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Examples of 4164 class RAM chips

64K by 1 bit, in a particular pin configuration ('pinout').
64K by 1 bit = 65,536 bits

Note that some makers did not use "4164" in their part number.  That is because makers did not need to adhere to a common naming standard.  Some makers may have even purposely not used 4164 to avoid possible litigation action.

DIP packages (of plastic and ceramic) listed only - LCC and SIP packages are omitted.

Japanese makers tend not to print prefixes on ICs and transistors.  In photos below, it is seen that at least Mitsubishi, NEC, and Oki are in that category for the 4164.

The CMOS version of the 4164 class appears to be the 5164 class.


Pin 1 use

On the majority of 4164 type chips, pin 1 is unused - data sheets indicate that the pin is "N.C." (Not Connected).  See here.
Pin 1 on the remaining chips is used to allow selection of additional refresh modes (MCM6664A data sheet below indicates 'automatic' and 'self-refresh').

Refresh Cycles

Two types.
    • 256cycle/4ms: Refreshes to rows 0 through 255, within a 4 millisecond limit, will result in all 65,536 cells (bits) being refreshed.
    • 128cycle/2ms: Refreshes to rows 0 through 127, within a 2 millisecond limit, will result in all 65,536 cells (bits) being refreshed.

Some computer systems may specify chips of the 128 cycles type only.  Presumably, that is because the system's refresh circuitry only counts as high as row 127.  Placing 256cycle/4ms chips in such a system would fail because rows 128 to 255 in those chips would not be refreshed.  More information is at here.

The '256cycle/4ms' chips will have a cell matrix of 256 rows by 256 columns.  The '128cycle/2ms' chips will have a cell matrix of 128 rows by 512 columns.  For more information, see the 'Rectangular cell matrices' section of here.



IMPORTANT:  The table below does not show all of the chip's characteristics/specifications (that is what a data sheet is for).
Apart from major differences (such as access time), there can be differences (some subtle) that result in a particular 4164 chip not being suitable for your purpose.
Sometimes, a device maker will produce a list of RAM chips known to be compatible with their device (example).


Make Part Number Access
Time		 NMOS/
CMOS		 Pin 1
Use		 Refresh
Cycles		 Photo Source Source Source Data Sheet   Comment
AMD AM9064-10 100 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet  
AMD AM9064-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet  
AMD AM9064-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2   datasheet  
AMD AM9064-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2      
                       
Fairchild F4164-1 120 ns NMOS N.C. 256cycle/4ms   4164 list 1 4164 list 3   datasheet Datasheet suggests ceramic package only.
Fairchild F4164-2 150 ns NMOS N.C. 256cycle/4ms   4164 list 1 4164 list 3   datasheet Datasheet suggests ceramic package only.
Fairchild F4164-3 200 ns NMOS N.C. 256cycle/4ms   4164 list 1 4164 list 3   datasheet Datasheet suggests ceramic package only.
                       
Fujitsu       MB8264-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2 4164 list 3 datasheet  
Fujitsu       MB8264-20 200 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2 4164 list 3 datasheet  
Fujitsu       MB8264A-10 100 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet Datasheet indicates: P suffix for plastic, Z suffix for ceramic
Fujitsu       MB8264A-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet Datasheet indicates: P suffix for plastic, Z suffix for ceramic
Fujitsu       MB8264A-15 150 ns NMOS N.C. 128cycle/2ms photo       datasheet Datasheet indicates: P suffix for plastic, Z suffix for ceramic
                       
Fujitsu       MB8265-15 150 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4   datasheet 65
Fujitsu       MB8265-20 200 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4   datasheet 65
Fujitsu       MB8265A-10 100 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4   datasheet 65
Fujitsu       MB8265A-12 120 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4   datasheet 65
Fujitsu       MB8265A-15 150 ns NMOS REF 128cycle/2ms         datasheet 65
                       
Fujitsu       MB8266A-10 100 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4     66          See note 1.
Fujitsu       MB8266A-12 120 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4     66          See note 1.
                       
