TA8428K(O,S)

Overview

The TA8428K(O,S) is a dual H-bridge motor driver integrated circuit manufactured by Toshiba Semiconductor and Storage. Designed for small to medium power brushed DC motors, it integrates two independent H-bridges capable of bidirectional PWM control. The device features built-in level shifters, dead-time generation, over-current protection, thermal shutdown, and under-voltage lockout. It accepts TTL/CMOS compatible logic inputs and provides high-side gate drive via an internal charge pump. Key electrical specifications include a continuous output current of 2.0A per channel at 25°C ambient temperature and a peak current capability of 3.5A for 10ms pulses. The operating supply voltage range typically spans from 4.5V to 36V.

Feature Summary

• Dual independent H-bridge architecture enabling simultaneous control of two DC motors or one stepper motor.
• Integrated protection mechanisms including over-current detection, thermal shutdown, and under-voltage lockout to ensure system reliability.
• Built-in charge pump and dead-time generator to prevent shoot-through currents and simplify external component requirements.
• Direct interface compatibility with standard microcontroller GPIOs through TTL/CMOS logic input levels.

Applications

• Mobile robot chassis drive systems requiring precise differential steering.
• Smart door lock actuation mechanisms needing reliable bidirectional rotation.
• Industrial valve controllers utilizing PWM for flow regulation.

Procurement Notes

Verify the specific suffix (O or S) against the manufacturer's latest datasheet to confirm package type and tape/reel specifications. Confirm that the required supply voltage and current ratings align with the target motor load before integration. Ensure proper heatsinking is designed if operating near the maximum continuous current limits. Check for end-of-life status as older Toshiba semiconductor lines may have discontinued variants.

Selection Notes

Select this component when a compact solution for driving two brushed DC motors is required without discrete MOSFETs. It is suitable for embedded systems where board space is limited and integrated protection features reduce design complexity. Consider alternative models if higher current capacity or three-phase motor support is needed. Verify that the logic voltage levels match the controlling microcontroller's output standards.

Part Context

The TA8428 series belongs to Toshiba's dedicated motor driver family, focusing on simplified implementation of H-bridge circuits. It replaces complex discrete designs by integrating power switches and control logic into a single package. This integration reduces parasitic inductance and timing skew risks associated with separate components. The series is widely used in consumer electronics and industrial automation where cost-effective and robust motor control is essential.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should consult Toshiba's official replacement guide or contact technical support directly for qualified alternatives. Cross-referencing pinouts and electrical characteristics with potential substitutes is mandatory to ensure functional compatibility.