168 pin DRAM DIMM (Unbuffered) Pinout

Personal Computer Memory Module description, 168-pin DIMM Pin out.
The 168-pin DIMM have 84 pins per PWB side.
The Front Side board pinout contains left side pins 1-42, and right side pins 43-84.
The Back Side board pinout has left side pins 85-126, and right side pins 127-168.
168-pin DIMM memory modules would be found in Desktop computers.

Front, Left Side Signals

**168-Pin SDRAM DIMM PinOut**
Pin #	Non-Parity	Parity	72 ECC	80 ECC	Pin Description
1	VSS	VSS	VSS	VSS	Ground
2	DQ0	DQ0	DQ0	DQ0	Data 0
3	DQ1	DQ1	DQ1	DQ1	Data 1
4	DQ2	DQ2	DQ2	DQ2	Data 2
5	DQ3	DQ3	DQ3	DQ3	Data 3
6	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
7	DQ4	DQ4	DQ4	DQ4	Data 4
8	DQ5	DQ5	DQ5	DQ5	Data 5
9	DQ6	DQ6	DQ6	DQ6	Data 6
10	DQ7	DQ7	DQ7	DQ7	Data 7
11	DQ8	DQ8	DQ8	DQ8	Data 8
12	VSS	VSS	VSS	VSS	Ground
13	DQ9	DQ9	DQ9	DQ9	Data 9
14	DQ10	DQ10	DQ10	DQ10	Data 10
15	DQ11	DQ11	DQ11	DQ11	Data 11
16	DQ12	DQ12	DQ12	DQ12	Data 12
17	DQ13	DQ13	DQ13	DQ13	Data 13
18	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
19	DQ14	DQ14	DQ14	DQ14	Data 14
20	DQ15	DQ15	DQ15	DQ15	Data 15
21	CB0	CB0	CB0	CB0	Parity/Check Bit Input/Output 0
22	CB1	CB1	CB1	CB1	Parity/Check Bit Input/Output 1
23	VSS	VSS	VSS	VSS	Ground
24	NC	NC	NC	CB8	Parity/Check Bit Input/Output 8
25	NC	NC	NC	CB9	Parity/Check Bit Input/Output 9
26	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
27	/WE0	/WE0	/WE0	/WE0	Read/Write Input
28	/CAS0	/CAS0	/CAS0	/CAS0	Column Address Strobe 0
29	/CAS1	/CAS1	/CAS1	/CAS1	Column Address Strobe 1
30	/RAS0	/RAS0	/RAS0	/RAS0	Row Address Strobe 0
31	/OE0	/OE0	/OE0	/OE0	Output Enable
32	VSS	VSS	VSS	VSS	Ground
33	A0	A0	A0	A0	Address 0
34	A2	A2	A2	A2	Address 2
35	A4	A4	A4	A4	Address 4
36	A6	A6	A6	A6	Address 6
37	A8	A8	A8	A8	Address 8
38	A10	A10	A10	A10	Address 10
39	A12	A12	A12	A12	Address 12
40	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
41	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
42	NC	NC	NC	NC	No Connection

