CNY17 Series Optocoupler Technical Summary

Overview

The CNY17 Series is a high-performance optocoupler family consisting of a phototransistor optically coupled to a gallium arsenide (GaAs) infrared emitting diode. This component is designed to provide reliable electrical isolation while transmitting signals between two electrically isolated circuits. The series features robust isolation characteristics compliant with multiple international safety standards, making it suitable for demanding industrial and commercial applications.

The optocoupler's construction provides excellent noise immunity and signal integrity in environments with high electromagnetic interference. The special design results in exceptionally low coupling capacitance (typically 0.3 pF), which minimizes unwanted signal coupling and improves performance in high-frequency applications.

Key Features

• High isolation voltage capability (600 VRMS continuous)
• Rated impulse voltage (transient overvoltage) VIOTM = 6 kV peak
• Isolation test voltage (partial discharge test voltage) Vpd = 1.6 kV
• Rated recurring peak voltage (repetitive) VIORM = 600 VRMS
• Current Transfer Ratio (CTR) offered in 3 selectable groups
• Low coupling capacitance (typical 0.3 pF)
• Isolation materials rated UL 94-V0 (flame retardant)
• Creeping current resistance: Comparative Tracking Index CTI = 275
• Minimum thickness through insulation ≥ 0.75 mm
• Pollution degree 2 compliant (DIN/VDE 0110 part 1, IEC 664)
• Climatic classification: 55/100/21 (IEC 68 part 1)

Safety Approvals and Compliance

The CNY17 Series meets numerous international safety standards, including:

• VDE 0884 (Insulation coordination standards)
• BS 415 (British safety standards)
• BS 7002 (British component standards)
• SETI: IEC 950 (Safety of information technology equipment)
• UL 1577 (File No: E 76222) (Optical isolator standards)
• VDE 0303/IEC 112 (Tracking resistance standards)

Applications

The CNY17 optocoupler series is suitable for a wide range of applications requiring signal isolation, including:

Industrial Control Systems

• PLC input/output isolation
• Motor control circuits
• Industrial automation interfaces
• Noise suppression in control systems

Power Electronics

• Switch mode power supply feedback circuits
• Inverter control circuits
• Power monitoring systems

Telecommunications

• Line interface circuits
• Modem isolation
• Telecom equipment protection

Medical Equipment

• Patient monitoring systems
• Medical device isolation
• Equipment requiring reinforced insulation

Consumer Electronics

• Appliance control circuits
• Audio equipment isolation
• Home automation systems

Electrical Characteristics

Absolute Maximum Ratings

• Reverse Voltage (LED): 5 V
• Forward Current (LED): 60 mA (continuous)
• Collector-Emitter Voltage (Phototransistor): 70 V
• Emitter-Collector Voltage: 7 V
• Collector Current: 50 mA
• Total Power Dissipation: 150 mW
• Operating Temperature Range: -55°C to +100°C
• Storage Temperature Range: -55°C to +125°C

Optical Characteristics

• LED Forward Voltage (Typical): 1.2 V at 10 mA
• LED Reverse Current (Maximum): 10 μA at VR = 5 V
• LED Power Dissipation: 100 mW
• Phototransistor Collector Dark Current: 50 nA at VCE = 10 V
• Collector-Emitter Saturation Voltage: 0.4 V at IC = 2 mA, IF = 10 mA

Switching Characteristics

• Rise Time (Typical): 3 μs
• Fall Time (Typical): 4 μs
• Turn-on Time (Typical): 6 μs
• Turn-off Time (Typical): 5 μs

Package Information

The CNY17 Series is available in a standard 6-pin DIP (Dual In-line Package) configuration with the following mechanical characteristics:

• Package Type: Plastic DIP-6
• Lead Material: Copper alloy
• Lead Finish: Tin-plated
• Body Material: UL 94 V-0 rated plastic
• Pin Spacing: 2.54 mm (standard DIP spacing)
• Row Spacing: 7.62 mm
• Package Height: 5.08 mm maximum
• Package Width: 9.65 mm maximum
• Package Length: 10.16 mm maximum
• Lead Length: 3.3 mm minimum
• Lead Diameter: 0.46 mm typical

Pin Configuration

• Pin 1: Anode of Infrared Emitting Diode
• Pin 2: Cathode of Infrared Emitting Diode
• Pin 3: No Connection
• Pin 4: Emitter of Phototransistor
• Pin 5: Collector of Phototransistor
• Pin 6: Base of Phototransistor (typically left unconnected)

Reliability and Environmental Specifications

• Moisture Sensitivity Level (MSL): MSL 1 (Unlimited floor life at ≤30°C/85% RH)
• ESD Sensitivity: HBM Class 1B (500V to 1kV)
• Flammability Rating: UL 94 V-0
• RoHS Compliance: Compliant with Directive 2011/65/EU
• Halogen Free: Yes

Design Considerations

When implementing the CNY17 in circuit designs, consider the following:

LED Drive Circuit

• Use current limiting resistor to maintain LED current within specified limits
• Typical forward current of 10-20 mA provides optimal performance
• Pulsed operation can extend LED lifetime

Output Circuit

• Load resistor should be selected based on desired output current and speed
• Smaller resistor values increase speed but reduce CTR
• For analog applications, consider temperature compensation

PCB Layout

• Maintain proper creepage and clearance distances for high voltage isolation
• Keep input and output traces physically separated
• Use ground planes judiciously to minimize noise coupling

Quality and Reliability Testing

The CNY17 undergoes rigorous quality testing including:

• 100% electrical testing at production
• Isolation voltage testing per safety standards
• Environmental stress testing (temperature cycling, humidity)
• Mechanical stress testing (vibration, shock)
• Long-term reliability testing