The UPC78N18H is a fixed positive voltage regulator manufactured by NEC. It is designed to provide a stable 18V output voltage from a higher input voltage. This regulator is part of the 78xx series, known for their simplicity and ease of use in various electronic applications.

Applications

• Power supplies for microcontrollers: Providing a stable 18V supply for MCUs and related circuitry.
• Linear regulation in electronic circuits: Stepping down and regulating voltage in various electronic devices.
• Battery charging circuits: Providing a constant voltage for charging batteries.
• Instrumentation: Used in test and measurement equipment requiring a stable voltage source.
• Industrial control systems: Providing regulated power to sensors and control elements.

Features

• Fixed 18V output: Provides a consistent and reliable 18V DC output.
• Internal thermal overload protection: Protects the regulator from overheating due to excessive power dissipation.
• Short-circuit current limiting: Limits the output current during short-circuit conditions, preventing damage to the regulator and connected circuitry.
• Output transistor safe-area compensation: Ensures stable operation over a wide range of operating conditions.
• No external components required: Simplifies circuit design and reduces the bill of materials.

Benefits

• Stable voltage supply: Ensures consistent performance of connected components by providing a regulated voltage.
• Protection against overloads: Prevents damage to the regulator and other components during overload conditions.
• Simplified circuit design: Reduces design complexity and component count.
• Reliable operation: Provides stable and dependable voltage regulation in various applications.
• Cost-effective solution: Offers a simple and inexpensive way to obtain a regulated 18V supply.

Additional Details

The UPC78N18H typically comes in a through-hole package like TO-220. It requires an input voltage higher than 18V to function correctly, typically a few volts above the output voltage. A heatsink might be necessary depending on the input voltage and output current to prevent overheating. Refer to the datasheet for specific thermal resistance and power dissipation ratings.