component
ZM4739A-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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ZM4739A-M
ST Semtech · Zener Diodes · LL-41
ZM4739A-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 tolerance (suffix A) | VZnom | -5 | 5 | % | Suffix A = ±5% for the ZM4739A-M variant; standard ±10% | 1 | |
| Dynamic resistance (Zener impedance at IZT) | ZZT | 5 | Ω | at IZT = 28 mA; 60 Hz AC at 10% of IZT superimposed (note 1) | 2 | ||
| Dynamic resistance (knee impedance at IZK) | ZZK | 700 | Ω | at IZK = 0.5 mA | 2 | ||
| Reverse current | IR | 10 | µA | at VR = 7 V | 2 | ||
| Maximum surge current (non-repetitive peak) | IZSM | 500 | mA | 1/120 s half-sine pulse superimposed on IZT (note 4) | 2 | ||
| Maximum regulator current | IZM | 100 | mA | 2 | |||
| Power dissipation | Ptot | 1 | W | Valid provided electrodes are kept at ambient temperature (note 1) | 1 | ||
| Junction temperature | Tj | 175 | °C | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | °C | 1 | ||
| Thermal resistance junction to ambient air | RθJA | 170 | K/W | Valid provided electrodes are kept at ambient temperature (note 1) | 1 | ||
| Forward voltage | VF | 1.2 | V | at IF = 200 mA | 1 | ||
| Nominal Zener voltage | VZnom | 9.1 | V | at IZT = 28 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4739A-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
7e85ace0c1a5dd15, 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).
# ZM4739A-M
**ST Semtech** · Zener Diodes · LL-41
ZM4739A-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 tolerance (suffix A) | VZnom | -5 | | 5 | % | Suffix A = ±5% for the ZM4739A-M variant; standard ±10% | 1 |
| Dynamic resistance (Zener impedance at IZT) | ZZT | | | 5 | Ω | at IZT = 28 mA; 60 Hz AC at 10% of IZT superimposed (note 1) | 2 |
| Dynamic resistance (knee impedance at IZK) | ZZK | | | 700 | Ω | at IZK = 0.5 mA | 2 |
| Reverse current | IR | | | 10 | µA | at VR = 7 V | 2 |
| Maximum surge current (non-repetitive peak) | IZSM | | | 500 | mA | 1/120 s half-sine pulse superimposed on IZT (note 4) | 2 |
| Maximum regulator current | IZM | | | 100 | mA | | 2 |
| Power dissipation | Ptot | | | 1 | W | Valid provided electrodes are kept at ambient temperature (note 1) | 1 |
| Junction temperature | Tj | | | 175 | °C | | 1 |
| Storage temperature range | Tstg | -65 | | 175 | °C | | 1 |
| Thermal resistance junction to ambient air | RθJA | | | 170 | K/W | Valid provided electrodes are kept at ambient temperature (note 1) | 1 |
| Forward voltage | VF | | | 1.2 | V | at IF = 200 mA | 1 |
| Nominal Zener voltage | VZnom | | 9.1 | | V | at IZT = 28 mA | 2 |
## CAD (KiCad official)
- Symbol: `ZM4739A-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/8590208402216685568) (3 pp, sha256 `7e85ace0c1a5dd15`, 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/zm4739a-m-datasheet.pdf)