L6474HTR

Overview

The L6474HTR is a stepper motor driver from STMicroelectronics, packaged in a 28-pin HTSSOP with an exposed pad. It operates within a supply voltage range of 8 V to 45 V and delivers a peak output current of 7.0 A (3.0 A r.m.s.). The device supports up to 1/16 microstepping via an SPI interface and features non-dissipative current sensing. It functions reliably across an operating temperature range of -40 °C to +150 °C.

Feature Summary

• Integrates dual low RDS(on) DMOS full bridges with accurate on-chip current sensing for non-dissipative control
• Achieves high-resolution motion control through adaptive decay mode enabling up to 1/16 microstepping
• Provides comprehensive protection including programmable overcurrent limits and two-level overtemperature shutdown

Applications

• Industrial automation systems requiring precise stepper motor positioning
• Medical equipment demanding reliable motion control under strict thermal constraints
• Security mechanisms such as access control locks and automated gates

Procurement Notes

Verify the specific suffix HTR indicates tape and reel packaging configuration. Confirm RoHS compliance status and ECOPACK2 package details against the latest manufacturer datasheet. Ensure the ordering part number matches the required industrial temperature grade and pinout specifications for your PCB layout.

Selection Notes

Select this component when designing systems requiring integrated power stage and digital control without external logic. The wide voltage range accommodates various bus voltages. Evaluate thermal management requirements given the exposed pad design and high current capability. Ensure the host controller supports the standard SPI interface for register configuration.

Part Context

This part belongs to the L6474 family of EasySPIN stepper motor drivers. It combines analog mixed-signal technology with digital control features. The HTR suffix specifically denotes the reel packaging format used for automated surface-mount assembly processes.

Replacement Considerations

Check for direct substitutes within the same L6474 series or compatible SPIN family devices. Verify pin compatibility and electrical parameter alignment before substitution. Consult official change notices for any process modifications affecting performance.