component
DL4746A
Public Made by Adomby adom
LGE Zener Diodes, MELF. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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DL4746A
LGE · Zener Diodes · MELF
DL4746A from LGE, in a MELF. 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 MELF glass case; the zener diode is reverse-biased at this terminal for voltage regulation (DL4746A: VZ 18 V nominal at 14 mA test current, ±5% tolerance). |
| 2 | A | passive | Anode terminal of the MELF zener diode, opposite the cathode band; power dissipation up to 1.0 W at Tamb 50 °C with forward voltage max 1.2 V at IF=200 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | MELF |
| 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 tolerance (suffix A) | VZ | -5 | 5 | % | suffix A | 1 | |
| Forward voltage | VF | 1.2 | V | IF=200mA | 1 | ||
| Thermal resistance junction to ambient | RThJA | 170 | K/W | l=9.5mm (3/8"), TL=constant | 1 | ||
| Power dissipation | PDiss | 1 | W | Tamb 50 | 1 | ||
| Junction temperature | TJ | 175 | °C | 1 | |||
| Storage temperature range | Ts | -55 | 175 | °C | 1 | ||
| Maximum dynamic impedance | ZZT | 20 | Ω | @IZT | 2 | ||
| Maximum dynamic impedance (knee) | ZZK | 750 | Ω | @IZK=0.25 mA | 2 | ||
| Maximum reverse leakage current | IR | 5 | µA | VR=13.7 V, Tamb=25 | 2 | ||
| Maximum regulator current | IZM | 50 | mA | Tamb=50 | 2 | ||
| Max surge current | 250 | mA | 8.3ms | 2 | |||
| Nominal zener voltage | VZ | 18 | V | @IZT | 2 | ||
| Test current | IZT | 14 | mA | 2 |
CAD (KiCad official)
- Symbol:
DL4746A - Footprint:
Diode_SMD:D_MELF - 3D model: MELF (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LGE datasheet (3 pp, sha256
a224b6085d68189f, retrieved 2026-10-22, 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).
# DL4746A
**LGE** · Zener Diodes · MELF
DL4746A from LGE, in a MELF. 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 MELF glass case; the zener diode is reverse-biased at this terminal for voltage regulation (DL4746A: VZ 18 V nominal at 14 mA test current, ±5% tolerance). |
| 2 | A | passive | Anode terminal of the MELF zener diode, opposite the cathode band; power dissipation up to 1.0 W at Tamb 50 °C with forward voltage max 1.2 V at IF=200 mA. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | MELF |
| 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 tolerance (suffix A) | VZ | -5 | | 5 | % | suffix A | 1 |
| Forward voltage | VF | | | 1.2 | V | IF=200mA | 1 |
| Thermal resistance junction to ambient | RThJA | | | 170 | K/W | l=9.5mm (3/8"), TL=constant | 1 |
| Power dissipation | PDiss | | | 1 | W | Tamb 50 | 1 |
| Junction temperature | TJ | | | 175 | °C | | 1 |
| Storage temperature range | Ts | -55 | | 175 | °C | | 1 |
| Maximum dynamic impedance | ZZT | | | 20 | Ω | @IZT | 2 |
| Maximum dynamic impedance (knee) | ZZK | | | 750 | Ω | @IZK=0.25 mA | 2 |
| Maximum reverse leakage current | IR | | | 5 | µA | VR=13.7 V, Tamb=25 | 2 |
| Maximum regulator current | IZM | | | 50 | mA | Tamb=50 | 2 |
| Max surge current | | | | 250 | mA | 8.3ms | 2 |
| Nominal zener voltage | VZ | | 18 | | V | @IZT | 2 |
| Test current | IZT | | 14 | | mA | | 2 |
## CAD (KiCad official)
- Symbol: `DL4746A`
- Footprint: `Diode_SMD:D_MELF`
- 3D model: MELF (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [LGE datasheet](docs/dl4746a-datasheet.pdf) (3 pp, sha256 `a224b6085d68189f`, retrieved 2026-10-22, 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/dl4746a-datasheet.pdf)