The AT24C256 is a 256-Kbit (32,768 x 8) I2C-compatible serial EEPROM operating from 1.7V to 5.5V. It delivers larger non-volatile storage for data logging, configuration, and asset-tracking in embedded systems.
Product Overview
The AT24C256 extends the proven AT24Cxx I2C EEPROM family to 256 Kbits, organized as 32,768 words of 8 bits. Its two-wire interface keeps pin count and routing minimal while providing ample space for event logs, calibration tables, and serial identification.
With broad voltage support and an industry-standard footprint, the AT24C256 integrates easily with microcontrollers and is commonly used as a drop-in equivalent across multiple manufacturers for higher-density I2C EEPROM requirements.
Key Features
- – 256-Kbit (32,768 x 8) I2C serial EEPROM density
- – 2-wire I2C (TWI) serial interface
- – Wide supply voltage: 1.7V – 5.5V (verify specific grade)
- – Clock speed: up to 400 kHz / 1 MHz (verify grade)
- – 64-byte page write buffer
- – Low-power standby and active current
- – Hardware write protection option
- – Multiple device addressing on a single bus
Technical Specifications
| Parameter | Specification |
|---|---|
| Density | 256 Kbit (32,768 x 8) |
| Interface | I2C (2-wire) |
| Supply Voltage | 1.7V – 5.5V (verify specific grade with manufacturer datasheet) |
| Clock Frequency | 400 kHz / 1 MHz (verify grade) |
| Page Size | 64 bytes |
| Write Cycles | 1,000,000 (typical, verify with datasheet) |
| Data Retention | 100 years (typical, verify with datasheet) |
| Package | SOIC-8 / TSSOP-8 (verify ordering code with manufacturer datasheet) |
| Operating Temperature | -40°C to +85°C (verify grade) |
| Compliance | RoHS / REACH (verify with manufacturer datasheet) |
Applications
– Industrial boards and data logging
– System configuration and calibration tables
– Asset identification and serial tracking
– Embedded systems and sensor hubs
– Consumer and medical devices
Why Choose Newfly Electronics
– Verified sourcing from ISO9001-certified manufacturers
– MOQ flexibility with small-quantity and prototype sourcing support
– Alternative-part and cross-reference service for the AT24Cxx family
– Full-board BOM sourcing to consolidate your component purchasing
– RoHS / REACH documentation support for compliance filing
FAQ
Q: Is AT24C256 a drop-in for smaller AT24Cxx parts?
A: Pinout is generally compatible within the family, but density, voltage grade, and package should be confirmed against the specific datasheet before substitution.
Q: What is the page-write size?
A: The AT24C256 features a 64-byte page-write buffer; structure your writes to align with the page boundary for reliable operation.
Q: Can you supply documentation for compliance?
A: Yes. We provide RoHS / REACH documentation support for your filing needs.
