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1N4738APF-M

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ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentdiodes1n4738apf-mfactory-2.0.0extractor-text

Verified 1N4738APF-M

by Ray · last 31 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

31 Oct 2026RayPublished by the parts factory: tier lcsc, 2 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: 1N4738APF-M · DO-41 · 2 pins
  • ✓copper: 2 copper pads, none touching another net
  • ✓datasheet: all 2 pin names found in the 3-page datasheet
  • •distributor (warn): no ['digikey', 'mouser'] number
  • ✓family: D_DO-41_SOD81_P10.16mm_Horizontal
  • ✓files: 6 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-bplmusuf/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 1 records
  • •package_fit (skip): the datasheet dimensions give no height or body size to compare (datasheet p.1)
  • ✓pads: 2 pins = 2 pads
  • ✓pose: 1 STEP(s) Z-up, seated, centred
  • ✓symbol: 2 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ 1n4738apf-m.kicad_sym✓ 1n4738apf-m.kicad_mod✓ 1n4738apf-m.step
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Contents

README

markdown

1N4738APF-M

ST(Semtech) · Zener Diodes · DO-41

1N4738APF-M from ST(Semtech), in a DO-41. 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 K passive Cathode, marked by the cathode band on the DO-41 glass case; the Zener diode is reverse-biased with this lead positive (1N4738A nominal Zener voltage 8.2 V at 31 mA).
2 A passive Anode lead of the DO-41 glass case (opposite the cathode band); forward voltage max 1.2 V at IF = 200 mA.

Key specifications

Parameter Value
Manufacturer ST(Semtech)
Package DO-41
Category Diodes
Pins 2

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Zener Voltage Range VZ 7.79 8.2 8.61 V at IZT = 31 mA, tp = 20 ms 2
Test Current IZT 31 mA Ta = 25℃ 2
Dynamic Resistance ZZT 4.5 Ω at IZT = 31 mA 2
Dynamic Resistance (knee) ZZK 700 Ω at IZK = 0.5 mA 2
Reverse Current IR 10 µA at VR = 6 V 2
Maximum Surge Current IZSM 550 mA 2
Maximum Regulator Current IZM 110 mA leads at 8 mm from case kept at ambient temperature 2
Forward Voltage VF 1.2 V IF = 200 mA 2
Temperature coefficient 0.03 0.07 %/°C 2
Power Dissipation Ptot 1 W Ta = 25℃, leads at 8 mm from case kept at ambient temperature 1
Junction Temperature Tj 175 ℃ Ta = 25℃ 1
Storage Temperature Range Tstg -65 175 ℃ Ta = 25℃ 1
Thermal Resistance Junction to Ambient RθJA 150 ℃/W leads at 8 mm from case kept at ambient temperature 1

CAD (KiCad official)

  • Symbol: 1N4738APF-M
  • Footprint: Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal
  • 3D model: DO-41 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: ST(Semtech) datasheet (3 pp, sha256 4b0aaf964c54ea10, retrieved 2026-10-31, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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