component
AT25256B-SSHL-T
Public Unreviewedby Ray
Microchip EEPROM, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownAT25256B-SSHL-T
Microchip · EEPROM · SOIC-8
AT25256B-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 | Chip Select (active low). Enables the device when driven low; the device enters standby when high. All SPI transactions are framed by CS. |
| 2 | SO | output | Serial Data Output. Data is shifted out on the falling edge of SCK (SPI mode 0). High-Z when CS is high. Output capacitance ~8pF. |
| 3 | WP | input | Write Protect (active low). When low, disables writes to the status register (hardware data protection). Can be tied to VCC if unused. |
| 4 | GND | power_in | Ground reference for the device. |
| 5 | SI | input | Serial Data Input. Data (opcodes, addresses, and data to be written) is shifted in on the rising edge of SCK (SPI mode 0). |
| 6 | SCK | input | Serial Data Clock. Provides the timing reference for serial input and output. Max 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 | Hold (active low). Suspends serial communication without resetting the serial sequence when driven low with CS low. Tie to VCC if unused. |
| 8 | VCC | power_in | Positive supply voltage. Operating range 1.8V to 5.5V. Supply current up to 10mA at 20MHz read, standby current 2-5µA typical. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip |
| Package | SOIC-8 |
| Category | Memory |
| Pins | 8 |
Ordering variants
AT25256B-SSHL-T
CAD (KiCad official)
- Symbol:
AT25256B-SSHL-T - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
at25256b-sshl-t.step |
122 KB | You want the bare part, or you mark your own boards. |
at25256b-sshl-t-etched.step |
2.7 MB | You want the part with AT25256B-SSHL-T already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 670 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: 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).