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SM4T50CAY

Public Made by Adom

by 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.

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SM4T50CAY

STMicroelectronics · TVS · SMA(DO-214AC)

SM4T50CAY 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
Peak pulse power dissipation PPP 400 W Tj initial = Tamb, 10/1000 µs 2
Peak pulse voltage ISO 10605 C=150 pF R=330 Ω contact discharge VPP 30 kV ISO 10605, C = 150 pF, R = 330 Ω, contact discharge 2
Peak pulse voltage ISO 10605 C=150 pF R=330 Ω air discharge VPP 30 kV ISO 10605, C = 150 pF, R = 330 Ω, air discharge 2
Peak pulse voltage ISO 10605 C=330 pF R=330 Ω contact discharge VPP 30 kV ISO 10605, C = 330 pF, R = 330 Ω, contact discharge 2
Peak pulse voltage ISO 10605 C=330 pF R=330 Ω air discharge VPP 30 kV ISO 10605, C = 330 pF, R = 330 Ω, air discharge 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
Leakage current IRM 0.2 µA @ VRM, 25 °C 3
Leakage current IRM 1 µA @ VRM, 85 °C 3
Breakdown voltage VBR 47.8 50.3 52.8 V @ IR = 1 mA, pulse test tp < 50 ms 3
Stand-off voltage VRM 43 V 3
Clamping voltage 10/1000 µs VCL 69.4 V @ 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 @ 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

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 ambient versus copper surface under each lead 5

CAD (KiCad official)

  • Symbol: SM4T50CAY
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
  • 3D model files: sm4t50cay-etched.step / sm4t50cay-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sm4t50cay.step / sm4t50cay.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (12 pp, sha256 b8d3299b0200f7ea, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins, primary two-terminal 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