TB6674FAG

Overview

The TB6674FAG is a two-phase bipolar stepping motor driver IC manufactured by Toshiba Semiconductor and Storage. It integrates power MOSFETs in a parallel configuration to drive induced loads, supporting both start currents up to 350 mA and hold currents up to 100 mA. The device operates with a supply voltage range of 4.5 V to 5.5 V and supports load voltages from 2.7 V to 22 V. It features TTL-compatible inputs for INA, INB, and PS pins, along with built-in punch-through current restriction circuits for system reliability and noise suppression. The component is housed in a 16-pin SSOP package.

Feature Summary

• Integrates dual-bridge driver architecture for bipolar driving of induced loads
• Includes power-saving and standby operation modes to reduce consumption
• Features built-in punch-through current restriction for noise suppression
• Supports TTL-compatible input signals for direct logic interface

Applications

• 3.5-inch floppy disk drive head actuator drives
• 5.25-inch floppy disk drive head actuator drives
• General-purpose stepper motor control systems requiring low power consumption

Procurement Notes

Verify the specific suffix 'FAG' against official Toshiba documentation to confirm lead-free status and pinout compatibility. Ensure the design accommodates the 16-SSOP package dimensions and thermal requirements. Confirm that the application logic aligns with the TTL-compatible input specifications before finalizing procurement.

Selection Notes

Select this component when designing systems for 3.5 or 5.25-inch FDD applications requiring integrated bipolar drive capabilities. It is suitable for designs prioritizing reduced set size and lower power consumption through standby modes. Verify that the required hold and start currents fit within the specified limits for the selected enable configurations.

Part Context

This part belongs to the TA7774 series of bipolar linear integrated circuits designed specifically for floppy disk drive actuators. It represents a silicon monolithic solution combining control and power stages. The 'FAG' designation typically indicates a lead-free product variant within the broader TA7774 family, sharing core functional characteristics with other suffixes like P, PG, F, and FG.

Replacement Considerations

Official substitutes within the same family include TB6674FG, TB6674PG, and TA7774P/PG/F variants. Verify pinout compatibility and electrical parameter alignment, particularly regarding output current ratings and package type differences between HSOP and DIP configurations.