MS3220008B

Inrush Current Limiters (ICL) Overview

The MS3220008B is a Negative Temperature Coefficient (NTC) ceramic inrush current limiter manufactured by Vishay Ametherm. It features a nominal resistance of 20 Ohms with a tolerance of ±25% at 25°C. The component supports a maximum steady-state current of 8 Amps and has a physical diameter of 31mm. It is designed for radial PCB mounting and is rated for AC voltages including 120VAC, 240VAC, 480VAC, and 680VAC.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC ceramic technology to provide high initial resistance that decreases as temperature rises during operation.
• Designed to limit peak inrush currents when charging capacitive loads or energizing transformers.
• Supports radial through-hole PCB mounting for integration into power supply circuits.

Inrush Current Limiters (ICL) Applications

• Protection for switching power supplies against initial surge currents
• Limiting inrush current in motor drive circuits
• Surge protection for transformer-based power systems

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific voltage rating requirements of the target application against the component's AC ratings (120VAC, 240VAC, 480VAC, 680VAC). Confirm that the steady-state current does not exceed 8A. Ensure the PCB footprint matches the radial lead spacing and body dimensions specified in the official datasheet to guarantee proper mechanical fit and thermal performance.

Inrush Current Limiters (ICL) Selection Notes

Select this component when the circuit requires an 8A steady-state current capacity and a 20 Ohm initial resistance. Consider the 31mm body size for adequate heat dissipation. Evaluate the maximum recommended energy rating of 250 Joules to ensure the component can handle the specific capacitive load without damage. Verify compatibility with the operating voltage range of the system.

Inrush Current Limiters (ICL) Part Context

This part belongs to the MS32 series of inrush current limiters from Vishay Ametherm. These components are specialized passive devices used primarily in power electronics. The series offers various resistance and current ratings to suit different power levels, providing a standardized solution for managing startup surges in industrial and commercial electronic equipment.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes must match the 20 Ohm resistance, 8A current rating, and 31mm diameter. Cross-reference with other manufacturers' NTC thermistors offering identical electrical characteristics and radial package dimensions to ensure functional equivalence in the existing PCB layout.