STK672-642A-E

Overview

The STK672-642A-E is a thick-film hybrid integrated circuit designed as a two-phase stepper motor driver. It utilizes a unipolar configuration with PWM current control to drive external motors. The device integrates power MOSFETs for the output stage and includes built-in protection mechanisms such as overcurrent, overheat, and open detection functions. It operates within a supply voltage range of 10 V to 45 V and supports an output current capacity of up to 2.8 A. The component features a fault signal output for diagnostic purposes and is housed in a SIP package.

Feature Summary

• Integrates built-in overcurrent, overheat, and motor terminal open detection functions that automatically cut off output current upon fault conditions.
• Outputs active low fault signals to indicate the activation of internal protection circuits.
• Incorporates a power-on reset function to ensure stable initialization during operation.
• Supports Schmitt trigger inputs compatible with 2.5 V high-level logic signals.

Applications

• Office photocopiers
• Printers
• X-Y plotters

Procurement Notes

Verify the specific suffix and manufacturer origin carefully, as this component has been produced by both Sanyo Semicon Device and onsemi following corporate acquisitions. Confirm RoHS compliance status and check for end-of-life notifications or obsolescence notices before finalizing procurement plans. Ensure the ordering information matches the exact pinout and thermal requirements of your design.

Selection Notes

Select this driver for applications requiring robust protection features in unipolar stepper motor systems. It is suitable for designs needing integrated fault detection without external monitoring components. Consider the thermal dissipation capabilities and heat sink requirements when designing the PCB layout. Verify compatibility with the microstep driving signals if microstepping functionality is required.

Part Context

This component belongs to the STK672 series of thick-film hybrid ICs originally developed by Sanyo and later continued by onsemi. These drivers are widely used in office automation equipment. The part represents a mature technology solution for controlling two-phase stepping motors with integrated power stages and safety features.

Replacement Considerations

Public confirmed substitute part numbers include STK672-642AN-E and STK672-642A-E. Verify pin compatibility and electrical specifications against the original datasheet before substitution.