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AT25128B-SSHL-T

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by Ray

Microchip EEPROM, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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README

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AT25128B-SSHL-T

Microchip · EEPROM · SOIC-8

AT25128B-SSHL-T from Microchip, in a SOIC-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 CS input Active-low SPI Chip Select. Pulling CS low selects the device and starts a serial transaction; the first byte after the falling edge is interpreted as the opcode. Bringing CS high ends the transaction and, for WRITE, triggers the internal programming cycle.
2 SO output SPI Serial Data Output (MISO). Data is shifted out on the falling edge of SCK, MSB first. The pin is high-impedance whenever CS is high or an invalid opcode is received.
3 WP input Active-low hardware Write Protect. When WP is low and the WPEN bit in the status register is 1, writes to the status register (including BP0/BP1) are inhibited, providing hardware write protection. Held high for normal read/write.
4 GND power_in Device ground reference for all supply and I/O signals.
5 SI input SPI Serial Data Input (MOSI). Opcodes, addresses and write data are shifted in on the rising edge of SCK, MSB first.
6 SCK input SPI Serial Clock input from the master. Supports SPI modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1). Maximum 20 MHz at VCC = 4.5-5.5V, 10 MHz at 2.5-5.5V, 5 MHz at 1.8-5.5V.
7 HOLD input Active-low Hold input. When taken low while SCK is low during a selected serial sequence, it pauses serial communication without resetting the transaction; SO becomes high-impedance and SI is ignored until HOLD is brought high again.
8 VCC power_in Positive supply voltage, 1.8V to 5.5V. Full 20 MHz SCK operation requires VCC ≥ 4.5V; standby current is <5 µA at 5V with CS = VCC.

Key specifications

Parameter Value
Manufacturer Microchip
Package SOIC-8
Category Memory
Pins 8

Ordering variants

  • AT25128B-SSHL-T
  • AT25128B-SSHL-TSSHL-B

CAD (KiCad official)

  • Symbol: AT25128B-SSHL-T
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Microchip datasheet (22 pp, sha256 327b6418a5554831, 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