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1N4731APF-M
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ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N4731APF-M
ST(Semtech) · Zener Diodes · DO-41
1N4731APF-M 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 end marked with the cathode band; positive for zener breakdown, with Vz 4.08…4.52 V (4.3 V nom.) at IZT = 58 mA for the 1N4731APF. |
| 2 | A | passive | Anode, the end opposite the cathode band; forward voltage max 1.2 V at IF = 200 mA, with total power dissipation of 1 W. |
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 Range | VZ | 4.08 | 4.3 | 4.52 | V | at IZT = 58 mA, Ta = 25℃, tp = 20 ms | 2 |
| Dynamic Resistance | ZZT | 9 | Ω | at IZT = 58 mA | 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 | 2 | |||
| Maximum Regulator Current | IZM | 217 | mA | leads at 8 mm from case kept at ambient temperature | 2 | ||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA | 2 | ||
| Temperature Coefficient of Zener Voltage | -0.07 | -0.01 | %/°C | 2 | |||
| Power Dissipation | Ptot | 1 | W | Ta = 25℃; leads at 8 mm from case kept at ambient temperature | 1 | ||
| Junction Temperature | Tj | 175 | ℃ | Ta = 25℃ | 1 | ||
| Storage Temperature Range | Tstg | -65 | 175 | ℃ | Ta = 25℃ | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature | 1 |
CAD (KiCad official)
- Symbol:
1N4731APF-M - 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 (3 pp, sha256
4b0aaf964c54ea10, retrieved 2026-10-23, 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).
# 1N4731APF-M
**ST(Semtech)** · Zener Diodes · DO-41
1N4731APF-M 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 end marked with the cathode band; positive for zener breakdown, with Vz 4.08…4.52 V (4.3 V nom.) at IZT = 58 mA for the 1N4731APF. |
| 2 | A | passive | Anode, the end opposite the cathode band; forward voltage max 1.2 V at IF = 200 mA, with total power dissipation of 1 W. |
## 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 Range | VZ | 4.08 | 4.3 | 4.52 | V | at IZT = 58 mA, Ta = 25℃, tp = 20 ms | 2 |
| Dynamic Resistance | ZZT | | | 9 | Ω | at IZT = 58 mA | 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 | | 2 |
| Maximum Regulator Current | IZM | | | 217 | mA | leads at 8 mm from case kept at ambient temperature | 2 |
| Forward Voltage | VF | | | 1.2 | V | IF = 200 mA | 2 |
| Temperature Coefficient of Zener Voltage | | -0.07 | | -0.01 | %/°C | | 2 |
| Power Dissipation | Ptot | | | 1 | W | Ta = 25℃; leads at 8 mm from case kept at ambient temperature | 1 |
| Junction Temperature | Tj | | | 175 | ℃ | Ta = 25℃ | 1 |
| Storage Temperature Range | Tstg | -65 | | 175 | ℃ | Ta = 25℃ | 1 |
| Thermal Resistance Junction to Ambient | RθJA | | | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature | 1 |
## CAD (KiCad official)
- Symbol: `1N4731APF-M`
- 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](docs/1n4731apf-m-datasheet.pdf) (3 pp, sha256 `4b0aaf964c54ea10`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/1n4731apf-m-datasheet.pdf)