Hitachi       HM4864-2       150 ns NMOS N.C. 128cycle/2ms     4164 list 3   datasheet Ceramic case.
Hitachi       HM4864-3       200 ns NMOS N.C. 128cycle/2ms     4164 list 3   datasheet Ceramic case.
Hitachi       HM4864A-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     Ceramic case.
Hitachi       HM4864A-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     Ceramic case.
Hitachi       HM4864A-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     Ceramic case.
Hitachi       HM4864AP-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     Plastic case.
Hitachi       HM4864AP-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 3     Plastic case.
Hitachi       HM4864AP-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     Plastic case.
Hitachi       HM4864P-2 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2   datasheet Plastic case.
Hitachi       HM4864P-3 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2   datasheet Plastic case.
                       
Hitachi HM4865AP-12 120 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4     Plastic case.
Hitachi HM4865AP-15 150 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4     Plastic case.
Hitachi HM4865AP-20 200 ns NMOS REF 128cycle/2ms   4164 list 1 4164 list 4     Plastic case.
                       
IBM 2164-20 200 ns NMOS ? ? photo         Seen fitted on an IBM 5160 motherboard.
                       
Inmos IMS2600P-10 100 ns NMOS N.C. 256cycle/4ms   4164 list 1     datasheet Plastic case.
Inmos IMS2600P-12 120 ns NMOS N.C. 256cycle/4ms   4164 list 1     datasheet Plastic case.
Inmos IMS2600P-15 150 ns NMOS N.C. 256cycle/4ms photo 4164 list 1     datasheet Plastic case.
                       
Intel 2164-5 150 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Intel 2164-6 200 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Intel C2164-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Intel C2164-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Intel C2164-25 250 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Intel C2164A-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet  
Intel C2164A-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet  
Intel P2164A-15 150 ns NMOS N.C. 128cycle/2ms     4164 list 2   datasheet  
Intel P2164A-20 200 ns NMOS N.C. 128cycle/2ms     4164 list 2   datasheet  
Intel P2164B-12 120 ns NMOS N.C. 128cycle/2ms photo       datasheet Plastic case.
Intel P2164B-15 150 ns NMOS N.C. 128cycle/2ms         datasheet Plastic case.
                       
Micron MT4264-10 100 ns NMOS N.C. 256cycle/4ms   4164 list 1     datasheet Datasheet indicates an additional marking of 'C' for the ceramic version.
Micron MT4264-12 120 ns NMOS N.C. 256cycle/4ms   4164 list 1     datasheet Datasheet indicates an additional marking of 'C' for the ceramic version.
Micron MT4264-15 150 ns NMOS N.C. 256cycle/4ms photo 4164 list 1     datasheet Datasheet indicates an additional marking of 'C' for the ceramic version.
Micron MT4264-20 200 ns NMOS N.C. 256cycle/4ms   4164 list 1     datasheet Datasheet indicates an additional marking of 'C' for the ceramic version.
Micron MT4264N-2 150 ns NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Micron MT4264N-3 200 ns NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
                       
