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1N4729APF-M

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

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1N4729APF-M

ST(Semtech) · Zener Diodes · DO-41

1N4729APF-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; Zener voltage 3.42…3.78 V at IZT = 69 mA for the 1N4729APF.
2 A passive Anode, the lead opposite the cathode band on the DO-41 glass case; maximum forward voltage 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 3.42 3.6 3.78 V at IZT = 69 mA, Ta = 25℃, pulses tp = 20 ms 2
Dynamic Resistance ZZT 10 Ω at IZT = 69 mA 2
Dynamic Resistance (knee) ZZK 400 Ω at IZK = 1 mA 2
Reverse Current IR 100 µA at VR = 1 V 2
Maximum Surge Current IZSM 1260 mA 2
Maximum Regulator Current IZM 252 mA leads at 8 mm from case kept at ambient temperature 2
Temperature coefficient -0.08 -0.05 %/°C 2
Forward Voltage VF 1.2 V at IF = 200 mA, Ta = 25℃ 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 ℃ 1
Thermal Resistance Junction to Ambient RθJA 150 ℃/W leads at 8 mm from case kept at ambient temperature 1

CAD (KiCad official)

  • Symbol: 1N4729APF-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 2026-10-22, 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