component
1N4749A-TR
Public Made by Adomby adom
Vishay Intertech Zener Diodes, DO-204AL(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.
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1N4749A-TR
Vishay Intertech · Zener Diodes · DO-204AL(DO-41)
1N4749A-TR from Vishay Intertech, in a DO-204AL(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 | Vishay Intertech |
| Package | DO-204AL(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 |
|---|---|---|---|---|---|---|---|
| Reverse leakage current at VR | IR | 5 | μA | at VR = 18.2 V | 2 | ||
| Dynamic resistance (Zener impedance) | ZZT | 25 | Ω | f = 1 kHz, at IZT1 = 10.5 mA | 2 | ||
| Dynamic resistance (knee impedance) | ZZK | 750 | Ω | f = 1 kHz, at IZT2 = 0.25 mA | 2 | ||
| Surge current | IR | 190 | mA | tp = 10 ms | 2 | ||
| Regulator current | IZM | 38 | mA | Valid provided electrodes at a distance of 4 mm from case are kept at ambient temperature | 2 | ||
| Forward voltage | VF | 1.2 | V | IF = 200 mA | 1 | ||
| Power dissipation | Ptot | 1300 | mW | Leads at a distance of 4 mm from case kept at ambient temperature | 1 | ||
| Thermal resistance junction to ambient air | RthJA | 110 | K/W | Leads at a distance of 4 mm from case kept at ambient temperature | 1 | ||
| Junction temperature | Tj | 175 | °C | 1 | |||
| Storage temperature range | Tstg | -65 | 175 | °C | 1 | ||
| Zener voltage (nominal) | VZ | 24 | V | at IZT1 = 10.5 mA | 2 | ||
| Zener voltage tolerance | -5 | 5 | % | Standard Zener voltage tolerance | 1 |
CAD (KiCad official)
- Symbol:
1N4749A-TR - Footprint:
Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal - 3D model: DO-204AL(DO-41) (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Vishay Intertech datasheet (4 pp, sha256
33369d6dd0299505, 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).
# 1N4749A-TR
**Vishay Intertech** · Zener Diodes · DO-204AL(DO-41)
1N4749A-TR from Vishay Intertech, in a DO-204AL(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 | Vishay Intertech |
| Package | DO-204AL(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 |
|---|---|---|---|---|---|---|---|
| Reverse leakage current at VR | IR | | | 5 | μA | at VR = 18.2 V | 2 |
| Dynamic resistance (Zener impedance) | ZZT | | | 25 | Ω | f = 1 kHz, at IZT1 = 10.5 mA | 2 |
| Dynamic resistance (knee impedance) | ZZK | | | 750 | Ω | f = 1 kHz, at IZT2 = 0.25 mA | 2 |
| Surge current | IR | | | 190 | mA | tp = 10 ms | 2 |
| Regulator current | IZM | | | 38 | mA | Valid provided electrodes at a distance of 4 mm from case are kept at ambient temperature | 2 |
| Forward voltage | VF | | | 1.2 | V | IF = 200 mA | 1 |
| Power dissipation | Ptot | | | 1300 | mW | Leads at a distance of 4 mm from case kept at ambient temperature | 1 |
| Thermal resistance junction to ambient air | RthJA | | | 110 | K/W | Leads at a distance of 4 mm from case kept at ambient temperature | 1 |
| Junction temperature | Tj | | | 175 | °C | | 1 |
| Storage temperature range | Tstg | -65 | | 175 | °C | | 1 |
| Zener voltage (nominal) | VZ | | 24 | | V | at IZT1 = 10.5 mA | 2 |
| Zener voltage tolerance | | -5 | | 5 | % | Standard Zener voltage tolerance | 1 |
## CAD (KiCad official)
- Symbol: `1N4749A-TR`
- Footprint: `Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal`
- 3D model: DO-204AL(DO-41) (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Vishay Intertech datasheet](docs/1n4749a-tr-datasheet.pdf) (4 pp, sha256 `33369d6dd0299505`, 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/1n4749a-tr-datasheet.pdf)