A6278EA-T

Overview

The Allegro A6278EA-T is a serial-input constant-current latched LED driver designed for display applications. It features an integrated CMOS shift register, data latches, and eight NPN constant-current sink drivers. The device operates with a logic supply voltage range of 3.0 V to 5.5 V and supports typical serial data input rates up to 25 MHz. Output drive current is user-adjustable via a single external resistor, supporting up to 90 mA per channel. Key technical specifications include open LED detection capability, power-on reset (POR), internal under-voltage lockout (UVLO), and thermal shutdown circuitry.

Feature Summary

• Integrates CMOS shift register and latches for direct microprocessor interfacing
• Provides open LED connection detection signaled through the serial data output pin
• Includes Schmitt trigger inputs to enhance noise immunity
• Features staggered output delays to reduce electromagnetic interference

Applications

• LED matrix displays
• Signage systems
• Microprocessor-controlled lighting arrays

Procurement Notes

Verify the specific suffix EA-T against the manufacturer's official datasheet to confirm package type and temperature rating. Ensure compatibility with system voltage levels and serial communication protocols before integration. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component when designing systems requiring serial control of multiple LEDs with individual current regulation. It is suitable for applications needing open-circuit fault detection and high-speed data shifting. Consider the 16-pin eTSSOP package constraints and thermal management requirements for the intended operating environment.

Part Context

The A6278 belongs to Allegro MicroSystems' line of BiCMOS LED drivers tailored for display technologies. This series combines digital logic functions with analog current sinking capabilities. The device simplifies interface design by allowing cascading through a dedicated serial data output pin for expanded drive lines.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.