KA378R05TU

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

The KA378R05TU is a low-dropout voltage regulator manufactured by onsemi, providing a fixed 5V output with a maximum current of 3A. It operates within an input voltage range of 6V to 12V and features a dropout voltage below 0.5V at full rated current. The device includes overcurrent protection, thermal shutdown, overvoltage protection, short-circuit protection, and an output disable function. It is housed in a TO-220F-4L package and supports an operating temperature range from -20°C to +80°C.

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

• Integrated safety mechanisms including peak current protection, thermal shutdown, overvoltage protection, and short-circuit protection.
• Features an output disable function allowing for high/low output control via the Vdis pin.
• Low dropout voltage performance maintaining regulation under full rated load conditions.

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

• Constant voltage power sources for various electronic equipment
• Power supply systems requiring low dropout characteristics
• Applications necessitating integrated thermal and current protection

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

Verify the exact part number suffix and manufacturer documentation before procurement, as Fairchild Semiconductor part numbers may have been updated to ON Semiconductor nomenclature following integration. Confirm availability status directly with authorized distributors or the manufacturer, as specific stock levels and lead times are not provided in public datasheets. Ensure compliance with RoHS and REACH requirements relevant to your region.

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

Select this component when a fixed 5V output at up to 3A is required with low dropout capability. Consider the TO-220F-4L package for through-hole mounting and adequate heat dissipation. Evaluate the need for the output disable feature and integrated protection circuits against alternative regulators that may lack these specific functions or require external components.

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

The KA378R05 belongs to the KA378R series of low-dropout voltage regulators originally developed by Fairchild Semiconductor and now managed by onsemi. This series is designed for applications requiring stable voltage regulation with built-in safety features. The transition from Fairchild to onsemi involves updates to ordering information and system nomenclature, but the core electrical specifications and functionality remain consistent with the original design.

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

Check for direct equivalents within the KA378R series or other 3A LDOs with similar pinouts and protection features. Verify that any replacement matches the TO-220F-4L package dimensions and electrical characteristics, particularly dropout voltage and disable logic levels.

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

What is the purpose of the fourth pin (Vdis) on the TO-220F-4L package?

The fourth pin is the Disable pin (Vdis), which allows the user to enable or disable the output voltage. Applying a high voltage activates the output, while a low voltage disables it.

Does the KA378R05 include thermal protection?

Yes, the device includes thermal shutdown protection that activates at 150°C to prevent damage from excessive junction temperatures.