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MM3Z22B

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ST Semtech Zener Diodes, SOD-323. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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MM3Z22B

ST Semtech · Zener Diodes · SOD-323

MM3Z22B from ST Semtech, in a SOD-323. 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 of the zener diode, marked by the cathode line on the package; MM3ZB22 has VZT 21.56 to 22.44 V at IZT = 5 mA.
2 Anode passive Anode of the zener diode; the package power dissipation is 300 mW and the junction temperature range is -55 to +150 °C.

Key specifications

Parameter Value
Manufacturer ST Semtech
Package SOD-323
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 VZT 21.56 22 22.44 V at IZT = 5 mA, pulses 20 ms 2
Zener Voltage Tolerance -2 2 % 1
Dynamic Impedance ZZT 55 Ω at IZT = 5 mA 2
Reverse Leakage Current IR 0.1 μA at VR = 17 V 2
Forward Voltage VF 0.9 V IF = 10 mA 2
Total Power Dissipation Ptot 300 mW Ta = 25℃ 1
Operating Junction Temperature Range Tj -55 150 ℃ Ta = 25℃ 1
Storage Temperature Range Tstg -55 150 ℃ Ta = 25℃ 1
Thermal Resistance Junction to Ambient RθJA 417 ℃/W Device mounted on FR-4 substrate PC board, 2oz copper, minimum recommended pad layout 1

CAD (KiCad official)

  • Symbol: MM3Z22B
  • Footprint: Diode_SMD:D_SOD-323
  • 3D model: SOD-323 (KiCad packages3D, STEP)
  • 3D model files: mm3z22b-etched.step / mm3z22b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm3z22b.step / mm3z22b.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (4 pp, sha256 516fde18dd79a5a8, retrieved 2026-10-22, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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