CNW84SD Equivalent & Substitute Parts

Part Overview

The CNW84SD is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications. It features a single channel with 5900Vrms isolation voltage and is packaged in a 6-SMD, Gull Wing surface mount configuration. The device is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

CNW84SD

onsemiIn Stock: 1031CNW84SD Datasheet

Current PartRFQ

CNY17F-2S

Lite-On Inc.In Stock: 1796CNY17F-2S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNW84SD is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms required to maintain electrical isolation specifications
• Output Configuration: Transistor output type with single channel
• Package Type: 6-SMD, Gull Wing surface mount for PCB compatibility
• Current Transfer Ratio Range: Operating range between 0.63% and 3.20% at 10mA input
• Output Voltage Rating: Maximum output voltage capability of 70V or higher
• Output Current Capacity: Minimum 100mA per channel
• Saturation Voltage: Maximum Vce saturation of 400mV or lower for switching performance

The CNY17F-2S meets these substitution criteria as an active product with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The CNY17F-2S is a suitable substitute for the obsolete CNW84SD based on the following factors:

Product Status: The CNY17F-2S is an active product with current manufacturing support, whereas the CNW84SD is obsolete. This ensures long-term availability and supply chain continuity.

Compliance: The CNY17F-2S is ROHS3 compliant, meeting modern regulatory requirements. The CNW84SD is RoHS non-compliant, which may present procurement and environmental compliance challenges.

Electrical Compatibility: The CNY17F-2S meets the minimum isolation voltage requirement at 5000Vrms, though 900Vrms lower than the original specification. The substitute provides superior current transfer ratio performance, lower saturation voltage, and higher output current capacity, all of which support reliable operation in the intended application.

Package Compatibility: Both devices use identical 6-SMD, Gull Wing surface mount packaging, enabling direct PCB layout compatibility without redesign.

Design Consideration: Applications requiring the full 5900Vrms isolation specification of the CNW84SD should evaluate whether the 5000Vrms rating of the CNY17F-2S is acceptable for the specific isolation barrier requirements.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F-2S directly replace the CNW84SD on existing PCBs?

A: Yes. Both devices use identical 6-SMD, Gull Wing packaging with the same pinout configuration, allowing direct substitution without PCB modifications.

Q: What is the isolation voltage difference, and does it matter?

A: The CNW84SD provides 5900Vrms isolation while the CNY17F-2S provides 5000Vrms. The 900Vrms difference should be evaluated against your application's isolation barrier requirements. If your design margin accommodates 5000Vrms isolation, the substitute is suitable.

Q: Why is the current transfer ratio so different between these parts?

A: The CNW84SD has a current transfer ratio of 0.63–3.20% at 10mA, while the CNY17F-2S has 63–125% at the same input current. This indicates fundamentally different device characteristics. The CNY17F-2S will require different input drive circuit design to achieve equivalent output performance.

Q: Is the lower maximum output voltage of the CNY17F-2S a concern?

A: The CNY17F-2S is rated for 70V maximum output versus 80V for the CNW84SD. If your application operates below 70V, this is not a limitation. Applications requiring output voltages above 70V require alternative substitutes.

Q: What are the compliance advantages of the CNY17F-2S?

A: The CNY17F-2S is ROHS3 compliant and actively manufactured, whereas the CNW84SD is RoHS non-compliant and obsolete. This provides regulatory compliance, supply chain availability, and long-term support advantages.

Q: Are there any thermal or operating temperature considerations?

A: The CNY17F-2S specifies an operating temperature range of -55°C to 100°C. The CNW84SD does not provide this specification in available documentation. Verify that the CNY17F-2S temperature range meets your application requirements.