component
SM4T33CAY
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.
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
markdownSM4T33CAY
STMicroelectronics · TVS · SMA(DO-214AC)
SM4T33CAY 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 |
|---|---|---|---|---|---|---|---|
| Stand-off voltage / Breakdown voltage | VBR | 31.1 | 32.7 | 34.3 | V | @ IR = 1 mA, Tamb = 25 °C | 3 |
| Leakage current at 25 °C | IRM | 0.2 | µA | @ VRM = 28 V, 25 °C | 3 | ||
| Leakage current at 85 °C | IRM | 1 | µA | @ VRM = 28 V, 85 °C | 3 | ||
| Stand-off voltage | VRM | 28 | V | Tamb = 25 °C | 3 | ||
| Clamping voltage 10/1000 µs | VCL | 45.4 | V | @ IPP = 8.8 A, 10/1000 µs | 3 | ||
| Dynamic resistance 10/1000 µs | RD | 1.26 | Ω | 10/1000 µs | 3 | ||
| Clamping voltage 8/20 µs | VCL | 59 | V | @ IPP = 39 A, 8/20 µs | 3 | ||
| Dynamic resistance 8/20 µs | RD | 0.632 | Ω | 8/20 µs | 3 | ||
| Voltage temperature coefficient | αT | 9.8 | 10-4/°C | 3 | |||
| Peak pulse voltage ISO 10605 contact discharge | VPP | 30 | kV | C = 150 pF, R = 330 Ω and C = 330 pF, R = 330 Ω; Tamb = 25 °C | 2 | ||
| Peak pulse voltage ISO 10605 air discharge | VPP | 30 | kV | C = 150 pF, R = 330 Ω and C = 330 pF, R = 330 Ω; Tamb = 25 °C | 2 | ||
| Peak pulse power dissipation | PPP | 400 | W | Tj initial = Tamb, 10/1000 µs, Tamb = 25 °C | 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:
SM4T33CAY - Footprint:
Diode_SMD:D_SMA - 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files:
sm4t33cay-etched.step/sm4t33cay-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sm4t33cay.step/sm4t33cay.glbare 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, 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).