S-701T

Overview

The S-701T is a surface-mount current regulating diode (CRD) from Semitec USA Corp, designed to maintain constant current flow despite voltage fluctuations. It operates within a wide voltage range of less than 1V to 100V and features a rated power of 500mW. The device supports an operating temperature range of -40°C to 150°C with a junction temperature limit of 150°C. Key electrical specifications include a typical pinch-off current of 0.70mA at 10V, with a minimum-to-maximum range of 0.60mA to 0.90mA. The limiting current ratio (I100V/Ip) is typically between 0.8 and 1.1, and the temperature coefficient ranges from 0.00% to -0.32% per °C.

Feature Summary

• Maintains constant current output regardless of applied voltage, load resistance changes, or ripple voltage variations.
• Simplifies circuit design by replacing multiple components required for constant current generation with a single part.
• Provides stable performance across a wide operating temperature range suitable for diverse environmental conditions.

Applications

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

Procurement Notes

Verify the specific ordering suffix to confirm packaging format, as 'T' indicates SMD reel taping. Confirm compliance with RoHS3 standards and moisture sensitivity level (MSL 1) requirements for your assembly process. Ensure the selected variant matches the required pinch-off current tolerance and thermal characteristics for your specific application environment.

Selection Notes

Select the S-701T when a nominal pinch-off current of approximately 0.7mA is required. Consider the 500mW power rating and 100V maximum voltage capability. Evaluate the temperature coefficient range (-0.32%/°C max) against thermal stability needs. For currents above 1mA, consider adding a compensation resistor to mitigate current reduction due to self-heating effects.

Part Context

The S-701T belongs to Semitec's S series of surface-mount current regulating diodes. This series complements the axial E series, offering equivalent electrical performance in a compact SMD package. The S series is optimized for automated surface mount assembly processes while maintaining the reliability and constant current regulation characteristics of the broader CRD product line.

Replacement Considerations

The E-701 is the axial leaded equivalent within the same product family. Verify that the target replacement component matches the 0.7mA pinch-off current tolerance and 500mW power dissipation rating. Ensure the substitute device supports the required -40°C to 150°C operating temperature range and compatible package dimensions for PCB integration.