AT24C128B is a 131,072-bit serial electrically erasable and programmable read-only memory (EEPROM) organized as 16,384 words of 8 bits each. It has low-power and low-voltage operation features.
The AT24C128B is a 128‑Kbit (16,384 × 8) serial EEPROM that operates over a wide voltage range (1.8 V to 5.5 V) and is available in multiple 8‑lead packages such as PDIP, SOIC, TSSOP, and dBGA2. It supports up to eight devices on a common two‑wire bus and offers features like write‑protect, 64‑byte page writes, and a low‑power standby mode.
Key specifications include an operating temperature range of –55 °C to +125 °C, a write‑cycle time of 5 ms max, endurance of one million write cycles, and data retention of 40 years. Electrical characteristics such as supply current, input capacitance, and timing parameters are detailed for both 1 MHz and 400 kHz bus speeds.
| Supply voltage | 1.8 V to 5.5 V |
|---|---|
| Write cycle time | 5 ms max |
| Endurance | 1 000 000 write cycles |
| Data retention | 40 years |
| Maximum clock frequency | 1 MHz (5.5 V) / 400 kHz (1.8 V) |
| Input capacitance (SDA) | 8 pF |
The device operates from 1.8 V to 5.5 V.
It can endure up to one million write cycles.
The write cycle time is up to 5 ms.