BL2556ACB5TR from BL Shanghai Belling, in a SOT-23-5. 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	VOUT	power_out	Switched power output; connects to USB VBUS. Internally connected to VIN through the ~70mΩ high-side power MOSFET when the switch is enabled. Has an internal pull-down to discharge the output cap when the switch is off.
2	GND	power_in	Device ground reference.
3	RSET	passive	Current-limit threshold set pin. Connect an external resistor from RSET to GND to program the overcurrent threshold: Ioc = 60kΩ / Rset (typical range 1.7-2.3 A with Rset=30 kΩ). Place resistor as close as possible to the pin.
4	EN	input	Chip enable input. On the BL2556ACB5TR (A-suffix) variant this pin is ACTIVE-HIGH: drive above VIH (min 1.6 V) to enable, below VIL (max 0.4 V) to disable. Do not leave floating.
5	VIN	power_in	Main supply input, 2.7 V to 5.5 V (abs max 6 V). Bypass with a low-ESR ceramic capacitor (e.g. 4.7 µF) placed close to the pin. UVLO ~2.2 V rising.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-23-5
Category	Interface
Pins	5

Ordering variants

BL2556ACB5TR
BL2556ACB5TRCCB5TR

CAD (KiCad official)

Symbol: BL2556ACB5TR
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl2556acb5tr.step`	85 KB	You want the bare part, or you mark your own boards.
`bl2556acb5tr-etched.step`	2.4 MB	You want the part with `BL2556ACB5TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 568 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 (8 pp, sha256 4de4fa25247ef1f7, 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