A6277ELW-T

Overview

The Allegro MicroSystems A6277ELW-T is an eight-channel linear LED driver IC housed in a 20-SOIC package. It operates on a supply voltage range of 4.5V to 5.5V with a maximum output voltage of 4V per channel. Each channel delivers a constant current of 120mA, controlled via a serial interface operating at frequencies up to 20MHz. The device supports PWM dimming and functions within a temperature range of -40°C to 85°C.

Feature Summary

• Eight independent linear output channels for precise LED current control
• Serial shift register interface for simplified data input and control
• Integrated PWM dimming capability for brightness adjustment
• Internal switching topology eliminates external power switches

Applications

• Automotive interior lighting systems
• Industrial high-brightness LED arrays
• Consumer electronic display backlighting
• General purpose LED illumination modules

Procurement Notes

Verify component status as the A6277ELW-T is marked as obsolete by the manufacturer. Confirm availability through authorized distributors or secondary markets. Ensure compatibility with existing PCB footprints and design specifications before procurement. Check for RoHS3 compliance documentation if required for specific regulatory standards.

Selection Notes

Select this component when designing circuits requiring multiple independently controlled LED channels with linear regulation. The 20-SOIC package suits surface-mount assembly processes. Consider the 120mA per channel limit and 4V output voltage ceiling against load requirements. Verify that the serial interface timing aligns with the host microcontroller capabilities.

Part Context

This part belongs to the A6277 family of LED drivers from Allegro MicroSystems. It shares core architectural features with variants like the A6277ELWTR-T, differing primarily in packaging format. The series targets applications needing reliable, multi-channel LED management with integrated protection features.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.