

The Littelfuse SM7 Series is a plastic-encapsulated surface-mount metal oxide varistor (MOV) transient voltage surge suppressor that is designed to be operated continuously across AC power lines.
The series comprises a Nylon molded package with tin plated lead frame for soldering to board. The surface mount SM7 Series is based on radial 7mm internal varistor element with similar characteristics to the Littelfuse LA / ZA series of varistor.
- Electrical equivalent to leaded types LA/ZA series
- Ac voltage ratings from 115 V to 510 V
- No derating up to 85°C ambient
- Good solderability
- Supplied on a tape and reel
- Application of AC power meters
SM7 Parts
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Part Number | Actions | Polarity | Co Typ (pF) | Vc (V) | VMAX AC (V) | VMAX DC (V) | VNDC MAX (V) | VNDC MIN (V) | ITM 1xAmps (A) | Agency Approvals |
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Part Number | Actions | Polarity | Co Typ (pF) | Vc (V) | VMAX AC (V) | VMAX DC (V) | VNDC MAX (V) | VNDC MIN (V) | ITM 1xAmps (A) | Agency Approvals | |
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SM7 Applications
- Ac power meters
Series: SM7 Resources

Varistors Catalog
Learn about Littelfuse varistors and how to choose the best form of overvoltage protection for your application.

Circuit Protection Selection Guide
Consult this guide to learn about circuit protection considerations and the solutions Littelfuse offers. Tables help match products with applications.
SM7 Custom Products Request
Need your SM7 parts customized? Please let us know about yourself and your project needs, and a Littelfuse expert will be in touch about customizing our product(s) for you.