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AT24LC128M

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by adom

HGSEMI EEPROM, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AT24LC128M

HGSEMI · EEPROM · SOP-8

AT24LC128M from HGSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 A0 input Device address input that is hardwired or left floating; if floating and board VCC-plane coupling is under 3 pF it is internally pulled down to GND, and if coupling exceeds 3 pF the datasheet recommends connecting it to GND.
2 A1 input Device address input that is hardwired or left floating; if floating and board VCC-plane coupling is under 3 pF it is internally pulled down to GND, and if coupling exceeds 3 pF the datasheet recommends connecting it to GND.
3 NC unconnected No connect pin.
4 GND power_in Ground reference for the device.
5 SDA bidirectional Open-drain bidirectional serial data pin for two-wire transfer that may be wire-ORed with other open-drain or open-collector devices and is normally pulled high by an external device.
6 SCL input Serial clock input where data is clocked into the EEPROM on the positive edge and clocked out on the negative edge.
7 WP input Write-protect input: connecting to GND allows normal write operations, while connecting to VCC inhibits all memory writes (full array protection); if floating and coupling is under 3 pF it is pulled down to GND, and above 3 pF the datasheet recommends connecting it to GND.
8 VCC power_in Power supply, specified from 1.8 V to 5.5 V.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply Voltage (range for VCC1 row) VCC1 1.8 5.5 V 9
Supply Voltage (range for VCC2 row) VCC2 2.5 5.5 V 9
Supply Voltage (range for VCC3 row) VCC3 2.7 5.5 V 9
Supply Voltage (range for VCC4 row) VCC4 4.5 5.5 V 9
Operating Ambient Temperature TA -40 85 ℃ Recommended operating range 9
DC Supply Voltage -0.3 6.5 V 8
Operating Ambient Temperature -40 85 ℃ 8
Storage Temperature -55 125 ℃ 8
Input Low Level VIL -0.6 V 9
Output Low Level (VCC = 5.0V) VOL3 0.4 V VCC =5.0V; IOL= 3.0 mA 9
Output Low Level (VCC = 3.0V) VOL2 0.4 V VCC =3.0V; IOL= 2.1 mA 9
Output Low Level (VCC = 1.8V) VOL1 0.2 V VCC =1.8V; IOL= 0.15 mA 9
Supply Current READ ICC1 0.4 1 mA VCC = 5.0V; READ at 400 kHz 9
Supply Current WRITE ICC2 2 3 mA VCC = 5.0V; WRITE at 400 kHz 9
Standby Current (VCC = 1.8V) ISB1 0.6 1 µA VCC = 1.8V; VIN= VCC or VSS 9
Standby Current (VCC = 2.5V) ISB2 1 2 µA VCC = 2.5V; VIN= VCC or VSS 9
Standby Current (VCC = 2.7V) ISB3 1 2 µA VCC = 2.7V; VIN= VCC or VSS 9
Standby Current (VCC = 5.0V) ISB4 1 3 µA VCC = 5.0V; VIN= VCC or VSS 9
Input Leakage Current ILI 0.1 3 µA VIN= VCC or VSS 9
Output Leakage Current ILO 0.05 3 µA VOUT = VCC or VSS 9
Input/Output Capacitance (SDA) CI/O 8 pF VI/O = 0V 9
Input Capacitance (A0, A1, A2, SCL) CIN 6 pF VIN = 0V 9
Clock Frequency, SCL fSCL 400 kHz 9
Clock Pulse Width Low tLOW 1.2 µs 9
Clock Pulse Width High tHIGH 0.6 µs 9
Noise Suppression Time tI 50 ns 9
Clock Low to Data Out Valid tAA 0.1 0.9 µs 10
Time the bus must be free before a new transmission can start tBUF 1.2 µs 10
Start Hold Time tHD.STA 0.6 µs 10
Start Setup Time tSU.STA 0.6 µs 10
Data In Hold Time tHD.DAT 0 µs 10
Data In Setup Time tSU.DAT 100 ns 10
Inputs Rise Time tR 0.3 µs 10
Inputs Fall Time tF 300 ns 10
Stop Setup Time tSU.STO 0.6 µs 10
Data Out Hold Time tDH 50 ns 10
Write Cycle Time tWR 5 ms 10

CAD (KiCad official)

  • Symbol: AT24LC128M
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)
  • 3D model files: at24lc128m-etched.step / at24lc128m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at24lc128m.step / at24lc128m.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (13 pp, sha256 4c0cd875d4ced8b2, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF