CNY173

Transistor, Photovoltaic Output Optoisolators Overview

The onsemi CNY173SR2M is a single-channel transistor-output optocoupler housed in a 6-SMD gull-wing package. It provides an isolation voltage of 4170Vrms and supports a maximum collector-emitter voltage of 70V with a continuous output current of 50mA. The device features a typical forward voltage of 1.35V, a maximum DC forward current of 60mA, and a saturation voltage of 400mV. Current transfer ratios range from 100% to 200% at 10mA input. Switching characteristics include typical turn-on/turn-off times of 2µs and 3µs, respectively, and rise/fall times of 4µs and 3.5µs. It operates within a temperature range of -40°C to 100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides high-voltage electrical isolation between input and output circuits using a phototransistor configuration.
• Includes a dedicated base pin on the output transistor to facilitate faster switching speeds and improved load handling capabilities.
• Delivers consistent signal transmission performance across a wide industrial operating temperature range.

Transistor, Photovoltaic Output Optoisolators Applications

• Industrial automation control systems requiring galvanic isolation
• Microcontroller interface circuits for digital signal transmission
• Power supply feedback loops for voltage regulation monitoring

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix (e.g., SR2M) against the design bill of materials to ensure correct packaging format such as tape and reel or cut tape. Confirm that the 6-SMD gull-wing footprint matches the PCB layout requirements. Check for RoHS compliance status if environmental regulations apply to the final assembly. Ensure the selected variant meets the required isolation voltage ratings for the specific safety standards of the end application.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a surface-mount solution with a base-driven phototransistor is required for enhanced switching performance compared to standard emitter-only outputs. Consider the 4170Vrms isolation rating for applications demanding robust barrier protection. Evaluate the 6-SMD package dimensions against available board space constraints. Compare the current transfer ratio specifications against the driving circuit capabilities to ensure reliable logic level translation under varying temperature conditions.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the CNY17 series of general-purpose optocouplers manufactured by onsemi. The series offers various package options including through-hole DIP and surface-mount configurations. The CNY173 variant specifically denotes the model with a base connection on the phototransistor, distinguishing it from variants like the CNY171 or CNY172 which lack this feature. This family is widely used in cost-sensitive isolation applications.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct substitutes include other CNY173 variants with different packaging suffixes such as CNY173SM or CNY173VM, provided the package type matches the assembly process. Verify pinout compatibility before replacing through-hole versions with surface-mount equivalents in retrofit designs.

Transistor, Photovoltaic Output Optoisolators FAQ

What is the function of the base pin on the CNY173 phototransistor?

The base pin allows for external biasing or pulling down the base terminal, which significantly reduces storage time and improves the switching speed of the output transistor compared to devices without a base connection.

Does the CNY173 support AC input signals?

No, the CNY173 is designed for DC input signals. The internal LED requires direct current to generate the light intensity necessary to activate the phototransistor.