component
2N3904U
Public Made by Adomby adom
CBI Bipolar (BJT), SOT-89. 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
markdown2N3904U
CBI · Bipolar (BJT) · SOT-89
2N3904U from CBI, in a SOT-89. 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 | B | input | Base; emitter-base voltage VEBO max 6 V. |
| 2 | C | passive | Collector (also the tab on SOT-89); VCBO 60 V, VCEO 40 V, IC continuous 0.2 A, PC 0.5 W. |
| 3 | E | passive | Emitter of the NPN transistor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89 |
| Category | Transistors/Thyristors |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 60 | V | IC=10μA,IE=0 | 1 | ||
| Collector-emitter breakdown voltage | V(BR)CEO | 40 | V | IC=1mA,IB=0 | 1 | ||
| Emitter-base breakdown voltage | V(BR)EBO | 6 | V | IE=10μA,IC=0 | 1 | ||
| Collector cut-off current | ICBO | 0.05 | μA | VCB=30V,IE=0 | 1 | ||
| Emitter cut-off current | IEBO | 0.05 | μA | VEB=6V,IC=0 | 1 | ||
| DC current gain | hFE(1) | 60 | VCE=1V,IC=0.1mA | 1 | |||
| DC current gain | hFE(2) | 80 | VCE=1V,IC=1mA | 1 | |||
| DC current gain | hFE(3) | 100 | 300 | VCE=1V,IC=10mA | 1 | ||
| DC current gain | hFE(5) | 30 | VCE=1V,IC=100mA | 1 | |||
| Collector-emitter saturation voltage | VCE(sat)1 | 0.2 | V | IC=10mA,IB=1mA | 1 | ||
| Collector-emitter saturation voltage | VCE(sat)2 | 0.3 | V | IC=50mA,IB=5mA | 1 | ||
| Base-emitter saturation voltage | VBE(sat)1 | 0.65 | 0.85 | V | IC=10mA,IB=1mA | 1 | |
| Base-emitter saturation voltage | VBE(sat)2 | 0.95 | V | IC=50mA,IB=5mA | 1 | ||
| Transition frequency | fT | 300 | MHz | VCE=20V,IC=10mA,f=100MHz | 1 | ||
| Collector capacitance | Cc | 4 | pF | VCB=5V,IE=0,f=1MHz | 1 | ||
| Emitter capacitance | Ce | 8 | pF | VEB=0.5V,IC=0,f=1MHz | 1 | ||
| Noise figure | NF | 5 | dB | VCE=5V,Ic=0.1mA,f=10Hz-15.7kHz, RS=1KΩ | 1 | ||
| Collector cut-off current (ICEX) | ICEX | 0.05 | μA | VCE=30V,VBE(off)=3V | 1 | ||
| Collector-base voltage | VCBO | 60 | V | 1 | |||
| Collector-emitter voltage | VCEO | 40 | V | 1 | |||
| Emitter-base voltage | VEBO | 6 | V | 1 | |||
| Collector current - continuous | IC | 0.2 | A | 1 | |||
| Collector power dissipation | PC | 0.5 | W | 1 | |||
| Junction temperature | TJ | 150 | ℃ | 1 | |||
| Storage temperature | Tstg | -55 | 150 | ℃ | 1 |
CAD (KiCad official)
- Symbol:
2N3904U - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files:
2n3904u-etched.step/2n3904u-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);2n3904u.step/2n3904u.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: CBI datasheet (2 pp, sha256
e57155aa22dcf8e5, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).