A4911KJPTR-T-1

Overview

The A4911KJPTR-T-1 is an automotive-grade, fully integrated three-phase BLDC motor controller and driver manufactured by Allegro MicroSystems. It operates within a supply voltage range of 5.5V to 50V and supports junction temperatures from -40°C to +150°C. The device features three half-bridge outputs for driving N-channel MOSFETs, integrated current sense amplifiers, and SPI or direct logic interface control. Designed for ASIL-B compliance, it includes comprehensive protection mechanisms such as overcurrent, overtemperature, and cross-conduction prevention.

Feature Summary

• Integrated ASIL-B functional safety architecture with diagnostic capabilities
• Three-phase gate driver with programmable dead-time and drive strength
• Built-in current sensing amplifiers for precise torque control
• Supports both SPI serial and direct logic input configurations

Applications

• Automotive cooling fan motors
• Electric power steering systems
• Water pump controllers in vehicle thermal management
• Blower motor applications requiring high reliability

Procurement Notes

Verify the specific suffix '-1' against official Allegro documentation to confirm any distinct manufacturing lot or revision differences compared to the standard A4911KJPTR-T variant. Ensure compatibility with your system's SPI protocol implementation and validate that the ASIL-B rating meets your project's safety integrity requirements before finalizing procurement.

Selection Notes

Select this component when designing automotive BLDC motor drives requiring integrated power stages and safety diagnostics. It eliminates the need for external gate drivers and current sense amplifiers, reducing board space. Consider its 48-LQFP package constraints and thermal dissipation needs relative to your expected load currents and ambient operating conditions.

Part Context

This part belongs to the A4911 series of multiphase motor drivers designed specifically for harsh automotive environments. It integrates the control logic, gate drivers, and protection circuits into a single chip, simplifying the design of robust motor control systems while adhering to strict automotive quality and safety standards.

Replacement Considerations

The A4911KJPTR-T is the primary equivalent part number within the same family. Verify pinout and software register compatibility if substituting between these variants.