Fairchild Semiconductor AN-3008 RC Snubber Networks Application Note

About this manual

RC snubber networks are used to control voltage transients that could falsely turn on a thyristor. The document discusses how these networks form a series CRL circuit with the load inductance and explains the theory behind their operation.

The note details factors influencing static turn-on, such as device physics, temperature, and junction capacitance. It provides guidance on improving static capability using external resistors or capacitors for sensitive gate devices like TRIACS and SCRs.

What's inside

• Introduction
• Static dv/dt Turn-On
• Device Physics
• Conditions Influencing Static dv/dt
• Improving Static dv/dt
• TRIAC Commutating dv/dt
• Device Physics for TRIACs

Frequently asked questions

What is the recommended external resistor value for sensitive gate SCRs?

The recommended value of the resistor is 1000 ohms.

What range of resistance do sensitive gate TRIACS typically run with?

Sensitive gate TRIACS run between 100 and 1000 ohms.