CNW83 Equivalent & Substitute Parts

Part Overview

The CNW83 is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 5900Vrms isolation rating. This component features a single channel configuration in a 6-DIP through-hole package with 100mA output current capability and 400mV maximum saturation voltage.

The CNW83 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this isolation level and package type are required.

Substiute Parts

CNW83

onsemiIn Stock: 4461CNW83 Datasheet

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CNY171M

onsemiIn Stock: 20430CNY171M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNW83 optoisolator is determined by the following critical parameters:

• Isolation Voltage: The CNW83 requires 5900Vrms isolation capability. Substitute parts must maintain or exceed this isolation rating to preserve circuit safety margins and regulatory compliance.
• Output Configuration: The transistor with base output type is mandatory for circuits designed around this control architecture.
• Single Channel: The application requires single-channel isolation, not multi-channel variants.
• Package Type: The 6-DIP through-hole package is required for mechanical and electrical compatibility with existing PCB layouts.
• Output Current: The 100mA output current capability defines the maximum load-driving capacity.
• DC Input Type: The optoisolator must accept DC input signals.

The CNY171M is identified as a substitute part. However, the CNY171M operates at 4170Vrms isolation voltage, which is lower than the CNW83's 5900Vrms specification. This represents a reduction in isolation capability and may not be suitable for applications requiring the full 5900Vrms isolation margin.

Parameter Comparison

Engineering Selection Recommendations

The CNY171M is an active product from onsemi with ROHS3 compliance, addressing the obsolescence of the CNW83. However, the following technical constraints apply:

Isolation Voltage Reduction: The CNY171M operates at 4170Vrms compared to the CNW83's 5900Vrms. This 29% reduction in isolation voltage may be acceptable only in applications where the circuit design margin permits operation below the original specification. Applications requiring the full 5900Vrms isolation rating cannot use the CNY171M as a direct substitute.

Output Current Limitation: The CNY171M provides 50mA maximum output current versus the CNW83's 100mA. Circuits designed to draw 100mA from the optoisolator output cannot be directly supplied by the CNY171M without redesign.

Package Dimension Variance: The CNY171M uses a 6-DIP (0.300", 7.62mm) body compared to the CNW83's 6-DIP (0.400", 10.16mm). While both are 6-DIP packages, the different body lengths may affect PCB layout compatibility, particularly in densely populated boards or where mechanical clearance is constrained.

Regulatory Compliance: The CNY171M meets ROHS3 compliance, whereas the CNW83 is RoHS non-compliant. For new designs or applications subject to RoHS regulations, the CNY171M provides compliance alignment.

Selection of the CNY171M requires verification that the application can tolerate reduced isolation voltage, lower output current, and potential PCB layout adjustments for the different package dimensions.

Frequently Asked Questions (FAQ)

Q: Can the CNY171M directly replace the CNW83 in existing designs?

A: Direct replacement is not recommended without circuit analysis. The CNY171M has lower isolation voltage (4170Vrms vs. 5900Vrms), reduced output current (50mA vs. 100mA), and different package dimensions (0.300" vs. 0.400" DIP body length). Applications must verify that these parameter reductions are acceptable for their specific isolation and current requirements.

Q: What is the primary reason the CNW83 is obsolete?

A: The CNW83 is classified as obsolete by onsemi. The CNY171M represents the active product line continuation for single-channel optoisolators with transistor base output in the 6-DIP package from this manufacturer.

Q: Are there isolation voltage concerns when substituting the CNY171M?

A: Yes. The CNY171M's 4170Vrms isolation is 29% lower than the CNW83's 5900Vrms specification. Applications designed around the higher isolation rating must confirm that the reduced isolation voltage does not compromise safety margins, regulatory compliance, or circuit performance in high-voltage environments.

Q: How does the output current difference affect circuit design?

A: The CNW83 supports 100mA output current while the CNY171M supports only 50mA. Circuits that require driving loads exceeding 50mA cannot use the CNY171M without additional output buffering or redesign of the load circuit.

Q: Will the CNY171M fit the same PCB footprint as the CNW83?

A: Both parts use 6-DIP packages, but with different body lengths: CNW83 is 0.400" (10.16mm) and CNY171M is 0.300" (7.62mm). While pin spacing is compatible, the different body dimensions may affect PCB layout, particularly in space-constrained designs. Physical verification of the PCB layout is necessary before substitution.

Q: Does the CNY171M meet current regulatory standards?

A: Yes. The CNY171M is ROHS3 compliant, whereas the CNW83 is RoHS non-compliant. For applications subject to RoHS regulations or new product designs, the CNY171M provides regulatory alignment.

Q: What is the Current Transfer Ratio difference between these parts?

A: The CNW83 has a minimum Current Transfer Ratio of 0.4% @ 10mA, while the CNY171M has a minimum of 40% @ 10mA. The CNY171M's significantly higher CTR indicates improved optical coupling efficiency and faster response characteristics, which may affect circuit timing and control behavior.