CNY65 Optocoupler Technical Summary

Overview

The CNY65 is a high-performance optocoupler consisting of a gallium arsenide (GaAs) infrared emitting diode optically coupled to a silicon phototransistor. This component is designed to provide electrical isolation between input and output circuits, making it ideal for applications requiring noise immunity, signal isolation, or voltage level translation. The CNY65 is housed in a compact 6-pin DIP package, ensuring compatibility with standard PCB layouts and automated assembly processes.

With its robust construction and reliable performance, the CNY65 is particularly suitable for industrial environments and applications requiring intrinsic safety. The device offers excellent current transfer ratio (CTR) characteristics and maintains stable operation across a wide temperature range.

Key Features

• High isolation voltage (5000 V_rms minimum)
• Current transfer ratio (CTR) range: 20% to 320% (depending on variant)
• Gallium arsenide infrared LED with high radiant intensity
• Silicon phototransistor output with fast response time
• Compact 6-pin DIP package
• Wide operating temperature range: -55°C to +100°C
• Suitable for intrinsic safety circuits
• Compliant with international safety standards
• Lead-free and RoHS compliant versions available

Applications

The CNY65 optocoupler finds use in numerous applications requiring electrical isolation and signal transmission:

• Industrial control systems
• Power supply feedback circuits
• Medical equipment
• Telecommunication systems
• Motor control circuits
• Measurement and test equipment
• Intrinsic safety barrier applications
• PLC input/output isolation
• Ground loop elimination
• Voltage level shifting

Electrical Characteristics

Absolute Maximum Ratings

• Input diode reverse voltage: 5 V
• Input diode forward current: 60 mA (continuous)
• Collector-emitter voltage: 70 V
• Emitter-collector voltage: 7 V
• Collector current: 50 mA
• Total power dissipation: 150 mW
• Isolation voltage: 5000 V_rms
• Operating temperature range: -55°C to +100°C
• Storage temperature range: -55°C to +125°C

Optical Characteristics

• Input diode forward voltage: 1.25 V (typical at I_F = 10 mA)
• Input diode reverse current: 10 µA (max at V_R = 3 V)
• Current transfer ratio (CTR): 20% to 320% (depending on variant)
• Response time (turn-on): 3 µs (typical)
• Response time (turn-off): 4 µs (typical)
• Input-output capacitance: 0.6 pF (typical)

Package Information

The CNY65 is available in a standard 6-pin dual in-line package (DIP) with the following dimensions:

• Package type: DIP-6
• Body width: 7.62 mm
• Body length: 9.65 mm
• Body height: 3.3 mm
• Lead pitch: 2.54 mm
• Lead length: 3.3 mm (minimum)
• Material: Black thermoplastic
• Flammability rating: UL94 V-0

Pin Configuration

• Pin 1: Anode of input LED
• Pin 2: Cathode of input LED
• Pin 3: No connection
• Pin 4: Emitter of output phototransistor
• Pin 5: Collector of output phototransistor
• Pin 6: Base connection of output phototransistor (typically left unconnected)

Reliability and Safety

The CNY65 optocoupler is designed and tested to meet stringent reliability and safety requirements:

• UL recognized (File E52744)
• CSA approved
• IEC/EN/DIN EN 60747-5-2 compliant
• VDE approved (Option available)
• Isolation voltage tested per UL 1577
• Flammability rating: UL94 V-0
• Moisture sensitivity level (MSL): 1 (unlimited floor life at <30°C/85% RH)

Design Considerations

Input Circuit Design

When designing with the CNY65, the input LED should be driven with a current-limiting resistor to ensure proper operation and longevity. The recommended forward current is typically between 5 mA and 20 mA for most applications. Higher currents will increase light output and CTR but may reduce the LED lifespan.

Output Circuit Design

The phototransistor output can be used in either common-emitter or common-collector configurations. A pull-up resistor is typically required, with values ranging from 1kΩ to 10kΩ depending on the required switching speed and power consumption. For faster switching, smaller resistor values are preferred, but this increases power consumption.

PCB Layout Recommendations

• Maintain adequate creepage and clearance distances for the rated isolation voltage
• Keep input and output traces physically separated
• Use ground planes to minimize noise coupling
• Avoid routing high-speed or high-current traces near the optocoupler
• Consider using a slot or cutout under the package for additional isolation

Ordering Information

The CNY65 is available in several variants with different CTR ranges and packaging options:

• CNY65-1X: CTR 20% to 40%
• CNY65-2X: CTR 40% to 80%
• CNY65-3X: CTR 80% to 160%
• CNY65-4X: CTR 160% to 320%
• Tape and reel packaging available (suffix -T)
• Lead-free versions available (suffix -LF)