component
ZM4740APF
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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownZM4740APF
ST Semtech · Zener Diodes · LL-41
ZM4740APF 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) | -5 | 5 | % | Suffix A = ±5% tolerance on VZnom | 1 | ||
| Dynamic resistance | ZZT | 7 | Ω | at IZT = 25 mA | 2 | ||
| Dynamic resistance | ZZK | 700 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse current | IR | 10 | µA | at VR = 7.6 V | 2 | ||
| Forward voltage | VF | 1.2 | V | at IF = 200 mA | 2 | ||
| Maximum surge current | IZSM | 454 | mA | Maximum peak, non-repetitive reverse surge current, 1/2 square wave or sine pulse of 1/120 s superimposed on IZT | 2 | ||
| Maximum regulator current | IZM | 91 | mA | Valid provided electrodes are kept at ambient temperature | 2 | ||
| Power dissipation | Ptot | 1 | W | Valid provided electrodes are 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 are kept at ambient temperature | 1 | ||
| Zener voltage (nominal) | VZnom | 10 | V | at IZT = 25 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4740APF - 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).