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SR3.3.TCT

Public Made by Adom

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SEMTECH ESD And Surge Protection (TVS/ESD), SOT-143. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SR3.3.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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sr3-3-tct.step / sr3-3-tct.glb are 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, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF