SM712-02HTG
TECH PUBLIC
Needs validationlow risk
A robust, AEC-Q101 qualified upgrade from Littelfuse with higher power and current ratings.
Best Alternatives to SM712
The SM712 is a popular asymmetrical TVS diode in a SOT-23 package, designed to protect RS-485 data lines. This page provides a comprehensive review of potential replacements, including direct functional alternates and robust upgrades from leading manufacturers.
AI replacement insight
Electrical riskhigh
Using a part with incorrect voltage (e.g., 5V, 15V, or symmetrical) will not protect the RS-485 transceiver correctly.
Package riskmedium
While SOT-23 is standard, pin assignments can vary between manufacturers. Failure to verify pinout can lead to incorrect installation.
Sourcing risklow
The SM712 family is widely multi-sourced, reducing sourcing risk.
Can it be replaced directly?
Direct replacement for SM712 should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The Littelfuse SM712-02HTG is the best replacement, offering a significant upgrade in power, current, and automotive qualification.
Main risk
The main risk is inadvertently selecting a TVS with the wrong voltage characteristics (e.g., symmetrical or for a different bus like CAN) or a different pinout in the same SOT-23 package.
Recommended alternatives
3Alternative comparison matrix
| Feature / factor | SM712 | SM712-02HTG | SM712.TCT | PSM712 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-23 | SOT23-3 | SOT23 | SOT-23 | SOT23-3 / SOT-23 — Mechanically compatible with SOT-23.; SM712.TCT: matched; PSM712: matched |
| Power | 300 W | 600 W | 400 W | 300 W | 600 W / 400 W / 300 W — Higher power handling provides more robustness.; SM712.TCT: Higher power handling.; PSM712: One source shows 400W, another shows 300W. Using conservative value. |
| Current | 12 A | 19 A | 17 A | 12 A | 19 A / 17 A / 12 A — Higher peak pulse current rating.; SM712.TCT: Higher peak current.; PSM712: matched |
| Voltage | 7V / 12V | -7V to 12V | +12V to -7V | 7V / 12V | -7V to 12V / +12V to -7V / 7V / 12V — Asymmetrical voltage matches RS-485 requirements.; SM712.TCT: matched; PSM712: matched |
| Application | Not specified | AEC-Q101 | - | - | AEC-Q101 — Qualified for automotive applications. |
Application & sourcing insights
Questions & answers
Verified drop-in options for SM712 are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.