STK672-640AN-E

Overview

The STK672-640AN-E is a thick-film hybrid IC designed as a unipolar, two-phase stepping motor driver with PWM current control. It features built-in protection mechanisms including overcurrent detection, overheat detection, and motor terminal open detection, which trigger an output current cutoff upon activation. The device outputs active-low fault signals to indicate these error conditions. It incorporates a power-on reset function and supports Schmitt input characteristics for reliable signal processing. The component utilizes MOSFET power devices in its output stage to manage motor drive currents efficiently.

Feature Summary

• Built-in overcurrent, overheat, and motor terminal open detection functions that automatically cut off output current when faults occur.
• Active-low fault signal output provides clear indication of detected error conditions such as overcurrent or overheating.
• Integrated power-on reset function ensures stable initialization and operation upon power application.
• Supports Schmitt input characteristics to maintain signal integrity and prevent false triggering from noisy inputs.

Applications

• Office photocopiers
• Printers

Procurement Notes

Verify the exact part number suffix against official onsemi documentation to confirm specific thermal or electrical variants. Ensure compatibility with existing PCB footprints and thermal management requirements. Confirm availability through authorized distributors only to guarantee authenticity. Check for any recent lifecycle status changes or obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component for applications requiring robust protection features in two-phase stepper motor drives. Consider its hybrid IC construction for high reliability in industrial environments. Evaluate thermal dissipation needs based on the expected load current and ambient temperature conditions. Ensure the control circuitry can interface correctly with the active-low fault outputs and Schmitt-triggered inputs.

Part Context

This part belongs to the STK672 series of thick-film hybrid ICs manufactured by onsemi (formerly Sanyo Semiconductor). These drivers are specifically engineered for unipolar stepping motors using PWM current control. The series is widely recognized for integrating power MOSFETs and control logic into a single package, simplifying design for office automation equipment.

Replacement Considerations

Public confirmed substitute part numbers: STK672-640B-E.