onsemi

KA78RM33

KA78RM33 Description

The KA78RM33 is a fixed output linear voltage regulator designed for applications requiring a stable 3.3V supply with a maximum output current of 500mA. Manufactured by onsemi, this regulator is part of the Power Management Integrated Circuits (PMIC) category and is housed in a Through Hole TO220-3 package. Despite being marked as obsolete, the KA78RM33 remains a reliable choice for various electronic systems due to its robust design and performance.

KA78RM33 Features

• Fixed Output Voltage: The KA78RM33 provides a stable 3.3V output, ensuring consistent power supply to connected devices.
• High Input Voltage Range: With a maximum input voltage of 20V, this regulator can handle a wide range of input voltages, making it versatile for different power sources.
• Low Dropout Voltage: The maximum dropout voltage of 0.6V at 500mA ensures efficient operation even when the input voltage is close to the output voltage.
• Low Quiescent Current: A quiescent current of only 5mA minimizes power consumption during standby, enhancing overall system efficiency.
• High Power Supply Rejection Ratio (PSRR): The 55dB PSRR at 120Hz helps in filtering out noise from the input power supply, resulting in cleaner output voltage.
• Protection Features: The KA78RM33 includes over-current, over-temperature, and short-circuit protection, safeguarding the regulator and connected components from damage.
• Moisture Sensitivity Level (MSL): Rated at MSL 1 (Unlimited), the regulator is suitable for use in environments with varying humidity levels.
• Compliance: The KA78RM33 is REACH unaffected, ensuring compliance with environmental regulations.

KA78RM33 Applications

The KA78RM33 is ideal for a variety of applications where a stable 3.3V supply is required. Its robust design and protection features make it suitable for:

• Embedded Systems: Providing a reliable power supply for microcontrollers, sensors, and other low-power devices.
• Communication Equipment: Ensuring stable power for communication modules and interfaces.
• Consumer Electronics: Suitable for powering devices such as routers, set-top boxes, and other consumer electronics that require a stable 3.3V supply.
• Industrial Control Systems: Ideal for applications where reliability and protection features are critical, such as PLCs and industrial sensors.

Conclusion of KA78RM33

The KA78RM33, despite being marked as obsolete, remains a reliable and efficient choice for applications requiring a stable 3.3V supply. Its low dropout voltage, high PSRR, and comprehensive protection features make it a robust solution for various electronic systems. The Through Hole TO220-3 package ensures easy integration into existing designs, while its compliance with environmental regulations ensures it meets industry standards. For applications where reliability and performance are paramount, the KA78RM33 is an excellent choice.