Bourns TVS Thyristor Surge Protector 240V 2 Pin DO-214AA (SMB)

The Bourns TVS Thyristor Surge Protector 240V 2 Pin is a bidirectional, voltage-triggered thyristor surge protector designed to limit dangerous overvoltage spikes on telecommunications lines.

Overview

This compact 2-point protection device is typically used to safeguard 2-wire telecommunications equipment such as telephones and modems. It is installed between the ring and tip wires, where it shunts harmful surges away from connected equipment. Overvoltage spikes on telephone lines are commonly induced by AC power system disturbances or lightning strikes. For more complex systems, multiple devices can be combined to create multi-point protection networks, for example offering 3-point protection between ring, tip and ground lines.

Core Technology and Operation

The protector uses a symmetrical, voltage-triggered bidirectional thyristor. When an overvoltage occurs, the device first clamps the spike through breakdown clamping. If the voltage continues to rise to the breakover level, the device crowbars into a low-voltage on state, diverting the surge current through the thyristor. A high crowbar holding current helps to prevent DC latchup as the diverted current subsides, allowing the device to reset correctly.

Key Features

• Ion-implanted breakdown region for precise and stable voltage characteristics
• Consistent protection thresholds
• Low voltage overshoots under surge, minimising voltage let-through during transient events
• Compact DO-214AA (SMB) package designed for industrial applications and demanding environments

Dimensions and Weight

Width 3.3, depth 1.5, height 4.3, with a weight of 0.168 g.

Choose this Bourns TVS thyristor when you need a compact, 2-pin surge protection device for telecommunications line applications.