CAT4008Y-T2

Overview

The CAT4008Y-T2 is an 8-channel constant current LED driver designed for billboard and marquee displays. It features a 4-wire serial interface operating at up to 25 MHz, allowing independent channel control via shift registers and latches. The device supports cascading through a serial output pin (SOUT). LED channel currents are programmable from 2 mA to 100 mA using a single external RSET resistor. It operates with logic supply voltages between 3 V and 5.5 V and provides thermal shutdown protection. The component is available in RoHS-compliant 16-lead SOIC and TSSOP packages.

Feature Summary

• Provides eight tightly matched constant current sink channels for precise LED brightness control
• Features a high-speed 4-wire serial interface with cascading capability for multi-device expansion
• Includes a dedicated blanking control pin to disable all outputs independently of the serial interface
• Integrates thermal shutdown protection to automatically disable LED outputs when die temperature exceeds limits

Applications

• Billboard display systems
• Marquee display applications
• Instrument display panels

Procurement Notes

Verify the specific suffix 'Y' against official onsemi documentation to confirm package type and tape/reel specifications. Confirm availability status as some variants may be discontinued or subject to temporary suspension. Ensure compatibility with required operating temperature ranges and voltage levels before procurement.

Selection Notes

Select this component for applications requiring independent control of multiple LED strings with minimal power loss. The low dropout voltage enhances efficiency compared to standard drivers. Consider the 17 ns per-channel delay feature for managing inrush current during latch activation. Verify that the external RSET resistor value aligns with the desired current range of 2 mA to 100 mA.

Part Context

The CAT4008 series belongs to onsemi's portfolio of linear LED drivers tailored for general display applications. It complements other models like the CAT4106 by offering an 8-channel solution suitable for medium-density displays. The device emphasizes power efficiency and ease of integration through its serial interface and unified current programming.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence regarding channel count, current range, and interface protocol if considering alternative manufacturers.