The Cypress CY7C138-25JC is a 32Kbit dual-port asynchronous SRAM organized as 4K×8, with a 25 ns access time and a parallel memory interface. It operates from a 4.5 V to 5.5 V supply within the commercial temperature range of 0 °C to 70 °C. Housed in a 68-pin PLCC (J-lead) surface-mount package, this part is designed for systems requiring two independent ports to access a shared memory array without bus-turnaround dead cycles — common in multiprocessor buffers, DSP-to-host mailboxes, and FIFO replacement in legacy telecom or industrial controller cards.
Cypress CY7C138-25JC Dual-Port SRAM, 32Kbit, 25 ns
MPNCY7C138-25JC
Obsolete
Cypress CY7C138-25JC, 32Kbit dual-port asynchronous SRAM, 25 ns access, 4.5–5.5 V supply, 4K×8 organization, 68-PLCC (J-lead) surface-mount, 0–70 °C commercial temp.
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Memory type | Volatile |
| Mounting | Surface Mount |
| Supply voltage | 4.5V ~ 5.5V |
| Memory interface | Parallel |
| Operating temperature | 0°C ~ 70°C (TA) |
| Package | Tube |
| Technology | SRAM - Dual Port, Asynchronous |
| Access time | 25 ns |
| Memory size | 32Kbit |
| Memory format | SRAM |
| Case | 68-LCC (J-Lead) |
| Memory organization | 4K x 8 |
| Write cycle time - word, page | 25ns |
Product details
Frequently asked questions
Is CY7C138-25JC obsolete?
Yes, the CY7C138-25JC is officially obsolete. No last-time-buy window remains, and no direct production replacement is available. It must be sourced through independent surplus and broker channels.
What is the operating temperature range of CY7C138-25JC?
The CY7C138-25JC is rated for commercial temperature operation from 0 °C to 70 °C. It is not suitable for industrial or automotive environments outside this range.