The TLP2168 is a solid-state relay (SSR) from Toshiba Semiconductor and Storage. It's designed for applications requiring electrical isolation between control and load circuits. This SSR utilizes an infrared LED optically coupled to a MOSFET to provide switching functionality with high isolation voltage and low on-resistance.

Applications

• Industrial control systems
• Programmable logic controllers (PLCs)
• Temperature controllers
• Lighting control systems
• AC/DC power switches

Features

• Solid-state relay (SSR)
• Normally Open (1-Form-A) contact configuration
• Load voltage: Up to 400V
• Load current: Up to 120mA
• Isolation voltage: 5000 Vrms (min)
• Low on-resistance: 35 Ohms (typ.)
• Operating temperature: -40°C to 100°C
• Small package: 4-pin DIP

Benefits

• Electrical Isolation: Provides a high level of isolation between the control and load circuits, protecting sensitive components.
• Long Life: Solid-state design eliminates mechanical contacts, resulting in a longer lifespan compared to electromechanical relays.
• Fast Switching Speed: Offers faster switching speeds compared to electromechanical relays.
• Low Power Consumption: Requires minimal control current for activation.
• Compact Size: Small DIP package saves board space.
• Reliable Operation: Resistant to vibration and shock.
• No Contact Bounce: Eliminates contact bounce associated with mechanical relays, reducing electrical noise.

Additional Details

The TLP2168 is activated by applying a forward current to the input LED. This current illuminates the LED, which in turn activates the internal MOSFET, closing the output circuit. When the LED current is removed, the MOSFET turns off, opening the output circuit. The SSR's high isolation voltage ensures that the control circuit is electrically isolated from the load circuit, protecting sensitive control circuitry from high voltages or transients. The low on-resistance minimizes power dissipation across the switch, improving efficiency. The device is designed to operate over a wide temperature range, making it suitable for industrial applications. Proper derating should be considered at higher temperatures. The TLP2168 is a robust and reliable alternative to electromechanical relays in many applications, offering superior performance and longevity. Its small size and ease of use make it a popular choice for modern electronic designs.