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MM1Z5251B

Public Made by Adom

by adom

ST(Semtech) Zener Diodes, SOD-123. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MM1Z5251B

ST(Semtech) · Zener Diodes · SOD-123

MM1Z5251B from ST(Semtech), in a SOD-123. 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 Cathode passive Cathode terminal of the Zener diode, as listed in the PINNING table for the SOD-123 package.
2 Anode passive Anode terminal of the Zener diode, as listed in the PINNING table for the SOD-123 package.

Key specifications

Parameter Value
Manufacturer ST(Semtech)
Package SOD-123
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 (min) VZT 20.9 V at IZT = 5.6 mA, pulsed 20 ms 2
Zener voltage (max) VZT 23.1 V at IZT = 5.6 mA, pulsed 20 ms 2
Zener dynamic impedance (max) ZZT 29 Ω at IZT = 5.6 mA 2
Zener dynamic impedance knee (max) ZZK 600 Ω at IZK = 0.25 mA 2
Reverse current (max) IR 0.1 µA at VR = 17 V 2
Forward voltage (max) VF 0.9 V at IF = 10 mA 1
Nominal Zener voltage Vznom 22 V 2
Zener voltage tolerance -5 5 % approximately ±5% 1
Total power dissipation Ptot 500 mW Ta = 25℃ 1
Junction temperature Tj 150 ℃ 1
Storage temperature range TStg -55 150 ℃ 1
Thermal resistance junction to ambient air RθJA 350 ℃/W 1

CAD (KiCad official)

  • Symbol: MM1Z5251B
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mm1z5251b-etched.step / mm1z5251b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm1z5251b.step / mm1z5251b.glb are the bare package body.

Provenance

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

  • Datasheet: ST(Semtech) datasheet (4 pp, sha256 a80b873003c5c24a, retrieved 2026-10-27, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), 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