The Cypress CY7C1399B-15VC is a 256Kbit asynchronous SRAM organized as 32K words by 8 bits. It delivers a 15 ns access time from a 3.0 V to 3.6 V supply, and comes in a 28-SOJ surface-mount package. This part was designed for cache or buffer memory in embedded systems, telecom line cards, and networking equipment where a fast, byte-wide scratchpad was needed — think late-90s router control planes or printer controller buffers.
Cypress CY7C1399B-15VC 256Kbit Async SRAM, 15 ns, 28-SOJ
MPNCY7C1399B-15VC
Obsolete
Cypress CY7C1399B-15VC, 256Kbit (32K × 8) asynchronous SRAM, 15 ns access, 3.0–3.6 V supply, 0–70 °C, 28-SOJ surface-mount package, tube.
$1.0633Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Memory type | Volatile |
| Mounting | Surface Mount |
| Supply voltage | 3V ~ 3.6V |
| Memory interface | Parallel |
| Operating temperature | 0°C ~ 70°C (TA) |
| Package | Tube |
| Technology | SRAM - Asynchronous |
| Access time | 15 ns |
| Memory size | 256Kbit |
| Memory format | SRAM |
| Case | 28-BSOJ (0.300\", 7.62mm Width) |
| Memory organization | 32K x 8 |
| Write cycle time - word, page | 15ns |
Product details
Frequently asked questions
Who supplies CY7C1399B-15VC and how is it quoted?
We supply the CY7C1399B-15VC through independent distribution. It is quoted to order against an RFQ — availability and current pricing are confirmed at quote time, not listed here.
What is the closest pin-compatible alternative to CY7C1399B-15VC?
A pin-compatible alternative in the same family is the CY7C1399BN-15VC, which has the same 256Kbit organization, 15 ns access, and 28-SOJ footprint. Verify the exact pinout and timing with the datasheet before substituting.
What package does CY7C1399B-15VC come in?
The CY7C1399B-15VC comes in a 28-SOJ surface-mount package (0.300" body width, 7.62 mm), shipped in tubes.