Excessive inrush current is a common challenge in switching power supplies. During startup, a typical 300W SMPS may experience surge currents of 50A
Excessive inrush current is a common challenge in switching power supplies. During startup, a typical 300W SMPS may experience surge currents of 50A to 100A, which can damage rectifier bridges, weld relay contacts, and reduce system reliability.
Power NTC thermistors provide an effective and cost-efficient solution. Their unique characteristics make them ideal for inrush current limiting:
1. High resistance at startup: limits surge current and protects downstream components.
2. Low resistance during normal operation: resistance drops significantly after heating, minimizing power loss and heat generation.
3. Improved system reliability: higher thermal capacity provides additional protection and fault tolerance compared with fixed resistors.
Recommended JYH HSU NTC Thermistors
MF72 5D-9 / 10D-11
Suitable for low- and medium-power SMPS
Compact and cost-effective
Ideal for 220V consumer and industrial power supplies
MF72 5D-13
Designed for medium- and high-power applications
High steady-state current capability
Excellent surge resistance for industrial power supplies and display equipment
At JYH HSU (Dongguan Zhixu Electronics), our MF72 power NTC thermistors undergo rigorous reliability testing, including 1000-hour steady-state current endurance tests, ensuring stable performance and reliable supply.
Looking for the right inrush current limiter for your power supply design?
Contact us for free samples and one-on-one selection support.
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Email: jec888@jeccap.cn
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Post time: Jun-25-2026