component

BC817-40

Public Made by Adom

by adom

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

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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
Name Last commit message Last updated
docs bc817-40: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers bc817-40: symbol viewer · Ray
bc817-40-etched.fit.json bc817-40: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
bc817-40-etched.glb bc817-40: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40-etched.step bc817-40: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40-hero.glb bc817-40: hero from the plain model · Ray
bc817-40-hero.overlay.json bc817-40: hero from the plain model · Ray
bc817-40.glb Publish 0.1.0 · Ray
bc817-40.kicad_mod Publish 0.1.0 · Ray
bc817-40.kicad_sym bc817-40: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40.lbr bc817-40: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40.step Publish 0.1.0 · Ray
package.json Publish 0.1.1 · Ray
page.json Publish 0.1.1 · Ray
README.md bc817-40: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray

BC817-40

UMW · Bipolar (BJT) · SOT-23-3

BC817-40 from UMW, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 BASE input Base terminal of NPN transistor; maximum collector-base voltage is 50 V.
2 EMITTER passive Emitter terminal of NPN transistor; maximum emitter-base voltage is 5 V.
3 COLLECTOR passive Collector terminal of NPN transistor; maximum collector-emitter voltage is 45 V and maximum continuous collector current is 0.5 A.

Key specifications

Parameter Value
Manufacturer UMW
Package SOT-23-3
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 breakdown voltage VCBO 50 V IC= 10μA, IE=0 1
Collector-emitter breakdown voltage VCEO 45 V IC= 10mA, IB=0 1
Emitter-base breakdown voltage VEBO 5 V IE= 1μA, IC=0 1
Collector cutoff current ICBO 0.1 μA VCB= 45 V, IE=0 1
Emitter cutoff current IEBO 0.1 μA VEB= 4V, IC=0 1
DC current gain hFE(1) hFE(1) 100 600 VCE= 1V, IC= 100mA 1
DC current gain hFE(2) hFE(2) 40 VCE= 1V, IC= 500mA 1
Collector-emitter saturation voltage VCE(sat) 0.7 V IC= 500mA, IB= 50mA 1
Base-emitter saturation voltage VBE(sat) 1.2 V IC= 500mA, IB= 50mA 1
Base-emitter voltage VBE 1.2 V VCE= 1 V, IC= 500mA 1
Collector capacitance Cob 10 pF VCB=10V, f=1MHz 1
Transition frequency fT 100 MHz VCE= 5 V, IC= 10mA, f=100MHz 1
Collector-base voltage VCBO 50 V Ta=25℃ unless otherwise noted 1
Collector-emitter voltage VCEO 45 V Ta=25℃ unless otherwise noted 1
Emitter-base voltage VEBO 5 V Ta=25℃ unless otherwise noted 1
Collector current, continuous IC 0.5 A Ta=25℃ unless otherwise noted 1
Collector power dissipation PC 0.3 W Ta=25℃ unless otherwise noted 1
Junction temperature TJ 150 ℃ 1
Storage temperature TSTG -55 150 ℃ 1

CAD (KiCad official)

  • Symbol: BC817-40
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: bc817-40-etched.step / bc817-40-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc817-40.step / bc817-40.glb are the bare package body.

Provenance

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

  • Datasheet: UMW datasheet (3 pp, sha256 691dd222da71b060, retrieved 2026-09-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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