CAT24C256WI-GT3 EEPROM Chip for Avalon 1346 Hashboard repair

CAT24C256WI-GT3 256-Kb I²C Serial EEPROM Chip | Calibration Data Storage Replacement IC for Avalon 1346 Hashboard Repair

The CAT24C256WI-GT3 is a 256-Kb serial EEPROM chip used as the hashboard calibration data storage on Avalonminer 1346 hashboards. Without a valid EEPROM, the control board cannot enumerate the hashboard's identity, hashrate bin, or calibration parameters — the miner reports the board as missing regardless of chip and power stage health. Drop-in replacement when the EEPROM is corrupted or physically damaged.

Internally organised as 32,768 words of 8 bits each. Supports standard, fast, and fast-plus I²C protocols for flexible communication with the Avalon AUC3 controller. Wide supply voltage range of 1.8V to 5.5V matches the Avalon 1346 hashboard local rail. 64-byte page write buffer enables fast EEPROM image flashing during repair workflow — flashing a known-good donor image takes seconds, not minutes. Hardware write protection safeguards stored data once the calibration is locked in.

When to Replace the CAT24C256WI-GT3

• Avalon 1346 hashboard reports as missing in the AUC3 controller — EEPROM data unreadable.
• Hashboard random reset after boot — corrupted EEPROM partially valid, causing inconsistent enumeration.
• Visible damage on the EEPROM package — burn marks, lifted pins, surge damage.
• Post-fault recovery workflow — replace EEPROM and reflash from a known-good donor board image.
• Refurbishment — preventive EEPROM swap on used Avalon 1346 hashboards during a complete rebuild.

CAT24C256WI-GT3 Specifications

FAQ — CAT24C256WI-GT3 EEPROM

Q: Can I just swap the chip and the hashboard works again?
A: Not always — a fresh blank EEPROM doesn't contain the hashboard's calibration data. After installing, reflash from a known-good donor board image using an I²C programmer connected to SCL/SDA pins. For repair shops with multiple identical Avalon 1346 boards in service, this is a routine 15-minute job.

Q: What's the difference between this and the EEPROM on Antminer hashboards?
A: Functionally similar (both store calibration data), but the address space, I²C protocol speed, and specific firmware structure differ between vendors. Don't try to use Antminer EEPROM images on Avalon boards or vice versa — use the right donor image for the right hashboard generation.

Q: How do I diagnose EEPROM failure vs other hashboard faults?
A: Connect to the Avalon AUC3 via Raspberry Pi + estats command. If estats returns no module info or returns corrupted data for one specific hashboard while the other two read normally, the EEPROM is the prime suspect. Probe the SDA/SCL lines with a scope — should show clean I²C traffic during enumeration.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Reel and tape quantities are stocked.

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Repair shops stocking CAT24C256 EEPROMs by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.