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BCX51

Public Made by Adom

by adom

Nexperia Bipolar (BJT), SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BCX51

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bcx51.step / bcx51.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF