ZD24C128A-SSGMB from Zetta, 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	A0	input	Device Address Input bit 0. Sets the LSB of the hardware slave-address field of the I2C 7-bit device address, allowing up to eight devices on the same bus. Tie to VCC or GND.
2	A1	input	Device Address Input bit 1. Sets bit 1 of the hardware slave-address field of the I2C device address. Tie to VCC or GND.
3	A2	input	Device Address Input bit 2. Sets bit 2 of the hardware slave-address field of the I2C device address. Tie to VCC or GND.
4	GND	power_in	Ground reference for the power supply. Connect to the system ground.
5	SDA	bidirectional	I2C Serial Data. Open-drain bidirectional data line; requires an external pull-up to VCC (<= 10kΩ). May be wire-ORed with other open-drain devices on the same bus.
6	SCL	input	I2C Serial Clock input driven by the bus Master. SDA is latched on the rising edge and driven on the falling edge of SCL. Must be pulled high or driven high when the bus is idle.
7	WP	input	Write Protect. Tie to GND for normal write operation; tie to VCC to inhibit all writes to the memory array. Internally pulled down to GND if left unconnected (weak pull-down); Zetta 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 FM+ operation).

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

ZD24C128A-SSGMB

CAD (KiCad official)

Symbol: ZD24C128A-SSGMB
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
`zd24c128a-ssgmb.step`	122 KB	You want the bare part, or you mark your own boards.
`zd24c128a-ssgmb-etched.step`	3.0 MB	You want the part with `ZD24C128A-SSGMB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 727 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: Zetta datasheet (28 pp, sha256 09f06e678ee0a7d7, 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