component

BCX71K

Public Made by Adom

by adom

Nexperia Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BCX71K

Nexperia · Bipolar (BJT) · SOT-23

BCX71K from Nexperia, in a SOT-23. 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 passive Base terminal of the PNP transistor; the datasheet limits peak base current to -200 mA (single pulse, tp ≤ 1 ms).
2 E passive Emitter terminal of the PNP transistor; the emitter-base voltage is limited to -5 V (VEBO, open collector).
3 C passive Collector terminal of the PNP transistor; limited to -45 V collector-base voltage (VCBO, open emitter) and -100 mA continuous collector current (IC).

Key specifications

Parameter Value
Manufacturer Nexperia
Package SOT-23
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 2
Collector-emitter voltage VCEO -45 V open base 2
Emitter-base voltage VEBO -5 V open collector 2
Collector current IC -100 mA 2
Peak collector current ICM -200 mA 2
Peak base current IBM -200 mA single pulse; tp ≤ 1 ms 2
Total power dissipation Ptot 250 mW Tamb ≤ 25 °C 2
Junction temperature Tj 150 °C 2
Ambient temperature Tamb -65 150 °C 2
Storage temperature Tstg -65 150 °C 2
Thermal resistance from junction to ambient Rth(j-a) 500 K/W Device mounted on an FR4 PCB, single-sided copper, tin-plated and standard footprint 2
Collector-base cut-off current ICBO -20 nA VCB = -45 V; IE = 0 A; Tamb = 25 °C 3
Collector-base cut-off current ICBO -20 µA VCB = -45 V; IE = 0 A; Tamb = 150 °C 3
Emitter-base cut-off current IEBO -20 nA VEB = -4 V; IC = 0 µA; Tamb = 25 °C 3
DC current gain hFE 100 VCE = -5 V; IC = -10 µA; Tamb = 25 °C 3
DC current gain hFE 380 630 VCE = -5 V; IC = -2 mA; Tamb = 25 °C 3
DC current gain hFE 110 VCE = -1 V; IC = -50 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C 3
Collector-emitter saturation voltage VCEsat -60 -250 mV IC = -10 mA; IB = -0.25 mA; Tamb = 25 °C 3
Collector-emitter saturation voltage VCEsat -120 -550 mV IC = -50 mA; IB = -1.25 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C 3
Base-emitter saturation voltage VBEsat -600 -850 mV IC = -10 mA; IB = -0.25 mA; Tamb = 25 °C 3
Base-emitter saturation voltage VBEsat -680 -1050 mV IC = -50 mA; IB = -1.25 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C 3
Base-emitter voltage VBE -600 -650 -750 mV VCE = -5 V; IC = -2 mA; Tamb = 25 °C 3
Transition frequency fT 100 MHz VCE = -5 V; IC = -10 mA; f = 100 MHz; Tamb = 25 °C 3
Noise figure NF 2 6 dB VCE = -5 V; IC = -200 µA; RS = 2 kΩ; f = 1 kHz; B = 200 Hz; Tamb = 25 °C 3

CAD (KiCad official)

  • Symbol: BCX71K
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bcx71k-etched.step / bcx71k-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bcx71k.step / bcx71k.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Nexperia datasheet (8 pp, sha256 a551658d16d999eb, retrieved 2026-10-17, tier: manufacturer)
  • 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