component

SM4T30CAY

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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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

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SM4T30CAY

STMicroelectronics · TVS · SMA(DO-214AC)

SM4T30CAY 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 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 STMicroelectronics
Package SMA(DO-214AC)
Category Circuit 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 28.9 30.4 31.9 V @ IR = 1 mA; pulse test tp < 50 ms; Tamb = 25 °C 3
Leakage current @ VRM, 25 °C IRM 0.2 µA @ VRM, 25 °C 3
Leakage current @ VRM, 85 °C IRM 1 µA @ VRM, 85 °C 3
Clamping voltage, 10/1000 µs VCL 42.1 V @ IPP = 9.5 A, 10/1000 µs 3
Dynamic resistance, 10/1000 µs RD 1.07 Ω 10/1000 µs 3
Clamping voltage, 8/20 µs VCL 53.5 V @ IPP = 43 A, 8/20 µs 3
Dynamic resistance, 8/20 µs RD 0.502 Ω 8/20 µs 3
Voltage temperature coefficient αT 9.7 10-4/°C 3
Stand-off voltage VRM 26 V 3
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
Peak pulse power dissipation PPP 400 W Tj initial = Tamb 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 ambient versus copper surface under each lead 5

CAD (KiCad official)

  • Symbol: SM4T30CAY
  • Footprint: Diode_SMD:D_SMA
  • 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
  • 3D model files: sm4t30cay-etched.step / sm4t30cay-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sm4t30cay.step / sm4t30cay.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 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