A3979SLP

Overview

The A3979SLP is a fully integrated bipolar stepper motor driver and controller manufactured by Allegro MicroSystems. It features a DMOS half-bridge output configuration with four outputs, designed for driving bipolar stepper motors. The device supports multiple microstepping resolutions including full, half, quarter, and sixteenth steps. It operates with a logic supply voltage range of 3V to 5.5V and a load voltage range of 8V to 35V. The maximum output current is 2.5A. The component is housed in a 28-TSSOP-EP package with an exposed pad for thermal management.

Feature Summary

• Fully integrated control and power stage for bipolar stepper motors
• Supports selectable microstepping resolutions from full step to 1/16 step
• Built-in translator eliminates the need for external clock signals

Applications

• General purpose bipolar stepper motor control
• Office automation equipment
• Industrial motion control systems

Procurement Notes

Verify the specific suffix and tape change status as the A3979SLP may be subject to obsolescence notices. Confirm RoHS compliance status as historical data indicates non-compliance for some variants. Check for active replacement parts such as the A3979SLPTR-T if the standard tube packaging is unavailable or discontinued.

Selection Notes

Select this component for applications requiring a single-chip solution for bipolar stepper motors with up to 2.5A output current. Ensure the system load voltage does not exceed 35V. Verify that the required microstepping resolution is supported by the internal translator. Consider the 28-TSSOP-EP package for thermal dissipation requirements in surface mount designs.

Part Context

The A3979SLP belongs to the A3979 family of stepper motor drivers from Allegro MicroSystems. This series is characterized by its high integration level, combining logic control with power DMOS outputs. The SLP variant specifically denotes the TSSOP package form factor. It serves as a predecessor or alternative to newer iterations like the A4979 series which offer higher voltage ratings.

Replacement Considerations

Public confirmed substitute part numbers include TB6560AHQ from Toshiba Semiconductor and Storage.