83	DQ56	Data input / output
84	DQ57	Data input / output
85	VDD	Power supply (2,5V)
86	DQS7	Data strobe input / output

87	DQ58	Data input / output
88	DQ59	Data input / output
89	VSS	Ground
90	NC	Not connected
91	SDA	Serial data I/O
92	SCL	Serial clock
93	VSS	Ground
94	DQ4	Data input / output
95	DQ5	Data input / output
96	VDD	Power supply (2,5V)
97	DQS9	Data strobe input / output
98	DQ6	Data input / output
99	DQ7	Data input / output
100	VSS	Ground
101	NC	Not connected
102	NC	Not connected
103	NC	Not connected
104	VDD	Power supply (2,5V)
105	DQ12	Data input / output
106	DQ13	Data input / output
107	DQS10	Data strobe input / output
108	VDD	Power supply (2,5V)
109	DQ14	Data input / output
110	DQ15	Data input / output
111	CKE1	Clock enable input
112	VDD	Power supply (2,5V)
113	NC	Not connected
114	DQ20	Data input / output
115	A12	Address input (multiplexed)
116	VSS	Ground
117	DQ21	Data input / output
118	A11	Address input (multiplexed)
119	DQS11	Data strobe input / output
120	VDD	Power supply (2,5V)
121	DQ22	Data input / output
122	A8	Address input (multiplexed)
123	DQ23	Data input / output
124	VSS	Ground
125	A6	Address input (multiplexed)
126	DQ28	Data input / output
127	DQ29	Data input / output
128	VDD	Power supply (2,5V)
129	DQS12	Data strobe input / output
130	A3	Address input (multiplexed)
131	DQ30	Data input / output
132	VSS	Ground
133	DQ31	Data input / output
134	CB4	Not connected
135	CB5	Not connected
136	VDD	Power supply (2,5V)
137	CK0	Clock input
138	CK0#	Clock input
139	VSS	Ground
140	DQS17	Data strobe input / output
141	A10	Address input (multiplexed)
142	CB6	Not connected
143	VDD	Power supply (2,5V)
144	CB7	Not connected
145	VSS	Ground
146	DQ36	Data input / output
147	DQ37	Data input / output
148	VDD	Power supply (2,5V)
149	DQS13	Data strobe input / output
150	DQ38	Data input / output
151	DQ39	Data input / output
152	VSS	Ground
153	DQ44	Data input / output
154	RAS#	Row address strobe
155	DQ45	Data input / output
156	VDD	Power supply (2,5V)
157	S0#	Chip select input
158	S1#	Chip select input
159	DQS14	Data strobe input / output
160	VSS	Ground
161	DQ46	Data input / output
162	DQ47	Data input / output
163	NC	Not connected
164	VDD	Power supply (2,5V)
165	DQ52	Data input / output
166	DQ53	Data input / output
167	NC	Not connected
168	VDD	Power supply (2,5V)
169	DQS15	Data strobe input / output
170	DQ54	Data input / output
171	DQ55	Data input / output
172	VDD	Power supply (2,5V)
173	NC	Not connected
174	DQ60	Data input / output
175	DQ61	Data input / output
176	VSS	Ground
177	DQS16	Data strobe input / output
178	DQ62	Data input / output
179	DQ63	Data input / output
180	VDD	Power supply (2,5V)
181	SA0	Address in EEPROM
182	SA1	Address in EEPROM
183	SA2	Address in EEPROM
184	VDDSPD	Serial EEPROM power supply (2,3-3,6V)

Memory DDR2 SDRAM DIMM Unbuffered Module (240 pin)

Memory DDR2 SDRAM DIMM (240 pin, Unbuffered)

