component
ZM4751APF-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.
main
ZM4751APF-M
ST Semtech · Zener Diodes · LL-41
ZM4751APF-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 |
|---|---|---|---|---|---|---|---|
| Zener voltage VZ (ZM4751APF, ±5% variant) | VZ | 28.5 | 31.5 | V | Ta = 25℃, at IZT = 8.5 mA; tested with pulses tp = 20 ms | 3 | |
| Zener voltage tolerance (suffix A) | -5 | 5 | % | Suffix A denotes ±5% tolerance | 1 | ||
| Dynamic resistance ZZT | ZZT | 40 | Ω | Ta = 25℃, at IZT = 8.5 mA; 60 Hz AC at 10% of IZT | 3 | ||
| Dynamic resistance ZZK | ZZK | 1000 | Ω | Ta = 25℃, at IZK = 0.25 mA; 60 Hz AC at 10% of IZK | 3 | ||
| Reverse current IR | IR | 5 | µA | Ta = 25℃, at VR = 22.8 V | 3 | ||
| Maximum surge current IZSM | IZSM | 150 | mA | Ta = 25℃; peak non-repetitive 1/2 square wave or sine pulse of 1/120 s superimposed on IZT | 3 | ||
| Maximum regulator current IZM | IZM | 30 | mA | Ta = 25℃; valid provided electrodes kept at ambient temperature | 3 | ||
| Power dissipation Ptot | Ptot | 1 | W | Ta = 25℃; valid provided electrodes kept at ambient temperature | 1 | ||
| Junction temperature Tj | Tj | 175 | ℃ | 1 | |||
| Storage temperature range Tstg | Tstg | -65 | 175 | ℃ | 1 | ||
| Thermal resistance junction to ambient RθJA | RθJA | 150 | ℃/W | Valid provided electrodes kept at ambient temperature | 1 | ||
| Nominal zener voltage VZnom | VZnom | 30 | V | 3 |
CAD (KiCad official)
- Symbol:
ZM4751APF-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 (5 pp, sha256
52c5e9326019cc3d, 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).
# ZM4751APF-M
**ST Semtech** · Zener Diodes · LL-41
ZM4751APF-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 |
|---|---|---|---|---|---|---|---|
| Zener voltage VZ (ZM4751APF, ±5% variant) | VZ | 28.5 | | 31.5 | V | Ta = 25℃, at IZT = 8.5 mA; tested with pulses tp = 20 ms | 3 |
| Zener voltage tolerance (suffix A) | | -5 | | 5 | % | Suffix A denotes ±5% tolerance | 1 |
| Dynamic resistance ZZT | ZZT | | | 40 | Ω | Ta = 25℃, at IZT = 8.5 mA; 60 Hz AC at 10% of IZT | 3 |
| Dynamic resistance ZZK | ZZK | | | 1000 | Ω | Ta = 25℃, at IZK = 0.25 mA; 60 Hz AC at 10% of IZK | 3 |
| Reverse current IR | IR | | | 5 | µA | Ta = 25℃, at VR = 22.8 V | 3 |
| Maximum surge current IZSM | IZSM | | | 150 | mA | Ta = 25℃; peak non-repetitive 1/2 square wave or sine pulse of 1/120 s superimposed on IZT | 3 |
| Maximum regulator current IZM | IZM | | | 30 | mA | Ta = 25℃; valid provided electrodes kept at ambient temperature | 3 |
| Power dissipation Ptot | Ptot | | | 1 | W | Ta = 25℃; valid provided electrodes kept at ambient temperature | 1 |
| Junction temperature Tj | Tj | | | 175 | ℃ | | 1 |
| Storage temperature range Tstg | Tstg | -65 | | 175 | ℃ | | 1 |
| Thermal resistance junction to ambient RθJA | RθJA | | | 150 | ℃/W | Valid provided electrodes kept at ambient temperature | 1 |
| Nominal zener voltage VZnom | VZnom | | 30 | | V | | 3 |
## CAD (KiCad official)
- Symbol: `ZM4751APF-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/8603098891206750208) (5 pp, sha256 `52c5e9326019cc3d`, retrieved 2026-10-15, 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/zm4751apf-m-datasheet.pdf)