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MMSZ5257B-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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MMSZ5257B-7-F

Diodes Incorporated · Zener Diodes · SOD-123

MMSZ5257B-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 terminal marked by the cathode band; it goes positive in reverse (Zener) breakdown, and the 33V part (MMSZ5257B) has VZ 31.35V to 34.65V at IZT = 3.8mA.
2 A passive Anode, the terminal 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 (Nom 33 V, Min 31.35 V, Max 34.65 V) VZ 31.35 33 34.65 V @ IZT = 3.8mA 2
Maximum Zener impedance ZZT 58 Ω @ IZT = 3.8mA, f = 1KHz 2
Maximum Zener impedance ZZK 700 Ω @ IZK = 0.25mA, f = 1KHz 2
Maximum reverse leakage current IR 0.1 A @ VR = 25V 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
Forward voltage VF 0.9 V @ IF = 10mA 2
Thermal resistance, junction to ambient air RθJA 338 °C/W (Note 5) 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: MMSZ5257B-7-F
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5257b-7-f-etched.step / mmsz5257b-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5257b-7-f.step / mmsz5257b-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 2026-10-17, 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