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MM1Z5253B

Public Made by Adom

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

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MM1Z5253B

ST Semtech · Zener Diodes · SOD-123

MM1Z5253B 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, listed as pin 1 in the PINNING table for the SOD-123 package (2-lead surface-mount, total power dissipation max. 500 mW for the device).
2 ANODE passive Anode terminal of the zener diode, listed as pin 2 in the PINNING table and shown on the top view of the SOD-123 outline (forward voltage VF max. 0.9 V at IF = 10 mA).

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, minimum VZT 23.75 V at IZT = 5 mA, pulsed 20 ms 2
Zener voltage, maximum VZT 26.25 V at IZT = 5 mA, pulsed 20 ms 2
Nominal zener voltage Vznom 25 V 2
Zener voltage tolerance -5 5 % approximately, per Features 1
Dynamic impedance, max ZZT 35 Ω at IZT = 5 mA 2
Dynamic impedance knee, max ZZK 600 Ω at IZK = 0.25 mA, AC 1 kHz, IZ(AC) = 0.1 IZ(DC) 2
Reverse current, max IR 0.1 µA at VR = 19 V 2
Forward voltage, max VF 0.9 V at IF = 10 mA 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: MM1Z5253B
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mm1z5253b-etched.step / mm1z5253b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm1z5253b.step / mm1z5253b.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 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (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