component

AT24C128M

Public Made by Adom

by adom

HGSEMI EEPROM, SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs at24c128m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
at24c128m-etched.fit.json at24c128m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
at24c128m-etched.glb at24c128m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
at24c128m-etched.step at24c128m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
at24c128m.glb Publish 0.1.0 · Ray 1mo ago
at24c128m.kicad_mod Publish 0.1.0 · Ray 1mo ago
at24c128m.kicad_sym Publish 0.1.0 · Ray 1mo ago
at24c128m.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect and oval pad as a SQUARE EAGLE smd; this carries the real pad shape across (0 -> 8 rounded pads) and stops dropping geometry drawn on KiCad User.N layers. Attributes, connects, pads and the pin-1 marker are gated against decreasing and are unchanged. · Ray 1mo ago
at24c128m.step Publish 0.1.0 · Ray 1mo ago
package.json Publish 0.2.0 · Ray 1mo ago
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 1mo ago
page.json Brief states the pinout check that actually ran (was an unconditional "Datasheet-verified pinout") · Ray 12d ago
README.md at24c128m: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 18d ago

AT24C128M

HGSEMI · EEPROM · SOP-8

AT24C128M from HGSEMI, in a SOP-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 bit A0 input. Hardware address pin used with E1/E2 to select one of eight devices on the same I2C bus. Internally pulled down to Vss if left floating.
2 E1 input Slave address bit A1 input. Hardware address pin used with E0/E2 to select one of eight devices on the same I2C bus. Internally pulled down to Vss if left floating.
3 E2 input Slave address bit A2 input. Hardware address pin used with E0/E1 to select one of eight devices on the same I2C bus. Internally pulled down to Vss if left floating.
4 Vss power_in Ground reference for Vcc supply. 0 V rail.
5 SDA bidirectional I2C serial data (open-drain). Bidirectional data line for read/write transfers; requires an external pull-up resistor to Vcc (typ. 1.3 kΩ at 2.5-5.5 V, 10 kΩ at 1.7 V). Can be wire-OR'd with other open-drain devices.
6 SCL input I2C serial clock input. Positive edge clocks data in on SDA; negative edge clocks data out. Supports up to 400 kHz (Vcc ≥ 1.7 V) or 1 MHz (Vcc ≥ 1.7 V per AC characteristics).
7 WCB input Write Control input (active-low write enable). Tie to Vss to allow normal 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 Positive supply voltage. Operating range 1.7 V to 5.5 V. Read Icc typ. 0.2 mA and write Icc typ. 0.8 mA at 400 kHz.

Key specifications

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

Ordering variants

  • AT24C128MN
  • AT24C128MM/TR
  • AT24C128MMM/TR
  • AT24C128MMT/TR
  • AT24C128MDQ2/TR
  • AT24C128MDQ3/TR
  • AT24C128MM5/TR

CAD (KiCad official)

  • Symbol: AT24C128M
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: at24c128m-etched.step / at24c128m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at24c128m.step / at24c128m.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
at24c128m.step 122 KB You want the bare part, or you mark your own boards.
at24c128m-etched.step 1.8 MB You want the part with AT24C128M already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 460 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

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