S-562T

Overview

The Semitec USA Corp S-562T 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 and delivers a typical pinch-off current of 5.6 mA at 10V, with a minimum of 5.0 mA and maximum of 6.5 mA. The device features a rated power of 500 mW, a maximum peak operating voltage of 100 V, and a limiting voltage of 4.5 V. It supports an operating temperature range of -40°C to +150°C and utilizes a 2-SMD flat lead package.

Feature Summary

• Maintains constant current output regardless of applied voltage, load resistance changes, or ripple voltage variations.
• Requires only a single component to establish a constant current circuit, simplifying design compared to multi-component solutions.
• Provides stable performance across a wide operating temperature range suitable for demanding environments.

Applications

• Constant current source for LED brightness stabilization in street lights, fluorescent lamps, and downlights
• Battery charge and discharge circuits
• Current source for proximity sensors and other electronic sensors
• Telecommunications line interface applications

Procurement Notes

Verify the specific ordering suffix to confirm the packaging format, as the 'T' designation indicates SMD reel taping. Confirm that the required pinch-off current tolerance and temperature coefficient align with the application's stability requirements. Ensure the PCB layout accommodates the recommended pad dimensions for the 2-SMD flat lead package to guarantee reliable soldering and thermal performance during assembly.

Selection Notes

Select the S-562T when a nominal 5.6 mA regulated current is required within a 100V operational window. Consider using a series resistor if compensation for current reduction due to self-heating is necessary, as recommended values are provided in the datasheet. Verify that the 500 mW power rating is sufficient for the expected voltage drop and current conditions to prevent exceeding the junction temperature limit of 150°C.

Part Context

The S-562T belongs to the S Series of current regulating diodes manufactured by Semitec USA Corp. This series is characterized by its surface-mount construction and 500 mW power rating, distinguishing it from the axial-leaded E Series which typically offers a 300 mW rating. The S Series is designed for automated assembly processes and compact circuit board layouts.

Replacement Considerations

The E-562 is the axial-leaded equivalent within the same product family. Direct replacement requires verifying that the through-hole mounting style is acceptable and that the 300 mW power rating of the E-562 does not compromise reliability under high-voltage or high-power dissipation conditions compared to the 500 mW S-562T.

FAQ

How does the S-562T handle voltage fluctuations?

The S-562T maintains a constant current flow regardless of fluctuations in the applied voltage, load resistance changes, or ripple voltage, functioning effectively over a wide voltage range from less than 1V to 100V.

What is the typical pinch-off current for the S-562T?

The typical pinch-off current for the S-562T is 5.6 mA at 10V, with a specified range from a minimum of 5.0 mA to a maximum of 6.5 mA.

Is a resistor required for optimal performance?

While not strictly required for basic operation, adding a series resistor can compensate for current decreases caused by the CRD heating up. For the S-562T, a recommended resistance value is 62 kΩ.