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M24C64

Public Made by Adom

by adom

ST 64 Kbit (8 KB) I2C serial EEPROM, SO-8. 1 MHz bus, 3 address pins, write control, 1.7-5.5 V. Datasheet-verified.

componentmemoryeepromi2cnon-volatileso-8stmicroelectronics
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

M24C64

STMicroelectronics · 64 Kbit I2C EEPROM · SO-8

A 64 Kbit (8 KB) serial EEPROM with an I2C interface, in SO-8, ST's take on the ubiquitous 24-series EEPROM and a staple for storing settings, calibration, and small logs that survive power loss. It talks I2C at up to 1 MHz, writes in 32-byte pages, and rates over a million write/erase cycles with 200-year retention. Three chip-address pins (E0-E2) put up to eight on one bus, and a write-control pin (WC) hardware-protects the array against stray writes. It shares its pinout and command set with the 24LC64/AT24C64. Runs 1.7-5.5 V.

Pinout

Pin Name Type Function
1 E0 input Chip enable address input bit 0. Tied to VCC or VSS to set b1 of the 7-bit I2C device select code. Left floating reads as 0.
2 E1 input Chip enable address input bit 1. Tied to VCC or VSS to set b2 of the 7-bit I2C device select code. Left floating reads as 0.
3 E2 input Chip enable address input bit 2. Tied to VCC or VSS to set b3 of the 7-bit I2C device select code. Left floating reads as 0.
4 VSS power_in Ground reference for all signals, including VCC supply voltage.
5 SDA bidirectional I2C serial data. Open-drain bidirectional line for address, data and acknowledge transfers. Requires an external pull-up resistor to VCC.
6 SCL input I2C serial clock input. Strobes data in on SDA and clocks data out on SDA. Supports 100 kHz, 400 kHz, and 1 MHz bus speeds.
7 WC input Write control, active low. When driven high, all write operations to the memory array are disabled (device ACKs the device-select and address bytes but not data bytes). Low or floating enables writes.
8 VCC power_in Supply voltage. 1.7 V to 5.5 V for M24C64-F/DF (down to 1.6 V under restricting conditions), 1.8 V to 5.5 V for M24C64-R, 2.5 V to 5.5 V for M24C64-W. Recommend 10 nF to 100 nF decoupling to VSS close to the pin.

Key specifications

Parameter Value
Type Serial EEPROM (non-volatile)
Density 64 Kbit (8 KB)
Interface I2C up to 1 MHz
Write 32-byte page
Endurance 1,000,000+ cycles
Retention >200 years
Addressing E0-E2 (8 per bus) + WC protect
Supply voltage 1.7-5.5 V
Package SO-8

Ordering variants

Same part, different packaging or reel option.

  • M24C64-DFMN6TP (SO-8)
  • M24C64-RMN6TP (SO-8)

CAD (KiCad official)

  • Symbol: M24C64 (generated from datasheet; KiCad has no symbol)
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D)
  • 3D model files: m24c64-etched.step / m24c64-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); m24c64.step / m24c64.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (50 pp, sha256 c95123bad692fd89, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF