2N3055 NPN Power Transistor

@@ -0,0 +1,46 @@+# 2N3055++**STMicroelectronics** · Bipolar Transistor (BJT) · TO-3++The 2N3055 is a classic NPN power transistor rated for 60 V and 15 A continuous collector current in a metal TO-3 package. It has been a standard pass transistor in linear power supplies and an output device in audio amplifiers for decades. The TO-3 case is the collector, with base and emitter on the two pins.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | B | input | Base of NPN power transistor. Drives collector current via hFE (typ. 20-70 at IC = 4 A, VCE = 4 V). VBE ≈ 1.8 V at IC = 4 A. Absolute max IB = 7 A, VEBO = 7 V. |+| 2 | E | passive | Emitter of NPN power transistor. Common return for base-drive and collector current. For NPN 2N3055 normally tied to circuit ground / lower-voltage rail. |+| 3 | C | passive | Collector of NPN power transistor, electrically connected to the TO-3 metal case/mounting tab for heat-sinking. Rated VCBO = 100 V, VCEO = 60 V, IC = 15 A. Must be isolated from grounded heatsinks with a mica/insulator pad. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | NPN power transistor |+| Collector-emitter voltage (VCEO) | 60 V |+| Collector current (IC) | 15 A continuous |+| DC current gain (hFE) | 20 to 70 at 4 A |+| Transition frequency (fT) | 2.5 MHz |+| Power dissipation | 115 W |+| Package | TO-3 (case = collector) |+| Operating temperature | -65 C to 200 C |++## Ordering variants++- `2N3055`++## CAD (KiCad official)++- Symbol: `2n3055.kicad_sym`+- Footprint: `2n3055.kicad_mod`+- 3D model: Metal TO-3 body from KiCad `Package_TO_SOT_THT/TO-3`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/2n3055.pdf) (7 pp, sha256 `c957a8b217de71e5`, 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/2n3055-datasheet.pdf)

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