KA78RM33TU

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The KA78RM33TU is a fixed positive low-dropout voltage regulator providing a 3.3V output with a maximum current of 0.5A. It operates within an input voltage range of 4.3V to 16V and supports junction temperatures from -25°C to +125°C. The device features a dropout voltage of 0.6V at full load, line regulation of 20mV, and load regulation of 20mV. Quiescent current is typically 5mA. It includes overcurrent protection, thermal shutdown, and SOA protection.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Provides stable 3.3V power supply with low dropout characteristics for efficient voltage conversion.
• Integrates comprehensive protection mechanisms including overcurrent limiting, thermal shutdown, and safe operating area safeguards.
• Designed for surface-mount applications using D-PAK or through-hole TO-220 packages.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Constant voltage power sources for electronic equipment
• Battery-powered systems requiring low dropout performance
• General-purpose linear regulation in consumer electronics

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and packing method. The 'TU' suffix indicates a TO-220 rail package. Confirm availability status as this component may be discontinued or subject to lifecycle changes. Ensure compatibility with required thermal management solutions given the internal power dissipation limits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator when a fixed 3.3V output is required with moderate current demands up to 0.5A. Consider the thermal resistance of 110 °C/W without a heatsink when designing for high ambient temperatures. Verify that the input voltage remains within the specified 4.3V to 16V range to ensure proper regulation and protection functionality.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the KA78RM33 series of low-dropout regulators originally manufactured by Fairchild Semiconductor. The series offers fixed output voltages with integrated protection features. The TO-220 package variant provides robust thermal performance for through-hole mounting applications in industrial and commercial power management designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Check for direct pin-compatible alternatives in the KA78RMxx family. Verify if updated revisions from onsemi or other manufacturers offer equivalent electrical specifications and protection features. Ensure any substitute maintains the same dropout voltage and current capabilities for circuit compatibility.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the maximum dropout voltage for the KA78RM33TU?

The maximum dropout voltage is 0.6V when delivering the full rated output current of 0.5A.

Does the KA78RM33TU include thermal protection?

Yes, the device incorporates thermal shutdown protection to prevent damage during overheating conditions.