Mitsubishi     M5K4164ANP-10 100 ns NMOS N.C. ?   4164 list 3        
Mitsubishi     M5K4164ANP-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 3     datasheet  
Mitsubishi     M5K4164ANP-15 150 ns NMOS N.C. 128cycle/2ms photo       datasheet Photo is of a unit within an IBM 5160
Mitsubishi     M5K4164ANP-20 150 ns NMOS N.C. 128cycle/2ms photo       datasheet As shown in photo, the prefix of "M" is not printed on the chip.
Mitsubishi     M5K4164AP-10 100 ns NMOS REF ?       4164 list 4    
Mitsubishi     M5K4164AP-12 120 ns NMOS REF ?       4164 list 4    
Mitsubishi     M5K4164AP-15 150 ns NMOS REF ?       4164 list 4    
Mitsubishi     M5K4164NP-15 150 ns NMOS N.C. ?   4164 list 2 4164 list 3     Plastic case.
Mitsubishi     M5K4164NP-20 200 ns NMOS N.C. ?   4164 list 2 4164 list 3     Plastic case.
Mitsubishi     M5K4164NS-15 150 ns NMOS N.C. ?   4164 list 2 4164 list 3     Ceramic case.
Mitsubishi     M5K4164NS-20 200 ns NMOS N.C. ?   4164 list 2 4164 list 3     Ceramic case.
Mitsubishi     M5K4164P-15 150 ns NMOS REF ?       4164 list 4   Plastic case.
Mitsubishi     M5K4164P-20 200 ns NMOS REF 128cycle/2ms   4164 list 1   4164 list 4   Plastic case.
Mitsubishi     M5K4164S-15 150 ns NMOS REF 128cycle/2ms   4164 list 1   4164 list 4   Ceramic case.
Mitsubishi     M5K4164S-20 200 ns NMOS REF 128cycle/2ms   4164 list 1   4164 list 4   Ceramic case.
                       
Mitsubishi     M5M4164NP-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3     See note 1
Mitsubishi     M5M4164NS-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1      
Mitsubishi     M5M4164P-12 120 ns NMOS REF 128cycle/2ms   4164 list 1   4164 list 4  
                       
Mostek MK4164J-12 120 ns NMOS REF ?       4164 list 4   Ceramic case.
Mostek MK4164N-12 120 ns NMOS REF 128cycle/2ms   4164 list 1   4164 list 4   Plastic case.     See note 1.
                       
Mostek MK4564J-12 120 ns NMOS N.C. 128cycle/2ms         datasheet Ceramic case.
Mostek MK4564J-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet Ceramic case.
Mostek MK4564J-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet Ceramic case.
Mostek MK4564J-25 250 ns NMOS N.C. 128cycle/2ms   4164 list 1       Ceramic case.
Mostek MK4564N-12 120 ns NMOS N.C. 128cycle/2ms         datasheet Plastic case.
Mostek MK4564N-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2   datasheet Plastic case.
Mostek MK4564N-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2   datasheet Plastic case.
Mostek MK4564N-25 250 ns NMOS N.C. 128cycle/2ms   4164 list 1       Plastic case.
                       
Motorola     MCM6664-15 150 ns NMOS REF ?     4164 list 4      
Motorola     MCM6664-20 200 ns NMOS REF ?     4164 list 4      
Motorola     MCM6664AL-12 120 ns NMOS REF 128cycle/2ms   4164 list 1     datasheet Ceramic case.
Motorola     MCM6664AL-15 150 ns NMOS REF 128cycle/2ms   4164 list 1     datasheet Ceramic case.
Motorola     MCM6664AL-20 200 ns NMOS REF 128cycle/2ms         datasheet Ceramic case.
Motorola     MCM6664AP-12 120 ns NMOS REF 128cycle/2ms         datasheet Plastic case.
Motorola     MCM6664AP-15 150 ns NMOS REF 128cycle/2ms         datasheet Plastic case.
Motorola     MCM6664AP-20 200 ns NMOS REF 128cycle/2ms         datasheet Plastic case.
Motorola     MCM6664L15 150 ns NMOS REF ?   4164 list 1      
Motorola     MCM6664L20 200 ns NMOS REF ?   4164 list 1      
Motorola     MCM6664L25 250 ns NMOS REF ?   4164 list 1      
                       
Motorola     MCM6665-15 150 ns NMOS N.C. ?     4164 list 3      
Motorola     MCM6665-20 200 ns NMOS N.C. ?     4164 list 3      
Motorola     MCM6665AL-15 150 ns NMOS REF 128cycle/2ms   4164 list 1        
Motorola     MCM6665AL-20 200 ns NMOS REF 128cycle/2ms   4164 list 1        
Motorola     MCM6665AP15 150 ns NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Motorola     MCM6665AP20 200 ns NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Motorola     MCM6665BP15 150 ns NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Motorola     MCM6665BP20 200 ns NMOS ? ? photo   4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Motorola     MCM6665L15 150 ns NMOS REF ?   4164 list 1        
Motorola     MCM6665L20 200 ns NMOS REF ?   4164 list 1        
Motorola     MCM6665L25 250 ns NMOS REF ?   4164 list 1 4164 list 3     See note 1
                       
