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ZMM5251BPF

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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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ZMM5251BPF

ST Semtech · Zener Diodes · LL-34

ZMM5251BPF 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, minimum (±5% grade, suffix B) VZT 20.9 V at IZT = 5.6 mA, tp = 20 ms 4
Zener voltage, maximum (±5% grade, suffix B) VZT 23.1 V at IZT = 5.6 mA, tp = 20 ms 4
Dynamic resistance, maximum ZZT 29 Ω at IZT = 5.6 mA 4
Dynamic resistance at knee, maximum ZZK 600 Ω at IZK = 0.25 mA 4
Reverse current, maximum IR 0.1 µA at VR = 17 V 4
Forward voltage, maximum VF 1.1 V at IF = 200 mA 2
Zener voltage tolerance (suffix B) -5 5 % suffix B denotes ±5% tolerance 1
Power dissipation, maximum Ptot 500 mW Ta = 25℃; valid provided electrodes kept at ambient temperature 1
Junction temperature, maximum Tj 175 ℃ 1
Storage temperature range Tstg -65 175 ℃ 1
Thermal resistance, junction to ambient, maximum RθJA 300 ℃/W electrodes kept at ambient temperature 1

CAD (KiCad official)

  • Symbol: ZMM5251BPF
  • 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