component
SMF4758A
Public Made by Adomby adom
Changjing Zener Diodes, SOD-123FL. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSMF4758A
Changjing · Zener Diodes · SOD-123FL
SMF4758A from Changjing, in a SOD-123FL. 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, identified by the marking/cathode bar on the package; zener breakdown VZ is 53.20V nominal (50.54V-55.86V... see review) at IZT=4.5mA with reverse conduction through this pin. |
| 2 | A | passive | Anode of the zener diode; forward voltage VF is max 1.5V at IF=200mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOD-123FL |
| 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 minimum | VZ | 53.2 | 56 | 58.8 | V | @IZT = 4.5 mA | 2 |
| Test current | IZT | 4.5 | mA | 2 | |||
| Maximum Zener impedance | ZZT | 110 | Ω | @IZT | 2 | ||
| Maximum Zener impedance (knee) | ZZK | 2000 | Ω | @IZK = 0.25 mA | 2 | ||
| Reverse leakage current | IR | 0.1 | uA | @VR = 42.6 V | 2 | ||
| Maximum DC Zener current | IZM | 16 | mA | 2 | |||
| Maximum surge current | IRM | 80 | mApk | non-repetitive 8.3ms pulse | 2 | ||
| Forward voltage | VF | 1.5 | V | IF=200mA | 1 | ||
| Power dissipation | Pd | 1 | W | TL=75℃ | 1 | ||
| Junction and storage temperature range | TJ,Tstg | -55 | 150 | ℃ | 1 | ||
| Thermal resistance junction to ambient | RθJA | 170 | ℃/W | Between junction to ambient | 1 | ||
| Thermal resistance junction to lead | RθJL | 26 | ℃/W | Between junction to lead | 1 |
CAD (KiCad official)
- Symbol:
SMF4758A - Footprint:
Diode_SMD:D_SOD-123F - 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files:
smf4758a-etched.step/smf4758a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);smf4758a.step/smf4758a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (5 pp, sha256
8f6e4acc3701b115, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).