BL24CM1A-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	NC	unconnected	No internal connection. Leave floating or tie to GND for best noise immunity.
2	A1	input	Device address input bit 1. Hard-wired to VCC or GND to select one of up to four BL24CM1A devices on the same I2C bus. Internally biased to logic low if left floating (proprietary internal bias).
3	A2	input	Device address input bit 2. Hard-wired to VCC or GND to select one of up to four BL24CM1A devices on the same I2C bus. Internally biased to logic low if left floating.
4	GND	power_in	Ground reference for supply and all logic signals.
5	SDA	bidirectional	I2C serial data. Bidirectional, open-drain; requires an external pull-up resistor to VCC. May be wire-ORed with other open-drain/open-collector devices on the same bus.
6	SCL	input	I2C serial clock input, up to 400 kHz at VCC >= 2.0 V. Positive edge clocks data into the EEPROM; negative edge clocks data out. Schmitt-trigger, filtered input.
7	WP	input	Hardware write-protect input. Tie to GND for normal read/write operation; tie to VCC to write-protect the full 1024K array (see Table 2). Schmitt-trigger, filtered input.
8	VCC	power_in	Positive supply, single-supply operation down to 2.0 V (up to 400 kHz at 2.0 V). Decouple to GND with a 100 nF ceramic capacitor placed close to the pin.

Key specifications

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

Ordering variants

BL24CM1A-PARC

CAD (KiCad official)

Symbol: BL24CM1A-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
`bl24cm1a-parc.step`	122 KB	You want the bare part, or you mark your own boards.
`bl24cm1a-parc-etched.step`	2.2 MB	You want the part with `BL24CM1A-PARC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 559 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 (20 pp, sha256 90c054d62d989bfb, 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