component

MMSZ5253B

Public Made by Adom

by adom

Changjing 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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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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MMSZ5253B

Changjing · Zener Diodes · SOD-123

MMSZ5253B 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint.
2 A passive Anode.

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 VZ 23.75 25 26.25 V IZT = 5.0 mA 2
Maximum Zener impedance ZZT 35 Ω @ IZT = 5.0 mA 2
Maximum Zener impedance ZZK 600 Ω @ IZK = 0.25 mA 2
Maximum reverse current IR 0.1 uA VR = 19 V 2
Power dissipation Pd 500 mW Note 1: mounted on 1 in² FR-4 board, 2oz copper, still air, Ta = 25 °C 1
Thermal resistance, junction to ambient air RθJA 250 ℃/W Note 1: mounted on 1 in² FR-4 board, 2oz copper, still air, Ta = 25 °C 1
Operation junction and storage temperature range TJ,Tstg -55 150 ℃ 1
Forward voltage VF 0.9 V @ IF = 10 mA; Note 2: tested with pulses, Tp ≤ 1.0 ms 1

CAD (KiCad official)

  • Symbol: MMSZ5253B
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5253b-etched.step / mmsz5253b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5253b.step / mmsz5253b.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (5 pp, sha256 9985aa0e7763364f, retrieved 2026-10-18, 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