CAT4008W-T2

Overview

The CAT4008W-T2 is an 8-channel constant current LED driver designed for display applications. It features a 4-wire serial interface operating at up to 25 MHz for independent channel control. The device supports LED currents from 2 mA to 100 mA, programmed via a single external RSET resistor. It offers high voltage efficiency with low dropout voltages of 300 mV at 30 mA and 0.4 V across the 2–100 mA range. The logic supply operates between 3 V and 5.5 V. Integrated thermal shutdown protects against overheating, and the part is available in RoHS-compliant 16-lead SOIC packages.

Feature Summary

• Provides eight tightly matched constant current sink channels for precise LED brightness control
• Features a high-speed 25 MHz four-wire serial interface with cascading capability for multi-device expansion
• Enables unified current programming through a single external resistor to simplify circuit design
• Includes thermal shutdown protection to automatically disable outputs when die temperature exceeds safe limits

Applications

• Billboard displays
• Marquee displays
• Instrument displays

Procurement Notes

Verify component authenticity and datasheet alignment before integration. Confirm package dimensions and pinout compatibility with existing PCB footprints. Check for specific ordering suffixes that may affect packaging or environmental compliance. Ensure design margins account for absolute maximum ratings to prevent device failure during operation.

Selection Notes

Select this driver for designs requiring uniform current regulation across multiple LED channels. The low dropout voltage improves power efficiency compared to standard drivers. Verify that the application environment stays within the specified junction temperature range. Consider the serial interface speed and cascading needs when planning system architecture.

Part Context

This component belongs to the CAT4008 series of constant current LED drivers manufactured by onsemi. It is specifically engineered for general-purpose display applications where precise current matching and efficient power management are critical. The series includes variants with different package options to suit various manufacturing requirements.

Replacement Considerations

Public records indicate the CAT4008W-T2 has reached End-of-Life status as of Q2 2014. Engineers should consult official discontinuance notices for recommended replacement parts or alternative solutions compatible with existing designs.