Cypress Part Replacements for Obsolete Simtek Parts – KBA83208

Version: **

 

Question:

What are the recommended replacements for Simtek parts that are obsolete?

 

Answer:

 

Simtek has obsolete several parts obsolete before Simtek was acquired by Cypress in 2008. There are no drop-in replacements for these parts.

The nearest part suggested by Simtek is the STK12C68 series, but using these devices requires minor changes in the layout of the application. Moreover, the STK12C68 series is in NRND (not recommended for new design) status. See the Application Notes attached with each series of Simtek devices for a summary of steps required for choosing the STK12C68 series devices.

Therefore, Cypress strongly recommends that you use the latest series of Cypress nvSRAMs such as CY14E256LA and redesign your boards.

                                                                                                                                                              
Original Simtek
    Series
Original Simtek PartsNear-Equivalent
    Simtek Series
More Information
STK10C48STK10C48-N25
    STK10C48-N25I
    STK10C48-N35
    STK10C48-N35I
    STK10C48-N45
    STK10C48-N45I
    STK10C48-NF25
    STK10C48-NF25I
    STK10C48-NF35
    STK10C48-NF35I
    STK10C48-NF45
    STK10C48-NF45I
    STK10C48-P25
    STK10C48-P25I
    STK10C48-P35
    STK10C48-P35I
    STK10C48-P45
    STK10C48-P45I
    STK10C48-PF25
    STK10C48-PF25I
    STK10C48-PF35
    STK10C48-PF35I
    STK10C48-PF45
    STK10C48-PF45I
    STK10C48-S25
    STK10C48-S25I
    STK10C48-S35
    STK10C48-S35I
    STK10C48-S45
    STK10C48-S45I
    STK10C48-SF25
    STK10C48-SF25I
    STK10C48-SF35
    STK10C48-SF35I
    STK10C48-SF45
    STK10C48-SF45I
STK12C68See the attached Simtek application note:    

