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BST39TA

Public Made by Adom

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Diodes Incorporated Bipolar (BJT), SOT-89. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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BST39TA

Diodes Incorporated · Bipolar (BJT) · SOT-89

BST39TA from Diodes Incorporated, in a SOT-89. 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 input Base of the NPN transistor; the datasheet gives VEBO of 7 V and VCE(sat) of 0.5 V max at IC = 50 mA, IB = 4 mA.
2 C passive Collector, the centre lead, which is also the exposed collector tab; the datasheet gives VCEO of 350 V, VCBO of 400 V, IC of 500 mA continuous and ICM of 1 A peak.
3 E passive Emitter of the NPN transistor; the datasheet gives VEBO of 7 V maximum.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-89
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 400 V IC = 100µA 4
Collector-Emitter Breakdown Voltage BVCEO 350 V IC = 1mA 4
Emitter-Base Breakdown Voltage BVEBO 7 V IE = 100µA 4
Collector Cutoff Current ICBO 20 nA VCB = 300V 4
DC Current Transfer Static Ratio hFE 40 IC = 20mA, VCE = 10V 4
Collector-Emitter Saturation Voltage VCE(sat) 0.5 V IC = 50mA, IB = 4mA 4
Base-Emitter Saturation Voltage VBE(sat) 1.3 V IC = 50mA, IB = 4mA 4
Transition Frequency fT 70 MHz IC = 10mA, VCE = 10V, f = 5MHz 4
Output Capacitance Cobo 2 pF VCB = 10V, f = 1MHz, IE = 0 4
Input Capacitance Cibo 20 pF VEB = 10V, f = 1MHz, IC = 0 4
Collector-Base Voltage VCBO 400 V @TA = +25°C 2
Collector-Emitter Voltage VCEO 350 V @TA = +25°C 2
Emitter-Base Voltage VEBO 7 V @TA = +25°C 2
Continuous Collector Current IC 500 mA @TA = +25°C 2
Peak Pulse Current ICM 1 A @TA = +25°C 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Power Dissipation (Note 5) PD 1 W @TA = +25°C; 15mm x 15mm 1oz copper, FR4 single-sided 1.6mm 2
Power Dissipation (Note 6) PD 1.5 W @TA = +25°C; 25mm x 25mm 1oz copper 2
Power Dissipation (Note 7) PD 2 W @TA = +25°C; 50mm x 50mm 1oz copper 2
Thermal Resistance, Junction to Ambient Air (Note 5) RθJA 125 °C/W @TA = +25°C; 15mm x 15mm 1oz copper, still air 2
Thermal Resistance, Junction to Ambient Air (Note 6) RθJA 83 °C/W @TA = +25°C; 25mm x 25mm 1oz copper, still air 2
Thermal Resistance, Junction to Ambient Air (Note 7) RθJA 60 °C/W @TA = +25°C; 50mm x 50mm 1oz copper, still air 2
Thermal Resistance, Junction to Lead (Note 8) RθJL 22 °C/W Junction to solder-point on exposed collector pad 2
Thermal Resistance, Junction to Case (Note 9) RθJC 16 °C/W Junction to top of case 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: BST39TA
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: bst39ta-etched.step / bst39ta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bst39ta.step / bst39ta.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 46f4313971ba2f91, retrieved 2026-10-19, 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