STK672-440B-E

Overview

The STK672-440B-E is a thick-film hybrid IC designed for unipolar, two-phase stepper motor applications with PWM current control. It integrates MOSFET power devices and includes built-in protection mechanisms such as overcurrent detection and overheat shutdown. The device features an active-low fault signal output and a power-on reset function. It supports Schmitt trigger inputs compatible with 2.5V high-level logic levels. Motor current is adjustable via external resistors in conjunction with an internal current detection resistor. The enable pin allows for excitation mode maintenance while cutting output current.

Feature Summary

• Built-in overcurrent and overheat detection functions that automatically turn off the output current upon fault conditions.
• Active-low fault signal output to indicate system anomalies such as overcurrent or thermal events.
• Power-on reset function ensures reliable initialization of the driver circuitry.
• Phase signal input driver activated by active-low signals with simultaneous on prevention to avoid shoot-through.

Applications

• Office photocopiers
• Printers

Procurement Notes

Verify the manufacturer designation carefully, as this component has been associated with both Sanyo Semiconductor and onsemi in public documentation. Confirm the specific datasheet version matches the required electrical characteristics and pinout configuration. Ensure the ordering suffix corresponds to the exact package and tape-and-reel specifications required for your assembly process. Cross-reference the part number against official distributor catalogs to confirm availability and authenticity before procurement.

Selection Notes

Select this component for applications requiring a robust, hybrid-integrated solution for two-phase unipolar stepper motors. It is suitable where built-in protection against overcurrent and overheating is critical for system reliability. The inclusion of Schmitt trigger inputs simplifies interface design with standard logic controllers. Consider the external resistor requirements for setting the motor current when designing the surrounding circuitry.

Part Context

The STK672 series comprises thick-film hybrid integrated circuits primarily intended for driving stepping motors. These devices combine power MOSFETs with control logic on a single substrate to provide compact and efficient motor drive solutions. The series typically offers various current ratings and feature sets tailored for office automation equipment and industrial control systems requiring precise motor positioning.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing designs by comparing absolute maximum ratings, pin configurations, and functional specifications with alternative drivers from the same manufacturer or other vendors.