A3966SLBTR

Overview

The Allegro MicroSystems A3966SLBTR-T is a dual full-bridge PWM motor driver designed for bipolar stepper motors. It operates within a supply voltage range of 4.75 V to 5.5 V and supports load voltages up to 30 V. The device delivers an output current of 650 mA per channel with a maximum power dissipation of 1.87 W. It functions at a working frequency of 25.4 kHz and draws a typical operating supply current of 3 mA. The component is housed in a 16-SOIC package, suitable for surface-mount installation, and maintains an operational temperature range from -20°C to +85°C.

Feature Summary

• Integrates full bridge drivers with complete control logic and power stages for simplified design
• Supports pulse-width modulation (PWM) operation for efficient motor control
• Features parallel interface architecture for straightforward digital signal input

Applications

• Bipolar stepper motor control systems
• General purpose motion control applications
• Automated machinery drive circuits

Procurement Notes

Verify the specific suffix designation when ordering, as the provided data references the A3966SLBTR-T variant which indicates tape and reel packaging. Confirm RoHS compliance status, noting that earlier versions like the A3966SLB may be obsolete or non-compliant. Ensure the required moisture sensitivity level (MSL 3) is accounted for in storage and handling procedures. Cross-reference the exact part number with manufacturer documentation to confirm availability and current production status before finalizing procurement plans.

Selection Notes

Select this component for applications requiring integrated control and power driving for bipolar stepper motors within a 5V logic environment. The 650 mA output current suits moderate load requirements without external heat sinking in most standard conditions. Consider the 16-SOIC package dimensions for PCB layout constraints. Verify that the 25.4 kHz switching frequency aligns with system noise and efficiency requirements. Ensure the supply voltage remains strictly within the 4.75 V to 5.5 V range for proper operation.

Part Context

The A3966 belongs to a family of fully integrated motor drivers from Allegro MicroSystems. This series combines high-voltage DMOS technology with CMOS control logic. The SLBTR variant specifically denotes the surface-mount SOIC package configuration. It serves as a direct replacement for older through-hole DIP versions like the A3966SA, offering similar electrical performance in a compact form factor suitable for modern automated assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers include L293D from STMicroelectronics and TB6562AFG,8,EL from Toshiba Semiconductor. These alternatives are listed as similar functional replacements for the discontinued A3966SLB variant. Verify pin compatibility and current capabilities when transitioning between these specific parts.