National Semiconductor NMC3764-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3      
National Semiconductor NMC3764-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3      
National Semiconductor NMC3764-20 200 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 3      
                       
National Semiconductor NMC4164-1 120 ns NMOS N.C. 256cycle/4ms   4164 list 1 4164 list 3     Probable error in list #3: "NSC4164" should be "NMC4164"
National Semiconductor NMC4164-2 150 ns NMOS N.C. 256cycle/4ms   4164 list 1 4164 list 3     Probable error in list #3: "NSC4164" should be "NMC4164"
                       
NEC     µPD4164C-1 250 ns NMOS N.C. ?       4164 list 3   Plastic case.
NEC     µPD4164C-2 200 ns NMOS N.C. ? photo   4164 list 2 4164 list 3   Plastic case.   Photo is of a unit within a late IBM 5150
NEC     µPD4164C-3 150 ns NMOS N.C. ?      4164 list 2 4164 list 3   Plastic case.
NEC     µPD4164C-10 100 ns NMOS N.C. 128cycle/2ms         datasheet Plastic case.
NEC     µPD4164C-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet Plastic case.
NEC     µPD4164C-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1   4164 list 3 datasheet Plastic case.
NEC     µPD4164C-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3 datasheet Plastic case.
NEC     µPD4164D-1 250 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
NEC     µPD4164D-2 200 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
NEC     µPD4164D-3 150 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
NEC     µPD4164D-12 120 ns NMOS N.C. 128cycle/2ms       4164 list 3 datasheet Ceramic case.
NEC     µPD4164D-15 150 ns NMOS N.C. 128cycle/2ms       4164 list 3 datasheet Ceramic case.
NEC     µPD4164D-20 200 ns NMOS N.C. 128cycle/2ms       4164 list 3 datasheet Ceramic case.
                       
Oki     MSM3764-2 ? NMOS ? ?     4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Oki     MSM3764-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3    
Oki     MSM3764-15 150 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2 4164 list 3    
Oki     MSM3764-20 200 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2 4164 list 3   As shown in photo, the prefix of "MS" is not printed on the chip.
Oki     MSM3764A-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet  
Oki     MSM3764A-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1     datasheet As shown in photo, the prefix of "MS" is not printed on the chip.
Oki     MSM3764A-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1        
                       
Panasonic / Matsushita MN4164P-10 100 ns NMOS N.C. 128cycle/2ms   4164 list 1        
Panasonic / Matsushita MN4164P-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3      
Panasonic /Matsushita MN4164P-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 3   datasheet Plastic case. Datasheet indicates that MN4164-15 is the ceramic version.
Panasonic / Matsushita MN4164P-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 3   datasheet Plastic case. Datasheet indicates that MN4164-20 is the ceramic version.
Panasonic / Matsushita MN4164P-25 250 ns NMOS N.C. 128cycle/2ms     4164 list 3   datasheet Plastic case. Datasheet indicates that MN4164-25 is the ceramic version.
                       
Samsung KM4164B-10 100 ns NMOS N.C. 128cycle/2ms     4164 list 3   datasheet Datasheet indicates plastic case.
Samsung KM4164B-12 120 ns NMOS N.C. 128cycle/2ms photo   4164 list 3   datasheet Datasheet indicates plastic case.
Samsung KM4164B-15 150 ns NMOS N.C. 128cycle/2ms     4164 list 3   datasheet Datasheet indicates plastic case.
                       
Sanyo LM3364-15 150 ns NMOS ? ? photo 4164 list 1       Pin 1 use unknown.
Sanyo LM3364-20 200 ns NMOS ? ?   4164 list 1       Pin 1 use unknown.
                       
