BL24C04F-RRRC from BL Shanghai Belling, in a TSOT-23-5L. 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	SCL	input	I2C serial clock input. Positive edge clocks data into the EEPROM; negative edge clocks data out. Schmitt-trigger, filtered input for noise suppression; requires an external pull-up resistor (typ. 4.7 kohm to VCC).
2	GND	power_in	Ground / 0 V reference for the device.
3	SDA	bidirectional	I2C serial data line. Open-drain, bidirectional; may be wire-ORed with other open-drain/collector devices. Requires an external pull-up resistor to VCC (typ. 4.7 kohm).
4	VCC	power_in	Positive supply voltage. Single-supply operation across the device's rated VCC range (nominal 1.7-5.5 V for BL24C04F family).
5	WP	input	Write Protect. When tied to VCC the entire 4K array is write-protected; when tied to GND normal read/write operations are allowed. Do not leave floating.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	TSOT-23-5L
Category	Memory
Pins	5

Ordering variants

BL24C04F-RRRC
BL24C04F-RRRCRRRS
BL24C04F-RRRCTCRC
BL24C04F-RRRCTCRS
BL24C04F-RRRCDARC
BL24C04F-RRRCDARS
BL24C04F-RRRCPARC
BL24C04F-RRRCPARS
BL24C04F-RRRCSFRC
BL24C04F-RRRCSFRS
BL24C04F-RRRCNTRC
BL24C04F-RRRCNTRS

CAD (KiCad official)

Symbol: BL24C04F-RRRC
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: TSOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl24c04f-rrrc.step`	85 KB	You want the bare part, or you mark your own boards.
`bl24c04f-rrrc-etched.step`	2.3 MB	You want the part with `BL24C04F-RRRC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 565 faces against 102 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 (19 pp, sha256 5bddea927a0b005c, 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