component
1SMA4746H
Public Made by Adomby adom
Taiwan Semiconductor Zener Diodes, DO-214AC(SMA). 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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Contents
README
markdown1SMA4746H
Taiwan Semiconductor · Zener Diodes · DO-214AC(SMA)
1SMA4746H from Taiwan Semiconductor, in a DO-214AC(SMA). 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 | Taiwan Semiconductor |
| Package | DO-214AC(SMA) |
| 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 | 18 | V | VZ @ IZ = IZT (14.0 mA) | 2 | ||
| Test current | IZT | 14 | mA | 2 | |||
| Zener impedance | ZZT | 20 | Ω | @ IZT | 2 | ||
| Zener impedance | ZZK | 750 | Ω | @ IZK = 0.25 mA | 2 | ||
| Leakage current | IR | 1 | µA | @ VR = 13.7 V | 2 | ||
| Surge current (non-repetitive) | 250 | mA | 1/120 s half sine or equivalent pulse superimposed on IZT, JEDEC (Note 5) | 2 | |||
| Standard tolerance on nominal zener voltage | -5 | 5 | % | Standard tolerance for listed type numbers (Note 1); no tighter-tolerance suffix in MPN | 2 | ||
| Power dissipation | PD | 1 | W | RTHJA < 76.8 K/W, TA = 25°C | 1 | ||
| Power dissipation | PD | 1.25 | W | RTHJA < 76.8 K/W, TA = 60°C | 1 | ||
| Non repetitive peak power dissipation | PZSM | 60 | W | tp = 100µs sq. pulse, TA = 25°C prior to surge | 1 | ||
| Peak forward surge current | IFSM | 30 | A | 8.3 ms single half sine-wave superimposed on rated load | 1 | ||
| Junction temperature | TJ | -55 | 175 | °C | 1 | ||
| Storage temperature | TSTG | -55 | 175 | °C | 1 | ||
| Thermal resistance, junction to ambient | RTHJA | 76.8 | K/W | Basis of the power dissipation ratings (PD rows) | 1 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | ● Terminal: Matte tin plated leads, solderable per J-STD-002 ● Meet JESD 201 class 2 whisker test | 1 |
CAD (KiCad official)
- Symbol:
1SMA4746H - Footprint:
Diode_SMD:D_SMA - 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files:
1sma4746h-etched.step/1sma4746h-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);1sma4746h.step/1sma4746h.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Taiwan Semiconductor datasheet (8 pp, sha256
663f68cf0fca07a1, 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).