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BC817-40LT1G

Public Made by Adom

by adom

onsemi Bipolar (BJT), SOT-23. 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 bc817-40lt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers bc817-40lt1g: symbol viewer · Ray
bc817-40lt1g-etched.fit.json bc817-40lt1g: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
bc817-40lt1g-etched.glb bc817-40lt1g: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40lt1g-etched.step bc817-40lt1g: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40lt1g-hero.glb bc817-40lt1g: hero from the plain model · Ray
bc817-40lt1g-hero.overlay.json bc817-40lt1g: hero from the plain model · Ray
bc817-40lt1g.glb Publish 0.1.0 · Ray
bc817-40lt1g.kicad_mod Publish 0.1.0 · Ray
bc817-40lt1g.kicad_sym bc817-40lt1g: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40lt1g.lbr bc817-40lt1g: one-pass backfill (symbol Device:Q_NPN, re-etched, hero rebuilt in-pass (inputs changed)) · Ray
bc817-40lt1g.step Publish 0.1.0 · Ray
package.json Publish 0.1.1 · Ray
page.json Publish 0.1.1 · Ray
README.md bc817-40lt1g: specified limits as data (metadata.characteristics, 19 rows from the datasheet) · Ray

BC817-40LT1G

onsemi · Bipolar (BJT) · SOT-23

BC817-40LT1G from onsemi, in a SOT-23. 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 control terminal; emitter-base voltage maximum rating VEBO = 5.0 V
2 EMITTER passive Emitter terminal; junction and storage temperature range −65 to +150°C
3 COLLECTOR output Collector terminal; maximum continuous collector current IC = 500 mA and maximum collector-emitter voltage VCEO = 45 V

Key specifications

Parameter Value
Manufacturer onsemi
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-Emitter Breakdown Voltage V(BR)CEO 45 V IC = 10 mA 2
Collector-Emitter Breakdown Voltage V(BR)CES 50 V VEB = 0, IC = 10 A 2
Emitter-Base Breakdown Voltage V(BR)EBO 5 V IE = 1.0 A 2
Collector Cutoff Current ICBO 100 nA VCB = 20 V 2
Collector Cutoff Current ICBO 5 A VCB = 20 V, TA = 150°C 2
DC Current Gain (BC817-40) hFE 250 600 IC = 100 mA, VCE = 1.0 V 2
DC Current Gain (BC817-40) hFE 40 IC = 500 mA, VCE = 1.0 V 2
Collector-Emitter Saturation Voltage VCE(sat) 0.7 V IC = 500 mA, IB = 50 mA 2
Base-Emitter On Voltage VBE(on) 1.2 V IC = 500 mA, VCE = 1.0 V 2
Current-Gain-Bandwidth Product fT 100 MHz IC = 10 mA, VCE = 5.0 Vdc, f = 100 MHz 2
Collector-Emitter Voltage VCEO 45 V 1
Collector-Base Voltage VCBO 50 V 1
Emitter-Base Voltage VEBO 5 V 1
Collector Current - Continuous IC 500 mA 1
Junction and Storage Temperature TJ, Tstg -65 150 °C 1
Total Device Dissipation PD 225 mW FR-5 board, TA = 25°C 1
Total Device Dissipation PD 300 mW Alumina substrate, TA = 25°C 1
Thermal Resistance, Junction-to-Ambient RJA 556 °C/W FR-5 board 1
Thermal Resistance, Junction-to-Ambient RJA 417 °C/W Alumina substrate 1

CAD (KiCad official)

  • Symbol: BC817-40LT1G
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: bc817-40lt1g-etched.step / bc817-40lt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bc817-40lt1g.step / bc817-40lt1g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (10 pp, sha256 8e29433528090adb, retrieved 2026-09-23, 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