A3946KLBTR-T

Overview

The A3946KLBTR-T is a half-bridge power MOSFET controller manufactured by Allegro MicroSystems, designed for driving N-channel MOSFETs in motor applications. It operates within a supply voltage range of 7V to 60V and supports an ambient temperature range from -40°C to 135°C. The device is housed in a 16-SOIC package with exposed pad for thermal management. Key electrical features include an on-chip charge pump enabling operation at minimum 7V input, high-current gate drive capability, and bootstrapped gate drive for 100% duty cycle performance.

Feature Summary

• Integrates an on-chip charge pump to facilitate operation with low input supply voltages starting at 7V
• Provides high-current gate drive suitable for controlling a wide variety of N-channel power MOSFETs
• Supports 100% duty cycle operation through bootstrapped gate drive architecture combined with the charge pump

Applications

• Brushless DC (BLDC) motor control systems
• General purpose AC and DC motor driver circuits
• Industrial automation equipment requiring robust half-bridge switching

Procurement Notes

Verify that the specific suffix 'BTR' corresponds to the SOIC package variant rather than the TSSOP version when sourcing. Confirm RoHS compliance status as historical data indicates variations between similar part numbers. Ensure the supplier provides official datasheets matching the 16-SOIC footprint requirements for your PCB layout.

Selection Notes

Select this component when a dedicated half-bridge controller is required for N-channel MOSFETs in the 7V to 60V range. It is appropriate for designs needing integrated overtemperature and undervoltage protection without external logic complexity. Consider the SOIC package constraints if space is limited compared to the TSSOP alternative.

Part Context

This part belongs to the A3946 family of half-bridge controllers from Allegro MicroSystems. It shares core functional specifications with the A3946KLPTR-T but differs in physical packaging. The family is engineered for reliable motor commutation and direction management in industrial and consumer applications.

Replacement Considerations

The A3946KLPTR-T serves as a parameter-equivalent substitute, offering identical electrical characteristics but in a 16-eTSSOP-EP package instead of 16-SOIC. Verify pinout compatibility and thermal pad dimensions before swapping packages.