The CNX35 is an optocoupler manufactured by Fairchild Semiconductor, now part of ON Semiconductor. An optocoupler, also known as an optoisolator, provides electrical isolation between two circuits using an optical signal. This isolation is crucial in protecting sensitive circuits from high voltages or electrical noise in other parts of the system. The CNX35 is designed for various isolation applications, offering a reliable and safe means of signal transfer.

Applications

• Power supplies: Used for isolating control signals from the power circuit.
• Motor control: Provides isolation between the control logic and the motor drive circuitry.
• Industrial control systems: Protects control systems from voltage transients and noise.
• Data communication: Isolates communication interfaces to prevent ground loops.
• Medical equipment: Ensures patient safety by isolating sensitive medical devices from potentially hazardous voltages.

Features

• High isolation voltage: Provides a high level of electrical isolation between the input and output.
• Compact package: Allows for space-saving design on PCBs.
• High current transfer ratio (CTR): Ensures efficient signal transfer.
• Fast switching speed: Suitable for high-speed applications.
• Low input current: Minimizes power consumption.
• Safety certifications: Meets safety standards for electrical isolation.

Benefits

• Electrical isolation: Protects sensitive circuits from high voltages and noise.
• Improved system reliability: Prevents ground loops and reduces the risk of damage from voltage transients.
• Enhanced safety: Ensures safety in applications where electrical isolation is critical.
• Simplified system design: Isolates different parts of the system, simplifying the design process.
• Reduced noise: Minimizes noise coupling between circuits.

Additional Details

The CNX35 typically consists of an LED and a phototransistor or phototriac within a single package. The LED emits light when current is applied, and this light activates the phototransistor or phototriac, allowing current to flow in the output circuit. The isolation voltage is a key parameter, indicating the maximum voltage that the optocoupler can withstand between the input and output. The current transfer ratio (CTR) specifies the ratio of the output current to the input current. The CNX35 meets various safety standards, such as UL, VDE, and CSA, ensuring compliance with safety regulations. Note that this is an end-of-life product, so availability may be limited.