As the demand for electronic components continues to grow in more diverse and complex embedded systems, it becomes crucial to protect sensitive applications against overcurrent conditions. Reliable circuit protection is a fundamental design consideration for cost-effective, long-lasting products. Each time a user plugs in, operates or leaves devices unattended, it is essential that there is a mechanism in place to ensure no above range current damages the very circuits that allow the device to work. Since most applications will not be accessible conveniently for replacement, such as with a conventional fuse or household circuit breaker, the concept of a resettable fuse has been adopted nearly universally. Some interface standards even require resettable overcurrent protection, recognizing and reminding designers in advance about the importance of robust circuit protection. The capability of delivering a smaller, faster, and lighter product than the competition truly begins at the component level, where parts are pushing the envelope with regard to minimal board space requirements and versatile use environments.