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BC637-TA

Public Made by Adom

by adom

Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BC637-TA

Changjing · Bipolar (BJT) · TO-92

BC637-TA from Changjing, 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 EMITTER passive Emitter terminal of the NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V.
2 COLLECTOR passive Collector terminal; for BC637 the collector-emitter voltage VCEO is 60 V and continuous collector current IC is 1 A, with collector power dissipation PC of 0.83 W.
3 BASE passive Base terminal of the NPN transistor; the saturation test condition is IC=500 mA with IB=50 mA (VCE(sat) 0.5 V max).

Key specifications

Parameter Value
Manufacturer Changjing
Package TO-92
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-Emitter Voltage (VCBO), BC637 VCBO 60 V 1
Collector-Emitter Voltage (VCEO), BC637 VCEO 60 V 1
Emitter-Base Voltage VEBO 5 V 1
Collector Current - Continuous IC 1 A 1
Collector Power Dissipation PC 0.83 W Ta=25℃ 1
Operation Junction and Storage Temperature Range TJ,Tstg -55 150 ℃ 1
Collector-emitter breakdown voltage, BC637 V(BR)CEO 60 V IC=10mA, IB=0 2
Collector cut-off current ICBO 0.1 μA VCB=30 V, IE=0 2
Emitter cut-off current IEBO 0.1 μA VEB=5V, IB=0 2
DC current gain hFE(1) hFE(1) 25 VCE=2 V, IC=5mA 2
DC current gain hFE(3) hFE(3) 25 VCE=2V, IC=500mA 2
Collector-emitter saturation voltage VCE(sat) 0.5 V IC=500mA, IB=50mA 2
Base-emitter voltage VBE 1 V VCE=2V, IC=500mA 2
Transition frequency fT 100 MHz VCE=5V, IC=10mA, f=50 MHZ 2

CAD (KiCad official)

  • Symbol: BC637-TA
  • Footprint: Package_TO_SOT_THT:TO-92_Inline
  • 3D model: TO-92 (KiCad packages3D, STEP)
  • 3D model files: bc637-ta-etched.step / bc637-ta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc637-ta.step / bc637-ta.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (5 pp, sha256 52e4f6f4f4a84afe, 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