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1N4737APF-M

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ST Semtech Zener Diodes, DO-41. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.

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1N4737APF-M

ST Semtech · Zener Diodes · DO-41

1N4737APF-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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

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 (nominal 7.5 V) VZ 7.12 7.5 7.88 V at IZT = 34 mA; DC test, thermal equilibrium 2
Maximum Zener impedance rZJT 4 Ω at IZT = 34 mA; 60 Hz AC at 10% of IZT rms 2
Maximum Zener impedance (knee) rZJK 700 Ω at IZK = 0.5 mA 2
Maximum reverse leakage current IR 10 µA at VR = 5 V 2
Maximum surge current IZSM 605 mA peak non-repetitive reverse surge, 1/120 s half sine superimposed on IZT (note 4) 2
Maximum regulator current IZM 121 mA 2
Forward voltage VF 1.2 V at IF = 200 mA 1
Power dissipation Ptot 1 W valid provided leads at 8 mm from case are kept at ambient temperature 1
Junction temperature Tj 200 °C 1
Storage temperature range TS -65 200 °C 1
Thermal resistance junction to ambient air RthA 170 K/W valid provided leads at 8 mm from case are kept at ambient temperature 1

CAD (KiCad official)

  • Symbol: 1N4737APF-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 (4 pp, sha256 b4504508e5b23338, retrieved 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary cathode-band convention (convention), consensus off (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