ST33001C

Overview

The ST33001C is an inrush current limiter manufactured by Littelfuse Inc. It features a nominal resistance of 33 Ohms with a tolerance of ±20%. The device supports a continuous current rating of 1.5 A and has a physical diameter of 0.600 inches (15.24 mm). This component belongs to the ST Series, which utilizes specially formulated NTC thermistors designed for circuit protection.

Feature Summary

• Utilizes specially formulated NTC thermistor technology
• Designed specifically for inrush current limiting applications

Applications

• Power supply input protection
• Transformer inrush current suppression
• Capacitive load charging control

Procurement Notes

Verify the specific datasheet version for the ST33001C to confirm thermal characteristics and maximum energy ratings. Ensure the application environment temperature aligns with the component's operating limits. Cross-reference the 1.5 A continuous current rating against peak operational loads to prevent thermal failure during sustained operation.

Selection Notes

Select this component when managing high initial surge currents in circuits with capacitive or transformer loads. The 33 Ohm resistance value provides effective impedance during startup while allowing normal operation. Consider the 1.5 A current rating to ensure it exceeds the steady-state operating current without overheating.

Part Context

This part is categorized under Circuit Protection within Littelfuse's power solutions portfolio. It serves as a passive component to enhance reliability by mitigating stress on downstream electronics during power-up phases, distinguishing it from active switching solutions.

Replacement Considerations

Consult Littelfuse documentation for direct equivalents within the ST Series. Verify that substitute parts match the 33 Ohm resistance and 1.5 A current specifications to maintain circuit integrity.