component
BCX51
Public Made by Adomby adom
Nexperia 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
markdownBCX51
Nexperia · Bipolar (BJT) · SOT-89
BCX51 from Nexperia, 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 | emitter | passive | Emitter of the PNP transistor, the pin that the base-emitter voltage and emitter current are referenced to (VEBO maximum 5 V). |
| 2 | collector | passive | Collector of the PNP transistor, which is also the exposed collector pad that provides good heat transfer; collector current is limited to 1 A (IC) and collector-emitter voltage to 45 V (VCEO). |
| 3 | base | passive | Base of the PNP transistor; base current is limited to 0.3 A (IB). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| 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 voltage | VCBO | 45 | V | open emitter | 4 | ||
| Collector-emitter voltage | VCEO | 45 | V | open base | 4 | ||
| Emitter-base voltage | VEBO | 5 | V | open collector | 4 | ||
| Collector current | IC | 1 | A | 4 | |||
| Peak collector current | ICM | 2 | A | single pulse; tp ≤ 1 ms | 4 | ||
| Base current | IB | 0.3 | A | 4 | |||
| Peak base current | IBM | 0.3 | A | single pulse; tp ≤ 1 ms | 4 | ||
| Total power dissipation | Ptot | 0.5 | W | Tamb ≤ 25 °C; FR4 PCB, single-sided copper, standard footprint [1] | 4 | ||
| Total power dissipation | Ptot | 0.95 | W | Tamb ≤ 25 °C; FR4 PCB, single-sided copper, mounting pad for collector 1 cm2 [2] | 4 | ||
| Total power dissipation | Ptot | 1.35 | W | Tamb ≤ 25 °C; FR4 PCB, single-sided copper, mounting pad for collector 6 cm2 [3] | 4 | ||
| Junction temperature | Tj | 150 | °C | 4 | |||
| Ambient temperature | Tamb | -55 | 150 | °C | 4 | ||
| Storage temperature | Tstg | -65 | 150 | °C | 4 | ||
| Thermal resistance junction to ambient | Rth(j-a) | 250 | K/W | in free air; FR4 PCB, single-sided copper, standard footprint [1] | 6 | ||
| Thermal resistance junction to ambient | Rth(j-a) | 132 | K/W | in free air; FR4 PCB, single-sided copper, mounting pad for collector 1 cm2 [2] | 6 | ||
| Thermal resistance junction to ambient | Rth(j-a) | 93 | K/W | in free air; FR4 PCB, single-sided copper, mounting pad for collector 6 cm2 [3] | 6 | ||
| Thermal resistance junction to solder point | Rth(j-sp) | 16 | K/W | 6 | |||
| Collector-base cut-off current | ICBO | 100 | nA | VCB = 30 V; IE = 0 A | 12 | ||
| Collector-base cut-off current | ICBO | 10 | µA | VCB = 30 V; IE = 0 A; Tj = 150 °C | 12 | ||
| Emitter-base cut-off current | IEBO | 100 | nA | VEB = 5 V; IC = 0 A | 12 | ||
| DC current gain | hFE | 63 | VCE = 2 V; IC = 5 mA | 12 | |||
| DC current gain | hFE | 63 | 250 | VCE = 2 V; IC = 150 mA | 12 | ||
| DC current gain | hFE | 40 | VCE = 2 V; IC = 500 mA; pulse test [1] | 12 | |||
| Collector-emitter saturation voltage | VCEsat | 0.5 | V | IC = 500 mA; IB = 50 mA; pulse test [1] | 12 | ||
| Base-emitter voltage | VBE | 1 | V | VCE = 2 V; IC = 500 mA; pulse test [1] | 12 |
CAD (KiCad official)
- Symbol:
BCX51 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files:
bcx51-etched.step/bcx51-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bcx51.step/bcx51.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Nexperia datasheet (22 pp, sha256
0e4647b987f3b8fb, retrieved 2026-10-18, 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).