S-183T

Overview

The S-183T is a surface-mount current regulating diode (CRD) manufactured by Semitec USA Corp. It maintains a constant current of 18 mA with a maximum allowable reverse current of 50 mA. The device features a rated power of 500 mW and supports a maximum voltage of 50 V. It operates within a temperature range of -40°C to 150°C. The component utilizes a 2-SMD, flat lead package and includes a cathode ring marking for orientation.

Feature Summary

• Maintains constant current flow despite voltage fluctuations or load resistance changes
• Requires only one part to accomplish constant current circuit functions
• Provides stable current over a wide voltage range from less than 1V to 100V

Applications

• Constant current source for LED brightness stabilization
• Battery charge and discharge circuits
• Current source for piezoelectric actuators

Procurement Notes

Verify the specific pinout configuration against the official datasheet before integration. Confirm that the operating environment remains within the specified -40°C to 150°C range to ensure performance stability. Ensure proper thermal management is implemented given the 500 mW rated power dissipation limit.

Selection Notes

Select this component when a fixed 18 mA regulation is required in a compact surface-mount design. Consider the 50 V maximum voltage rating for circuit compatibility. Evaluate the need for external compensation resistors if precise current adjustment due to heat-up effects is necessary for the specific application.

Part Context

This component belongs to the S series of Semitec current regulating diodes, which are designed for surface-mount applications. The 'T' suffix indicates reel taping for automated assembly. It serves as a simplified alternative to multi-component constant current circuits, offering high dynamic impedance and linear characteristics.

Replacement Considerations

Direct substitutes include other S-series CRDs with similar current ratings, such as the S-152T or S-202T, depending on the exact current requirement. Verify package dimensions and electrical parameters match the original design constraints.