2N3906

@@ -0,0 +1,47 @@+# 2N3906++**onsemi** · PNP BJT (general purpose) · TO-92++The 2N3906 is the standard general-purpose PNP bipolar transistor, the direct complement of the NPN 2N3904, in a TO-92 through-hole package. It switches and amplifies small signals up to about 200 mA and 40 V with a current gain (hFE) of roughly 100 to 300, so it handles high-side switching, PNP current sources, and small-signal gain. Being PNP, it turns on when the base is pulled below the emitter. The TO-92 leads are E, B, C in order (pin 1 = emitter).++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | E | passive | Emitter of the PNP BJT. VEBO breakdown = 5.0 V (reverse). In normal PNP operation the emitter is the most positive terminal, with current flowing from emitter to collector. |+| 2 | B | input | Base of the PNP BJT. Control terminal; pulling the base below the emitter by ~0.65-0.85 V (VBE(sat)) forward-biases the B-E junction and turns the transistor on. IBL (base cutoff) = 50 nA max at VBE = 3.0 V. |+| 3 | C | passive | Collector of the PNP BJT. VCEO breakdown = 40 V (reverse), VCBO = 40 V, IC = 200 mA continuous. VCE(sat) = 0.25 V max at IC = 10 mA, IB = 1.0 mA. In normal PNP operation the collector sinks current toward the more-negative supply. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | PNP bipolar transistor |+| Collector-emitter (VCEO) | -40 V |+| Collector current (IC) | -200 mA |+| DC gain (hFE) | 100-300 |+| Transition freq (fT) | 250 MHz |+| Power dissipation | 625 mW |+| Pinout | E-B-C (pin 1 = emitter) |+| Package | TO-92 |++## Ordering variants++- `2N3906BU (TO-92)`+- `2N3906TA (TO-92, ammo pack)`++## CAD (KiCad official)++- Symbol: `Transistor_BJT:2N3906`+- Footprint: `Package_TO_SOT_THT:TO-92_Inline`+- 3D model: TO-92 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [onsemi datasheet](https://media.digikey.com/pdf/Data%20Sheets/Fairchild%20PDFs/2N3906.pdf) (6 pp, sha256 `0173a9cdd84dfe57`, 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/2n3906-datasheet.pdf)

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