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BCX54TA

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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BCX54TA

Diodes Incorporated · Bipolar (BJT) · SOT-89

BCX54TA 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 terminal of the NPN transistor; continuous base current is limited to 100 mA and peak pulse base current to 200 mA (absolute maximum ratings, page 2).
2 C passive Collector, also the exposed collector pad used for heat sinking; continuous collector current is limited to 1 A and peak pulse to 2 A, with VCEO of 45 V, 60 V or 80 V depending on the BCX54/55/56 type (page 2).
3 E passive Emitter terminal; emitter-base voltage VEBO is limited to 6 V (page 2).

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 (BCX54) BVCBO 45 V IC = 100µA 4
Collector-Emitter Breakdown Voltage (BCX54, Note 12) BVCEO 45 V IC = 10mA 4
Emitter-Base Breakdown Voltage BVEBO 6 V IE = 100µA 4
Collector Cutoff Current ICBO 0.1 µA VCB = 30V 4
Collector Cutoff Current ICBO 20 µA VCB = 30V, TA = +150°C 4
Emitter Cutoff Current IEBO 20 nA VEB = 5V 4
Static Forward Current Transfer Ratio (All versions) hFE 25 IC = 5mA, VCE = 2V 4
Static Forward Current Transfer Ratio (All versions) hFE 40 IC = 150mA, VCE = 2V 4
Collector-Emitter Saturation Voltage (Note 12) VCE(sat) 0.5 V IC = 500mA, IB = 50mA 4
Base-Emitter Turn-On Voltage (Note 12) VBE(on) 1 V IC = 500mA, VCE = 2V 4
Transition Frequency fT 150 MHz IC = 50mA, VCE = 10V, f = 100MHz 4
Output Capacitance Cobo 25 pF VCB = 10V, f = 1MHz 4
Collector-Base Voltage VCBO 45 V BCX54 column 2
Collector-Emitter Voltage VCEO 45 V BCX54 column 2
Emitter-Base Voltage VEBO 6 V 2
Continuous Collector Current IC 1 A 2
Peak Pulse Collector Current ICM 2 A 2
Continuous Base Current IB 100 mA 2
Peak Pulse Base Current IBM 200 mA 2
Operating and Storage Temperature Range TJ, TSTG -55 150 °C 2
Electrostatic Discharge - Human Body Model ESD HBM 4000 V JEDEC Class 3A (Note 11) 2
Electrostatic Discharge - Machine Model ESD MM 400 V JEDEC Class C (Note 11) 2
Power Dissipation PD 0.55 W Note 5: minimum recommended pad layout, 1oz Cu 2
Power Dissipation PD 1 W Note 6: 15mm x 15mm 1oz Cu 2
Power Dissipation PD 1.5 W Note 7: 25mm x 25mm 1oz Cu 2
Power Dissipation PD 2 W Note 8: 50mm x 50mm 1oz Cu 2
Thermal Resistance, Junction to Ambient Air RθJA 225 °C/W Note 5: minimum recommended pad layout, 1oz Cu 2
Thermal Resistance, Junction to Ambient Air RθJA 125 °C/W Note 6: 15mm x 15mm 1oz Cu 2
Thermal Resistance, Junction to Ambient Air RθJA 83 °C/W Note 7: 25mm x 25mm 1oz Cu 2
Thermal Resistance, Junction to Ambient Air RθJA 60 °C/W Note 8: 50mm x 50mm 1oz Cu 2
Thermal Resistance, Junction to Lead RθJL 13 °C/W Note 9: junction to solder-point on exposed collector pad 2
Thermal Resistance, Junction to Case RθJC 39 °C/W Notes 5 & 10 2
Thermal Resistance, Junction to Case RθJC 27 °C/W Note 10: 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: Matte Tin Finish Leads. Solderable per MIL-STD-202 Method 208 1

CAD (KiCad official)

  • Symbol: BCX54TA
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89 (KiCad packages3D, STEP)
  • 3D model files: bcx54ta-etched.step / bcx54ta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bcx54ta.step / bcx54ta.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 f1fb713b16b386bf, 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