Toshiba Expands CMOS Comparators for Overcurrent Protection

Fast and reliable overcurrent detection remains critical in industrial automation, power electronics, and energy systems, where delayed shutdown can lead to equipment damage or safety risks. In this context, Toshiba Electronics Europe GmbH has introduced the TC75W71FU and expanded its TC75W comparator series for high-speed protection in industrial equipment.

Faster response for real-time shutdown protection
The TC75W71FU is designed to reduce propagation delay in overcurrent detection circuits, enabling faster system response during fault conditions. The device achieves a maximum delay of 45 ns for low-to-high transitions and 30 ns for high-to-low transitions, compared to 550 ns and 250 ns respectively in the earlier TC75W56FU.

This reduction in delay allows protection circuits to trigger shutdown mechanisms more quickly, limiting exposure to overcurrent conditions in applications such as industrial robots, photovoltaic systems, uninterruptible power supplies, and transformers. Faster response times directly improve system-level safety by minimizing thermal and electrical stress on components.

Rail-to-rail operation and low-voltage compatibility
The TC75W71FU supports full rail-to-rail input and output operation, enabling signal handling across the entire supply voltage range from ground to Vcc. This simplifies circuit design by eliminating the need for additional level-shifting components in many configurations.

The device operates with a minimum supply voltage of 1.8 V, making it suitable for low-power and mixed-voltage environments commonly found in embedded control systems and distributed industrial electronics. This flexibility supports integration into compact designs where power constraints and signal compatibility are critical.

Series expansion adds noise immunity and interface flexibility
Following the introduction of the TC75W71FU, two additional variants in the TC75W series were scheduled for series production in February 2026. The TC75W72FU incorporates increased hysteresis, improving noise immunity in electrically noisy environments such as motor drives and switching power systems.

The TC75W73FU adds both hysteresis and an open-drain output configuration, allowing output signals to interface with voltage domains beyond the comparator’s supply range. This feature is particularly relevant in systems where multiple voltage rails are present, enabling more flexible signal routing within an industrial automation architecture.

Operating range and packaging for industrial deployment
All devices in the TC75W series are housed in an SOT-505 (SM8) package, supporting compact PCB layouts. The comparators operate across a temperature range of -40 to 125 °C and support supply voltages from 1.8 V to 5.5 V, aligning with requirements for industrial and consumer electronics, including household appliances and power supply units.

Role in industrial safety and power system design
The expansion of the TC75W series reflects the increasing demand for high-speed, low-voltage protection components in modern electronic systems. As industrial equipment becomes more compact and distributed, overcurrent protection circuits must respond within nanosecond-scale timeframes to prevent cascading failures.

By combining reduced propagation delay, rail-to-rail operation, and configurable hysteresis, these comparators support safer and more reliable system design across industrial automation, renewable energy systems, and power management applications.

Edited by Aishwarya Mambet, Induportals Editor, with AI assistance.

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