Front, Right Side Signals

**168-Pin SDRAM DIMM PinOut**
Pin #	Non-Parity	Parity	72 ECC	80 ECC	Pin Description
43	VSS	VSS	VSS	VSS	Ground
44	/OE2	/OE2	/OE2	/OE2
45	/RAS2	/RAS2	/RAS2	/RAS2	Row Address Strobe 2
46	/CAS2	/CAS2	/CAS2	/CAS2	Column Address Strobe 2
47	/CAS3	/CAS3	/CAS3	/CAS3	Column Address Strobe 3
48	/WE2	/WE2	/WE2	/WE2	Read/Write Input
49	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
50	NC	NC	NC	CB10	Parity/Check Bit Input/Output 10
51	NC	NC	NC	CB11	Parity/Check Bit Input/Output 11
52	NC	CB2	CB2	CB2	Parity/Check Bit Input/Output 2
53	NC	CB3	CB3	CB3	Parity/Check Bit Input/Output 3
54	VSS	VSS	VSS	VSS	Ground
55	DQ16	DQ16	DQ16	DQ16	Data 16
56	DQ17	DQ17	DQ17	DQ17	Data 17
57	DQ18	DQ18	DQ18	DQ18	Data 18
58	DQ19	DQ19	DQ19	DQ19	Data 19
59	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
60	DQ20	DQ20	DQ20	DQ20	Data 20
61	NC	NC	NC	NC	No Connection
62	NC	NC	NC	NC	No Connection
63	NC	NC	NC	NC	No Connection
64	VSS	VSS	VSS	VSS	Ground
65	DQ21	DQ21	DQ21	DQ21	Data 21
66	DQ22	DQ22	DQ22	DQ22	Data 22
67	DQ23	DQ23	DQ23	DQ23	Data 23
68	VSS	VSS	VSS	VSS	Ground
69	DQ24	DQ24	DQ24	DQ24	Data 24
70	DQ25	DQ25	DQ25	DQ25	Data 25
71	DQ26	DQ26	DQ26	DQ26	Data 26
72	DQ27	DQ27	DQ27	DQ27	Data 27
73	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
74	DQ28	DQ28	DQ28	DQ28	Data 28
75	DQ29	DQ29	DQ29	DQ29	Data 29
76	DQ30	DQ30	DQ30	DQ30	Data 30
77	DQ31	DQ31	DQ31	DQ31	Data 31
78	VSS	VSS	VSS	VSS	Ground
79	NC	NC	NC	NC	Not connected
80	NC	NC	NC	NC	Not connected
81	NC	NC	NC	NC	Not connected
82	SDA	SDA	SDA	SDA	Serial Data
83	SCL	SCL	SCL	SCL	Serial Clock
84	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC

Back, Left Side Signals

**168-Pin SDRAM DIMM PinOut**
Pin #	Non-Parity	Parity	72 ECC	80 ECC	Pin Description
85	VSS	VSS	VSS	VSS	Ground
86	DQ32	DQ32	DQ32	DQ32	Data 32
87	DQ33	DQ33	DQ33	DQ33	Data 33
88	DQ34	DQ34	DQ34	DQ34	Data 34
89	DQ35	DQ35	DQ35	DQ35	Data 35
90	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
91	DQ36	DQ36	DQ36	DQ36	Data 36
92	DQ37	DQ37	DQ37	DQ37	Data 37
93	DQ38	DQ38	DQ38	DQ38	Data 38
94	DQ39	DQ39	DQ39	DQ39	Data 39
95	DQ40	DQ40	DQ40	DQ40	Data 40
96	VSS	VSS	VSS	VSS	Ground
97	DQ41	DQ41	DQ41	DQ41	Data 41
98	DQ42	DQ42	DQ42	DQ42	Data 42
99	DQ43	DQ43	DQ43	DQ43	Data 43
100	DQ44	DQ44	DQ44	DQ44	Data 44
101	DQ45	DQ45	DQ45	DQ45	Data 45
102	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
103	DQ46	DQ46	DQ46	DQ46	Data 46
104	DQ47	DQ47	DQ47	DQ47	Data 47
105	NC	CB4	CB4	CB4	Parity/Check Bit Input/Output 4
106	NC	CB5	CB5	CB5	Parity/Check Bit Input/Output 5
107	VSS	VSS	VSS	VSS	Ground
108	NC	NC	NC	CB12	Parity/Check Bit Input/Output 12
109	NC	NC	NC	CB13	Parity/Check Bit Input/Output 13
110	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
111	NC	NC	NC	NC	No Connection
112	/CAS4	/CAS4	/CAS4	/CAS4	Column Address Strobe 4
113	/CAS5	/CAS5	/CAS5	/CAS5	Column Address Strobe 5
114	/RAS1	/RAS1	/RAS1	/RAS1	Row Address Strobe 1
115	NC	NC	NC	NC	No Connection
116	VSS	VSS	VSS	VSS	Ground
117	A1	A1	A1	A1	Address 1
118	A3	A3	A3	A3	Address 3
119	A5	A5	A5	A5	Address 5
120	A7	A7	A7	A7	Address 7
121	A9	A9	A9	A9	Address 9
122	A11	A11	A11	A11	Address 11
123	A13	A13	A13	A13	Address 13
124	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
125	NC	NC	NC	NC	No Connection
126	NC	NC	NC	NC	No Connection

