Cypress (Infineon) CY7C109B-15ZC, 1Mbit asynchronous SRAM, 128K x 8 organization, 15 ns access time, 4.5V–5.5V supply, 32-TSOP-I surface-mount package, commercial 0°C–70°C temperature grade, bulk-packed.
| 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 | Bag |
| Technology | SRAM - Asynchronous |
| Access time | 15 ns |
| Memory size | 1Mbit |
| Memory format | SRAM |
| Case | 32-TFSOP (0.724\", 18.40mm Width) |
| Memory organization | 128K x 8 |
| Write cycle time - word, page | 15ns |
The CY7C109B-15ZC is a 1Mbit asynchronous SRAM organized 128K x 8 with 15 ns access time.
15 ns address-to-data valid.
That covers indoor office, lab, and telecom central-office environments. Not for unheated enclosures, engine bays, or outdoor cabinets. If the BOM calls for industrial or automotive temperature, this part does not fit — you would need the -15ZI variant (industrial) or a different family entirely.
No official pin-compatible second source or successor is listed in the available records. Any replacement would need to match the 32-TSOP I footprint, 5 V supply, 15 ns access time, and 128K x 8 organization.