component
ZM4747A
Public Made by Adomby adom
EIC Semicon 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownZM4747A
EIC Semicon · Zener Diodes · MELF
ZM4747A from EIC Semicon, 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 | EIC Semicon |
| 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 (standard, nominal VZ) | -5 | 5 | % | Standard tolerance on nominal zener voltage; type number carries ±5% (Note 3) | 2 | ||
| Maximum DC zener current | IZM | 45 | mA | Note (2): electrodes at 10 mm from case kept at ambient temperature | 2 | ||
| Maximum zener impedance | ZZT | 22 | Ω | @ IZT = 12.5 mA | 2 | ||
| Maximum zener impedance (knee) | ZZK | 750 | Ω | @ IZK = 0.25 mA | 2 | ||
| Maximum reverse leakage current | IR | 5 | μA | @ VR = 15.2 V | 2 | ||
| Maximum forward voltage | VF | 1.2 | V | @ IF = 200 mA | 1 | ||
| Power dissipation | PD | 1 | W | Note (1): valid provided electrodes are kept at ambient temperature | 1 | ||
| Thermal resistance junction to ambient air | RθJA | 170 | °C/W | Note (1): valid provided electrodes are kept at ambient temperature | 1 | ||
| Junction temperature | TJ | -65 | 200 | °C | 1 | ||
| Storage temperature range | TS | -65 | 200 | °C | 1 | ||
| Nominal zener voltage | VZ | 20 | V | @ IZT = 12.5 mA | 2 |
CAD (KiCad official)
- Symbol:
ZM4747A - Footprint:
Diode_SMD:D_MELF - 3D model: MELF (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: EIC Semicon datasheet (2 pp, sha256
bfe11882515920ca, 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).