A6818SEP

Overview

The A6818SEP is a 32-bit serial input latched source driver manufactured by Allegro MicroSystems. It integrates a CMOS shift register, data latches, and control circuitry with bipolar sourcing outputs and PNP active pull-downs. Designed primarily for vacuum-fluorescent displays, it features a 60 V minimum output breakdown voltage and -40 mA output ratings. The device operates with a 3V to 5.5V supply and supports high-speed data storage. It is housed in a 44-pin PLCC package.

Feature Summary

• Combines CMOS shift register and latches with bipolar sourcing outputs
• Features PNP active pull-downs for improved performance
• Includes controlled output slew rate capability
• Supports low-power CMOS logic operation

Applications

• Vacuum-fluorescent display driving
• Peripheral power driver applications
• Dot matrix display systems

Procurement Notes

Verify the specific suffix (e.g., SEP vs SEPTR) against official datasheets to confirm packaging type and RoHS compliance status. Confirm end-of-life or obsolescence status directly with Allegro MicroSystems distributors before procurement planning. Ensure compatibility with existing 3V to 5.5V logic supplies and 60V load requirements.

Selection Notes

Select this component when a 32-bit serial interface is required for driving high-voltage loads up to 60V. It serves as an improved replacement for legacy parts like SN75518N and UCN5818x. Consider the 44-PLCC package constraints and the need for PNP active pull-downs in your design architecture.

Part Context

The A6818 belongs to Allegro's DABiC-IV technology family of source drivers. It is part of a series designed to replace older generation latch drivers. The device is distinct from motor drivers or LED controllers within the same manufacturer portfolio, focusing specifically on high-voltage display and peripheral load driving.

Replacement Considerations

Officially documented replacements include SN75518N, SN75518NF, UCN5818x, and UCQ5818x.