component
2N3904BU
Public Made by Adomby adom
onsemi Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown2N3904BU
onsemi · Bipolar (BJT) · TO-92
2N3904BU from onsemi, in a TO-92. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | E | passive | Emitter of the NPN transistor, rated with an emitter-base voltage (VEBO) of 6.0 V maximum per the absolute maximum ratings. |
| 2 | B | passive | Base of the NPN transistor, which is the control terminal; the datasheet specifies VBE(sat) of 0.65 to 0.85 V at IC = 10 mA, IB = 1.0 mA. |
| 3 | C | passive | Collector of the NPN transistor, rated at 40 V collector-emitter voltage (VCEO) and 200 mA continuous collector current (IC). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
2N3904BU - Footprint:
Package_TO_SOT_THT:TO-92_Inline - 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files:
2n3904bu-etched.step/2n3904bu-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);2n3904bu.step/2n3904bu.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (13 pp, sha256
9425dc0e7ade58bc, retrieved 2026-10-09, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).