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MMSZ5240C

Public Made by Adom

by adom

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

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MMSZ5240C

Changjing · Zener Diodes · SOD-123

MMSZ5240C from Changjing, 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 '-' with the band on the body); the Zener breakdown voltage VZ is 10 V nominal (9.80 to 10.20 V) at IZT = 20 mA, and it conducts reverse current at VZ.
2 A passive Anode (marked '+' on the package drawing); forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW.

Key specifications

Parameter Value
Manufacturer Changjing
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 10 V, MMSZ5240C, code 2F5) VZ 9.8 10 10.2 V IZT = 20 mA 2
Maximum Zener impedance ZZT 17 Ω IZT = 20 mA 2
Maximum Zener impedance ZZK 600 Ω IZK = 0.25 mA 2
Maximum reverse current IR 3 µA VR = 8.0 V 2
Forward voltage VF 0.9 V IF = 10 mA; tested with pulses, Tp≤1.0 ms (Note 2) 1
Power dissipation Pd 500 mW Mounted on 1 in² FR-4 board, 2 oz copper, still air, Ta=25 ℃ (Note 1) 1
Operation junction and storage temperature range TJ,Tstg -55 150 ℃ 1
Thermal resistance junction to ambient air RθJA 250 ℃/W 1

CAD (KiCad official)

  • Symbol: MMSZ5240C
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5240c-etched.step / mmsz5240c-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5240c.step / mmsz5240c.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (5 pp, sha256 d0ee804c65052055, 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