component
SM4T50AY
Public Made by Adomby adom
STMicroelectronics TVS, 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.
Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
| Name | Last updated |
|---|---|
| docs | 14d ago |
| viewers | 5d ago |
| package.json | 14d ago |
| page.json | 14d ago |
| README.md | 14d ago |
| sm4t50ay-etched.glb | 14d ago |
| sm4t50ay-etched.step | 14d ago |
| sm4t50ay-hero.glb | 14d ago |
| sm4t50ay-hero.overlay.json | 14d ago |
| sm4t50ay.glb | 14d ago |
| sm4t50ay.kicad_mod | 14d ago |
| sm4t50ay.kicad_sym | 5d ago |
| sm4t50ay.lbr | 5d ago |
| sm4t50ay.step | 14d ago |
SM4T50AY
STMicroelectronics · TVS · SMA(DO-214AC)
SM4T50AY from STMicroelectronics, 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 | 1 | passive | Terminal 1 of an unpolarised fuse; either orientation. |
| 2 | 2 | passive | Terminal 2 of an unpolarised fuse; either orientation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SMA(DO-214AC) |
| Category | TVS/Fuse/Board Level Protection |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage | VBR | 47.8 | 50.3 | 52.8 | V | at IR, Tamb = 25 °C | 3 |
| Test current for breakdown voltage | IR | 1 | mA | 3 | |||
| Stand-off voltage | VRM | 43 | V | 3 | |||
| Reverse leakage current 25 °C | IRM | 0.2 | µA | at VRM, 25 °C | 3 | ||
| Reverse leakage current 85 °C | IRM | 1 | µA | at VRM, 85 °C | 3 | ||
| Clamping voltage 10/1000 µs | VCL | 69.4 | V | 10/1000 µs | 3 | ||
| Peak pulse current 10/1000 µs | IPP | 5.7 | A | 10/1000 µs | 3 | ||
| Dynamic resistance 10/1000 µs | RD | 2.91 | Ω | 10/1000 µs | 3 | ||
| Clamping voltage 8/20 µs | VCL | 91 | V | 8/20 µs | 3 | ||
| Peak pulse current 8/20 µs | IPP | 25 | A | 8/20 µs | 3 | ||
| Dynamic resistance 8/20 µs | RD | 1.53 | Ω | 8/20 µs | 3 | ||
| Voltage temperature coefficient | αT | 10.2 | 10-4/°C | 3 | |||
| Peak pulse power dissipation | PPP | 400 | W | Tj initial = Tamb, 10/1000 µs | 2 | ||
| Peak pulse voltage, contact discharge (IEC 61000-4-2) | VPP | 30 | kV | IEC 61000-4-2, C = 150 pF, R = 330 Ω | 2 | ||
| Peak pulse voltage, air discharge (IEC 61000-4-2) | VPP | 30 | kV | IEC 61000-4-2, C = 150 pF, R = 330 Ω | 2 | ||
| Peak pulse voltage, contact discharge (ISO10605) | VPP | 30 | kV | ISO10605, C = 330 pF, R = 330 Ω | 2 | ||
| Peak pulse voltage, air discharge (ISO10605) | VPP | 30 | kV | ISO10605, C = 330 pF, R = 330 Ω | 2 | ||
| Storage temperature range | Tstg | -65 | 150 | °C | 2 | ||
| Operating junction temperature range | Tj | -55 | 150 | °C | 2 | ||
| Maximum lead temperature for soldering | TL | 260 | °C | during 10 s | 2 |
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 | copper | copper area under each lead | 5 |
CAD (KiCad official)
- Symbol:
SM4T50AY - Footprint:
Diode_SMD:D_SMA - 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files:
sm4t50ay-etched.step/sm4t50ay-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sm4t50ay.step/sm4t50ay.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (14 pp, sha256
d0b3703a71d93ac6, retrieved 2026-10-27, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins, primarytwo-terminal 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).