STK672-440BN-E

Overview

The STK672-440BN-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. The device incorporates built-in protection mechanisms, including overcurrent and overheat detection functions that trigger an active low fault signal and cut off output current when thresholds are exceeded. It features a power-on reset function and Schmitt trigger inputs compatible with 2.5V logic levels. The IC supports pin compatibility with the STK672-732AN-E series.

Feature Summary

• Built-in overcurrent and overheat detection with automatic output cutoff
• Active low fault signal output for system monitoring
• Power-on reset function for reliable initialization
• Schmitt trigger inputs supporting 2.5V high level input

Applications

• Office photocopiers
• Printers
• X-Y plotters

Procurement Notes

Verify the specific suffix 'BN' against official onsemi documentation to confirm exact marking and package variant. Ensure the design accounts for the required external current setting resistors, noting the internal detection resistor tolerance of ±2%. Confirm thermal management requirements based on the allowable power dissipation ratings at the specified case temperature.

Selection Notes

Select this component for applications requiring a robust 2-phase stepper driver with integrated safety protections. The built-in fault detection simplifies system design by removing the need for external monitoring circuits. Verify that the external control signals meet the Schmitt trigger input specifications and that the available supply voltages align with the absolute maximum ratings.

Part Context

This part belongs to the STK672 family of thick-film hybrid ICs from Sanyo Semicon Device (now onsemi). These devices are specialized for driving stepping motors in office automation equipment. The family includes variants for different phase configurations and current capabilities, such as the 4-phase STK672-040 and other 2-phase drivers like the STK672-740AN-E.

Replacement Considerations

The datasheet indicates pin compatibility with the STK672-732AN-E. Designers should verify electrical parameter alignment before substitution.