BL78L05D from BL Shanghai Belling, in a SOT-89-3. 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	OUT	power_out	Regulated +5V output. Typical 5.0V (min 4.8V, max 5.2V) at Io = 1mA-70mA over 7V ≤ Vi ≤ Vmax. Maximum continuous output current 100mA. Requires ≥0.1µF ceramic bypass to GND close to the pin for stability.
2	GND	power_in	Ground/common reference for the regulator. Tie to system ground plane; internally connected to pins 3, 6, and 7 in the SOP8 package.
3	GND	power_in	Ground/common reference (internally tied to pins 2, 6, 7). Additional GND pins improve thermal dissipation via the PCB.
4	NC	unconnected	No internal connection. Leave floating or tie to GND; do not use as a signal node.
5	NC	unconnected	No internal connection. Leave floating or tie to GND; do not use as a signal node.
6	GND	power_in	Ground/common reference (internally tied to pins 2, 3, 7). Additional GND pins improve thermal dissipation via the PCB.
7	GND	power_in	Ground/common reference (internally tied to pins 2, 3, 6). Additional GND pins improve thermal dissipation via the PCB.
8	IN	power_in	Unregulated DC input. Absolute maximum 35V; recommended operating range approximately 7V to 20V (must be at least Vout + ~1.7V dropout). Requires ≥0.33µF bypass capacitor close to the pin for input stability.

Key specifications

Parameter	Value
Manufacturer	BL Shanghai Belling
Package	SOT-89-3
Category	PMIC
Pins	8

Ordering variants

BL78L05DD

CAD (KiCad official)

Symbol: BL78L05D
Footprint: Package_TO_SOT_SMD:SOT-89-3
3D model: SOT-89-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bl78l05d.step`	57 KB	You want the bare part, or you mark your own boards.
`bl78l05d-etched.step`	1.2 MB	You want the part with `BL78L05D` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 320 faces against 42 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 (3 pp, sha256 158a1318d4cdbd85, 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