Converting STK10C48 to STK12C68.pdf

  
STK10C68   

STK10C68-5C25
     STK10C68-5C25I
     STK10C68-5C25M
     STK10C68-5C35
     STK10C68-5C35I
     STK10C68-5C35M
     STK10C68-5C45
     STK10C68-5C45I
     STK10C68-5C45M
     STK10C68-5C55
     STK10C68-5C55I
     STK10C68-5C55M
     STK10C68-5CF25
     STK10C68-5CF25I
     STK10C68-5CF25M
     STK10C68-5CF35
     STK10C68-5CF35I
     STK10C68-5CF35M
     STK10C68-5CF45
     STK10C68-5CF45I
     STK10C68-5CF45M
     STK10C68-5CF55
     STK10C68-5CF55I
     STK10C68-5CF55M
     STK10C68-5K25
     STK10C68-5K25I
     STK10C68-5K25M
     STK10C68-5K35
     STK10C68-5K35I
     STK10C68-5K35M
     STK10C68-5K45
     STK10C68-5K45I
     STK10C68-5K45M
     STK10C68-5K55
     STK10C68-5K55I
     STK10C68-5K55M
     STK10C68-5KF25
     STK10C68-5KF25I
     STK10C68-5KF25M
     STK10C68-5KF35
     STK10C68-5KF35I
     STK10C68-5KF35M
     STK10C68-5KF45
     STK10C68-5KF45I
     STK10C68-5KF45M
     STK10C68-5KF55
     STK10C68-5KF55I
     STK10C68-5KF55M
     STK10C68-5L25
     STK10C68-5L25I
     STK10C68-5L25M
     STK10C68-5L35
     STK10C68-5L35I
     STK10C68-5L35M
     STK10C68-5L45
     STK10C68-5L45I
     STK10C68-5L45M
     STK10C68-5L55
     STK10C68-5L55I
     STK10C68-5L55M
     STK10C68-5LF25
     STK10C68-5LF25I
     STK10C68-5LF25M
     STK10C68-5LF35
     STK10C68-5LF35I
     STK10C68-5LF35M
     STK10C68-5LF45
     STK10C68-5LF45I
     STK10C68-5LF45M
     STK10C68-5LF55
     STK10C68-5LF55I
     STK10C68-5LF55M
     STK10C68-5P25
     STK10C68-5P25I
     STK10C68-5P25M
     STK10C68-5P35
     STK10C68-5P35I
     STK10C68-5P35M
     STK10C68-5P45
     STK10C68-5P45I
     STK10C68-5P45M
     STK10C68-5P55
     STK10C68-5P55I
     STK10C68-5P55M
     STK10C68-5PF25
     STK10C68-5PF25I
     STK10C68-5PF25M
     STK10C68-5PF35
     STK10C68-5PF35I
     STK10C68-5PF35M
     STK10C68-5PF45
     STK10C68-5PF45I
     STK10C68-5PF45M
     STK10C68-5PF55
     STK10C68-5PF55I
     STK10C68-5PF55M
     STK10C68-5S25
     STK10C68-5S25I
     STK10C68-5S25M
     STK10C68-5S35
     STK10C68-5S35I
     STK10C68-5S35M
     STK10C68-5S45
     STK10C68-5S45I
     STK10C68-5S45M
     STK10C68-5S55
     STK10C68-5S55I
     STK10C68-5S55M
     STK10C68-5SF25
     STK10C68-5SF25I
     STK10C68-5SF25M
     STK10C68-5SF35
     STK10C68-5SF35I
     STK10C68-5SF35M
     STK10C68-5SF45
     STK10C68-5SF45I
     STK10C68-5SF45M
     STK10C68-5SF55
     STK10C68-5SF55I
     STK10C68-5SF55M
     STK10C68-C25
     STK10C68-C25I
     STK10C68-C25M
     STK10C68-C35
     STK10C68-C35I
     STK10C68-C35M
     STK10C68-C45
     STK10C68-C45I
     STK10C68-C45M
     STK10C68-C55
     STK10C68-C55I
     STK10C68-C55M
     STK10C68-CF25
     STK10C68-CF25I
     STK10C68-CF25M
     STK10C68-CF35
     STK10C68-CF35I
     STK10C68-CF35M
     STK10C68-CF45
     STK10C68-CF45I
     STK10C68-CF45M
     STK10C68-CF55
     STK10C68-CF55I
     STK10C68-CF55M
     STK10C68-K25
     STK10C68-K25I
     STK10C68-K25M
     STK10C68-K35
     STK10C68-K35I
     STK10C68-K35M
     STK10C68-K45
     STK10C68-K45I
     STK10C68-K45M
     STK10C68-K55
     STK10C68-K55I
     STK10C68-K55M
     STK10C68-KF25
     STK10C68-KF25I
     STK10C68-KF25M
     STK10C68-KF35
     STK10C68-KF35I
     STK10C68-KF35M
     STK10C68-KF45
     STK10C68-KF45I
     STK10C68-KF45M
     STK10C68-KF55
     STK10C68-KF55I
     STK10C68-KF55M
     STK10C68-L25
     STK10C68-L25I
     STK10C68-L25M
     STK10C68-L35
     STK10C68-L35I
     STK10C68-L35M
     STK10C68-L45
     STK10C68-L45I
     STK10C68-L45M
     STK10C68-L55
     STK10C68-L55I
     STK10C68-L55M
     STK10C68-LF25
     STK10C68-LF25I
     STK10C68-LF25M
     STK10C68-LF35
     STK10C68-LF35I
     STK10C68-LF35M
     STK10C68-LF45
     STK10C68-LF45I
     STK10C68-LF45M
     STK10C68-LF55
     STK10C68-LF55I
     STK10C68-LF55M
     STK10C68-P25
     STK10C68-P25I
     STK10C68-P25M
     STK10C68-P35
     STK10C68-P35I
     STK10C68-P35M
     STK10C68-P45
     STK10C68-P45I
     STK10C68-P45M
     STK10C68-P55
     STK10C68-P55I
     STK10C68-P55M
     STK10C68-PF25
     STK10C68-PF25I
     STK10C68-PF25M
     STK10C68-PF35
     STK10C68-PF35I
     STK10C68-PF35M
     STK10C68-PF45
     STK10C68-PF45I
     STK10C68-PF45M
     STK10C68-PF55
     STK10C68-PF55I
     STK10C68-PF55M
     STK10C68-S25
     STK10C68-S25I
     STK10C68-S25M
     STK10C68-S35
     STK10C68-S35I
     STK10C68-S35M
     STK10C68-S45
     STK10C68-S45I
     STK10C68-S45M
     STK10C68-S55
     STK10C68-S55I
     STK10C68-S55M
     STK10C68-SF25
     STK10C68-SF25I
     STK10C68-SF25M
     STK10C68-SF35
     STK10C68-SF35I
     STK10C68-SF35M
     STK10C68-SF45
     STK10C68-SF45I
     STK10C68-SF45M
     STK10C68-SF55
     STK10C68-SF55I
     STK10C68-SF55M

