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1N4749APF
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ST(Semtech) Zener Diodes, DO-41. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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1N4749APF
ST(Semtech) · Zener Diodes · DO-41
1N4749APF 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 glass DO-41 case; for 1N4749APF the zener voltage is 24 V nominal (22.8 to 25.2 V) at IZT = 10.5 mA. |
| 2 | A | passive | Anode terminal of the zener diode, the end opposite the cathode band; the datasheet gives VF max 1.2 V at IF = 200 mA. |
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 | VZT | 22.8 | 24 | 25.2 | V | at IZT = 10.5 mA, tp = 20 ms, Ta = 25℃ | 3 |
| Zener Test Current | IZT | 10.5 | mA | Ta = 25℃ | 3 | ||
| Dynamic Resistance | ZZT | 25 | Ω | at IZT = 10.5 mA | 3 | ||
| Dynamic Resistance (knee) | ZZK | 750 | Ω | at IZK = 0.25 mA | 3 | ||
| Reverse Current | IR | 5 | µA | at VR = 18.2 V | 3 | ||
| Maximum Surge Current | IZSM | 190 | mA | 1/2 square wave or equivalent sine wave, 1/120 s, superimposed on IZT | 3 | ||
| Maximum Regulator Current | IZM | 38 | mA | leads at 8 mm from case kept at ambient temperature | 3 | ||
| Temperature Coefficient of Zener Voltage | 0.06 | 0.095 | %/℃ | at IZT | 3 | ||
| Forward Voltage | VF | 1.2 | V | IF = 200 mA | 3 | ||
| Zener Voltage Tolerance | -5 | 5 | % | suffix A | 1 | ||
| 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 Air | RθJA | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature | 1 |
CAD (KiCad official)
- Symbol:
1N4749APF - 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 2026-10-27, 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).
# 1N4749APF
**ST(Semtech)** · Zener Diodes · DO-41
1N4749APF 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 glass DO-41 case; for 1N4749APF the zener voltage is 24 V nominal (22.8 to 25.2 V) at IZT = 10.5 mA. |
| 2 | A | passive | Anode terminal of the zener diode, the end opposite the cathode band; the datasheet gives VF max 1.2 V at IF = 200 mA. |
## 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 | VZT | 22.8 | 24 | 25.2 | V | at IZT = 10.5 mA, tp = 20 ms, Ta = 25℃ | 3 |
| Zener Test Current | IZT | | 10.5 | | mA | Ta = 25℃ | 3 |
| Dynamic Resistance | ZZT | | | 25 | Ω | at IZT = 10.5 mA | 3 |
| Dynamic Resistance (knee) | ZZK | | | 750 | Ω | at IZK = 0.25 mA | 3 |
| Reverse Current | IR | | | 5 | µA | at VR = 18.2 V | 3 |
| Maximum Surge Current | IZSM | | | 190 | mA | 1/2 square wave or equivalent sine wave, 1/120 s, superimposed on IZT | 3 |
| Maximum Regulator Current | IZM | | | 38 | mA | leads at 8 mm from case kept at ambient temperature | 3 |
| Temperature Coefficient of Zener Voltage | | 0.06 | | 0.095 | %/℃ | at IZT | 3 |
| Forward Voltage | VF | | | 1.2 | V | IF = 200 mA | 3 |
| Zener Voltage Tolerance | | -5 | | 5 | % | suffix A | 1 |
| 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 Air | RθJA | | | 150 | ℃/W | leads at 8 mm from case kept at ambient temperature | 1 |
## CAD (KiCad official)
- Symbol: `1N4749APF`
- 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](docs/1n4749apf-datasheet.pdf) (5 pp, sha256 `dd71dcfee8108242`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-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).
[Datasheet PDF](docs/1n4749apf-datasheet.pdf)