component
BC639
Public Made by Adomby adom
Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "BC639",
"brief": "Changjing Bipolar (BJT), TO-92. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"source": "Component Ocean /api/assign-pns",
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"pn": null,
"status": "no match"
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"pn": "522-BC639",
"status": "found",
"lifecycle": "Obsolete"
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"type": "passive",
"description": "Emitter of the NPN transistor; emitter-base voltage is limited to 5 V (VEBO) and emitter cut-off current is 0.1 µA max at VEB = 5 V."
},
{
"number": "2",
"name": "COLLECTOR",
"type": "passive",
"description": "Collector of the NPN transistor; continuous collector current is limited to 1 A and collector-emitter voltage to 45 V (BC635), 60 V (BC637) or 80 V (BC639) VCEO, with total power dissipation of 0.83 W."
},
{
"number": "3",
"name": "BASE",
"type": "passive",
"description": "Base of the NPN transistor; the datasheet specifies VBE of 1 V max at VCE = 2 V and IC = 500 mA."
}
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"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The pin assignment for TO-92 is given only as a text label (1. EMITTER, 2. COLLECTOR, 3. BASE) on pa; The datasheet covers BC635, BC637 and BC639 in one document and the ordering table lists bulk and ta"
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"at": "2026-10-17T05:47:39"
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"sha256": "52e4f6f4f4a84afe",
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"cad": "KiCad official (CC-BY-SA 4.0)",
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"centre_offset_mm": 0.542,
"footprint_binding": "identity",
"sha256": "f0b61c32ecbf0067157adc5a3d4966ceadf5d6dafe93c51af35f76c41c71a54a",
"checked": "2026-10-17",
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"metadata": {
"specs": {
"Manufacturer": "Changjing",
"Package": "TO-92",
"Category": "Transistors/Thyristors",
"Pins": "3"
},
"characteristics": {
"version": 1,
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"rows": [
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"name": "Collector-Emitter Voltage (VCBO row, BC639)",
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"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": 100,
"conditions": "",
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{
"name": "Collector-Emitter Voltage (VCEO row, BC639)",
"symbol": "VCEO",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": 80,
"conditions": "",
"source_page": 1,
"source": "datasheet"
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{
"name": "Emitter-Base Voltage",
"symbol": "VEBO",
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"min": null,
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"max": 5,
"conditions": "",
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{
"name": "Collector Current -Continuous",
"symbol": "IC",
"kind": "absolute_maximum",
"unit": "A",
"min": null,
"typ": null,
"max": 1,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Collector Power Dissipation",
"symbol": "PC",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 0.83,
"conditions": "",
"source_page": 1,
"source": "datasheet"
},
{
"name": "Operation Junction and Storage Temperature Range",
"symbol": "TJ,Tstg",
"kind": "absolute_maximum",
"unit": "℃",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 1,
"source": "datasheet"
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{
"name": "Collector-emitter breakdown voltage",
"symbol": "V(BR)CEO",
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"min": 80,
"typ": null,
"max": null,
"conditions": "IC=10mA, IB=0",
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{
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"unit": "μA",
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"typ": null,
"max": 0.1,
"conditions": "VCB= 30 V, IE=0",
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{
"name": "Emitter cut-off current",
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"typ": null,
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"conditions": "VEB=5V, IB=0",
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},
{
"name": "DC current gain hFE(1)",
"symbol": "hFE(1)",
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"conditions": "VCE=2 V, IC= 5mA",
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{
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{
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{
"name": "Base-emitter voltage",
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"min": null,
"typ": null,
"max": 1,
"conditions": "VCE=2V, IC=500mA",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Transition frequency",
"symbol": "fT",
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"unit": "MHz",
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"typ": null,
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"conditions": "VCE=5V, IC=10mA, f=50 MHZ",
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"email": "[email protected]"
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