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2SA1774

Public Made by Adom

by adom

Changjing Bipolar (BJT), SOT-523. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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2SA1774

Changjing · Bipolar (BJT) · SOT-523

2SA1774 from Changjing, in a SOT-523. 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 of the PNP transistor, driven with IB=-5.0 mA in the datasheet's saturation test at IC=-50 mA; emitter-base voltage is rated at VEBO -6 V.
2 EMITTER passive Emitter terminal of the PNP transistor; the datasheet lists the emitter-base breakdown voltage V(BR)EBO as -6.0 V minimum at IE=-50 µA and the absolute maximum emitter-base voltage as -6 V.
3 COLLECTOR passive Collector terminal of the PNP transistor; rated at -60 V collector-base (VCBO) and -50 V collector-emitter (VCEO), with -150 mA continuous collector current and 150 mW collector power dissipation.

Key specifications

Parameter Value
Manufacturer Changjing
Package SOT-523
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
DC current gain (hFE rank range, Q/R/S) hFE(1) 120 560 VCE=-6.0V, IC=-1.0mA 1
Collector-base breakdown voltage V(BR)CBO -60 V IC=-50uA, IE=0 1
Collector-emitter breakdown voltage V(BR)CEO -50 V IC=-1.0mA, IB=0 1
Emitter-base breakdown voltage V(BR)EBO -6 V IE=-50μA, IC=0 1
Collector cut-off current ICBO -0.1 uA VCB=-60V, IE=0 1
Emitter cut-off current IEBO -0.1 μA VEB=-6V, IC=0 1
Collector-emitter saturation voltage VCE(sat) -0.5 V IC=-50mA, IB=-5.0mA; pulse test PW≤300us, D.C≤2% 1
Base-emitter saturation voltage VBE(sat) -1.2 V IC=-50mA, IB=-5.0mA; pulse test PW≤300us, D.C≤2% 1
Transition frequency fT 140 MHz VCE=-12V, IC=-2.0mA, f=30MHZ 1
Collector output capacitance Cob 3.5 5 pF VCB=-12V, IE=0, f=1MHz 1
Collector-base voltage VCBO -60 V 1
Collector-emitter voltage VCEO -50 V 1
Emitter-base voltage VEBO -6 V 1
Collector current, continuous IC -150 mA 1
Collector power dissipation PC 150 mW 1
Operation junction and storage temperature range TJ,Tstg -55 150 ℃ 1

CAD (KiCad official)

  • Symbol: 2SA1774
  • Footprint: Package_TO_SOT_SMD:SOT-523
  • 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: 2sa1774-etched.step / 2sa1774-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 2sa1774.step / 2sa1774.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (4 pp, sha256 a4f334fa3e0f6afb, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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