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

In order to keep this page at a reasonable size,
refer here for the pin out of Front side 168-pin DIMM pin out.
The pin out below related to the back or rear-side of a 168-pin DIMM.

Back, Left Side Signals

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

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.
Back to the main Computer Memory Modules information page. For electronic device manufacturers see one of these pages:
Memory IC manufacturers [individual IC's]
Memory Module manufacturers [memory sticks]
Memory Module Acronyms [Abbreviations used with memory sticks]
IC Memory Acronyms [abbreviations used with memory ICs]

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