AT25010B-SSHL-T from Microchip, in a SOP-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 chip select. Device is enabled when CS is low; when high, SO is high-impedance and SI is ignored. Every instruction must begin with a high-to-low CS transition.
2	SO	output	Serial Data Output. Data is shifted out MSB-first on the falling edge of SCK. Tri-stated (HI-Z) when the device is deselected or HOLD is asserted.
3	WP	input	Active-low hardware Write Protect. When held high, normal read/write operations proceed. When brought low, all write operations are inhibited; if brought low while CS is still low it will interrupt a pending write (unless the internal write cycle has already begun).
4	GND	power_in	Ground reference for all supply and signal pins.
5	SI	input	Serial Data Input. Opcodes, addresses, and write data are clocked in MSB-first on the rising edge of SCK.
6	SCK	input	Serial Data Clock. Master-driven SPI clock; supports SPI modes 0 (0,0) and 3 (1,1). Max 20 MHz at Vcc = 4.5-5.5 V, 10 MHz at 2.5-5.5 V, 5 MHz at 1.8-5.5 V.
7	HOLD	input	Active-low serial hold. Pauses serial communication with the master without resetting the sequence. Bringing HOLD low while SCK is low pauses the transfer and forces SO to HI-Z; returning HOLD high (with SCK low) resumes it.
8	VCC	power_in	Positive supply voltage. Operating range 1.8 V to 5.5 V; absolute max 6.25 V.

Key specifications

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

Ordering variants

AT25010B-SSHL-TSSHL-B
AT25010B-SSHL-T
AT25010B-SSHL-TXHL-B
AT25010B-SSHL-TXHL-T
AT25010B-SSHL-TMAHL-T
AT25010B-SSHL-TMEHL-T
AT25010B-SSHL-TCUL-T

CAD (KiCad official)

Symbol: AT25010B-SSHL-T
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`at25010b-sshl-t.step`	122 KB	You want the bare part, or you mark your own boards.
`at25010b-sshl-t-etched.step`	2.7 MB	You want the part with `AT25010B-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: 659 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 (27 pp, sha256 749d79a26a35f163, retrieved 2026-08-17, tier: lcsc)
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