component
ZM4731APF-M
Public Made by Adomby adom
ST Semtech 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.
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ZM4731APF-M
ST Semtech · Zener Diodes · LL-41
ZM4731APF-M from ST Semtech, 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 | ST Semtech |
| 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 that electrodes are kept at ambient temperature | 1 | ||
| Junction Temperature | Tj | 175 | °C | 1 | |||
| Storage Temperature Range | TS | -65 | 175 | °C | 1 | ||
| Thermal Resistance, Junction to Ambient Air | RthA | 170 | K/W | Valid provided that electrodes are kept at ambient temperature | 1 | ||
| Forward Voltage | VF | 1.2 | V | at IF = 200 mA; Tamb = 25°C | 1 | ||
| Zener voltage tolerance (suffix A) | VZ | -5 | 5 | % | Suffix A = ±5% tolerance | 1 | |
| Maximum Zener Impedance | ZZT | 9 | Ω | at IZT = 58 mA | 2 | ||
| Maximum Zener Impedance | ZZK | 400 | Ω | at IZK = 1 mA | 2 | ||
| Maximum reverse leakage current | IR | 50 | μA | at VR = 1 V | 2 | ||
| Surge current | 1070 | mA | Tested with pulses tp = 20 ms (footnote 4) | 2 | |||
| Maximum regulator current | IZM | 217 | mA | TA = 25°C; valid provided that electrodes are kept at ambient temperature | 2 | ||
| Nominal Zener voltage | VZ | 4.3 | V | at IZT = 58 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4731APF-M - Footprint:
Diode_SMD:D_MELF - 3D model: LL-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST Semtech datasheet (3 pp, sha256
260d3c825d457f5e, retrieved 2026-10-14, 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).
# ZM4731APF-M
**ST Semtech** · Zener Diodes · LL-41
ZM4731APF-M from ST Semtech, 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 | ST Semtech |
| 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 that electrodes are kept at ambient temperature | 1 |
| Junction Temperature | Tj | | | 175 | °C | | 1 |
| Storage Temperature Range | TS | -65 | | 175 | °C | | 1 |
| Thermal Resistance, Junction to Ambient Air | RthA | | | 170 | K/W | Valid provided that electrodes are kept at ambient temperature | 1 |
| Forward Voltage | VF | | | 1.2 | V | at IF = 200 mA; Tamb = 25°C | 1 |
| Zener voltage tolerance (suffix A) | VZ | -5 | | 5 | % | Suffix A = ±5% tolerance | 1 |
| Maximum Zener Impedance | ZZT | | | 9 | Ω | at IZT = 58 mA | 2 |
| Maximum Zener Impedance | ZZK | | | 400 | Ω | at IZK = 1 mA | 2 |
| Maximum reverse leakage current | IR | | | 50 | μA | at VR = 1 V | 2 |
| Surge current | | | | 1070 | mA | Tested with pulses tp = 20 ms (footnote 4) | 2 |
| Maximum regulator current | IZM | | | 217 | mA | TA = 25°C; valid provided that electrodes are kept at ambient temperature | 2 |
| Nominal Zener voltage | VZ | | 4.3 | | V | at IZT = 58 mA | 2 |
## CAD (KiCad official)
- Symbol: `ZM4731APF-M`
- Footprint: `Diode_SMD:D_MELF`
- 3D model: LL-41 (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602999409282203648) (3 pp, sha256 `260d3c825d457f5e`, retrieved 2026-10-14, 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](docs/zm4731apf-m-datasheet.pdf)