component
ZM4745A
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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ZM4745A
ST(Semtech) · Zener Diodes · LL-41
ZM4745A 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 |
|---|---|---|---|---|---|---|---|
| Power Dissipation | Ptot | 1 | W | Valid provided electrodes kept at ambient temperature (note 1) | 1 | ||
| Junction Temperature | Tj | 175 | ℃ | 1 | |||
| Storage Temperature Range | Tstg | -65 | 175 | ℃ | 1 | ||
| Thermal Resistance Junction to Ambient Air | RθJA | 170 | K/W | Valid provided electrodes kept at ambient temperature (note 1) | 1 | ||
| Forward Voltage | VF | 1.2 | V | at IF = 200 mA | 1 | ||
| Dynamic Resistance | ZZT | 16 | Ω | at IZT = 15.5 mA | 2 | ||
| Dynamic Resistance (knee) | ZZK | 700 | Ω | at IZK = 0.25 mA | 2 | ||
| Reverse Current | IR | 5 | µA | at VR = 12.2 V | 2 | ||
| Maximum Regulator Current | IZM | 57 | mA | at Ta = 25℃ (note 2) | 2 | ||
| Maximum Surge Current | IZSM | 285 | mA | Maximum peak non-repetitive reverse surge, 1/2 square or sine wave, 1/120 s, superimposed on IZT (note 4) | 2 | ||
| Zener Voltage Tolerance (suffix A, ±5%) | -5 | 5 | % | Suffix A: ±5% Zener voltage tolerance | 1 | ||
| Zener Voltage (nominal) | VZnom | 16 | V | at IZT = 15.5 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4745A - 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
ff41c4dbf24547f7, retrieved 2026-10-21, tier: manufacturer) - 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).
# ZM4745A
**ST(Semtech)** · Zener Diodes · LL-41
ZM4745A 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 |
|---|---|---|---|---|---|---|---|
| Power Dissipation | Ptot | | | 1 | W | Valid provided electrodes kept at ambient temperature (note 1) | 1 |
| Junction Temperature | Tj | | | 175 | ℃ | | 1 |
| Storage Temperature Range | Tstg | -65 | | 175 | ℃ | | 1 |
| Thermal Resistance Junction to Ambient Air | RθJA | | | 170 | K/W | Valid provided electrodes kept at ambient temperature (note 1) | 1 |
| Forward Voltage | VF | | | 1.2 | V | at IF = 200 mA | 1 |
| Dynamic Resistance | ZZT | | | 16 | Ω | at IZT = 15.5 mA | 2 |
| Dynamic Resistance (knee) | ZZK | | | 700 | Ω | at IZK = 0.25 mA | 2 |
| Reverse Current | IR | | | 5 | µA | at VR = 12.2 V | 2 |
| Maximum Regulator Current | IZM | | | 57 | mA | at Ta = 25℃ (note 2) | 2 |
| Maximum Surge Current | IZSM | | | 285 | mA | Maximum peak non-repetitive reverse surge, 1/2 square or sine wave, 1/120 s, superimposed on IZT (note 4) | 2 |
| Zener Voltage Tolerance (suffix A, ±5%) | | -5 | | 5 | % | Suffix A: ±5% Zener voltage tolerance | 1 |
| Zener Voltage (nominal) | VZnom | | 16 | | V | at IZT = 15.5 mA | 2 |
## CAD (KiCad official)
- Symbol: `ZM4745A`
- 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](docs/zm4745a-datasheet.pdf) (3 pp, sha256 `ff41c4dbf24547f7`, retrieved 2026-10-21, tier: manufacturer)
- **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/zm4745a-datasheet.pdf)