CNW84 Equivalent & Substitute Parts

Part Overview

The CNW84 is an optoisolator with transistor output manufactured by onsemi, designed for applications requiring galvanic isolation up to 5900Vrms. This component features a single channel configuration in a 6-DIP package with a maximum output current of 100mA per channel. The CNW84 is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

CNW84

onsemiIn Stock: 1985CNW84 Datasheet

Current PartRFQ

CNY17F-2

Lite-On Inc.In Stock: 26376CNY17F-2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNW84 is determined by the following critical parameters:

• Isolation Voltage: The CNW84 provides 5900Vrms isolation. Substitute parts must maintain isolation voltage at or above this level to ensure equivalent safety and performance margins.
• Output Configuration: Single-channel transistor output is required for functional equivalence.
• Package Type: 6-DIP through-hole mounting is the mechanical requirement for direct board-level replacement.
• Output Current Capability: Maximum output current of 100mA defines the load-driving capacity.
• Current Transfer Ratio: The operating range of 0.63% to 3.20% @ 10mA establishes the input-to-output signal transfer characteristics.

The CNY17F-2 manufactured by Lite-On Inc. qualifies as a substitute based on these parameters: it maintains single-channel transistor output configuration, operates in a compatible 6-DIP package, and provides 5000Vrms isolation voltage. While the isolation voltage is lower than the CNW84, it remains within acceptable substitution criteria for applications not requiring the full 5900Vrms specification.

Parameter Comparison

Engineering Selection Recommendations

The CNY17F-2 is the identified substitute for the obsolete CNW84. Selection of this substitute is supported by the following factors:

• Product Status: The CNY17F-2 maintains active product status with 26,300 units in stock, ensuring availability for immediate procurement and long-term supply continuity.
• Compliance: The CNY17F-2 is ROHS3 compliant, meeting current regulatory requirements for electronic components in regulated markets.
• Functional Compatibility: Both components share identical channel configuration (single channel), output type (transistor), and mounting methodology (through-hole 6-DIP).
• Performance Characteristics: The CNY17F-2 demonstrates superior current transfer ratio performance (63% to 125% @ 10mA versus 0.63% to 3.20% @ 10mA), lower saturation voltage (300mV versus 400mV), and higher output current capability (150mA versus 100mA).

The primary design consideration is the isolation voltage differential: the CNY17F-2 provides 5000Vrms compared to the CNW84's 5900Vrms. Applications requiring the full 5900Vrms isolation specification must evaluate whether the 5000Vrms rating of the CNY17F-2 meets system safety and performance requirements.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F-2 directly replace the CNW84 on existing PCBs?

A: Physical replacement is possible due to identical 6-DIP through-hole package configuration. However, the CNY17F-2 uses a 0.300" (7.62mm) DIP body compared to the CNW84's 0.400" (10.16mm) body. Verify PCB pad spacing and hole diameter compatibility before implementation.

Q: What is the significance of the isolation voltage difference between these components?

A: The CNW84 provides 5900Vrms isolation while the CNY17F-2 provides 5000Vrms. The 900Vrms difference represents a 15% reduction in isolation capability. Applications with isolation voltage requirements at or below 5000Vrms can use the CNY17F-2 without modification. Applications requiring higher isolation margins should evaluate alternative components or confirm that 5000Vrms meets system safety standards.

Q: How do the current transfer ratios compare between these parts?

A: The CNW84 operates at 0.63% to 3.20% current transfer ratio, while the CNY17F-2 operates at 63% to 125%. The CNY17F-2 exhibits significantly higher signal transfer efficiency. Circuit designs relying on the lower transfer ratio characteristics of the CNW84 require recalibration for the CNY17F-2's higher efficiency.

Q: Is the CNY17F-2 suitable for new designs?

A: Yes. The CNY17F-2 is active product status with ROHS3 compliance, making it appropriate for new design implementations. The CNW84, classified as obsolete, should not be specified for new designs.

Q: What are the output current differences?

A: The CNW84 supports 100mA maximum output current per channel, while the CNY17F-2 supports 150mA. The CNY17F-2 provides 50% greater output current capability, allowing it to drive higher-impedance loads or multiple parallel loads compared to the original component.