BTS4140N 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	IN	input	Current-controlled input. Activates the power switch when connected to GND (pin1 grounded). On-state input current I_IN(on) ≈ 0.3 mA typ (1 mA max). Input resistance R_I ≈ 1 kΩ (0.5-2.5 kΩ). Max input current ±15 mA. ESD ±1 kV.
2	Vbb	power_in	Positive power supply voltage. Operating range V_bb(on) 4.9-60 V (typical automotive 12/24/42 V DC). Overvoltage protection V_bbin(AZ) 62 V. Internally tied to pin 4.
3	OUT	output	High-side switched output to the load. On-state resistance R_ON ≈ 1 Ω typ (1.5 Ω max @ 25 °C). Supports resistive, inductive and capacitive loads with output clamp V_ON(CL) ≥ 60 V during inductive switch-off.
4	Vbb	power_in	Positive power supply voltage (second Vbb pin, internally tied to pin 2 for improved current handling / thermal spreading via the SOT-223 tab).

Key specifications

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

CAD (KiCad official)

Symbol: BTS4140N
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
`bts4140n.step`	64 KB	You want the bare part, or you mark your own boards.
`bts4140n-etched.step`	1.4 MB	You want the part with `BTS4140N` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 367 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 (20 pp, sha256 e66c2404cd7d0caa, 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