Back, Right Side Signals

**168-Pin SDRAM DIMM PinOut**
Pin #	Non-Parity	Parity	72 ECC	80 ECC	Pin Description
127	VSS	VSS	VSS	VSS	Ground
128	NC	NC	NC	NC	No Connection
129	/RAS3	/RAS3	/RAS3	/RAS3	Column Address Strobe 3
130	/CAS6	/CAS6	/CAS6	/CAS6	Column Address Strobe 6
131	/CAS7	/CAS7	/CAS7	/CAS7	Column Address Strobe 7
132	NC	NC	NC	NC	No Connection
133	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
134	NC	NC	NC	CB14	Parity/Check Bit Input/Output 14
135	NC	NC	NC	CB15	Parity/Check Bit Input/Output 15
136	NC	CB6	CB6	CB6	Parity/Check Bit Input/Output 6
137	NC	CB7	CB7	CB7	Parity/Check Bit Input/Output 7
138	VSS	VSS	VSS	VSS	Ground
139	DQ48	DQ48	DQ48	DQ48	Data 48
140	DQ49	DQ49	DQ49	DQ49	Data 49
141	DQ50	DQ50	DQ50	DQ50	Data 50
142	DQ51	DQ51	DQ51	DQ51	Data 51
143	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
144	DQ52	DQ52	DQ52	DQ52	Data 52
145	NC	NC	NC	NC	Not connected
146	NC	NC	NC	NC	No Connection
147	NC	NC	NC	NC	Not connected
148	VSS	VSS	VSS	VSS	Ground
149	DQ53	DQ53	DQ53	DQ53	Data 53
150	DQ54	DQ54	DQ54	DQ54	Data 54
151	DQ55	DQ55	DQ55	DQ55	Data 55
152	VSS	VSS	VSS	VSS	Ground
153	DQ56	DQ56	DQ56	DQ56	Data 56
154	DQ57	DQ57	DQ57	DQ57	Data 57
155	DQ58	DQ58	DQ58	DQ58	Data 58
156	DQ59	DQ59	DQ59	DQ59	Data 59
157	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC
158	DQ60	DQ60	DQ60	DQ60	Data 60
159	DQ61	DQ61	DQ61	DQ61	Data 61
160	DQ62	DQ62	DQ62	DQ62	Data 62
161	DQ63	DQ63	DQ63	DQ63	Data 63
162	VSS	VSS	VSS	VSS	Ground
163	CK3	CK3	CK3	CK3
164	NC	NC	NC	NC	Not connected
165	SA0	SA0	SA0	SA0	Serial Address 0
166	SA1	SA1	SA1	SA1	Serial Address 1
167	SA2	SA2	SA2	SA2	Serial Address 2
168	VCC	VCC	VCC	VCC	+5 VDC or +3.3 VDC

Data width is 64 bits per memory stick [the front side 84 pins are not connected together with the back side 84 pins]

The approximate board size. 5.375" x 1.375"

SIMM: Single Inline Memory Module
DRAM: Dynamic Random Access Memory
SO DIMM: Small Outline Dual Inline Memory Module
SDRAM:: Synchronous DRAM (Random Access Memory), Synchronous to Positive Clock Edge.
FPM:Fast Page Mode: (asynchronous) Obsolete, faster than normal DRAM, used in 386/486 computers.
EDO: Extended Data Out: (asynchronous) A superset of FPM, just faster than FPM.
All 168 pin DIMMs use either 66MHz SDRAM, PC100 SDRAM, PC133 SDRAM, EDO or FPM memory. 168 pin DIMMs have two alignment notches as shown.
The left most notch [keyway] determines the DRAM type. If the notch is centered then the memory module is Buffered DRAM [EDO or Fast Page]. If the notch is off-set to the right then the memory module is either a un-buffered DRAM/SDRAM DIMM or a buffered SDRAM DIMM. The center notch determines the voltage. If the notch is centered then the DIMM operates off 3.3 volts.

Back to the main Computer Memory Modules information page. For electronic device manufacturers see one of these pages:
Memory IC manufacturers
Memory Module manufacturers
Additional electronic Equipment manufacturers may be found by selecting the OEM Equipment icon below, or component manufacturers may be found by selecting the Components icon below.

Electronic Design Key words: 168 pin DRAM DIMM (Unbuffered) Pinout, Pin-Out, DIMM: Dual Inline Memory Module, Electrical Standard, DRAM: Dynamic Random Access Memory, Interface Standard, Specification, Spec, Electrical Interface, Semiconductor IC manufacturers, Physical Interface, Engineering Description, electrical characteristics, Pin descriptions, Component Manufacturers, Vendors, Signal Names, Out-dated interface


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