MC1403BM from HGSEMI, in a SOIC-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	Vin	power_in	Positive supply input. Accepts 4.5 V to 40 V (absolute maximum 40 V). Quiescent current is typically 1.2 mA.
2	Vout	power_out	Regulated 2.5 V ±25 mV band-gap reference output. Can source up to 10 mA of load current. External output capacitance should not exceed 1.0 µF to preserve stability.
3	GND	power_in	Device ground reference. All Vin and Vout voltages are measured with respect to this pin.
4	NC	unconnected	No internal connection. Leave floating or tie to GND.
5	NC	unconnected	No internal connection. Leave floating or tie to GND.
6	NC	unconnected	No internal connection. Leave floating or tie to GND.
7	NC	unconnected	No internal connection. Leave floating or tie to GND.
8	NC	unconnected	No internal connection. Leave floating or tie to GND.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

MC1403BM/TR
MC1403M/TR
MC1403BN
MC1403N
MC1403BMM/TR
MC1403MM/TR
MC1403BM6/TR
MC1403M6/TR

CAD (KiCad official)

Symbol: MC1403BM
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mc1403bm.step`	122 KB	You want the bare part, or you mark your own boards.
`mc1403bm-etched.step`	1.8 MB	You want the part with `MC1403BM` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 456 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: HGSEMI datasheet (10 pp, sha256 f29adc846d291084, 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