S-272T

Overview

The Semitec S-272T is a surface-mount 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, ensuring stable current regardless of load resistance changes or ripple voltage. The device features a rated power of 500mW and a maximum rated voltage of 100V. Its pinch-off current is specified at 2.7mA with a typical limiting current ratio of 37:1. Operating temperature ranges from -40°C to +150°C, and it utilizes a 2-SMD, flat lead package.

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 a single component to create a constant current circuit
• Features high dynamic impedance for effective current regulation

Applications

• Constant current source for LED brightness stabilization
• Battery charge and discharge circuits
• Current source for proximity sensors and other sensors
• Stabilized power supply circuits

Procurement Notes

Verify the specific ordering suffix 'T' corresponds to the SMD reel taping format as defined in the product number explanation. Confirm that the required pinch-off current matches the 2.7mA specification for the S-272 model. Ensure the application voltage does not exceed the 100V maximum rating. Check packaging quantities against the standard 3000 pcs minimum for SMD types.

Selection Notes

Select the S-272T when a nominal pinch-off current of 2.7mA is required for the design. Consider the 500mW rated power capability for thermal management. Verify that the operating environment falls within the -40°C to +150°C range. For higher current requirements, consider using multiple CRDs in parallel as suggested in the documentation.

Part Context

The S-272T belongs to Semitec's S series of current regulating diodes, which are surface-mount variants. This series complements the E series (leaded type) and shares similar electrical characteristics but differs in packaging and recommended mounting dimensions. The 'T' suffix specifically denotes SMD reel taping.

Replacement Considerations

The E-272 is the direct through-hole equivalent with identical electrical specifications. Other S series models like S-202T or S-352T offer different current ratings but share the same package and general functionality.