Sharp LH2164-12 120 ns ? ? ?           Seen pictured on Internet
Sharp LH2164-15 150 ns ? ? ? photo         Found on a working card mixed with µPD4164C-3
Sharp LH2164-20 200 ns ? ? ?           Seen pictured on Internet
                       
Siemens HYB4164 ? ? ? ? photo          
Siemens HYB4164-1 120 ns NMOS N.C. 256cycle/4ms         datasheet Datasheet indicates plastic case.
Siemens HYB4164-2 150 ns NMOS N.C. 256cycle/4ms         datasheet Datasheet indicates plastic case.
Siemens HYB4164-3 200 ns NMOS N.C. 256cycle/4ms         datasheet Datasheet indicates plastic case.
Siemens 8493286 ? ? ? ? photo         Seen fitted to an IBM 5160 motherboard of type 64-256KB
                       
[Soviet Union] КP565РУ5 ? ? ? ? photo         Military version has no "К" prefix.  "P" after the "К" indicates plastic.        (KP565RU5)
                       
Texas Instruments SMJ4164-12 120 ns NMOS N.C. 256cycle/4ms       4164 list 3   Ceramic case.  SMJ=military
Texas Instruments SMJ4164-15 150 ns NMOS N.C. 256cycle/4ms       4164 list 3   Ceramic case.  SMJ=military
Texas Instruments SMJ4164-20 200 ns NMOS N.C. 256cycle/4ms       4164 list 3   Ceramic case.  SMJ=military
Texas Instruments TMS4164-12 120 ns NMOS N.C. 256cycle/4ms       4164 list 3 datasheet  
Texas Instruments TMS4164-15 150 ns NMOS N.C. 256cycle/4ms photo 4164 list 1 4164 list 2 4164 list 3 datasheet  
Texas Instruments TMS4164-20 200 ns NMOS N.C. 256cycle/4ms photo 4164 list 1 4164 list 2 4164 list 3 datasheet Photo is of a unit within a late IBM 5150
Texas Instruments TMS4164-25 250 ns NMOS N.C. 256cycle/4ms   4164 list 1   4164 list 3    
                       
Thomson MKB4564P-82 150 ns NMOS N.C. ?     4164 list 3     MKB=military         Thomson acquired Mostek in 1985
Thomson MKB4564P-83 200 ns NMOS N.C. ?     4164 list 3     MKB=military         Thomson acquired Mostek in 1985
                       
Toshiba     TMM4164C-3 150 ns NMOS N.C. 128cycle/2ms   4164 list 1   4164 list 3   Ceramic case.
Toshiba     TMM4164C-4 200 ns NMOS N.C. 128cycle/2ms photo 4164 list 1   4164 list 3   Ceramic case.
Toshiba     TMM4164P-2 120 ns NMOS ? 128cycle/2ms   4164 list 1       Pin 1 use unknown.
Toshiba     TMM4164P-3 150 ns NMOS ? 128cycle/2ms   4164 list 1 4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Toshiba     TMM4164P-4 200 ns NMOS ? 128cycle/2ms   4164 list 1 4164 list 2     Pin 1 use unknown, however, inclusion on list#2 suggests N.C.
Toshiba     TMM4164AP-12 120 ns NMOS N.C. 128cycle/2ms   4164 list 1     datasheet Plastic case.
Toshiba     TMM4164AP-15 150 ns NMOS N.C. 128cycle/2ms photo 4164 list 1 4164 list 2   datasheet Plastic case.
Toshiba     TMM4164AP-20 200 ns NMOS N.C. 128cycle/2ms   4164 list 1 4164 list 2   datasheet Plastic case.
                       
Toshiba     TMMS4164-20 200 ns NMOS ? ?     4164 list 2     Possible error in list #2: "TMMS" perhaps should be "TMM"




Note 1 In list #1, a blank field means unknown.
Therefore, the absence of "1PIN=REF" in the comment field must not be interpreted as 'Pin 1 = N.C.'