component
SR70.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
markdownSR70.TCT
SEMTECH · ESD And Surge Protection (TVS/ESD) · SOT-143
SR70.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 (ground) for the steering diodes; should be connected directly to a ground plane with the shortest possible path to minimize parasitic inductance. |
| 2 | I/O1 | bidirectional | Data line 1 protected by steering diodes that clamp transients to REF1 or REF2, with a maximum clamping voltage of one diode drop (VF) above the reference and typical line capacitance of 5pF. |
| 3 | I/O2 | bidirectional | Data line 2 protected by steering diodes that clamp transients to REF1 or REF2, with a maximum clamping voltage of one diode drop (VF) above the reference and typical line capacitance of 5pF. |
| 4 | REF2 | power_in | Positive reference, connected either to the supply rail (VCC) or to an external TVS diode, above which the steering diodes conduct when the protected line exceeds it by one diode drop. |
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 |
|---|---|---|---|---|---|---|---|
| Reverse Breakdown Voltage | VBR | 58 | V | IT = 50µA | 2 | ||
| Reverse Leakage Current | IR | 5 | µA | VRWM = 70V, T=25°C | 2 | ||
| Peak Reverse Stand-Off Voltage | VRWM | 70 | V | 2 | |||
| Peak Pulse Current | IPP | 24 | A | tp = 8/20µs | 2 | ||
| Rectifier Repetitive Peak Reverse Voltage | VRRM | 70 | V | 2 | |||
| ESD per IEC 61000-4-2 (Air) | VESD | 15 | kV | ESD per IEC 61000-4-2 (Air) | 2 | ||
| ESD per IEC 61000-4-2 (Contact) | VESD | 8 | kV | ESD per IEC 61000-4-2 (Contact) | 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 | 4 |
CAD (KiCad official)
- Symbol:
SR70.TCT - Footprint:
Package_TO_SOT_SMD:SOT-143 - 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files:
sr70-tct-etched.step/sr70-tct-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sr70-tct.step/sr70-tct.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SEMTECH datasheet (6 pp, sha256
a18fa904634d860b, retrieved 2026-10-19, 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).