25AA040/25LC040/25C040 is a serial electrically erasable programmable read-only memory produced by Microchip Technology Inc., with the characteristics of low power consumption, erasability, programmability and readability.
The 25AA040/25LC040/25C040 family are 4‑Kbit SPI serial EEPROMs offering low‑power CMOS technology. They are available in PDIP, SOIC, and TSSOP packages and support industrial and automotive temperature ranges.
Key features include a 512 × 8‑bit memory organization, 16‑byte page size, typical write current of 3 mA, read current of 500 pA, standby current of 500 nA, endurance of 1 M cycles, and data retention of over 200 years.
| Memory organization | 512 × 8‑bit |
|---|---|
| Page size | 16 bytes |
| Write current (typical) | 3 mA |
| Read current (typical) | 500 pA |
| Standby current (typical) | 500 nA |
| Endurance | 1 M cycles |
| Data retention | > 200 years |
| Supply voltage (25AA040) | 1.8 V – 5.5 V |
The write cycle time is up to 5 ms max.
Up to 16 bytes can be sent before a write cycle is required.
The device is rated for 1 million write/erase cycles.