STMicroelectronics 78S18 Positive Voltage Regulator 18V 2A TO-220

The STMicroelectronics 78S18 Positive Voltage Regulator provides a fixed 18V nominal output and a maximum output current of 2A when adequately heatsinked. It is a 3-terminal device in a TO-220 through-hole package, designed for local on-card regulation.

Overview

The regulator is intended for applications that require a stable 18V rail. Local regulation is provided to reduce the performance issues associated with remote, single-point power supplies. Internal current limiting, thermal shutdown, and safe operating area (SOA) protection are integrated to guard against overloads, excessive heat, and short circuits. When paired with an adequate heatsink, it can deliver a continuous output current of over 2A for more demanding circuits.

Key Features

• Fixed 18V nominal output voltage
• Input voltage range of 21V to 35V DC
• Maximum output current of 2A with sufficient heatsinking
• TO-220 through-hole package for mounting and heat dissipation
• 3 pins
• Operating temperature range of 0°C to 150°C
• Internal current limit, thermal shutdown, and safe area protection

Applications

While configured as a fixed-voltage regulator, it can be used with external components to create adjustable voltage and current supplies. Its primary role is power management in industrial systems, consumer electronics, and prototyping. The package measures 43 mm x 33 mm x 15 mm and is easy to integrate into new designs or use as a replacement component.

Specifications

• Weight: 2 g

Choose the STMicroelectronics 78S18 Positive Voltage Regulator when a fixed 18V rail with 2A output capability in a TO-220 package is required.