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AT24C128C-SSHM-B

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Microchip Tech Pre-ordered Chips, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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AT24C128C-SSHM-B

Microchip Tech · Pre-ordered Chips · SOIC-8

AT24C128C-SSHM-B from Microchip Tech, in a SOIC-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 hard-wired to GND or VCC (up to eight devices per bus); internally pulled down to GND if left floating, but should be tied to a known state.
2 A1 input Device address input hard-wired to GND or VCC (up to eight devices per bus); internally pulled down to GND if left floating, but should be tied to a known state.
3 A2 input Device address input hard-wired to GND or VCC (up to eight devices per bus); internally pulled down to GND if left floating, but should be tied to a known state.
4 GND power_in Ground reference for the power supply, to be connected to system ground.
5 SDA bidirectional Open-drain bidirectional serial data pin that needs an external pull-up resistor not exceeding 10 kΩ and may be wire-ORed with other open-drain devices on the bus.
6 SCL input Serial clock input; commands and input data are latched on the rising edge and output data is clocked out on the falling edge, and it must be forced high or pulled high when the bus is idle.
7 WP input Write-protect input; connected to GND allows normal writes, connected to VCC inhibits all writes to the protected memory (full array), and internally pulled down to GND if floating.
8 VCC power_in Device power supply, 1.7V to 5.5V for Grade 3 and 2.5V to 5.5V for Grade 1; operation at invalid VCC voltages may produce spurious results.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SOIC-8
Category Interface ICs
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 Grade 1 VCC1 2.5 5.5 V Grade 1 9
Supply voltage Grade 3 VCC2 1.7 5.5 V Grade 3 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 ISB 0.1 3 μA VCC = 1.7V, VIN = VCC or GND 9
Standby current ISB 1.6 4 μA VCC = 2.5V, VIN = VCC or GND 9
Standby current ISB 4 6 μA VCC = 5.0V, VIN = VCC or GND 9
Input leakage current ILI 0.1 3 μA VIN = VCC or GND 9
Output leakage current ILO 0.05 3 μA VOUT = VCC or GND 10
Input low level VIL -0.6 0 V Max is VCC x 0.3; Note 2 10
Input high level VIH 0 0 V Min is VCC x 0.7, max is VCC + 0.5; Note 2 10
Output low level VOL1 0.2 V VCC = 1.7V, IOL = 0.15 mA 10
Output low level VOL2 0.4 V VCC = 2.5V, IOL = 2.1 mA 10
Clock frequency, SCL (400 kHz column) fSCL 400 kHz 10
Clock pulse width low (400 kHz column) tLOW 1200 ns 10
Clock pulse width high (400 kHz column) tHIGH 600 ns 10
Noise suppression time (400 kHz column) tI 50 ns Note 2 10
Clock low to data out valid (400 kHz column) tAA 100 900 ns 10
Bus free time between stop and start (400 kHz column) tBUF 1200 ns 10
Start hold time (400 kHz column) tHD.STA 600 ns 10
Start set-up time (400 kHz column) tSU.STA 600 ns 10
Data in hold time (400 kHz column) tHD.DAT 0 ns 10
Data in set-up time (400 kHz column) tSU.DAT 100 ns 10
Inputs rise time (400 kHz column) tR 300 ns Note 3 10
Inputs fall time (400 kHz column) tF 300 ns Note 3 10
Stop set-up time (400 kHz column) tSU.STO 600 ns 10
Data out hold time (400 kHz column) tDH 50 ns 10
Write cycle time tWR 5 ms 10
Time required after VCC stable before accepting commands tPUP 100 µs 11
Power-on reset threshold voltage VPOR 1.5 V 11
Minimum time at VCC = 0V between power cycles tPOFF 500 ms 11
Input/output capacitance (SDA) CI/O 8 pF VI/O = 0V 12
Input capacitance (A0, A1, A2 and SCL) CIN 6 pF VIN = 0V 12
Write endurance 1e+06 Write Cycles TA = 25°C, VCC = 5.0V, Page Write mode 12
Data retention 100 Years TA = 55°C 12
Operating temperature (case) Grade 1 -40 125 °C Automotive Grade 1 9
Operating temperature (case) Grade 3 -40 85 °C Automotive Grade 3 9
VCC power supply Grade 1 VCC 2.5 5.5 V Automotive Grade 1 9
VCC power supply Grade 3 VCC 1.7 5.5 V Automotive Grade 3 9
Temperature under bias -55 125 °C 9
Storage temperature -65 150 °C 9
Supply voltage VCC 6.25 V 9
Voltage on any pin with respect to ground -1 7 V 9
DC output current 5 mA 9
ESD protection AT24C128C 3 kV >3 kV 9

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin 8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] © 2020 Microchip Technology Inc. 25

CAD (KiCad official)

  • Symbol: AT24C128C-SSHM-B
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: at24c128c-sshm-b-etched.step / at24c128c-sshm-b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); at24c128c-sshm-b.step / at24c128c-sshm-b.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (38 pp, sha256 246bfb745ffa84e6, retrieved 2026-10-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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