S-352T

Overview

The Semitec S-352T 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 peak operating voltage of 100V. Its pinch-off current is specified at 3.5mA with a limiting current range of 3.00mA to 4.1mA. 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 output across a wide voltage range without requiring multiple components for circuit implementation.
• Provides stable current regulation independent of applied voltage fluctuations, load resistance variations, and ripple voltage.
• Features high dynamic impedance characteristics suitable for various power supply environments.

Applications

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

Procurement Notes

Verify the specific manufacturer part number against official Semitec documentation to ensure authenticity. Confirm that the received components match the required SMD package dimensions and electrical specifications. Check RoHS compliance status if environmental regulations apply to your assembly process. Ensure storage conditions prevent moisture damage prior to soldering.

Selection Notes

Select the S-352T when a precise 3.5mA constant current is required in a surface-mount design. Consider the 500mW power rating and 100V voltage limit during thermal and electrical analysis. Evaluate the -40°C to +150°C operating range against your environmental requirements. Compare against other S-series models if different current levels are needed.

Part Context

The S-352T belongs to the Semitec S series of current regulating diodes, which are surface-mount variants of their broader CRD lineup. This series is engineered for compact designs where space constraints preclude axial-leaded components. It shares functional principles with the E-series but offers SMD packaging advantages for automated assembly processes.

Replacement Considerations

Direct substitutes include other Semitec S-series CRDs with similar current ratings, such as the S-272T or S-452T, provided the current difference is acceptable. Cross-manufacturer replacements require verification of pinch-off current, voltage limits, and package compatibility.