A6277EA-T

Overview

The A6277EA-T is a linear LED driver IC featuring an 8-channel shift register topology. It operates within a supply voltage range of 4.5 V to 5.5 V, delivering a typical output current of 120 mA per channel. The device supports PWM dimming and functions as a constant current source for LED arrays. It is housed in a 20-pin DIP package designed for through-hole mounting.

Feature Summary

• Integrates an 8-bit shift register for serial data input control
• Provides constant current regulation across multiple LED channels
• Supports pulse-width modulation for brightness adjustment

Applications

• LED matrix displays
• Segmented LED indicators
• Low-voltage lighting modules

Procurement Notes

Verify the specific suffix EA against the manufacturer datasheet to confirm pinout and thermal characteristics. Confirm RoHS compliance status as historical records indicate potential non-compliance for this variant. Ensure the 20-DIP package matches the target PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a low-voltage (5V) linear solution with integrated shift register functionality is required. It is suitable for designs prioritizing simplicity over efficiency. Consider alternative switching regulators if higher power dissipation or wider input voltage ranges are necessary for the application.

Part Context

This part belongs to Allegro's legacy linear LED driver portfolio. It serves as a dedicated controller for multi-channel LED arrays where precise current matching and simple serial interfacing are primary design constraints. The product line focuses on automotive and industrial signaling applications requiring robust yet straightforward drive circuits.

Replacement Considerations

The A6277EA is listed as obsolete. Verify compatibility with newer Allegro drivers such as the A6271 series for advanced topologies or other linear alternatives from the same family that maintain the 8-channel configuration and shift register interface.