SLA7077MPRT

Overview

The SLA7077MPRT is a two-phase unipolar stepper motor driver integrated circuit manufactured by Sanken Electric. It combines low-power CMOS logic with high-current, high-voltage power FET outputs to provide complete control and drive for 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 can sink up to 3 A and withstand 46 V in the off state. Logic supply voltage ranges from 3V to 5.5V, while load supply voltage operates between 10V and 44V.

Feature Summary

• Integrates CMOS sequencing logic with high-current power FET outputs for complete motor control
• Supports multiple step resolutions including full, half, quarter, eighth, and sixteenth steps
• Includes internal fixed off-time and PWM current control mechanisms
• Provides protection against inductive transients via built-in clamp diodes

Applications

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

Procurement Notes

Verify the specific suffix 'PRT' against official Sanken documentation to confirm package type and tape-and-reel configuration. Ensure compatibility with existing PCB footprints for the 23-pin package. Confirm that the 3A output capability aligns with the target motor's current requirements. Validate logic level interfaces for TTL or LSTTL compatibility if pull-up resistors are required.

Selection Notes

Select this component when driving two-phase unipolar stepper motors requiring high step resolution and integrated PWM control. It is suitable for applications where complex microprocessors are unavailable or overburdened. Consider the 3A output capacity and 46V blocking voltage for appropriate motor loads. Verify that the external step mode selection pins meet the system design requirements.

Part Context

The SLA7077MPRT belongs to the SLA707xM series of 2-Phase Unipolar Stepper Motor Drivers. This series is designed to simplify motor control by eliminating the need for phase-sequence tables or high-frequency control lines. The devices are part of Sanken's portfolio for office automation and peripheral equipment, offering a compact solution for precise motion control.

Replacement Considerations

Consult official Sanken Electric substitution guides for verified alternatives. Cross-reference pinouts and electrical specifications carefully before replacing.