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Product Detailed Parameters
- Description：IC MTR DRVR BIPOLR 3-5.5V 44PLCC
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tube
- Motor Type - Stepper：Bipolar
- Motor Type - AC, DC：-
- Function：Driver - Fully Integrated, Control and Power Stage
- Output Configuration：Half Bridge (4)
- Interface：Logic
- Technology：DMOS
- Step Resolution：1, 1/2, 1/4, 1/8
- Applications：General Purpose
- Current - Output：2.5A
- Voltage - Supply：3V ~ 5.5V
- Voltage - Load：8V ~ 35V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：44-LCC (J-Lead)
- Supplier Device Package：44-PLCC (16.59x16.59)
- Grade：-
- Qualification：-
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Overview
The A3977SED-T is a complete microstepping motor driver manufactured by Allegro MicroSystems, designed for bipolar stepper motors. It integrates PWM current control, protection circuits, and logic interfaces within a 44-pin PLCC package. The device features an output rating of ±2.5 A and supports load voltages up to 35 V. Logic supply voltage ranges from 3.0 V to 5.5 V. It offers step resolutions including full, half, quarter, and eighth-step modes. The component operates within a junction temperature range of -20°C to 150°C.
Feature Summary
- Integrates full microstepping control with built-in translator for simplified interface
- Features automatic current decay mode detection and selection for optimized performance
- Includes comprehensive protection mechanisms such as thermal shutdown and undervoltage lockout
Applications
- General purpose industrial automation systems
- Precision motion control applications requiring bipolar stepper motor drive
Procurement Notes
Verify the specific package type and pin configuration against the official datasheet before integration. Confirm that the 44-PLCC form factor aligns with the target PCB layout. Ensure the operating voltage requirements match the system design. Check for any recent product change notices regarding packaging or material composition updates.
Selection Notes
Select this component when a high-current bipolar stepper driver with integrated microstepping translation is required. The 44-pin PLCC package suits applications where board space allows for larger footprints but requires robust thermal dissipation. Consider the 150°C junction temperature limit for high-temperature environments. Evaluate the need for synchronous rectification and crossover current protection features inherent to this DMOS technology.
Part Context
The A3977SED-T belongs to the A3977 family of microstepping DMOS drivers. This series is engineered for high-performance stepper motor control in industrial settings. The SED suffix denotes the specific 44-pin plastic leaded chip carrier (PLCC) package variant. It provides a complete solution by combining power stages with control logic on a single die.
Replacement Considerations
The A3977SEDTR-T is a tape-and-reel version of the same device, offering identical electrical characteristics and functionality. Verify compatibility with automated assembly equipment if switching from tube to reel packaging.
