CNW83SD Optoisolator Equivalent & Substitute Parts

Part Overview

The CNW83SD is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications. It features 5900Vrms isolation voltage, single-channel configuration, and 6-SMD surface mount packaging. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

CNW83SD

onsemiIn Stock: 1142CNW83SD Datasheet

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LDA100STR

IXYS Integrated Circuits DivisionIn Stock: 2565LDA100STR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNW83SD is determined by the following critical parameters:

• Package Compatibility: 6-SMD, Gull Wing surface mount configuration
• Functional Type: Optoisolator with transistor output and base connection
• Single Channel: One isolated channel requirement
• Isolation Voltage: Minimum 3750Vrms acceptable for applications not requiring the full 5900Vrms specification
• Output Characteristics: Transistor with base output, maximum output voltage and current ratings
• Input Type: DC or AC/DC input capability

The LDA100STR qualifies as a substitute based on matching package type, functional architecture, and channel configuration. While isolation voltage is lower (3750Vrms vs. 5900Vrms), it remains suitable for applications where the lower isolation rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The LDA100STR is an active product with ROHS3 compliance, providing procurement and regulatory advantages over the obsolete CNW83SD. Selection between these parts depends on isolation voltage requirements:

• CNW83SD: Required only when 5900Vrms isolation voltage is a mandatory design specification
• LDA100STR: Suitable for applications where 3750Vrms isolation meets system requirements, offering active product status and improved regulatory compliance

Both parts share identical package geometry (6-SMD, Gull Wing) and functional architecture (single-channel transistor with base output), enabling direct footprint compatibility. The LDA100STR provides superior current transfer ratio performance (33% @ 1mA vs. 0.4% @ 10mA), though with lower maximum output voltage (30V vs. 50V) and slightly higher saturation voltage (500mV vs. 400mV).

Frequently Asked Questions (FAQ)

Q: Can LDA100STR directly replace CNW83SD in existing designs?

A: Direct replacement is possible only if the application does not require 5900Vrms isolation voltage. The 3750Vrms isolation rating of the LDA100STR is lower. Both parts use identical 6-SMD, Gull Wing packaging, ensuring footprint compatibility. Verify that your circuit design specifications permit the lower isolation voltage before substitution.

Q: What are the key differences in electrical performance?

A: The LDA100STR has significantly higher current transfer ratio (33% @ 1mA) compared to CNW83SD (0.4% @ 10mA), indicating superior optical coupling efficiency. However, the LDA100STR has lower maximum output voltage (30V vs. 50V) and higher saturation voltage (500mV vs. 400mV). Evaluate these differences against your circuit requirements.

Q: Is the LDA100STR suitable for new designs?

A: Yes. The LDA100STR is an active product with ROHS3 compliance, making it appropriate for new designs. It supports both AC and DC input types, providing greater flexibility than the DC-only CNW83SD.

Q: Are there any package or mounting considerations?

A: Both parts use 6-SMD, Gull Wing surface mount packaging. The LDA100STR is supplied in Tape & Reel format. No additional mounting or assembly modifications are required for substitution.

Q: What is the impact of lower isolation voltage?

A: The LDA100STR provides 3750Vrms isolation versus 5900Vrms for the CNW83SD. Applications requiring the higher isolation rating cannot use the LDA100STR. Confirm your system's isolation voltage requirement before selecting a substitute part.