L99SM81VQ6TR

Overview

The L99SM81VQ6TR is a programmable stepper motor driver designed for automotive applications, featuring micro-stepping capabilities. Manufactured by STMicroelectronics, it operates within a supply voltage range of 6 V to 28 V and delivers an output current of 1.35 A. The device supports a working frequency of 40 kHz and includes an integrated 5 V regulator. It is qualified under the AEC-Q100 standard for automotive reliability. The component functions as a half-bridge driver with two outputs and consumes a typical operating supply current of 1.2 mA. It is housed in a QFN-40 package suitable for surface mount installation.

Feature Summary

• Programmable micro-stepping functionality for precise motion control in automotive environments
• Integrated half-bridge architecture supporting dual stepper motor coil outputs
• AEC-Q100 qualification ensuring compliance with automotive grade reliability standards

Applications

• Automotive seat adjustment actuators
• Vehicle mirror positioning systems
• Thermal management fan control in automotive HVAC systems

Procurement Notes

Verify that the specific suffix Q6TR corresponds to the required tape and reel packaging configuration intended for high-volume automated assembly processes. Confirm that the AEC-Q100 automotive qualification aligns with your system's environmental stress screening requirements. Ensure compatibility with the specified QFN-40 footprint during PCB layout finalization to prevent mechanical or thermal interface issues.

Selection Notes

Select this component when designing automotive stepper motor interfaces requiring programmable micro-stepping resolution. The 1.35 A output capability suits moderate power actuation needs within the 6 V to 28 V vehicle electrical system range. Consider the QFN-40 package constraints regarding thermal dissipation and board space availability compared to larger packages like PowerSSO-36 found in related series variants.

Part Context

This part belongs to the L99SM81V series of stepper motor drivers from STMicroelectronics. It shares core functional characteristics with other members of the family but differs in physical packaging. While similar models utilize PowerSSO-36 packages, this specific variant employs a QFN-40 form factor, impacting thermal management strategies and PCB mounting considerations for automotive embedded control designs.

Replacement Considerations

The L99SM81VYTR serves as a direct alternative within the same product family, offering identical electrical specifications and micro-stepping features. The primary distinction lies in the package type, with the YTR variant utilizing a PowerSSO-36 housing instead of the QFN-40 configuration used by the L99SM81VQ6TR.