A6277SLWTR

Overview

The A6277SLWTR is an integrated LED driver IC manufactured by Allegro MicroSystems, designed for linear current regulation applications. It features eight independent outputs capable of delivering up to 150mA per channel. The device operates within a supply voltage range of 4.5V to 5.5V and supports a maximum output voltage of 4V. It utilizes a shift register topology for control interface management. The component is housed in a 20-SOIC surface-mount package with dimensions of 7.50mm width. It is rated for an operating temperature range from -40°C to +85°C ambient temperature.

Feature Summary

• Integrates eight linear current-regulated outputs for uniform LED brightness control
• Utilizes shift register topology for serial data input and parallel output distribution
• Includes internal switching mechanisms to manage load connections efficiently

Applications

• LED matrix display systems requiring multi-channel current regulation
• Backlighting drivers for liquid crystal displays (LCDs)
• General-purpose LED illumination circuits in consumer electronics

Procurement Notes

Verify the specific suffix configuration against official datasheets to ensure compatibility with required RoHS compliance standards, as variations exist within the product family. Confirm lead times and availability status directly with authorized distributors, noting that this part number may be subject to discontinuation or lifecycle changes. Cross-reference the exact ordering code to match packaging requirements such as tape and reel specifications.

Selection Notes

Select this component when designing circuits requiring multiple independently regulated LED channels without external current-sensing resistors. Ensure the application voltage remains within the 4.5V to 5.5V range to maintain proper operation. Consider the thermal performance of the 20-SOIC package if high total power dissipation is expected across all eight channels simultaneously.

Part Context

This part belongs to the A6277 series of LED drivers from Allegro MicroSystems. It is functionally similar to variants like the A6277ELWTR-T but differs in output current ratings and regulatory compliance status. The series is characterized by its linear drive capability and shift register interface, distinguishing it from PWM-based or buck-boost driver families.

Replacement Considerations

Official substitutes include the A6277ELWTR-T, which offers comparable functionality but with different current ratings and RoHS compliance. Verify pinout compatibility and electrical parameters before substitution.