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MMSZ5254BQ-7-F

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

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MMSZ5254BQ-7-F

Diodes Incorporated · Zener Diodes · SOD-123

MMSZ5254BQ-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 end marked with the cathode band; it goes positive for Zener breakdown (27V nominal, 25.65V to 28.35V at 5.0mA for the MMSZ5254B).
2 A passive Anode, the end opposite the cathode band; forward voltage is 0.9V at IF = 10mA.

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 (nominal 27 V, type code K4) VZ 25.65 27 28.35 V @ IZT = 5.0 mA 2
Maximum Zener Impedance (ZZT) ZZT 41 Ω f = 1KHz, IZT = 5.0 mA 2
Maximum Zener Impedance (ZZK) ZZK 600 Ω IZK = 0.25 mA 2
Maximum Reverse Leakage Current IR 0.1 µA VR = 21 V 2
Forward Voltage VF 0.9 V IF = 10mA 2
Power Dissipation (Note 4) PD 500 mW TL = +75°C 2
Power Dissipation (Note 5) PD 370 mW TA = +25°C 2
Thermal Resistance, Junction to Ambient Air (Note 5) RθJA 338 °C/W Device mounted on ceramic PCB with copper pad areas 40mm2 2
Thermal Resistance, Junction to Lead (Note 4) RθJL 132 °C/W 2
Operating and Storage Temperature Range TJ, TSTG -65 150 °C 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: MMSZ5254BQ-7-F
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5254bq-7-f-etched.step / mmsz5254bq-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5254bq-7-f.step / mmsz5254bq-7-f.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (6 pp, sha256 1fea20eb263b98e4, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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