B57213P0709M301

Overview

The B57213P0709M301 is a leaded inrush current limiter (ICL) from the EPCOS P13 series, manufactured by TDK Electronics. It features a nominal resistance of 7 Ohms with a tolerance of ±20% at 25°C. The component supports a maximum steady-state current of 5 A and exhibits a low hot resistance of 122 mOhms under operating conditions. Key electrical specifications include a peak discharge current rating of 6 kA (8/20µs, single pulse) and a nominal discharge current of 3 kA (8/20µs, 15 pulses). The device has a typical capacitance of 400 pF and an energy absorption capacity of 125 J. Physically, it utilizes a radial package with a diameter of 14.5 mm and a lead spacing of 7.50 mm.

Feature Summary

• Provides effective circuit protection against high inrush currents during power-up sequences
• Features rapid self-heating characteristics to transition from high cold resistance to low hot resistance
• Designed for robust performance in consumer and industrial electronic applications

Applications

• Inrush current limiting in switching power supplies
• Protection circuits for AC/DC converters
• Surge suppression in general electronic equipment

Procurement Notes

Verify that the specific ordering suffix matches the required resistance and tolerance values. Confirm that the component meets all necessary safety certifications for the target application region. Ensure that thermal management requirements are addressed, as the device operates based on temperature-dependent resistance changes. Cross-reference the datasheet for precise soldering guidelines to maintain reliability.

Selection Notes

Select this component when a 7 Ohm nominal resistance is required for inrush control. Verify that the 5 A steady-state current rating exceeds the application's operational load. Consider the 125 J energy absorption capability relative to potential surge events. Ensure the physical dimensions fit within the designated PCB footprint and that the lead spacing aligns with the board layout.

Part Context

This part belongs to the EPCOS P13 series of NTC thermistors designed specifically for inrush current limitation. EPCOS, now integrated into TDK Electronics, produces these components to protect sensitive electronics from damage caused by initial charging currents. The P13 series is widely utilized across various industries for its reliability in managing transient electrical stresses.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.