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MMSZ5259B-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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MMSZ5259B-7-F

Diodes Incorporated · Zener Diodes · SOD-123

MMSZ5259B-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, marked by the cathode band on the package; the Zener (39V nominal, 37.05V to 40.95V at IZT = 3.2mA) is reverse biased with the cathode positive.
2 A passive Anode; the diode is forward biased with VF of 0.9V at IF = 10mA when the anode is positive relative to the cathode.

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 37.05 39 40.95 V IZT = 3.2 mA, TA = +25°C 2
Maximum Zener Impedance ZZT 80 Ω @ IZT = 3.2 mA, f = 1KHz 2
Maximum Zener Impedance (knee) ZZK 800 Ω @ IZK = 0.25mA, f = 1KHz 2
Maximum Reverse Leakage Current IR 0.1 µA @ VR = 30 V 2
Power Dissipation PD 500 mW @TL = +75°C 2
Power Dissipation PD 370 mW @TA = +25°C, device mounted on FR-4 PCB with 1 inch copper pad layout 2
Thermal Resistance, Junction to Ambient Air RθJA 338 °C/W Device mounted on FR-4 PCB with 1 inch copper pad layout 2
Thermal Resistance, Junction to Lead RθJL 132 °C/W 2
Operating and Storage Temperature Range TJ, TSTG -65 150 °C 2
Forward Voltage VF 0.9 V IF = 10mA, TA = +25°C 2
Nominal Zener Voltage VZ nom 39 V IZT = 3.2 mA 2
Test Current IZT 3.2 mA 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: MMSZ5259B-7-F
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5259b-7-f-etched.step / mmsz5259b-7-f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5259b-7-f.step / mmsz5259b-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 2026-10-23, tier: manufacturer)
  • 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