component
ZM4739APF-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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ZM4739APF-M
ST Semtech · Zener Diodes · LL-41
ZM4739APF-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 | 8.65 | 9.56 | V | at IZT = 28 mA; tested with pulses tp = 20 ms | 3 | |
| Dynamic resistance at IZT | ZZT | 5 | Ω | at IZT = 28 mA | 3 | ||
| Dynamic resistance at IZK | ZZK | 700 | Ω | at IZK = 0.5 mA | 3 | ||
| Reverse current | IR | 10 | µA | at VR = 7 V | 3 | ||
| Maximum surge current | IZSM | 500 | mA | max peak non-repetitive reverse surge, 1/2 square or sine wave pulse of 1/120 s superimposed on IZT | 3 | ||
| Maximum regulator current | IZM | 100 | mA | Ta = 25℃; valid provided electrodes kept at ambient temperature | 3 | ||
| Power dissipation | Ptot | 1 | W | Ta = 25℃; valid provided electrodes kept at ambient temperature | 1 | ||
| Junction temperature | Tj | 175 | ℃ | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | ℃ | 1 | ||
| Thermal resistance junction to ambient | RθJA | 150 | ℃/W | valid provided electrodes kept at ambient temperature | 1 | ||
| Zener voltage tolerance (suffix A, ±5%) | -5 | 5 | % | suffix A denotes ±5% tolerance on VZnom | 1 | ||
| Nominal Zener voltage | VZnom | 9.1 | V | 3 |
CAD (KiCad official)
- Symbol:
ZM4739APF-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 2026-10-16, 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).
# ZM4739APF-M
**ST Semtech** · Zener Diodes · LL-41
ZM4739APF-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 | 8.65 | | 9.56 | V | at IZT = 28 mA; tested with pulses tp = 20 ms | 3 |
| Dynamic resistance at IZT | ZZT | | | 5 | Ω | at IZT = 28 mA | 3 |
| Dynamic resistance at IZK | ZZK | | | 700 | Ω | at IZK = 0.5 mA | 3 |
| Reverse current | IR | | | 10 | µA | at VR = 7 V | 3 |
| Maximum surge current | IZSM | | | 500 | mA | max peak non-repetitive reverse surge, 1/2 square or sine wave pulse of 1/120 s superimposed on IZT | 3 |
| Maximum regulator current | IZM | | | 100 | mA | Ta = 25℃; valid provided electrodes kept at ambient temperature | 3 |
| Power dissipation | Ptot | | | 1 | W | Ta = 25℃; valid provided electrodes kept at ambient temperature | 1 |
| Junction temperature | Tj | | | 175 | ℃ | | 1 |
| Storage temperature range | Tstg | -65 | | 175 | ℃ | | 1 |
| Thermal resistance junction to ambient | RθJA | | | 150 | ℃/W | valid provided electrodes kept at ambient temperature | 1 |
| Zener voltage tolerance (suffix A, ±5%) | | -5 | | 5 | % | suffix A denotes ±5% tolerance on VZnom | 1 |
| Nominal Zener voltage | VZnom | | 9.1 | | V | | 3 |
## CAD (KiCad official)
- Symbol: `ZM4739APF-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/8602989854116626432) (5 pp, sha256 `52c5e9326019cc3d`, retrieved 2026-10-16, 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/zm4739apf-m-datasheet.pdf)