A3935KLQTR

Overview

The A3935KLQTR-T is a three-phase brushless DC motor controller and driver manufactured by Allegro MicroSystems. It operates with a supply voltage range of 4.75 V to 5.25 V and supports load voltages from 7 V to 40 V. The device features an output current capability of 40 mA and consumes a typical operating supply current of 7 mA. It is housed in a 36-pin QSOP package designed for surface mount installation. The component functions within a temperature range of -40°C to +150°C and includes humidity sensitivity classification. This integrated circuit serves as a pre-driver for half-bridge configurations, managing commutation and direction control for BLDC applications.

Feature Summary

• Integrated three-phase pre-driver architecture supporting half-bridge outputs for brushless DC motor commutation
• Built-in direction management and commutation control logic for simplified system integration
• Power MOSFET technology utilized for the driver stage interface
• Automotive-grade qualification ensuring reliability under specified thermal conditions

Applications

• Brushless DC (BLDC) motor commutation control
• Direction management systems in automotive applications
• Three-phase motor drive pre-driver circuits

Procurement Notes

Verify that the specific suffix 'T' denotes the tape and reel packaging format, distinct from tube variants. Confirm the part status is Not Recommended for New Design (NRND) or obsolete before finalizing procurement plans. Ensure compatibility with the 36-QSOP footprint and check for any recent Product Change Notices regarding packaging or material updates. Validate that the 4.75V to 5.25V supply requirement aligns with the target system design.

Selection Notes

Select this component when a dedicated three-phase BLDC pre-driver with integrated commutation logic is required. The narrow 4.75V to 5.25V supply range dictates compatibility with specific logic levels. Consider the 40 mA output current limit for driving external power stages. The 36-QSOP package size and surface mount orientation are critical constraints for PCB layout. Verify that the -40°C to +150°C operating temperature range meets the environmental requirements of the end application.

Part Context

The A3935 series represents Allegro MicroSystems' portfolio of three-phase motor controllers designed for robust performance in demanding environments. The KLQ variant specifically indicates the 36-QSOP package configuration. This family targets applications requiring precise commutation and direction control without complex external microcontroller intervention for basic operation. The integration of driver and control logic reduces component count in motor drive assemblies.

Replacement Considerations

Public documentation identifies A4933KJPTR-T as a suggested replacement device for the A3935KLQTR-T. Verify pinout compatibility and electrical parameter alignment between these part numbers before substitution.