The Microchip Technology Inc. 25AA256/25LC256 (25XX256*) are 256k-bit Serial Electrically Erasable PROMs.
The 25AA256/25LC256 devices are 256‑kilobit Serial EEPROMs that communicate via a standard SPI bus. They support a 10 MHz clock, low‑power operation, and offer both industrial and automotive temperature ranges.
The handbook provides electrical and AC characteristics, functional description, instruction set, timing diagrams, and package options, along with detailed specifications for designers and engineers.
| Memory organization | 32,768 × 8‑bit |
|---|---|
| Page size | 64 bytes |
| Maximum clock frequency | 10 MHz |
| Write current (5.5 V, 10 MHz) | 5 mA |
| Read current (5.5 V, 10 MHz) | 5 mA |
| Standby current (5.5 V) | 1 pA |
| Endurance | 1,000,000 erase/write cycles |
| Data retention | > 200 years |
| ESD protection | > 4000 V |
| Operating temperature (Industrial) | -40 °C to +85 °C |
| Operating temperature (Automotive) | -40 °C to +125 °C |
| Supply voltage (25AA256) | 1.8 V to 5.5 V |
| Supply voltage (25LC256) | 2.5 V to 5.5 V |
The devices support a maximum clock frequency of 10 MHz.
Up to 64 bytes can be written in a single page write, provided all bytes are within the same page.
The standby current is 1 pA at 5.5 V.
Industrial range is –40 °C to +85 °C and automotive range is –40 °C to +125 °C.