component

2SD1781KT146R

Public Made by Adom

by adom

ROHM Semicon Bipolar (BJT), TO-236-3(SOT-23-3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
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docs Publish 0.1.0 · Ray 12d ago
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2sd1781kt146r-etched.glb Publish 0.1.0 · Ray 12d ago
2sd1781kt146r-etched.step 2sd1781kt146r: factory component page (tier=lcsc) · Ray 12d ago
2sd1781kt146r-hero.glb 2sd1781kt146r: hero GLB from the etched model (keeps the MPN mark) · Ray 12d ago
2sd1781kt146r-hero.overlay.json Publish 0.1.0 · Ray 12d ago
2sd1781kt146r.glb Publish 0.1.0 · Ray 12d ago
2sd1781kt146r.kicad_mod Publish 0.1.0 · Ray 12d ago
2sd1781kt146r.kicad_sym Publish 0.1.0 · Ray 12d ago
2sd1781kt146r.lbr Publish 0.1.0 · Ray 12d ago
2sd1781kt146r.step Publish 0.1.0 · Ray 12d ago
package.json Publish 0.1.0 · Ray 12d ago
page.json 2sd1781kt146r: specified limits as data (metadata.characteristics, 15 rows from the datasheet) · Ray 11d ago
README.md 2sd1781kt146r: specified limits as data (metadata.characteristics, 15 rows from the datasheet) · Ray 11d ago

2SD1781KT146R

ROHM Semicon · Bipolar (BJT) · TO-236-3(SOT-23-3)

2SD1781KT146R from ROHM Semicon, in a TO-236-3(SOT-23-3). 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 E passive Emitter terminal of the NPN transistor, with VEBO rated 5 V maximum.
2 B passive Base terminal of the NPN transistor, driven with IB=50mA for IC=500mA at VCE(sat) of 0.1V typ.
3 C passive Collector terminal of the NPN transistor, rated VCEO 32 V, VCBO 40 V and IC 800 mA continuous (1.5 A pulsed).

Key specifications

Parameter Value
Manufacturer ROHM Semicon
Package TO-236-3(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 voltage VCBO 40 V 2
Collector-emitter voltage VCEO 32 V 2
Emitter-base voltage VEBO 5 V 2
Collector current IC 800 mA 2
Collector current (pulse) ICP 1.5 A Pw=100ms Single pulse 2
Power dissipation PD 200 mW Each terminal mounted on a reference land 2
Junction temperature Tj 150 ℃ 2
Range of storage temperature Tstg -55 150 ℃ 2
Collector-base breakdown voltage BVCBO 40 V IC = 50μA 2
Collector-emitter breakdown voltage BVCEO 32 V IC = 1mA 2
Emitter-base breakdown voltage BVEBO 5 V IE = 50μA 2
Collector cut-off current ICBO 500 nA VCB = 20V 2
Emitter cut-off current IEBO 500 nA VEB = 4V 2
Collector-emitter saturation voltage VCE(sat) 100 400 mV IC = 500mA, IB = 50mA 2
DC current gain hFE 120 390 - VCE = 3V, IC = 100mA 2

CAD (KiCad official)

  • Symbol: 2SD1781KT146R
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: TO-236-3(SOT-23-3) (KiCad packages3D, STEP)
  • 3D model files: 2sd1781kt146r-etched.step / 2sd1781kt146r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2sd1781kt146r.step / 2sd1781kt146r.glb are the bare package body.

Provenance

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

  • Datasheet: ROHM Semicon datasheet (8 pp, sha256 abe3769562c69ce5, retrieved 2026-10-13, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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