# TCZM4747ATR

**Tak Cheong** · Zener Diodes · LL-41

TCZM4747ATR from Tak Cheong, in a LL-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 color band (negative polarity); the TCZM4747A zener voltage is 20 V nominal at IZT = 12.5 mA. |
| 2 | A | passive | Anode terminal; the device dissipates 1.0 W total with a maximum junction temperature of +175 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Tak Cheong |
| Package | LL-41 |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `TCZM4747ATR`
- Footprint: `Diode_SMD:D_MELF`
- 3D model: LL-41 (KiCad packages3D, STEP)

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Tak Cheong datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588902613785567232) (3 pp, sha256 `7bb75ebdfa147e19`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/tczm4747atr-datasheet.pdf)