BTS4141N from Infineon, in a SOT-223. 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	Switched high-side output to the load. Drain of the internal N-channel power FET; RON ≈ 200 mΩ, nominal load current ≥ 0.7 A, self-limited short-circuit current (~1.4 A typ, 2.1 A max initial peak). Actively clamped to ~63 V min. for inductive load switch-off.
2	GND	power_in	Logic (signal) ground reference for the internal control and protection circuitry. For load-dump and reverse-battery protection an external RGND ≈ 150 Ω resistor may be placed in series between this pin and system ground.
3	IN	input	CMOS-compatible logic input; drives the power switch on with a logic-high level (VIN(T+) ≤ 3.0 V turn-on, VIN(T-) ≥ 1.82 V turn-off, ~0.2 V hysteresis). Internal series resistor RI ≈ 3 kΩ; input clamped and ESD-protected, VIN range −10 V…Vbb.
4	Vbb	power_in	Positive battery supply (source of the internal N-FET). Operating range 12…45 V, absolute max 48 V, overvoltage clamp Vbb(AZ) = 47 V, load-dump withstand 83 V. Also acts as the tab / heat-sink pad on PG-SOT-223.

Key specifications

Parameter	Value
Manufacturer	Infineon
Package	SOT-223
Category	PMIC
Pins	4

CAD (KiCad official)

Symbol: BTS4141N
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`bts4141n.step`	64 KB	You want the bare part, or you mark your own boards.
`bts4141n-etched.step`	1.3 MB	You want the part with `BTS4141N` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 337 faces against 75 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: Infineon datasheet (21 pp, sha256 9e4935b2086ee127, 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