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1N4745APF-M
Public Made by Adomby adom
ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, 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
markdown1N4745APF-M
ST(Semtech) · Zener Diodes · DO-41
1N4745APF-M from ST(Semtech), in a DO-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, marked by the cathode band on the DO-41 glass case; Zener breakdown (regulating) voltage is developed with this terminal positive, e.g. 15.2 to 16.8 V at IZT = 15.5 mA for the 1N4745A. |
| 2 | A | passive | Anode terminal of the DO-41 axial glass case (opposite end from the cathode band); forward voltage max 1.2 V at IF = 200 mA, power dissipation 1 W. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ST(Semtech) |
| Package | DO-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 Range | VZ | 15.2 | 16 | 16.8 | V | at IZT = 15.5 mA, Ta = 25℃, tp = 20 ms | 2 |
| 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 Surge Current | IZSM | 285 | mA | 1/2 square wave or equivalent sine wave pulse of 1/120 second | 2 | ||
| Maximum Regulator Current | IZM | 57 | mA | leads at 8 mm from case kept at ambient temperature | 2 | ||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA | 2 | ||
| Zener Test Current | IZT | 15.5 | mA | Ta = 25℃ | 2 | ||
| Temperature Coefficient | 0.055 | 0.09 | %/°C | as printed: 0.055 to 0.09 | 2 | ||
| Power Dissipation | Ptot | 1 | W | Ta = 25℃; leads at 8 mm from case kept at ambient temperature | 1 | ||
| Junction Temperature | Tj | 175 | ℃ | Ta = 25℃ | 1 | ||
| Storage Temperature Range | Tstg | -65 | 175 | ℃ | Ta = 25℃ | 1 | |
| Thermal Resistance Junction to Ambient | RθJA | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature | 1 |
CAD (KiCad official)
- Symbol:
1N4745APF-M - Footprint:
Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal - 3D model: DO-41 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ST(Semtech) datasheet (3 pp, sha256
4b0aaf964c54ea10, retrieved 2026-10-23, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(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).