KA278R33TU

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

The KA278R33TU is a fixed positive low-dropout voltage regulator manufactured by Fairchild Semiconductor, now part of onsemi. It provides a stable 3.3 V output with a maximum current capacity of 2 A. The device operates within an input voltage range of 4 V to 10 V and features a maximum dropout voltage of 500 mV at full load. It includes internal protections such as peak current limiting, thermal shutdown, and safe operating area protection. The component is housed in a TO-220-4 through-hole package and supports an operating temperature range from -20 °C to +80 °C.

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

• Integrated peak current protection and thermal shutdown for enhanced reliability
• Low dropout voltage capability ensuring efficient regulation under varying loads
• Fixed 3.3 V output configuration suitable for standard digital logic supplies

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

• AC to DC multi-output power supply reference designs
• General purpose electronic equipment requiring stable 3.3 V rails
• DVD receiver applications utilizing quasi-resonant topologies

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

Verify the manufacturer status carefully as this component may be listed as obsolete or discontinued by onsemi. Confirm availability through authorized distributors or surplus suppliers. Ensure the specific suffix TU corresponds to the TO-220-4 package variant required for your PCB layout. Cross-reference datasheet revisions to confirm pinout compatibility if substituting older Fairchild stock.

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

Select this regulator when a fixed 3.3 V output at up to 2 A is required with minimal external components. The TO-220-4 package facilitates through-hole mounting and heat dissipation for moderate power applications. Consider the 4 V minimum input voltage constraint to ensure adequate headroom. Verify that the 500 mV dropout specification meets the system's efficiency requirements under maximum load conditions.

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

This component belongs to the KA278RXXC series of low-dropout voltage regulators designed for various electronic equipments. The series offers multiple fixed output voltages including 3.3 V, 5 V, 9 V, and 12 V variants. These regulators are characterized by their robust protection features and suitability for applications requiring reliable linear regulation in compact form factors.

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

KA278R33CTU is a confirmed substitute part number representing the same functional specifications.