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1N4745APF-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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1N4745APF-M

ST(Semtech) · Zener Diodes · DO-41

1N4745APF-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 breakdown (regulating) voltage is developed with this terminal positive, e.g. 15.2 to 16.8 V at IZT = 15.5 mA for the 1N4745A.
2 A passive Anode terminal of the DO-41 axial glass case (opposite end from the cathode band); forward voltage max 1.2 V at IF = 200 mA, power dissipation 1 W.

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 15.2 16 16.8 V at IZT = 15.5 mA, Ta = 25℃, tp = 20 ms 2
Dynamic Resistance ZZT 16 Ω at IZT = 15.5 mA 2
Dynamic Resistance (knee) ZZK 700 Ω at IZK = 0.25 mA 2
Reverse Current IR 5 µA at VR = 12.2 V 2
Maximum Surge Current IZSM 285 mA 1/2 square wave or equivalent sine wave pulse of 1/120 second 2
Maximum Regulator Current IZM 57 mA leads at 8 mm from case kept at ambient temperature 2
Forward Voltage VF 1.2 V IF = 200 mA 2
Zener Test Current IZT 15.5 mA Ta = 25℃ 2
Temperature Coefficient 0.055 0.09 %/°C as printed: 0.055 to 0.09 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: 1N4745APF-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 2026-10-23, 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