component

2SA1721-O

Public Made by Adom

by adom

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

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2SA1721-O

TOSHIBA · Bipolar (BJT) · SOT-23

2SA1721-O from TOSHIBA, in a SOT-23. 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 BASE input Base terminal; emitter-base voltage limited to -5 V and base current to -20 mA maximum.
2 EMITTER passive Emitter terminal of the PNP transistor; collector-emitter voltage rating is -300 V.
3 COLLECTOR passive Collector terminal; collector current up to -100 mA, collector-base voltage -300 V, power dissipation 150 mW.

Key specifications

Parameter Value
Manufacturer TOSHIBA
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 cut-off current ICBO -0.1 μA VCB = −300 V, IE = 0 2
Emitter cut-off current IEBO -0.1 μA VEB = −5 V, IC = 0 2
Collector-base breakdown voltage V (BR) CBO -300 V IC = −0.1 mA, IE = −0 2
Collector-emitter breakdown voltage V (BR) CEO -300 V IC = −1 mA, IB = −0 2
DC current gain, O classification hFE (1) 50 150 VCE = −10 V, IC = −20 mA; O-grade range per note 2
DC current gain hFE (2) 20 VCE = −10 V, IC = −1 mA 2
Collector-emitter saturation voltage VCE (sat) -0.5 V IC = −20 mA, IB = −2 mA 2
Base-emitter saturation voltage VBE (sat) -1.2 V IC = −20 mA, IB = −2 mA 2
Transition frequency fT 50 55 MHz VCE = −10 V, IC = −20 mA 2
Collector output capacitance Cob 5.5 6 pF VCB = −20 V, IE = 0, f = 1 MHz 2
Collector-base voltage VCBO -300 V 1
Collector-emitter voltage VCEO -300 V 1
Emitter-base voltage VEBO -5 V 1
Collector current IC -100 mA 1
Base current IB -20 mA 1
Collector power dissipation PC 150 mW 1
Junction temperature Tj 150 °C 1
Storage temperature range Tstg -55 150 °C 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
housing PC Base current IB −20 mA Collector power dissipation PC 150 mW 1

CAD (KiCad official)

  • Symbol: 2SA1721-O
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: 2sa1721-o-etched.step / 2sa1721-o-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2sa1721-o.step / 2sa1721-o.glb are the bare package body.

Provenance

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

  • Datasheet: TOSHIBA datasheet (5 pp, sha256 823f1dd837fc60f0, retrieved 2026-10-17, 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