S-152T

Overview

The Semitec S-152T is a surface-mount current regulating diode (CRD) designed to maintain a constant current flow despite voltage fluctuations. It operates within a wide voltage range from less than 1V to 100V, ensuring stable performance regardless of load resistance changes or ripple voltage. The device features a rated power of 500mW and an allowable reverse current of 50mA. Its pinch-off current is specified at 1.50mA typical, with a limiting current ratio ranging from -0.13 to -0.40. The component supports an operating temperature range of -40°C to +150°C and utilizes a 2-SMD flat lead package.

Feature Summary

• Maintains constant current supply over a wide voltage range from less than 1V to 100V
• Requires only one part to accomplish constant current circuit functions typically needing multiple components
• Provides stable operation regardless of voltage fluctuations, load resistance changes, and ripple voltage

Applications

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

Procurement Notes

Verify the specific ordering suffix 'T' corresponds to the SMD reel taping configuration as defined in the product number explanation. Confirm that the required pinch-off current tolerance aligns with the specified min-max limits for the 1.5mA rating. Ensure the application voltage does not exceed the 100V maximum peak working voltage. Check thermal management requirements against the 500mW rated power limit at elevated temperatures.

Selection Notes

Select the S-152T when a constant current of approximately 1.5mA is required for surface-mount designs. Consider the -40°C to +150°C operating range for harsh environments. Use compensation resistors if current reduction due to heat up needs mitigation. Verify that the 2-SMD package dimensions fit the recommended mounting pad layout for reliable soldering.

Part Context

The S-152T belongs to the Semitec S series of current regulating diodes, which are surface-mount variants of the E series. This series is engineered for applications requiring precise current regulation without complex circuitry. The S series generally offers higher rated power compared to axial types, facilitating compact PCB layouts while maintaining robust electrical characteristics across varying thermal conditions.

Replacement Considerations

The datasheet lists the E-152 as the equivalent leaded type. No other direct surface-mount substitutes are explicitly confirmed in the provided documentation. Verify pinout compatibility and thermal dissipation capabilities before substituting with generic CRDs.