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.
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README.mdadded+55@@ -0,0 +1,55 @@+# ZM4747A++**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](docs/zm4747a-datasheet.pdf) (2 pp, sha256 `bfe11882515920ca`, 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/zm4747a-datasheet.pdf)
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