component
1N4747A
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Taiwan Semiconductor 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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1N4747A
Taiwan Semiconductor · Zener Diodes · DO-204AL(DO-41)
1N4747A from Taiwan Semiconductor, 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 | Taiwan Semiconductor |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal 20 V) | VZ | 19 | 20 | 21 | V | @ IZT = 12.5 mA | 2 |
| Zener voltage tolerance (A suffix) | -5 | 5 | % | A suffix, standard ±5% (Note 1) | 3 | ||
| Zener impedance | ZZT | 22 | Ω | @ IZT = 12.5 mA, 60 Hz AC at 10% of IZT (Note 4) | 2 | ||
| Zener impedance at knee | ZZK | 750 | Ω | @ IZK = 0.25 mA | 2 | ||
| Leakage current | IR | 5 | μA | @ VR = 15.2 V | 2 | ||
| Power dissipation | Ptot | 1 | W | @ TA = 50°C | 1 | ||
| Derating above 50°C | 6.67 | mW/°C | Above 50°C, mounted on Cu-pad 5mm x 5mm (Note 1) | 1 | |||
| Operating junction temperature range | TJ | -55 | 150 | °C | 1 | ||
| Storage temperature range | TSTG | -55 | 150 | °C | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | ● Terminal: Pure tin plated leads, solderable per J-STD-002 ● Meet JESD 201 class 2 whisker test | 1 |
CAD (KiCad official)
- Symbol:
1N4747A - 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: Taiwan Semiconductor datasheet (8 pp, sha256
95c7c95b89d1d4ac, retrieved 2026-10-16, 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).
# 1N4747A
**Taiwan Semiconductor** · Zener Diodes · DO-204AL(DO-41)
1N4747A from Taiwan Semiconductor, 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 | Taiwan Semiconductor |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal 20 V) | VZ | 19 | 20 | 21 | V | @ IZT = 12.5 mA | 2 |
| Zener voltage tolerance (A suffix) | | -5 | | 5 | % | A suffix, standard ±5% (Note 1) | 3 |
| Zener impedance | ZZT | | | 22 | Ω | @ IZT = 12.5 mA, 60 Hz AC at 10% of IZT (Note 4) | 2 |
| Zener impedance at knee | ZZK | | | 750 | Ω | @ IZK = 0.25 mA | 2 |
| Leakage current | IR | | | 5 | μA | @ VR = 15.2 V | 2 |
| Power dissipation | Ptot | | | 1 | W | @ TA = 50°C | 1 |
| Derating above 50°C | | | 6.67 | | mW/°C | Above 50°C, mounted on Cu-pad 5mm x 5mm (Note 1) | 1 |
| Operating junction temperature range | TJ | -55 | | 150 | °C | | 1 |
| Storage temperature range | TSTG | -55 | | 150 | °C | | 1 |
## Materials and finish
As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | | tin | ● Terminal: Pure tin plated leads, solderable per J-STD-002 ● Meet JESD 201 class 2 whisker test | 1 |
## CAD (KiCad official)
- Symbol: `1N4747A`
- 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:** [Taiwan Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590334676046155776) (8 pp, sha256 `95c7c95b89d1d4ac`, retrieved 2026-10-16, tier: lcsc)
- **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/1n4747a-datasheet.pdf)