  
STK12C68See the attached Simtek application note:    

Converting STK10C68 to STK12C68.pdf

  
STK11C48STK11C48-N25
    STK11C48-N35
    STK11C48-N35I
    STK11C48-N45
    STK11C48-N45I
    STK11C48-NF25
    STK11C48-NF25I
    STK11C48-NF35
    STK11C48-NF35I
    STK11C48-NF45
    STK11C48-NF45I
    STK11C48-P25
    STK11C48-P25I
    STK11C48-P35
    STK11C48-P35I
    STK11C48-P45
    STK11C48-P45I
    STK11C48-PF25
    STK11C48-PF25I
    STK11C48-PF35
    STK11C48-PF35I
    STK11C48-PF45
    STK11C48-PF45I
    STK11C48-S25
    STK11C48-S25I
    STK11C48-S35
    STK11C48-S35I
    STK11C48-S45
    STK11C48-S45I
    STK11C48-SF25
    STK11C48-SF25I
    STK11C48-SF35
    STK11C48-SF35I
    STK11C48-SF45
    STK11C48-SF45I
STK12C68See the attached Simtek application note:    

Converting STK11C48 to STK12C68.pdf

  
STK15C68STK15C68-NF25
    STK15C68-NF25I
    STK15C68-NF25ITR
    STK15C68-NF25TR
    STK15C68-NF45
    STK15C68-NF45I
    STK15C68-NF45ITR
    STK15C68-NF45TR
    STK15C68-PF25
    STK15C68-PF25I
    STK15C68-PF35
    STK15C68-PF35I
    STK15C68-PF45
    STK15C68-PF45I
    STK15C68-SF25
    STK15C68-SF25
    STK15C68-SF25I
    STK15C68-SF25I
    STK15C68-SF25ITR
    STK15C68-SF25TR
    STK15C68-SF35
    STK15C68-SF35I
    STK15C68-SF45
    STK15C68-SF45
    STK15C68-SF45I
    STK15C68-SF45I
    STK15C68-SF45ITR
    STK15C68-SF45TR
    STK15C68-WF25
    STK15C68-WF35
    STK15C68-WF35I
    STK15C68-WF45
    STK15C68-WF45I
STK12C68See the attached Simtek application note:    

Converting STK15C68 to STK12C68.pdf

  
STK20C04STK20C04-W25
    STK20C04-W25I
    STK20C04-W30
    STK20C04-W30I
    STK20C04-W35
    STK20C04-W35I
    STK20C04-W45
    STK20C04-W45I
    STK20C04-WF25
    STK20C04-WF25I
    STK20C04-WF35
    STK20C04-WF35I
    STK20C04-WF45
    STK20C04-WF45I
STK12C68See the attached Simtek application note:    

Converting STK20C04 to STK12C68.pdf

  
STK25C48STK25C48-W
    STK25C48-W20
    STK25C48-W20I
    STK25C48-W25
    STK25C48-W25I
    STK25C48-W35
    STK25C48-W35I
    STK25C48-W45
    STK25C48-W45I
STK12C68See the attached Simtek application note:    

Converting STK25C48 to STK12C68.pdf