ZD24C256A-SSGMB from Zetta, 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	A0	input	Device Address Input bit 0. Hardware slave-address bit used to select the device on a shared 2-wire bus; tie directly to VCC or GND. Corresponds to bit 1 of the I2C device address byte.
2	A1	input	Device Address Input bit 1. Hardware slave-address bit used to select the device on a shared 2-wire bus; tie directly to VCC or GND. Corresponds to bit 2 of the I2C device address byte.
3	A2	input	Device Address Input bit 2. Hardware slave-address bit used to select the device on a shared 2-wire bus; tie directly to VCC or GND. Corresponds to bit 3 of the I2C device address byte.
4	GND	power_in	Ground reference for the power supply. Connect to the system ground.
5	SDA	bidirectional	Serial Data. Open-drain bidirectional I/O for the I2C bus; requires an external pull-up (<=10 kOhm) to VCC. Can be wire-ORed with other open-drain devices on the same bus.
6	SCL	input	Serial Clock input from the bus master. Input data on SDA is latched on the rising edge of SCL and output data changes on the falling edge. Must be driven high or pulled high with an external pull-up when the bus is idle.
7	WP	input	Write Protect. Active high: tie to GND for normal write operations; tie to VCC to inhibit all writes to the memory array. Internally pulled down (weakly) to GND when floating; datasheet recommends driving to a known state.
8	VCC	power_in	Device power supply, 1.7V to 5.5V (2.5V to 5.5V required for 1MHz Fast Mode Plus). Operation outside the specified VCC range may produce spurious results.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

ZD24C256A-SSGMB

CAD (KiCad official)

Symbol: ZD24C256A-SSGMB
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: Zetta datasheet (26 pp, sha256 18ebc71abd08daef, 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