CAT4008V-T1

Overview

The CAT4008V-T1 is an 8-channel constant current LED driver designed for display applications. It features a single external RSET resistor to program channel currents ranging from 2 mA to 100 mA. The device operates with a logic supply voltage between 3 V and 5.5 V and supports low LED dropout voltages as low as 0.4 V, enhancing power efficiency. It utilizes a high-speed 4-wire serial interface with a clock frequency up to 25 MHz for independent channel control. The component includes thermal shutdown protection and is available in RoHS-compliant 16-lead SOIC and TSSOP packages.

Feature Summary

• Eight independent constant current sink channels with unified programming via a single external resistor
• High-speed four-wire serial interface supporting cascading through a dedicated serial output pin
• Integrated thermal shutdown protection to disable outputs when die temperature exceeds safe limits
• Low voltage dropout capability on LED channels to maximize system power efficiency

Applications

• Billboard displays
• Marquee displays
• Instrument displays

Procurement Notes

Verify the specific package variant (SOIC or TSSOP) and tape-and-reel quantity against the official datasheet specifications. Confirm that the ordering suffix matches the required lead frame width and reel dimensions. Ensure compliance with environmental standards such as RoHS and halogen-free requirements as documented by the manufacturer.

Selection Notes

Select this component for designs requiring precise current regulation across multiple LEDs with minimal voltage headroom. The unified current setting simplifies bill of materials management compared to individually programmed drivers. Consider the serial interface speed and pin count when designing the PCB layout and microcontroller connections.

Part Context

This part belongs to the CAT4008 family of LED drivers manufactured by onsemi. The family is characterized by its ability to drive multiple LED channels with high accuracy and low dropout voltage. These devices are commonly used in general-purpose display applications where power efficiency and compact design are critical factors.

Replacement Considerations

Check for direct substitutes within the same product family that may offer different package options or updated manufacturing revisions. Verify compatibility with existing serial interface protocols and current programming resistor values before swapping components.