BD140 PNP Power Transistor

@@ -0,0 +1,47 @@+# BD140++**STMicroelectronics** · Bipolar Transistor (BJT) · TO-126++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](https://www.st.com/resource/en/datasheet/bd140.pdf) (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](docs/bd140-datasheet.pdf)

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