Basic application and pin identification of three-terminal regulator

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Shunuo varistor / ESD varistor / product complete / Sunlord first-class agent

Photocoupler

The following figure illustrates the basic application circuit of the W7800 series three-terminal voltage regulators. These devices are widely used in power supply circuits for their stability and reliability. Understanding their configuration helps in proper implementation in various electronic systems.

This image shows a symmetrical output voltage regulation circuit using both W7800 (positive) and W7900 (negative) series three-terminal regulators. This configuration is ideal for applications requiring balanced positive and negative voltages, such as in audio amplifiers or certain types of power supplies.

Below is the basic application circuit for the W317 adjustable output regulator. Unlike fixed-voltage regulators, the W317 allows users to adjust the output voltage using an external resistor network, making it highly flexible for different power requirements.

Three-terminal voltage regulators typically come in two main package types: metal can packages, which resemble traditional power transistors, and plastic packages, often used for smaller or medium-power applications. It’s important to note that the pin functions may vary between different models and manufacturers. Always refer to the datasheet before connecting the regulator to a circuit to avoid damage to the IC or other components.

To help with identification and proper usage, the following figure provides a detailed pinout and function description for commonly used three-terminal regulators. This guide is especially useful for engineers and hobbyists working on power supply designs.