240 pin DDR2 connector

Memory DDR2 SDRAM DIMM Unbuffered Module (240 pin) Download

Connector##	Description	Connector#	Description
1	VREF	121	VSS
2	VSS	122	DQ4
3	DQ0	123	DQ5
4	DQ1	124	VSS
5	VSS	125	DM0
6	/DQS0	126	NC
7	DQS0	127	VSS
8	VSS	128	DQ6
9	DQ2	129	DQ7
10	DQ3	130	VSS
11	VSS	131	DQ12
12	DQ8	132	DQ13
13	DQ9	133	VSS
14	VSS	134	DM1
15	/DQS1	135	NC
16	DQS1	136	VSS
17	VSS	137	CK1
18	NC	138	/CK1
19	NC	139	VSS
20	VSS	140	DQ14
21	DQ10	141	DQ15
22	DQ11	142	VSS
23	VSS	143	DQ20
24	DQ16	144	DQ21
25	DQ17	145	VSS
26	VSS	146	DM2
27	/DQS2	147	NC
28	DQS2	148	VSS
29	VSS	149	DQ22
30	DQ18	150	DQ23
31	DQ19	151	VSS
32	VSS	152	DQ28
33	DQ24	153	DQ29
34	DQ25	154	VSS
35	VSS	155	DM3
36	/DQS3	156	NC
37	DQS3	157	VSS
38	VSS	158	DQ30
39	DQ26	159	DQ31
40	DQ27	160	VSS
41	VSS	161	NC
42	NC	162	NC
43	NC	163	VSS
44	VSS	164	NC
45	NC	165	NC
46	NC	166	VSS
47	VSS	167	NC
48	NC	168	NC
49	NC	169	VSS
50	VSS	170	VDDQ
51	VDDQ	171	CKE1
52	CKE0	172	VDD
53	VDD	173	NC
54	NC	174	NC
55	NC	175	VDDQ
56	VDDQ	176	A12
57	A11	177	A9
58	A7	178	VDD
59	VDD	179	A8
60	A5	180	A6
61	A4	181	VDDQ
62	VDDQ	182	A3
63	A2	183	A1
64	VDD	184	VDD

KEY
65	VSS	185	CK0
66	VSS	186	/CK0
67	VDD	187	VDD
68	NC	188	A0
69	VDD	189	VDD
70	A10/AP	190	BA1
71	BA0	191	VDDQ
72	VDDQ	192	/RAS
73	/WE	193	/CS0
74	/CAS	194	VDDQ
75	VDDQ	195	ODT0
76	/CS1	196	A13
77	ODT1	197	VDD
78	VDDQ	198	VSS
79	VSS	199	DQ36
80	DQ32	200	DQ37
81	DQ33	201	VSS
82	VSS	202	DM4
83	/DQS4	203	NC
84	DQS4	204	VSS
85	VSS	205	DQ38
86	DQ34	206	DQ39
87	DQ35	207	VSS
88	VSS	208	DQ44
89	DQ40	209	DQ45
90	DQ41	210	VSS
91	VSS	211	DM5
92	/DQS5	212	NC
93	DQS5	213	VSS
94	VSS	214	DQ46
95	DQ42	215	DQ47
96	DQ43	216	VSS
97	VSS	217	DQ52
98	DQ48	218	DQ53
99	DQ49	219	VSS
100	VSS	220	CK2
101	SA2	221	/CK2
102	NC	222	VSS
103	VSS	223	DM6
104	/DQS6	224	NC
105	DQS6	225	VSS
106	VSS	226	DQ54
107	DQ50	227	DQ55
108	DQ51	228	VSS
109	VSS	229	DQ60
110	DQ56	230	DQ61
111	DQ57	231	VSS
112	VSS	232	DM7
113	/DQS7	233	NC
114	DQS7	234	VSS
115	VSS	235	DQ62
116	DQ58	236	DQ63
117	DQ59	237	VSS
118	VSS	238	VDDSPD
119	SDA	239	SA0
120	SCL	240	SA1

Memory DDR3 SDRAM DIMM Unbuffered Module (240 pin)

240 pin DDR3 connector

Pin descriptions and other pinout information can be found in the documentation for Micron DDR3 memory modules. Download

Comments: 2

#2
laptop ddr3 (Monday, 15 September 2025 09:59)

3.33 volt in ddr3 for laptop
#1
bk (Monday, 21 July 2025 16:39)

ram pin deatils