KA378R05TU

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

The KA378R05TU is a low-dropout (LDO) linear voltage regulator manufactured by Fairchild Semiconductor, now part of onsemi. It provides a fixed positive output voltage of 5V with a maximum output current capability of 1A. The device is housed in a TO-220F package and operates within an ambient temperature range of -40°C to +125°C. Key electrical specifications include a line regulation of 0.2% and load regulation of 0.4%. The input voltage range extends up to 35V, ensuring stable performance across varying supply conditions.

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

• Low dropout operation for efficient power conversion
• Fixed 5V positive output voltage
• Integrated thermal overload protection
• Safe operating area compensation

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

• Portable equipment requiring stable power supplies
• Battery-powered systems
• General-purpose linear regulation circuits

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

Verify the manufacturer marking as Fairchild or onsemi, as production rights transferred. Confirm the suffix TU indicates the TO-220F package variant. Check for RoHS compliance status depending on the manufacturing date code. Ensure the component is sourced from authorized distributors to avoid counterfeits, especially given the legacy status of some Fairchild products.

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

Select this component when a fixed 5V output is required with moderate current demands up to 1A. Consider the thermal dissipation capabilities of the TO-220F package relative to the expected power loss. Evaluate the input voltage range against the system's supply rails to ensure the dropout voltage remains within acceptable limits for stable regulation under all operating conditions.

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

This LDO regulator belongs to the KA378R series, designed for applications needing reliable, low-noise power sources. The TO-220F package offers robust mechanical stability and adequate heat sinking potential. As a legacy product from Fairchild Semiconductor, it serves as a standard solution in established designs where pin compatibility and proven reliability are prioritized over newer, more integrated alternatives.

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

Direct substitutes may include other 5V LDOs in TO-220 packages from various manufacturers, provided pinouts and electrical characteristics match. Verify that any replacement maintains the same current rating and dropout voltage specifications. Cross-reference datasheets for thermal resistance values to ensure equivalent heat management capabilities in the existing enclosure design.