component

BD438S

Public Made by Adom

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onsemi Bipolar Transistors - BJT, TO-126-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componenttransistorsbd438sfactory-2.0.0extractor-text

Verified BD438S

by Ray · last 30 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier lcsc, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: BD438S · TO-126-3 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 5-page datasheet
  • ✓distributor: lcsc C900822, digikey BD438S-ND, mouser 512-BD438S
  • ✓family: TO-126-3_Vertical
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-gzopdq9i/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): the datasheet dimensions give no height or body size to compare (datasheet p.4)
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ bd438s.kicad_sym✓ bd438s.kicad_mod✓ bd438s.step
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

markdown

BD438S

onsemi · Bipolar Transistors - BJT · TO-126-3

BD438S from onsemi, in a TO-126-3. 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 Emitter passive Emitter terminal of this PNP transistor, assigned to pin 1 of the TO-126 package (the pin marked #1 on the package drawing).
2 Collector passive Collector terminal of this PNP transistor, assigned to pin 2 of the TO-126 package; the collector-emitter and collector-base voltage limits for BD438 are listed in the absolute maximum ratings.
3 Base passive Base terminal of this PNP transistor, assigned to pin 3 of the TO-126 package; the base current limit is 1 A (DC) per the absolute maximum ratings.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-126-3
Category Transistors
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-Emitter Sustaining Voltage (BD438) VCEO(sus) -45 V IC = -100mA, IB = 0 2
Collector Cut-off Current (BD438) ICBO -100 µA VCB = -45V, IE = 0 2
Emitter Cut-off Current IEBO -1 mA VEB = -5V, IC = 0 2
DC Current Gain (BD438) hFE 30 VCE = -5V, IC = -10mA 2
DC Current Gain (ALL DEVICE) hFE 85 VCE = -1V, IC = -500mA 2
DC Current Gain (BD438) hFE 40 VCE = -1V, IC = -2A 2
Collector-Emitter Saturation Voltage (BD438) VCE(sat) -0.6 V IC = -2A, IB = -0.2A 2
Base-Emitter ON Voltage (BD438) VBE(on) -1.2 V VCE = -1V, IC = -2A 2
Current Gain Bandwidth Product fT 3 MHz VCE = -1V, IC = -250mA 2
Collector-Base Voltage (BD438) VCBO -45 V 1
Collector-Emitter Voltage (BD438) VCES -45 V 1
Emitter-Base Voltage VEBO -5 V 1
Collector Current (DC) IC -4 A 1
Collector Current (Pulse) ICP -7 A Pulsed 1
Base Current IB -1 A 1
Collector Dissipation PC 36 W TC = 25°C 1
Junction Temperature TJ 150 °C 1
Storage Temperature TSTG -65 150 °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 IB Base Current - 1 A PC Collector Dissipation (TC=25°C) 36 W 1

CAD (KiCad official)

  • Symbol: BD438S
  • Footprint: Package_TO_SOT_THT:TO-126-3_Vertical
  • 3D model: TO-126-3 (KiCad packages3D, STEP)
  • 3D model files: bd438s-etched.step / bd438s-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bd438s.step / bd438s.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (5 pp, sha256 80dc9f9b4564a08b, retrieved 2026-10-30, 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