S-202T

Overview

The Semitec S-202T is a Current Regulating Diode (CRD) designed to maintain constant current flow despite voltage fluctuations. It operates within a wide voltage range from less than 1V to 100V and supplies constant current regardless of load resistance changes or ripple voltage. The device features a rated power of 500 mW, a maximum rated voltage of 100 V, and an allowable reverse current of 50 mA. It has a junction temperature limit of 150 °C and functions in an operating temperature range of -40 to 150 °C. The pinch-off current at 10 V is typically 2.00 mA, with a limiting current ratio of 1.1 max.

Feature Summary

• Maintains constant current flow across a wide voltage range from less than 1V to 100V
• Provides stable current output independent of load resistance changes and ripple voltage
• Requires only one component to create a constant current circuit

Applications

• Constant current source for LED brightness stabilization
• Battery charge / discharge circuits
• Telecommunications line interface
• Stabilized power supply circuits

Procurement Notes

Verify the specific part number against official Semitec documentation to ensure correct series selection. Confirm that the SMD reel taping option matches your assembly requirements. Check the recommended mounting pad dimensions for the S-202T variant to ensure proper PCB layout compatibility.

Selection Notes

Select the S-202T when a typical pinch-off current of 2.00 mA is required. Ensure the application voltage does not exceed the 100 V maximum rating. Consider using a compensation resistor if current reduction due to heat up needs to be mitigated. Verify the operating temperature range meets the system's environmental demands.

Part Context

The S-202T belongs to the S series of Current Regulating Diodes from Semitec. This series utilizes surface mount technology (SMD) packaging. It is part of a broader lineup that includes leaded types (E series) and various current ratings. The S series generally offers a rated power of 500 mW and an operating temperature range of -40 to 150 °C.

Replacement Considerations

The E-202 is the direct leaded equivalent to the S-202T. Both share identical electrical characteristics including a 2.00 mA pinch-off current. Substitution requires accounting for the difference between SMD and axial leaded packaging.