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ZMM5237BPF

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ST Semtech Zener Diodes, LL-34. 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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ZMM5237BPF

ST Semtech · Zener Diodes · LL-34

ZMM5237BPF from ST Semtech, in a LL-34. 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 LL-34
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), tested at IZT VZT 7.79 8.61 V at IZT = 20 mA; tested with pulses tp = 20 ms 4
Dynamic resistance ZZT ZZT 8 Ω at IZT = 20 mA 4
Dynamic resistance ZZK ZZK 500 Ω at IZK = 0.25 mA 4
Reverse current IR 3 µA at VR = 6.5 V 4
Forward voltage VF 1.1 V at IF = 200 mA 4
Zener voltage tolerance (suffix B, ±5%) -5 5 % Suffix B for ±5% tolerance 1
Nominal zener voltage VZnom 8.2 V 4
Power dissipation Ptot 500 mW electrodes kept at ambient temperature (note 1) 1
Junction temperature Tj 175 ℃ 1
Storage temperature range Tstg -65 175 ℃ 1
Thermal resistance junction to ambient RθJA 300 ℃/W electrodes kept at ambient temperature (note 1) 1

CAD (KiCad official)

  • Symbol: ZMM5237BPF
  • Footprint: Diode_SMD:D_MiniMELF
  • 3D model: LL-34 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: ST Semtech datasheet (6 pp, sha256 3a203cb42731a600, 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