AT25320B-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 and frames each SPI command; must be pulled high between instructions. Drives the internal Mode Decode Logic.
2	SO	output	Serial Data Output. Shifts data out MSB-first on the falling edge of SCK during read operations. Output capacitance typ. 8pF.
3	WP	input	Write Protect (active low). When held low, prevents writes to the status register (hardware data protection). Should be tied high or driven high to allow status-register writes.
4	GND	power_in	Ground reference for supply and signal pins.
5	SI	input	Serial Data Input. Samples opcode, address and data bytes MSB-first on the rising edge of SCK.
6	SCK	input	Serial Clock. Clocks data in on SI on rising edges and out on SO on falling edges. Supports SPI Modes 0 and 3; up to 20MHz at 5V, 10MHz at 2.5V, 5MHz at 1.8V.
7	HOLD	input	Hold (active low). Pauses serial communication without deselecting or resetting the sequence; SO goes high-impedance and SI/SCK are ignored while low. Tie high when not used.
8	VCC	power_in	Positive supply voltage, 1.8V to 5.5V (absolute max 6.25V). Decouple locally to GND.

Key specifications

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

Ordering variants

AT25320B-SSHL-T

CAD (KiCad official)

Symbol: AT25320B-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
`at25320b-sshl-t.step`	122 KB	You want the bare part, or you mark your own boards.
`at25320b-sshl-t-etched.step`	2.8 MB	You want the part with `AT25320B-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: 685 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 (23 pp, sha256 6eb63f39b2e61b60, 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