STK672-442A-E

Overview

The STK672-442A-E is a thick-film hybrid integrated circuit designed as a unipolar, 2-phase stepping motor driver. It utilizes PWM current control to manage motor excitation efficiently. The device integrates MOSFET power devices for output switching and includes built-in protection mechanisms such as overcurrent detection and overheat detection, which trigger an active low fault signal. It supports Schmitt trigger inputs compatible with 2.5V logic levels and incorporates a power-on reset function. The IC allows motor current setting via external resistors and features an enable pin to cut output current while maintaining the excitation mode.

Feature Summary

• Built-in overcurrent and overheat detection functions that deactivate output current upon fault conditions
• Active low fault signal output indicating detected anomalies
• Supports Schmitt input for 2.5V high level input compatibility
• Power-on reset function included for reliable initialization

Applications

• Office photocopiers
• Printers
• X-Y plotters

Procurement Notes

Verify the specific ordering suffix and manufacturer documentation when sourcing this component. Confirm that the received part matches the STK672-442A-E designation exactly, as variations in suffixes may indicate different thermal or electrical characteristics. Ensure the supplier provides valid traceability documents. Cross-reference the package type and pinout against the official datasheet to prevent installation errors. Check for any obsolescence notices or lifecycle status updates from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component for applications requiring a unipolar 2-phase stepper motor driver with integrated protection. It is suitable for systems needing simple control circuits with microstep operation support. Consider the external resistor requirements for current setting and the need for a 5V supply. Evaluate the thermal management requirements based on the allowable power dissipation ratings. Ensure the control logic voltage levels are compatible with the Schmitt trigger inputs.

Part Context

The STK672 series comprises thick-film hybrid ICs for stepping motor drivers. The STK672-442A-E belongs to the 2-phase driver subset, distinct from the 4-phase variants like the STK672-040. These components are manufactured by Sanyo Semicon Device, now part of onsemi. They are designed for high reliability in office automation equipment, offering constant-current chopper-type drive capabilities with built-in safety features.

Replacement Considerations

Check for direct substitutes within the STK672 family, such as the STK672-740AN-E, which shares similar 2-phase driver characteristics and compatible pins. Verify pin compatibility and functional equivalence before substitution. Consult the manufacturer's replacement guide for any updated models or discontinued part notifications.