B57211P0330M301

Overview

The B57211P0330M301 is a negative temperature coefficient (NTC) thermistor manufactured by EPCOS, now part of TDK Electronics. This component belongs to the B57211 series designed for inrush current limiting applications in power supplies and electronic equipment. It features a nominal resistance value of 33 Ohms at 25°C with a tolerance of ±20%. The device is housed in a radial leaded package suitable for through-hole mounting on printed circuit boards. Key electrical characteristics include a maximum steady-state current rating and specific energy absorption capabilities defined by its I²t rating, ensuring reliable protection against surge currents during initial power-up phases.

Feature Summary

• Provides effective inrush current limitation for AC/DC converters and power supplies
• Utilizes NTC material properties to reduce resistance as temperature increases
• Designed for robust performance under repeated thermal cycling conditions
• Radial leaded construction facilitates easy integration into standard PCB layouts

Applications

• Inrush current limiting in switch-mode power supplies
• Protection circuits for AC mains input stages
• Surge current suppression in consumer electronics
• Industrial control system power inputs

Procurement Notes

Verify the exact ordering code suffix to ensure correct tolerance and packaging configuration. Confirm that the thermal environment matches the component's rated operating temperature range. Check datasheet specifications for peak current limits to prevent device failure during installation.

Selection Notes

Select based on required nominal resistance and maximum steady-state current ratings. Ensure the I²t rating exceeds the expected surge energy of the application circuit. Consider physical size constraints for PCB mounting and verify lead spacing compatibility with existing board designs.

Part Context

This component is part of the broader B57211 family of NTC thermistors specifically engineered for inrush current limiting. These devices are widely used across various industries where reliable startup protection is critical. The product line emphasizes consistency in electrical performance and mechanical durability for mass production environments.

Replacement Considerations

Direct substitutes must match the 33 Ohm nominal resistance and similar I²t ratings. Verify pinout compatibility and thermal characteristics before swapping components. Consult manufacturer cross-reference lists for approved alternative part numbers within the same series.