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MM5Z27B

Public Made by Adom

by adom

ST Semtech Zener Diodes, SOT-523. 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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MM5Z27B

ST Semtech · Zener Diodes · SOT-523

MM5Z27B from ST Semtech, in a SOT-523. 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; the cathode line marking ('III') on the package identifies this end.
2 Anode passive Anode terminal of the Zener diode.
3 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer ST Semtech
Package SOT-523
Category Diodes
Pins 3

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 26.19 27.53 V IZT = 5 mA; VZ tested with pulses (20 ms) 2
Dynamic impedance ZZT 150 Ω IZT = 5 mA; measured with a very small AC current signal at IZ 2
Reverse leakage current IR 0.1 µA VR = 21 V 2
Forward voltage VF 0.9 V IF = 10 mA 2
Power dissipation Ptot 200 mW Ta = 25℃ 1
Junction temperature Tj 150 ℃ 1
Storage temperature range TStg -55 150 ℃ 1
Thermal resistance junction to ambient RθJA 625 ℃/W Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout 1

CAD (KiCad official)

  • Symbol: MM5Z27B
  • Footprint: Package_TO_SOT_SMD:SOT-523
  • 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
  • 3D model files: mm5z27b-etched.step / mm5z27b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mm5z27b.step / mm5z27b.glb are the bare package body.

Provenance

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

  • Datasheet: ST Semtech datasheet (4 pp, sha256 139f9352a078ea9c, retrieved 2026-10-17, 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