KA278RA05CTU

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

The KA278RA05CTU is a low-dropout voltage regulator from the KA278RXXC-Series by onsemi, housed in a TO-220F 4L package. It provides a nominal 5 V output with an adjustable range between 1.27 V and 32 V. The device supports up to 2 A output current with a maximum dropout voltage of 0.5 V at full load. Electrical characteristics include a reference voltage of 1.27 V, line regulation of 2.5%, and load regulation of 2%. Operating temperature ranges from -20°C to +80°C.

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

• Integrated over-current protection, thermal shutdown, and short-circuit protection for enhanced reliability.
• Features an output disable function controlled via the dedicated Vdis pin.
• Provides stable constant voltage power source suitable for various electronic equipment.

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

• Constant voltage power sources for general electronic equipment
• Adjustable voltage regulation circuits requiring high current capability
• Power management systems utilizing the output disable feature

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

Verify component authenticity through authorized distributors or direct manufacturer channels due to counterfeiting risks. Confirm that the ordering suffix matches the specific package variant (TO-220F 4L) required for your design. Ensure compliance with RoHS directives as specified in the datasheet documentation before finalizing procurement orders.

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

Select this component when a fixed 5 V output or adjustable regulation up to 32 V is needed with 2 A capacity. The TO-220F 4L package facilitates through-hole mounting and heat dissipation. Consider the internal resistor configuration for fixed mode operation versus external resistors for adjustable applications within the specified voltage range.

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

This part belongs to the KA278RXXC-Series, which includes fixed output variants like the KA278R05CTU. Unlike the fixed versions, the KA278RA05CTU allows output adjustment while maintaining the same 2 A rating and protection features. It shares the TO-220F 4L physical footprint with other series members but differs in internal feedback network configuration.

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

KA278R05CTU serves as a fixed 5 V alternative if adjustment is not required. Verify pin compatibility and thermal performance requirements when substituting. Check for updated part numbers resulting from Fairchild Semiconductor integration into ON Semiconductor.

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

How is the output voltage adjusted?

The output voltage is adjustable between 1.27 V and 32 V using external resistors connected to the Vadj pin, allowing customization beyond the nominal 5 V setting.

What is the purpose of the fourth pin?

Pin 4 is the Vdis (Disable) pin, which allows the user to enable or disable the regulator output by applying specific voltage levels to this terminal.