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AC857BQ-7

Public Made by Adom

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

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AC857BQ-7

Diodes Incorporated · Bipolar (BJT) · SOT-23

AC857BQ-7 from Diodes Incorporated, 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 B passive Base terminal of the PNP transistor; peak base current is limited to IBM = -200 mA.
2 E passive Emitter terminal; peak emitter current is limited to IEM = -200 mA and emitter-base voltage to VEBO = -5.0 V.
3 C passive Collector terminal; collector-emitter voltage is limited to VCEO = -45 V, continuous collector current to IC = -100 mA and peak collector current to ICM = -200 mA.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
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-Base Breakdown Voltage BVCBO -50 V IC = -10µA 4
Collector-Emitter Breakdown Voltage BVCEO -45 V IC = -10mA 4
Emitter-Base Breakdown Voltage BVEBO -5 V IE = -1µA 4
Collector Cutoff Current ICBO -15 nA VCB = -30V 4
Collector Cutoff Current ICBO -4 µA VCB = -30V, TJ = +150°C 4
Collector Emitter Cutoff Current ICES -15 nA VCE = -50V 4
Emitter-Base Cutoff Current IEBO -100 nA VEB = -5V 4
DC Current Gain (AC857BQ) hFE 220 290 475 IC = -2.0mA, VCE = -5V 4
Collector-Emitter Saturation Voltage VCE(SAT) -75 -300 mV IC = - 10mA, IB = -0.5mA 4
Collector-Emitter Saturation Voltage VCE(SAT) -250 -650 mV IC = - 100mA, IB = -5.0mA 4
Base-Emitter Turn-On Voltage VBE(ON) -600 -650 -750 mV IC = -2mA, VCE = -5V 4
Base-Emitter Turn-On Voltage VBE(ON) -820 mV IC = -10mA, VCE = -5V 4
Base-Emitter Saturation Voltage VBE(SAT) -850 -1100 mV IC = -100mA, IB = -5mA 4
Transition Frequency fT 100 200 MHz VCE = -5V, IC = -10mA, f = 100MHz 4
Noise Figure NF 2 10 dB VCE = -5V, IC = -200µA, RS = 2kΩ, f = 1kHz, Δf = 200Hz 4
Collector-Base Voltage VCBO -50 V TA = +25°C 2
Collector-Emitter Voltage VCEO -45 V TA = +25°C 2
Emitter-Base Voltage VEBO -5 V TA = +25°C 2
Continuous Collector Current IC -100 mA TA = +25°C 2
Peak Collector Current ICM -200 mA TA = +25°C 2
Peak Emitter Current IEM -200 mA TA = +25°C 2
Peak Base Current IBM -200 mA TA = +25°C 2
Operating and Storage Temperature Range TJ,TSTG -65 150 °C 2
Power Dissipation PD 310 mW Note 6: minimum recommended pad layout, 1oz copper, single-sided FR-4, still air 2
Power Dissipation PD 350 mW Note 7: 15mm x 15mm 1oz copper 2
Thermal Resistance, Junction to Ambient RθJA 403 °C/W Note 6: minimum recommended pad layout, 1oz copper 2
Thermal Resistance, Junction to Ambient RθJA 357 °C/W Note 7: 15mm x 15mm 1oz copper 2
Thermal Resistance, Junction to Leads RθJL 350 °C/W Note 8: junction to solder-point at end of leads 2

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
contacts tin  Terminals: Finish, Matte Tin Plated Leads, Solderable per MIL-STD-202, Method 208 1

CAD (KiCad official)

  • Symbol: AC857BQ-7
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: ac857bq-7-etched.step / ac857bq-7-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ac857bq-7.step / ac857bq-7.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 a5a7b46226fc89a5, 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