BL24C256A-PARC from BL Shanghai Belling, 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. Hardwired to VCC or GND to select one of eight device addresses on the I2C bus. Internal proprietary bias pulls the pin to a logic low if left floating.
2	A1	input	Device address input bit 1. Hardwired to VCC or GND to select one of eight device addresses on the I2C bus. Internal proprietary bias pulls the pin to a logic low if left floating.
3	A2	input	Device address input bit 2. Hardwired to VCC or GND to select one of eight device addresses on the I2C bus. Internal proprietary bias pulls the pin to a logic low if left floating.
4	GND	power_in	Ground reference for the device.
5	SDA	bidirectional	I2C serial data line. Open-drain bidirectional pin for serial data transfer; requires an external pull-up resistor to VCC. May be wire-ORed with other open-drain devices on the bus.
6	SCL	input	I2C serial clock input. Data is clocked into the EEPROM on the positive edge and clocked out on the negative edge. Supports up to 1 MHz at VCC >= 2.5 V (400 kHz at 1.7-2.5 V).
7	WP	input	Write Protect. Tie to GND for normal read/write operation. When tied to VCC, the entire 256 Kbit memory array becomes write-protected (hardware data protection).
8	VCC	power_in	Positive supply voltage, 1.7 V to 5.5 V (2.5 V to 5.5 V for full 1 MHz operation). Typical read current 0.14 mA, write current 0.28 mA at VCC=5.0 V/400 kHz.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOP-8
Category	Memory
Pins	8

Ordering variants

BL24C256A-PARC
BL24C256A-PARCPARS
BL24C256A-PARCPATC
BL24C256A-PARCPATS
BL24C256A-PARCDARS
BL24C256A-PARCDATS
BL24C256A-PARCDARC
BL24C256A-PARCDATC
BL24C256A-PARCSFRS
BL24C256A-PARCSFTS
BL24C256A-PARCSFRC
BL24C256A-PARCSFTC
BL24C256A-PARCNTRS
BL24C256A-PARCNTTS
BL24C256A-PARCNTRC
BL24C256A-PARCNTTC

CAD (KiCad official)

Symbol: BL24C256A-PARC
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
`bl24c256a-parc.step`	122 KB	You want the bare part, or you mark your own boards.
`bl24c256a-parc-etched.step`	2.6 MB	You want the part with `BL24C256A-PARC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 651 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: BL Shanghai Belling datasheet (16 pp, sha256 5909eda557ab1e85, 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