Light Activated SCR (LASCR)

Light Activated SCR (LASCR)

• The Light Activated SCR (LASCR) can be light-triggered, allowing it to operate without a traditional gate signal.
• LASCR is most sensitive to light in the neighborhood of 600 nm to 650 nm wavelengths, where its response to illumination is peak.

LASCR Functionality in OR Circuits

• When light is directed towards LASCR 1 or LASCR 2 in an OR circuit, either SCR can be triggered to turn on, enabling current flow through the load if enough light exposure occurs.
• The OR circuit configuration ensures that the actuation of one LASCR is sufficient to control the output, enhancing reliability and redundancy.

Triggering Mechanism in Latching Relays

• In latching relays, the LASCR is triggered by an applied light signal, which causes it to switch states and maintain the current flow even after the light source is removed.
• This light-triggering mechanism is crucial for remote control applications where electrical connections can be difficult.

Impact of Junction Temperature Increase

• When the junction temperature of the LASCR rises, it may lead to a decrease in the device's breakdown voltage, potentially making it more susceptible to unwanted triggering.
• Increased junction temperature affects overall performance and stability, necessitating careful thermal management in practical applications.