component
DL4738A
Public Made by Adomby adom
LGE Zener Diodes, MELF. Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
main
DL4738A
LGE · Zener Diodes · MELF
DL4738A 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
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 (DL4738A, suffix A) | -5 | 5 | % | Suffix A denotes ±5% tolerance; standard parts are ±10% | 1 | ||
| Nominal zener voltage | VZ | 8.2 | V | Test current IZT = 31 mA | 2 | ||
| Test current | IZT | 31 | mA | Nominal zener voltage test current | 2 | ||
| Maximum dynamic impedance | ZZT | 4.5 | Ω | At IZT = 31 mA | 2 | ||
| Maximum dynamic impedance (knee) | ZZK | 700 | Ω | At IZK (test current value not reliably legible in extracted text) | 2 | ||
| Maximum regulator current | IZM | 110 | mA | @ Tamb = 50°C | 2 | ||
| Power dissipation | PDiss | 1 | W | @ Tamb = 50°C; valid provided electrodes are kept at ambient temperature (note 1) | 1 | ||
| Junction temperature | TJ | 175 | °C | 1 | |||
| Storage temperature range | Ts | -55 | 175 | °C | 1 | ||
| Forward voltage | VF | 1.2 | V | IF = 200 mA | 1 | ||
| Thermal resistance junction to ambient | RThJA | 170 | K/W | Junction ambient, I = 9.5 mm (3/8 in), TL = constant | 1 |
CAD (KiCad official)
- Symbol:
DL4738A - 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 2026-10-21, 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).
# DL4738A
**LGE** · Zener Diodes · MELF
DL4738A 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## 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 (DL4738A, suffix A) | | -5 | | 5 | % | Suffix A denotes ±5% tolerance; standard parts are ±10% | 1 |
| Nominal zener voltage | VZ | | 8.2 | | V | Test current IZT = 31 mA | 2 |
| Test current | IZT | | 31 | | mA | Nominal zener voltage test current | 2 |
| Maximum dynamic impedance | ZZT | | | 4.5 | Ω | At IZT = 31 mA | 2 |
| Maximum dynamic impedance (knee) | ZZK | | | 700 | Ω | At IZK (test current value not reliably legible in extracted text) | 2 |
| Maximum regulator current | IZM | | | 110 | mA | @ Tamb = 50°C | 2 |
| Power dissipation | PDiss | | | 1 | W | @ Tamb = 50°C; valid provided electrodes are kept at ambient temperature (note 1) | 1 |
| Junction temperature | TJ | | | 175 | °C | | 1 |
| Storage temperature range | Ts | -55 | | 175 | °C | | 1 |
| Forward voltage | VF | | | 1.2 | V | IF = 200 mA | 1 |
| Thermal resistance junction to ambient | RThJA | | 170 | | K/W | Junction ambient, I = 9.5 mm (3/8 in), TL = constant | 1 |
## CAD (KiCad official)
- Symbol: `DL4738A`
- 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/dl4738a-datasheet.pdf) (3 pp, sha256 `a224b6085d68189f`, retrieved 2026-10-21, 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/dl4738a-datasheet.pdf)