ST15004C

Overview

The ST15004C is a power thermistor inrush current limiter manufactured by Littelfuse Inc. It features a nominal resistance of 15 Ohms with a tolerance of ±20%. The component supports a maximum steady-state current of 4 A and has a physical diameter of 0.770 inches (19.56 mm). This device is designed to limit surge currents during the initial power-up phase of electronic circuits.

Feature Summary

• Functions as a power thermistor for inrush current limiting applications
• Provides high resistance at cold start to restrict surge current flow
• Heats up during operation to reduce resistance for normal current flow

Applications

• Power supply input stages
• Transformer primary circuits
• Capacitive load protection

Procurement Notes

Verify the specific Littelfuse datasheet revision and RoHS compliance status prior to ordering. Confirm that the 15 Ohm resistance value and 4 A current rating align with the target circuit's thermal and electrical requirements. Ensure the lead time and availability are checked directly with authorized distributors, as these details are not included in this technical summary.

Selection Notes

Select this component when a 15 Ohm cold resistance is required to manage inrush currents up to 4 Amperes. Consider the 19.56 mm package size for board layout constraints. Evaluate the thermal dissipation capabilities to ensure the device can handle the energy absorption during repeated power cycles without exceeding temperature limits.

Part Context

This part belongs to the category of inrush current limiters (ICL) within Littelfuse's circuit protection portfolio. These components are distinct from fuses or resettable PPTCs, serving specifically to mitigate high startup currents in power electronics rather than providing overcurrent protection or short-circuit interruption.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Cross-referencing requires matching the 15 Ohm resistance, 4 A rating, and 19.56 mm diameter specifications with equivalent products from other manufacturers.