A3967SLB-T

Overview

The A3967SLB-T is a complete microstepping motor driver with a built-in translator, designed for bipolar stepper motors. It supports full-, half-, quarter-, and eighth-step modes. The device features an output drive capability of 30 V and ±750 mA. It includes a fixed off-time current regulator capable of operating in slow, fast, or mixed current-decay modes to reduce audible noise and improve step accuracy. The logic supply voltage range is 3.0 V to 5.5 V. Integrated protections include internal UVLO, thermal shutdown, and crossover-current protection.

Feature Summary

• Built-in translator enables direct interface with simple pulse and direction signals without external microcontroller sequencing.
• Automatic current-decay mode detection and selection optimizes performance across varying load conditions.
• Fixed off-time current regulator reduces audible motor noise and increases step accuracy.
• Integrated safety features provide internal under-voltage lockout, thermal shutdown, and crossover-current protection.

Applications

• Bipolar stepper motor control in office automation equipment
• Positioning systems in industrial automation
• Motion control modules in consumer appliances

Procurement Notes

Verify the specific suffix against the manufacturer's official datasheet to confirm pinout compatibility and electrical ratings. Ensure the ordering code matches the required package type and temperature range. Cross-reference the part number with the latest Allegro MicroSystems documentation to avoid discrepancies between legacy and updated revisions.

Selection Notes

Select this component when a single-chip solution for bipolar stepper motors is required. It is suitable for applications needing microstepping resolution up to eighth-step. Consider the ±750 mA output rating and 30 V voltage limit for load matching. The integrated translator simplifies design by removing the need for complex external sequencing logic.

Part Context

The A3967 belongs to Allegro MicroSystems' family of DMOS microstepping drivers with translators. These devices are engineered to simplify the design of stepper motor control systems. The series typically integrates power DMOS switches, control logic, and protection circuits into a single package, reducing board space and component count compared to discrete solutions.

Replacement Considerations

Public confirmed substitute part numbers: A3967SLBT, A3967SLBTR-T.