CNY17F4

Overview

The CNY17F4 is a single-channel optocoupler from onsemi featuring an NPN phototransistor output. It provides electrical isolation with a maximum collector-emitter voltage of 70 V and a collector current of 50 mA. The device operates within a temperature range of -40°C to +100°C. Key electrical parameters include a forward voltage of 1.65 V, a minimum current transfer ratio of 160%, and a maximum of 320%. Typical switching times are 6 μs for rise and 24 μs for fall. The component is available in various packages including MDIP-6 and SMD configurations.

Feature Summary

• Provides galvanic isolation between input and output circuits using an infrared LED and NPN phototransistor pair.

Applications

• Signal isolation in industrial control systems
• Interface between microcontrollers and high-voltage loads
• Switching power supply feedback loops

Procurement Notes

Verify the specific suffix (e.g., VM, SR2M) to confirm package type and compliance status. Confirm availability as standard variants may be discontinued or subject to allocation. Check RoHS and REACH declarations against project requirements. Ensure the selected variant matches the required isolation voltage rating for the application safety standards.

Selection Notes

Select based on required isolation voltage and package style. Verify that the current transfer ratio meets the logic level requirements of the receiving circuit. Consider thermal dissipation limits if operating near maximum ratings. Ensure the switching speed is sufficient for the signal frequency. Compare alternative pin-compatible devices if lead times are critical.

Part Context

The CNY17F4 belongs to the CNY17 series of general-purpose optocouplers. This family is widely used for basic isolation tasks. Variants differ primarily by packaging and certification markings. The core electrical characteristics remain consistent across the series. Designers often choose this series for cost-sensitive applications requiring reliable DC signal isolation.

Replacement Considerations

Public sources indicate the base CNY17F4 model is obsolete. Substitutes such as LITEON CNY17F-1 are listed as similar options. Verify pinout compatibility and electrical specifications before replacement. Ensure the substitute meets the same isolation voltage and current transfer ratio requirements.