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AT24C128MM

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by Ray

HGSEMI EEPROM, MSOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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AT24C128MM

HGSEMI · EEPROM · MSOP-8

AT24C128MM from HGSEMI, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 E0 input Slave address input bit 0. Combined with E1/E2 to select one of up to 8 devices on the same I2C bus. Internally pulled down to Vss if left floating.
2 E1 input Slave address input bit 1. Hardware-selectable device address bit; internally pulled down to Vss if left floating.
3 E2 input Slave address input bit 2. Hardware-selectable device address bit; internally pulled down to Vss if left floating.
4 Vss power_in Ground reference for the Vcc supply.
5 SDA bidirectional I2C serial data (bidirectional, open-drain). Requires an external pull-up resistor to Vcc. Input capacitance approx. 8 pF.
6 SCL input I2C serial clock input. Positive-edge clocks data in, negative-edge clocks data out. Supports up to 400 kHz (1.7V) or 1 MHz (higher Vcc).
7 WCB input Write Control input, active low. Tie to Vss to allow write operations; tie to Vcc to inhibit all writes to the memory array. Internally pulled down to Vss if left floating.
8 VCC power_in Supply voltage input, 1.7V to 5.5V. Typical read current 0.2 mA and write current 0.8 mA at 400 kHz.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package MSOP-8
Category Memory
Pins 8

Ordering variants

  • AT24C128MM/TR
  • AT24C128MMN
  • AT24C128MMM/TR
  • AT24C128MMMT/TR
  • AT24C128MMDQ2/TR
  • AT24C128MMDQ3/TR
  • AT24C128MMM5/TR

CAD (KiCad official)

  • Symbol: AT24C128MM
  • Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
  • 3D model: MSOP-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: HGSEMI datasheet (19 pp, sha256 ade6fc1683c10678, retrieved 2026-08-17, tier: lcsc)
  • 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