The PS2561L2-1 WH is a high-density mounting type photocoupler manufactured by NEC (now Renesas). It's designed for signal transmission between circuits with different voltage levels or isolation requirements.

Applications:

• Programmable Logic Controllers (PLCs)
• Inverter Control
• Factory Automation Equipment
• Office Automation Equipment
• Measuring Instruments
• Power Supplies

Features:

• High isolation voltage (typically 5000 Vrms)
• Compact package for high-density mounting
• Current transfer ratio (CTR) of typically 50-400%
• Operating temperature range of -55°C to +100°C
• Lead-free construction

Benefits:

• Provides electrical isolation between input and output circuits
• Protects sensitive circuits from high-voltage transients
• Enables safe and reliable signal transmission
• Reduces ground loop noise
• Contributes to system safety and reliability

Additional Details:

The PS2561L2-1 WH consists of an LED on the input side and a phototransistor on the output side. When current flows through the LED, it emits light, which activates the phototransistor, allowing current to flow in the output circuit. The amount of current transferred is determined by the current transfer ratio (CTR). The high isolation voltage ensures that there is no electrical connection between the input and output circuits, providing a high degree of safety. This photocoupler is commonly used in industrial control systems, power supplies, and other applications where electrical isolation is required. It features through hole mounting with specific lead forming (WH designation) to provide reliable spacing between component leads and the PCB.