component
1N4731APF
Public Made by Adomby adom
ST Semtech Zener Diodes, DO-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
markdown1N4731APF
ST Semtech · Zener Diodes · DO-41
1N4731APF from ST Semtech, in a DO-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 | ST Semtech |
| Package | DO-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 |
|---|---|---|---|---|---|---|---|
| Zener voltage, minimum (1N4731APF, ±5% suffix A) | VZT | 4.09 | V | at IZT = 58 mA | 3 | ||
| Zener voltage, maximum (1N4731APF, ±5% suffix A) | VZT | 4.52 | V | at IZT = 58 mA | 3 | ||
| Nominal Zener voltage | VZnom | 4.3 | V | 3 | |||
| Zener voltage tolerance (suffix A) | -5 | 5 | % | suffix A: ±5% (standard ±10%) | 1 | ||
| Dynamic resistance, maximum | ZZT | 9 | Ω | at IZT = 58 mA, 60 Hz AC at 10% of IZT (footnote 1) | 3 | ||
| Dynamic resistance at knee, maximum | ZZK | 400 | Ω | at IZK = 1 mA | 3 | ||
| Reverse current, maximum | IR | 50 | µA | at VR = 1 V | 3 | ||
| Maximum surge current | IZSM | 1070 | mA | peak non-repetitive 1/120 s pulse superimposed on IZT (footnote 4) | 3 | ||
| Maximum regulator current | IZM | 217 | mA | 3 | |||
| Temperature coefficient, minimum | -0.07 | %/℃ | 3 | ||||
| Temperature coefficient, maximum | -0.01 | %/℃ | 3 | ||||
| Forward voltage, maximum | VF | 1.2 | V | at IF = 200 mA | 2 | ||
| Power dissipation, absolute maximum | Ptot | 1 | W | leads at 8 mm from case kept at ambient temperature (footnote 1) | 1 | ||
| Junction temperature, absolute maximum | Tj | 175 | ℃ | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | ℃ | 1 | ||
| Thermal resistance, junction to ambient air | RθJA | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature (footnote 1) | 1 |
CAD (KiCad official)
- Symbol:
1N4731APF - Footprint:
Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal - 3D model: DO-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (5 pp, sha256
dd71dcfee8108242, 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).