component
1SMA4742A
Public Made by Adomby adom
MDD（Microdiode Electronics） Zener Diodes, SMA(DO-214AC). 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
markdown1SMA4742A
MDD（Microdiode Electronics） · Zener Diodes · SMA(DO-214AC)
1SMA4742A from MDD（Microdiode Electronics）, in a SMA(DO-214AC). 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 | MDD（Microdiode Electronics） |
| Package | SMA(DO-214AC) |
| 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 (min, nom, max) | VZT | 11.4 | 12 | 12.6 | V | at IZT (21 mA); VZT tested with 20 ms pulses | 2 |
| Dynamic impedance, max | ZZT | 9 | Ω | at IZT (21 mA) | 2 | ||
| Admissible Zener current, max | IZM | 79 | mA | 2 | |||
| Forward voltage | VF | 1.2 | V | 1 | |||
| Peak power dissipation | PD | 1 | W | TA=50°C, mounted on 5.0 mm² land areas (Note 1) | 1 | ||
| Power derating above 50°C | PD | 6.67 | mW/°C | derate above 50°C | 1 | ||
| Operating junction temperature range | TJ | -55 | 150 | °C | 1 | ||
| Storage temperature range | TSTG | -55 | 150 | °C | 1 |
CAD (KiCad official)
- Symbol:
1SMA4742A - Footprint:
Diode_SMD:D_SMA - 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files:
1sma4742a-etched.step/1sma4742a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4742a.step/1sma4742a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MDD（Microdiode Electronics） datasheet (5 pp, sha256
b0a657aa72d39a2a, 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).