component
SR3.3.TCT
Public Made by Adomby adom
SEMTECH ESD And Surge Protection (TVS/ESD), SOT-143. Pinout cross-checked by two models against the datasheet, 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
markdownSR3.3.TCT
SEMTECH · ESD And Surge Protection (TVS/ESD) · SOT-143
SR3.3.TCT from SEMTECH, in a SOT-143. 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 | REF1 | power_in | Negative reference (REF1) for the steering diodes, which should be connected directly to a ground plane with the shortest possible path to minimize parasitic inductance. |
| 2 | I/O (data line) | bidirectional | Protected data line; transients on this line are steered by the internal diodes to the REF1 or REF2 reference, and the device is rated for a 3.3 V reverse stand-off voltage (VRWM). |
| 3 | I/O (data line) | bidirectional | Second protected data line, clamped to the same REF1/REF2 references through the internal steering diodes; device stand-off voltage is 3.3 V (VRWM). |
| 4 | REF2 | passive | Positive reference (REF2), connected internally to the cathode of the low-voltage TVS; not recommended to connect directly to a DC source above the snap-back voltage (normally 2.8 V for a 3.3 V device) because the device can latch on. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SEMTECH |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |
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 (tp = 8/20µs) | Ppk | 50 | Watt | tp = 8/20µs | 2 | ||
| Reverse leakage current | IR | 1 | µA | VRWM = 3.3V, T=25°C | 2 | ||
| Clamping voltage | VC | 7 | V | IPP = 1A, tp = 8/20µs | 2 | ||
| Reverse stand-off voltage | VRWM | 3.3 | V | 2 | |||
| Operating temperature | TJ | -55 | 125 | °C | 2 | ||
| Storage temperature | TSTG | -55 | 150 | °C | 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 | tin | Matte Tin Lead Finish Matte tin has become the industry standard lead-free | 5 |
CAD (KiCad official)
- Symbol:
SR3.3.TCT - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
sr3-3-tct-etched.step/sr3-3-tct-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sr3-3-tct.step/sr3-3-tct.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SEMTECH datasheet (7 pp, sha256
cdea28b379ed2c4b, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(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).