ONSEMI FOD852 4 Pin DIP Photodarlington Optocoupler, 50mA, 5kV

The ONSEMI FOD852 is a high-performance 4-pin Photodarlington Output Optocoupler designed to provide reliable signal isolation in demanding electronic circuits. It integrates a gallium arsenide infrared emitting diode with a silicon photodarlington output, which includes an integral base-emitter resistor for enhanced stability. This component is engineered for applications requiring robust electrical isolation and high current transfer efficiency.

A key feature is its exceptionally high current transfer ratio (CTR) of 1000% minimum, allowing for efficient control of output stages with minimal input current. It offers a high input-output isolation voltage of 5000Vrms, providing critical protection against voltage surges and ensuring safety in mains-connected or high-voltage environments. The device is also capable of operating at temperatures up to 100°C, making it suitable for industrial settings.

Primary Applications

This optocoupler is ideally suited for power management systems, where it can provide feedback isolation in switch-mode power supplies. It is also commonly used in consumer electronics for signal isolation, in motor drive control circuits to separate logic and power stages, and across various industrial automation and control applications. Its construction is compatible with IR reflow soldering processes, facilitating efficient, high-volume PCB assembly.

Key Specifications

• Channel Configuration: Single channel for isolated signal transmission.
• Package Type: Standard 4-pin Dual In-line Package (DIP) for through-hole mounting.
• Maximum Forward Current: 50mA, defining the drive capability of the input LED.
• Collector-Emitter Voltage: 300V (V(br)ceo), indicating the output transistor's voltage rating.
• Dimensions: Compact form factor measuring 43mm in height, 33mm in width, and 15mm in depth.
• Weight: Lightweight design at