component

SM712

Public Unreviewed

by Ray

DOWO ESD And Surge Protection (TVS/ESD), SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Symbol & Footprint

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Datasheet

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Contents

README

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SM712

DOWO · ESD And Surge Protection (TVS/ESD) · SOT-23

SM712 from DOWO, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 I/O1 passive RS-485 differential data line 1 input/output. Internally clamped to GND via 12V TVS (positive) and 7V TVS (negative) to protect against ESD, EFT and lightning surges. Working peak reverse voltage 12V.
2 I/O2 passive RS-485 differential data line 2 input/output. Internally clamped to GND via 12V TVS (positive) and 7V TVS (negative). Working peak reverse voltage 12V; clamping voltage 20V @ Ipp=5A, 26V @ Ipp=12A.
3 GND passive Ground reference. Common cathode/anode node for the internal TVS pairs; connect to system ground. 7V working reverse voltage from GND to either I/O pin (negative transient path).

Key specifications

Parameter Value
Manufacturer DOWO
Package SOT-23
Category Circuit Protection
Pins 3

CAD (KiCad official)

  • Symbol: SM712
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: DOWO datasheet (5 pp, sha256 8ed313d9580abb5a, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF