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MMSZ5255B-7-F

Public Made by Adom

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Diodes Incorporated Zener Diodes, SOD-123. 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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MMSZ5255B-7-F

Diodes Incorporated · Zener Diodes · SOD-123

MMSZ5255B-7-F from Diodes Incorporated, 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 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 Diodes Incorporated
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 VZ 26.6 28 29.4 V @ IZT = 4.5 mA 2
Maximum Zener Impedance ZZT 44 Ω f = 1KHz; @ IZT = 4.5 mA 2
Maximum Zener Impedance (knee) ZZK 600 Ω f = 1KHz; @ IZK = 0.25 mA 2
Maximum Reverse Leakage Current IR 0.1 A @ VR = 21 V 2
Power Dissipation PD 500 mW @ TL = +75°C (Note 4) 2
Power Dissipation PD 370 mW @ TA = +25°C (Note 5) 2
Operating and Storage Temperature Range TJ, TSTG -65 150 °C 2
Thermal Resistance, Junction to Ambient Air RθJA 338 °C/W (Note 5) FR-4 PCB, 1 inch copper pad 2
Thermal Resistance, Junction to Lead RθJL 132 °C/W (Note 4) 2

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin  Terminals: Matte Tin Finish Annealed over Alloy 42 Leadframe (Lead Free Plating). Solderable per MIL-STD-202, Method 208 1

CAD (KiCad official)

  • Symbol: MMSZ5255B-7-F
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5255b-7-f-etched.step / mmsz5255b-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5255b-7-f.step / mmsz5255b-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (5 pp, sha256 7c7ac7a58521db27, retrieved 2026-10-19, 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