SLA7078MS

Overview

The SLA7078MS is a 2-Phase Unipolar Stepper Motor Driver manufactured by Sanken Electric. It integrates low-power CMOS logic with high-current, high-voltage power FET outputs to provide complete control and drive for two-phase unipolar stepper motors. The device features internal fixed off time and pulse-width modulation (PWM) control of the output current within a Power Multi-Chip Module (PMCM). It supports full-, half-, quarter-, eighth-, and sixteenth-step operation externally selectable. The NMOS outputs are capable of sinking up to 3 A and withstanding 46 V in the off state.

Feature Summary

• Integrates CMOS logic sequencing with high-current power FET outputs for direct motor control without complex interfaces.
• Supports multiple step modes including full, half, quarter, eighth, and sixteenth-step operation via external selection.
• Features built-in PWM current control with user-selectable reference voltage and sensing resistor configuration.
• Includes clamp diodes for protection against inductive transients and requires no special power-up sequencing.

Applications

• Personal Computer Peripherals (PPC)
• Printers
• Office Automation Equipment

Procurement Notes

Verify the exact suffix 'MS' against official Sanken Electric documentation to confirm package type and availability status. Cross-reference with distributor listings for lead times and regional restrictions. Ensure the component matches the specific PMCM package requirements for your design. Confirm RoHS compliance details through the manufacturer's latest datasheet or certification documents before finalizing procurement.

Selection Notes

Select this driver when driving two-phase unipolar stepper motors requiring micro-stepping capabilities up to sixteenth-step resolution. It is suitable for applications where a complex microprocessor is unavailable or overburdened, as it handles sequencing internally. Ensure the load supply voltage does not exceed 44 V and the logic supply remains between 3 V and 5.5 V. Verify that the required output current sink capability aligns with the 3 A maximum rating of the NMOS outputs.

Part Context

The SLA7078MS belongs to the SLA707xM series of 2-Phase Unipolar Stepper Motor Drivers from Sanken Electric. This family combines CMOS logic with power FETs in a multi-chip module. Other members include SLA7070M through SLA7077M, which may offer different current ratings or step mode support. The series is designed for compact, efficient motor control in office and peripheral equipment.

Replacement Considerations

SLA7078MR is a documented similar part number within the same Sanken Electric series offering identical functional descriptions regarding excitation support and sequencer integration. Verify package compatibility and electrical specifications before substitution.