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1N5231BPF

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ST Semtech Zener Diodes, DO-35. 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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1N5231BPF

ST Semtech · Zener Diodes · DO-35

1N5231BPF from ST Semtech, in a DO-35. 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-35
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 (VZT) at IZT VZT 4.85 5.1 5.35 V IZT = 20 mA; tested with pulses tp = 20 ms 2
Dynamic resistance ZZT 17 Ω at IZT = 20 mA 2
Dynamic resistance at knee ZZK 1600 Ω at IZK = 0.25 mA 2
Reverse current IR 5 µA at VR = 2 V 2
Temperature coefficient of Zener voltage TKVZ -0.03 0.03 %/K 2
Zener voltage tolerance (suffix B) -5 5 % Suffix B = ±5% tolerance 1
Forward voltage VF 1.1 V at IF = 200 mA 1
Power dissipation Ptot 500 mW Valid provided leads kept at ambient temperature at 8 mm from case 1
Junction temperature Tj 200 °C 1
Storage temperature range Tstg -65 200 °C 1
Thermal resistance junction to ambient air RθJA 0.3 K/mW Valid provided leads kept at ambient temperature at 8 mm from case 1

CAD (KiCad official)

  • Symbol: 1N5231BPF
  • Footprint: Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal
  • 3D model: DO-35 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: ST Semtech datasheet (3 pp, sha256 31e7ca5738ce26b3, 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