component
ZM4731A
Public Made by Adomby adom
YFW Zener Diodes, LL-41. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, 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
markdownZM4731A
YFW · Zener Diodes · LL-41
ZM4731A from YFW, in a LL-41. 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 | YFW |
| Package | LL-41 |
| 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 |
|---|---|---|---|---|---|---|---|
| Power dissipation | Ptot | 1 | W | Valid provided electrodes kept at ambient temperature | 1 | ||
| Junction temperature | Tj | 175 | °C | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | °C | 1 | ||
| Thermal resistance junction to ambient air | RθJA | 170 | K/W | Electrodes kept at ambient temperature | 1 | ||
| Forward voltage | VF | 1.2 | V | IF = 200 mA | 1 | ||
| Zener voltage tolerance (suffix A) | 5 | % | Suffix A; datasheet prints +5% only | 1 | |||
| Dynamic resistance | ZZT | 9 | Ω | At IZT = 58 mA; 60 Hz AC at 10% of IZT | 2 | ||
| Dynamic resistance (knee) | ZZK | 400 | Ω | At IZK = 1 mA | 2 | ||
| Reverse current | IR | 50 | µA | At VR = 1 V | 2 | ||
| Maximum surge current | IZSM | 1070 | mA | Non-repetitive 1/120 s surge pulse superimposed on IZT (footnote 4) | 2 | ||
| Maximum regulator current | IZM | 217 | mA | Ta = 25 °C | 2 | ||
| Zener voltage (nominal) | VZnom | 4.3 | V | At IZT = 58 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4731A - Footprint:
Diode_SMD:D_MELF - 3D model: LL-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: YFW datasheet (3 pp, sha256
ce3cb652985a1703, retrieved 2026-10-15, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).