STK672-740A-E

Overview

The STK672-740A-E is a thick-film hybrid IC designed as a unipolar, 2-phase stepper motor driver with PWM current control. It features an integrated power-on reset function and supports Schmitt inputs for 2.5V high-level logic. The device incorporates simultaneous on prevention to protect against shoot-through conditions. Motor current is adjustable via two external resistors utilizing a built-in detection resistor. An enable pin allows output current cutoff while maintaining the excitation mode.

Feature Summary

• Built-in overcurrent and overheat detection functions that automatically turn off output current upon fault detection.
• Active low fault signal output indicating overcurrent or overheat conditions.
• Phase signal input driver activated by active low signals with simultaneous on prevention functionality.
• Supports Schmitt input characteristics compatible with 2.5V high-level input logic.

Applications

• Office photocopiers
• Printers

Procurement Notes

Verify the specific suffix 'A' against official manufacturer documentation to confirm exact electrical tolerances and package variations compared to standard variants. Ensure the ordering information matches the precise revision level required for your design. Cross-reference absolute maximum ratings with your system's operating conditions to prevent overstress. Confirm thermal management requirements based on the allowable power dissipation limits provided in the datasheet.

Selection Notes

Select this component for applications requiring a unipolar 2-phase stepper motor driver with integrated protection. The device supports microstep operation through its PWM current control mechanism. Verify compatibility with the target motor's voltage and current specifications. Ensure the control circuit provides active low phase signals and utilizes the enable pin for current management if needed.

Part Context

This part belongs to the STK672 series of thick-film hybrid ICs manufactured by onsemi (formerly ON Semiconductor). These components are specialized for driving stepping motors in office automation equipment. The series includes various models tailored for different phase configurations and current capabilities, serving as complete driver solutions with integrated MOSFET power devices.

Replacement Considerations

The STK672-732AN-E is documented as having compatible pins with the STK672-740AN-E series. Verify pinout compatibility and electrical specifications before substitution. No other public substitute part numbers are confirmed for this specific model.