component
DL4742A
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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DL4742A
LGE · Zener Diodes · MELF
DL4742A 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; zener voltage for DL4742A is 12 V nominal at 21 mA test current (±5% tolerance with suffix A). |
| 2 | A | passive | Anode terminal at the end of the MELF glass case opposite the cathode band; forward voltage is 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 |
|---|---|---|---|---|---|---|---|
| Nominal zener voltage | Vz | 12 | V | @ IZT | 2 | ||
| Zener voltage tolerance (suffix A) | Vz | -5 | 5 | % | suffix "A" | 1 | |
| Test current | IZT | 21 | mA | 2 | |||
| Maximum dynamic impedance | ZZT | 9 | Ω | @ IZT | 2 | ||
| Maximum dynamic impedance (knee) | ZZK | 700 | Ω | @ IZK | 2 | ||
| Forward voltage | VF | 1.2 | V | IF=200mA | 1 | ||
| Power dissipation | PDiss | 1 | W | Tamb 50°C, electrodes kept at ambient temperature | 1 | ||
| Junction temperature | TJ | 175 | °C | 1 | |||
| Storage temperature range | Ts | -55 | 175 | °C | 1 | ||
| Thermal resistance junction to ambient | RThJA | 170 | K/W | l=9.5mm (3/8"), TL=constant | 1 |
CAD (KiCad official)
- Symbol:
DL4742A - 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).
# DL4742A
**LGE** · Zener Diodes · MELF
DL4742A 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; zener voltage for DL4742A is 12 V nominal at 21 mA test current (±5% tolerance with suffix A). |
| 2 | A | passive | Anode terminal at the end of the MELF glass case opposite the cathode band; forward voltage is 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 |
|---|---|---|---|---|---|---|---|
| Nominal zener voltage | Vz | | 12 | | V | @ IZT | 2 |
| Zener voltage tolerance (suffix A) | Vz | -5 | | 5 | % | suffix "A" | 1 |
| Test current | IZT | | 21 | | mA | | 2 |
| Maximum dynamic impedance | ZZT | | | 9 | Ω | @ IZT | 2 |
| Maximum dynamic impedance (knee) | ZZK | | | 700 | Ω | @ IZK | 2 |
| Forward voltage | VF | | | 1.2 | V | IF=200mA | 1 |
| Power dissipation | PDiss | | | 1 | W | Tamb 50°C, electrodes kept at ambient temperature | 1 |
| Junction temperature | TJ | | | 175 | °C | | 1 |
| Storage temperature range | Ts | -55 | | 175 | °C | | 1 |
| Thermal resistance junction to ambient | RThJA | | 170 | | K/W | l=9.5mm (3/8"), TL=constant | 1 |
## CAD (KiCad official)
- Symbol: `DL4742A`
- 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/dl4742a-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/dl4742a-datasheet.pdf)