How to Use NTC Thermistors for Inrush Current Limiting

At the time of powering on an electronic device such as a switch-mode power supply (SMPS) or an inverter, the device is charged with an instantaneous abnormal current with a high peak. It is called an inrush current, and without protection, it may destroy a semiconductor device or have a harmful effect on the service life of a smoothing capacitor. TDK's NTC thermistors are used as inrush current limiters to protect circuits of electrical and electronic devices against inrush currents easily and effectively.

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