The BD140 is a PNP medium-power transistor rated for 80 V and 1.5 A continuous collector current in a TO-126 package. It is the complement of the NPN BD139, and the two are paired in class-AB audio output stages, complementary drivers, and general medium-power switching.

Pinout

Pin	Name	Type	Function
1	E	passive	Emitter of the PNP BJT. Typical VCE(sat) = -0.5 V at IC = -0.5 A, IB = -0.05 A; VBE approximately -1 V at IC = -0.5 A, VCE = -2 V.
2	C	passive	Collector of the PNP BJT. Also electrically bonded to the metal mounting tab of the SOT-32/TO-126 package. Absolute maximum VCEO = -80 V, VCBO = -80 V, IC = -1.5 A continuous, ICM = -3 A peak.
3	B	input	Base of the PNP BJT. Drives collector current via hFE (typ. 40..250 at IC = -150 mA, VCE = -2 V). Absolute maximum VEBO = -5 V, IB = -0.5 A.

Key specifications

Parameter	Value
Type	PNP medium-power transistor
Collector-emitter voltage (VCEO)	-80 V
Collector current (IC)	-1.5 A continuous (-3 A peak)
DC current gain (hFE)	40 to 250
Transition frequency (fT)	75 MHz
Power dissipation	12.5 W
Operating temperature	-55 C to 150 C

Ordering variants

BD140
BD140-10
BD140-16

CAD (KiCad official)

Symbol: bd140.kicad_sym
Footprint: bd140.kicad_mod
3D model: TO-126 body from KiCad Package_TO_SOT_THT/TO-126-3_Vertical.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STMicroelectronics datasheet (9 pp, sha256 9a72cdfa334700b8, retrieved 2026-08-17, tier: manufacturer)
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

BD140 PNP Power Transistor

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README

BD140

Pinout

Key specifications

Ordering variants

CAD (KiCad official)

Provenance