component
BCX71K
Public Made by Adomby adom
Nexperia Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487
{
"schema_version": 1,
"type": "component",
"slug": "bcx71k",
"title": "BCX71K",
"brief": "Nexperia Bipolar (BJT), SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"transistors-thyristors",
"bcx71k",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "BCX71K",
"manufacturer": "Nexperia",
"package": "SOT-23",
"pin_count": 3,
"category": "Transistors/Thyristors",
"subcategory": "Bipolar (BJT)",
"datasheet": "https://assets.nexperia.com/documents/data-sheet/BCX71K.pdf",
"parts": {
"symbol": "bcx71k.kicad_sym",
"footprint": "bcx71k.kicad_mod",
"model_3d": "bcx71k-hero.glb",
"model_3d_plain": "bcx71k-etched.glb",
"model_3d_step": "bcx71k-etched.step",
"model_3d_step_plain": "bcx71k.step",
"lbr": "bcx71k.lbr"
},
"distributor_links": {
"lcsc": "C549708"
},
"distributor_check": {
"checked_at": "2026-10-17T15:04:16Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
},
"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "B",
"type": "passive",
"description": "Base terminal of the PNP transistor; the datasheet limits peak base current to -200 mA (single pulse, tp ≤ 1 ms)."
},
{
"number": "2",
"name": "E",
"type": "passive",
"description": "Emitter terminal of the PNP transistor; the emitter-base voltage is limited to -5 V (VEBO, open collector)."
},
{
"number": "3",
"name": "C",
"type": "passive",
"description": "Collector terminal of the PNP transistor; limited to -45 V collector-base voltage (VCBO, open emitter) and -100 mA continuous collector current (IC)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"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 datasheet names the pins only as base, emitter and collector and gives no ERC electrical type. T"
],
"pages_sent": 8,
"cost_usd": 0.0386,
"at": "2026-10-17T15:03:05"
},
"datasheet": {
"url": "https://assets.nexperia.com/documents/data-sheet/BCX71K.pdf",
"pages": 8,
"sha256": "a551658d16d999eb",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 3,
"described": 3,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "bcx71k.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
2.5,
3,
1.2
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
"checked": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "bcx71k-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
2.5,
3,
1.2
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "0ca0827da39a591ffa7533c309aabd0a9ff4af9c5ea7fda1888aa7fadba3e91e",
"checked": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Nexperia",
"Package": "SOT-23",
"Category": "Transistors/Thyristors",
"Pins": "3"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "a551658d16d999ebb5beae23daedbde7f0f3c146181e10a2d6ca83dc9d156cc5",
"rows": [
{
"name": "Collector-base voltage",
"symbol": "VCBO",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": -45,
"conditions": "open emitter",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Collector-emitter voltage",
"symbol": "VCEO",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": -45,
"conditions": "open base",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Emitter-base voltage",
"symbol": "VEBO",
"kind": "absolute_maximum",
"unit": "V",
"min": null,
"typ": null,
"max": -5,
"conditions": "open collector",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Collector current",
"symbol": "IC",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": -100,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Peak collector current",
"symbol": "ICM",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": -200,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Peak base current",
"symbol": "IBM",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": -200,
"conditions": "single pulse; tp ≤ 1 ms",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Total power dissipation",
"symbol": "Ptot",
"kind": "absolute_maximum",
"unit": "mW",
"min": null,
"typ": null,
"max": 250,
"conditions": "Tamb ≤ 25 °C",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Junction temperature",
"symbol": "Tj",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Ambient temperature",
"symbol": "Tamb",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Storage temperature",
"symbol": "Tstg",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Thermal resistance from junction to ambient",
"symbol": "Rth(j-a)",
"kind": "thermal",
"unit": "K/W",
"min": null,
"typ": null,
"max": 500,
"conditions": "Device mounted on an FR4 PCB, single-sided copper, tin-plated and standard footprint",
"source_page": 2,
"source": "datasheet"
},
{
"name": "Collector-base cut-off current",
"symbol": "ICBO",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": null,
"max": -20,
"conditions": "VCB = -45 V; IE = 0 A; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Collector-base cut-off current",
"symbol": "ICBO",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": -20,
"conditions": "VCB = -45 V; IE = 0 A; Tamb = 150 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Emitter-base cut-off current",
"symbol": "IEBO",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": null,
"max": -20,
"conditions": "VEB = -4 V; IC = 0 µA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC current gain",
"symbol": "hFE",
"kind": "electrical",
"unit": "",
"min": 100,
"typ": null,
"max": null,
"conditions": "VCE = -5 V; IC = -10 µA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC current gain",
"symbol": "hFE",
"kind": "electrical",
"unit": "",
"min": 380,
"typ": null,
"max": 630,
"conditions": "VCE = -5 V; IC = -2 mA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "DC current gain",
"symbol": "hFE",
"kind": "electrical",
"unit": "",
"min": 110,
"typ": null,
"max": null,
"conditions": "VCE = -1 V; IC = -50 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Collector-emitter saturation voltage",
"symbol": "VCEsat",
"kind": "electrical",
"unit": "mV",
"min": -60,
"typ": null,
"max": -250,
"conditions": "IC = -10 mA; IB = -0.25 mA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Collector-emitter saturation voltage",
"symbol": "VCEsat",
"kind": "electrical",
"unit": "mV",
"min": -120,
"typ": null,
"max": -550,
"conditions": "IC = -50 mA; IB = -1.25 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Base-emitter saturation voltage",
"symbol": "VBEsat",
"kind": "electrical",
"unit": "mV",
"min": -600,
"typ": null,
"max": -850,
"conditions": "IC = -10 mA; IB = -0.25 mA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Base-emitter saturation voltage",
"symbol": "VBEsat",
"kind": "electrical",
"unit": "mV",
"min": -680,
"typ": null,
"max": -1050,
"conditions": "IC = -50 mA; IB = -1.25 mA; pulsed; tp ≤ 300 µs; δ ≤ 0.02; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Base-emitter voltage",
"symbol": "VBE",
"kind": "electrical",
"unit": "mV",
"min": -600,
"typ": -650,
"max": -750,
"conditions": "VCE = -5 V; IC = -2 mA; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Transition frequency",
"symbol": "fT",
"kind": "electrical",
"unit": "MHz",
"min": 100,
"typ": null,
"max": null,
"conditions": "VCE = -5 V; IC = -10 mA; f = 100 MHz; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
},
{
"name": "Noise figure",
"symbol": "NF",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": 2,
"max": 6,
"conditions": "VCE = -5 V; IC = -200 µA; RS = 2 kΩ; f = 1 kHz; B = 200 Hz; Tamb = 25 °C",
"source_page": 3,
"source": "datasheet"
}
]
}
},
"variants": [],
"sections": [
"hero",
"viewers",
"readme",
"breadcrumbs",
"info"
],
"discovery_triggers": [
"bcx71k"
],
"discovery_pitch": "BCX71K (Nexperia) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
"hero": {
"type": "image",
"path": "docs/hero.png"
},
"files": [
"page.json",
"README.md",
"bcx71k.kicad_sym",
"bcx71k.kicad_mod",
"bcx71k.glb",
"bcx71k.step",
"bcx71k.lbr",
"docs/hero.png",
"docs/bcx71k-datasheet.pdf",
"viewers/symbol.html",
"viewers/footprint.html",
"bcx71k-hero.glb",
"bcx71k-hero.overlay.json",
"bcx71k-etched.glb"
],
"visibility": {
"public": true
}
}