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ZM4741APF
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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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ZM4741APF
ST Semtech · Zener Diodes · LL-41
ZM4741APF 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 (standard, no suffix) | -10 | 10 | % | Standard ±10 %; suffix A (±5 %) and B (±2 %) not applicable to ZM4741PF | 1 | ||
| Dynamic resistance | ZZT | 8 | Ω | at IZT = 23 mA | 2 | ||
| Dynamic resistance (knee) | ZZK | 700 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse current | IR | 5 | µA | at VR = 8.4 V | 2 | ||
| Maximum surge current | IZSM | 414 | mA | 1/120 s surge pulse superimposed on IZT | 2 | ||
| Maximum regulator current | IZM | 83 | mA | Ta = 25℃ | 2 | ||
| Maximum forward voltage | VF | 1.2 | V | at IF = 200 mA | 2 | ||
| Power dissipation | Ptot | 1 | W | 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 | Electrodes kept at ambient temperature | 1 | ||
| Zener voltage (nominal) | VZnom | 11 | V | at IZT = 23 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4741APF - 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
dad3f74512c9fc19, 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).
# ZM4741APF
**ST Semtech** · Zener Diodes · LL-41
ZM4741APF 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 (standard, no suffix) | | -10 | | 10 | % | Standard ±10 %; suffix A (±5 %) and B (±2 %) not applicable to ZM4741PF | 1 |
| Dynamic resistance | ZZT | | | 8 | Ω | at IZT = 23 mA | 2 |
| Dynamic resistance (knee) | ZZK | | | 700 | Ω | at IZK = 0.25 mA | 2 |
| Reverse current | IR | | | 5 | µA | at VR = 8.4 V | 2 |
| Maximum surge current | IZSM | | | 414 | mA | 1/120 s surge pulse superimposed on IZT | 2 |
| Maximum regulator current | IZM | | | 83 | mA | Ta = 25℃ | 2 |
| Maximum forward voltage | VF | | | 1.2 | V | at IF = 200 mA | 2 |
| Power dissipation | Ptot | | | 1 | W | 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 | Electrodes kept at ambient temperature | 1 |
| Zener voltage (nominal) | VZnom | | 11 | | V | at IZT = 23 mA | 2 |
## CAD (KiCad official)
- Symbol: `ZM4741APF`
- 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/8603368648165629952) (3 pp, sha256 `dad3f74512c9fc19`, 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/zm4741apf-datasheet.pdf)