ST30003B

Overview

The ST30003B is a power thermistor designed for inrush current limiting applications. It features a nominal resistance of 30 ohms with a tolerance of ±20% at 25°C. The component supports a maximum steady-state current of 3 amperes and exhibits a cold resistance of 460 milliohms. Its physical diameter measures 0.700 inches, equivalent to 17.78 millimeters. This device belongs to the Littelfuse power circuit protection category and is classified as an inrush current limiter.

Feature Summary

• Provides effective inrush current limitation for electronic circuits
• Constructed as a robust power thermistor for high-current handling
• Designed for integration into bulk packaged assembly processes

Applications

• Power supply input stages requiring surge suppression
• Industrial equipment control circuits
• Consumer electronics power management systems

Procurement Notes

Verify the specific manufacturer datasheet for the ST30003B to confirm compliance with required electrical standards and thermal characteristics. Ensure that the selected component matches the exact resistance and current ratings necessary for the target application circuit design. Cross-reference official Littelfuse documentation to validate package dimensions and mounting requirements before finalizing procurement decisions.

Selection Notes

Select this component based on its 30-ohm initial resistance and 3-ampere current capacity relative to the system's peak load requirements. Evaluate the thermal performance and physical size constraints to ensure compatibility with the intended PCB layout. Confirm that the inrush limiting capability aligns with the sensitivity of downstream components within the power distribution network.

Part Context

This part falls under Littelfuse's broader portfolio of circuit protection solutions, specifically within the power thermistor segment. It serves as a critical element for managing transient currents during power-up sequences. The product line emphasizes reliability and durability for industrial and commercial power applications requiring robust surge protection mechanisms.

Replacement Considerations

Consult official Littelfuse substitution guides for verified alternative part numbers. Do not assume cross-compatibility with generic thermistors without verifying electrical parameters and physical dimensions against the original specifications.