component
1N4729APF
Public Made by Adomby adom
ST(Semtech) Zener Diodes, DO-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
markdown1N4729APF
ST(Semtech) · Zener Diodes · DO-41
1N4729APF 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: 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 | 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 (min) at IZT | VZT | 3.42 | V | at IZT 69 mA | 3 | ||
| Zener voltage (max) at IZT | VZT | 3.78 | V | at IZT 69 mA | 3 | ||
| Zener voltage tolerance (suffix A) | -5 | 5 | % | suffix A ±5% tolerance | 1 | ||
| Dynamic resistance (max) at IZT | ZZT | 10 | Ω | at IZT 69 mA | 3 | ||
| Dynamic resistance (max) at IZK | ZZK | 400 | Ω | at IZK 1 mA | 3 | ||
| Reverse current (max) | IR | 100 | µA | at VR 1 V | 3 | ||
| Maximum surge current (max) | IZSM | 1260 | mA | peak non-repetitive reverse surge, 1/120 s pulse superimposed on IZT (note 4) | 3 | ||
| Maximum regulator current (max) | IZM | 252 | mA | leads at 8 mm from case kept at ambient temperature (note 2) | 3 | ||
| Temperature coefficient (min) | -0.08 | %/℃ | 3 | ||||
| Temperature coefficient (max) | -0.05 | %/℃ | 3 | ||||
| Forward voltage (max) | VF | 1.2 | V | at IF 200 mA | 3 | ||
| Power dissipation (max) | Ptot | 1 | W | Ta = 25℃; leads at 8 mm from case kept at ambient temperature (note 1) | 1 | ||
| Junction temperature (max) | Tj | 175 | ℃ | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | ℃ | 1 | ||
| Thermal resistance junction to ambient air (max) | RθJA | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature (note 1) | 1 |
CAD (KiCad official)
- Symbol:
1N4729APF - 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 (5 pp, sha256
dd71dcfee8108242, retrieved 2026-10-28, 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).