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MMSZ5231BT1G-CN

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

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MMSZ5231BT1G-CN

ChipNobo · Zener Diodes · SOD-123

MMSZ5231BT1G-CN from ChipNobo, 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 by the colour band; the Zener voltage is 4.85 V min to 5.36 V max at Izt = 20 mA.
2 A passive Anode; forward voltage is 0.9 V at IF = 10 mA, and power dissipation is limited to 500 mW.

Key specifications

Parameter Value
Manufacturer ChipNobo
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 (min) Vz1(@Izt) 4.85 V Izt = 20 mA 1
Zener voltage (max) Vz1(@Izt) 5.36 V Izt = 20 mA 1
Zener dynamic impedance (max) Zzt@Izt 17 Ω Izt = 20 mA 1
Zener knee impedance (max) Zzk 1600 Ω Izk = 0.25 mA 1
Reverse leakage current (max) IR 5 uA VR = 2.0 V 1
Power dissipation Pd 500 mW Device mounted on ceramic PCB 7.6mm x 9.4mm x 0.87mm with pad areas 25mm² 1
Storage temperature range Ts -65 150 ℃ 1
Forward voltage Vf 0.9 V @IF=10mA 1
Thermal resistance, junction-to-ambient RθJA 340 ℃/W Device mounted on ceramic PCB 7.6mm x 9.4mm x 0.87mm with pad areas 25mm²; measured via infrared scan method 1
Thermal resistance, junction-to-lead RθJL 150 ℃/W 1

CAD (KiCad official)

  • Symbol: MMSZ5231BT1G-CN
  • Footprint: Diode_SMD:D_SOD-123F
  • 3D model: SOD-123 (KiCad packages3D, STEP)
  • 3D model files: mmsz5231bt1g-cn-etched.step / mmsz5231bt1g-cn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mmsz5231bt1g-cn.step / mmsz5231bt1g-cn.glb are the bare package body.

Provenance

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

  • Datasheet: ChipNobo datasheet (3 pp, sha256 f6915f822f2dd1c7, 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