AT45DB021E-SSHN-T from Dialog Semiconductor Adesto Adesto Technologies, 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	SI	input	Serial Input. Shifts command, address, and data into the device. Data on SI is latched on the rising edge of SCK. Ignored while CS is deasserted.
2	SCK	input	Serial Clock. Provides the clock reference to the device; controls data flow to/from the chip. Command, address, and input data are latched on the rising edge; output data on SO is clocked out on the falling edge.
3	RESET	input	Active-low hardware reset. Terminates the in-progress operation and forces the state machine to idle while held low. Device incorporates an internal power-on reset, so this pin has no power-up restrictions; drive high externally if unused.
4	CS	input	Active-low Chip Select. Asserting CS selects the device; deasserting places the device in standby (not Deep Power-Down) and drives SO to high-impedance. A high-to-low transition starts an operation, a low-to-high transition ends it.
5	WP	input	Active-low Write Protect. When asserted, protects sectors specified in the Sector Protection Register from program/erase and prevents modification of the Sector Protection Register. Internally pulled high; may be left floating but tying to VCC is recommended when unused.
6	VCC	power_in	Device power supply, 1.65V to 3.6V. Operations outside this range are not recommended.
7	GND	power_in	Ground reference for the power supply; connect to system ground.
8	SO	output	Serial Output. Data is clocked out on the falling edge of SCK. High-impedance when the device is deselected (CS high).

Key specifications

Parameter	Value
Manufacturer	Dialog Semiconductor Adesto Adesto Technologies
Package	SOIC-8
Category	Memory
Pins	8

Ordering variants

AT45DB021E-SSHN-T
AT45DB021E-SSHN-TSSHN-B
AT45DB021E-SSHN-TMHN
AT45DB021E-SSHN-TCN

CAD (KiCad official)

Symbol: AT45DB021E-SSHN-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: Dialog Semiconductor Adesto Adesto Technologies datasheet (68 pp, sha256 db6fabc37825965c, 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