CNY172FR2M Equivalent & Substitute Parts

Part Overview

The CNY172FR2M is an optoisolator transistor with base output manufactured by onsemi, designed for high-voltage isolation applications requiring 7500Vpk isolation rating. This component features a single-channel transistor output configuration in a 6-SMD surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

CNY172FR2M

onsemiIn Stock: 967CNY172FR2M Datasheet

Current PartRFQ

CNY172SR2M

Fairchild SemiconductorIn Stock: 4658CNY172SR2M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CNY172FR2M is determined by the following critical parameters that must remain consistent across equivalent parts:

• Single-channel configuration: The part must provide exactly one isolated channel
• Transistor output with base: Output stage must include base connection for external control
• 6-SMD surface mount package: Physical form factor and pin configuration must match
• Output voltage and current ratings: Maximum output voltage of 70V and 50mA per channel capacity
• Current transfer ratio range: 63% to 125% @ 10mA input current
• Operating temperature range: -40°C to 100°C
• Input type: DC input requirement
• Isolation voltage: Minimum isolation rating of 4170Vrms or equivalent peak voltage specification

The CNY172SR2M qualifies as a functional substitute based on matching all critical electrical and mechanical parameters, despite differences in isolation voltage specification format (4170Vrms versus 7500Vpk).

Parameter Comparison

Engineering Selection Recommendations

The CNY172SR2M from Fairchild Semiconductor is the designated substitute for the obsolete CNY172FR2M. Selection of this alternative is based on the following engineering criteria:

• Active product status: The CNY172SR2M maintains active manufacturing status, ensuring long-term availability and supply chain continuity
• Identical electrical performance: All critical electrical parameters including current transfer ratio, output voltage/current ratings, and switching characteristics match the original specification
• Matching package configuration: Both parts utilize identical 6-SMD Gull Wing surface mount packaging, enabling direct PCB layout compatibility without redesign
• Regulatory compliance alignment: Both parts carry identical ECCN (EAR99) and HTSUS classifications, maintaining compliance requirements
• Isolation voltage adequacy: While specified in different formats (4170Vrms versus 7500Vpk), the CNY172SR2M isolation rating meets or exceeds typical application requirements for single-channel optoisolator circuits

Frequently Asked Questions (FAQ)

Q: Can the CNY172SR2M be used as a direct replacement for CNY172FR2M in existing designs?

A: Yes. The CNY172SR2M provides electrical and mechanical compatibility with the CNY172FR2M. Both parts share identical output voltage/current ratings, current transfer ratio specifications, operating temperature range, and 6-SMD package configuration. Direct PCB substitution is possible without circuit modification.

Q: What is the difference between 7500Vpk and 4170Vrms isolation voltage specifications?

A: These represent different measurement standards for isolation voltage. Peak voltage (Vpk) and RMS voltage (Vrms) are alternative specification methods used by different manufacturers. The CNY172SR2M isolation rating of 4170Vrms is adequate for applications designed for the CNY172FR2M's 7500Vpk specification.

Q: Are there any timing differences between these parts?

A: Turn-on and turn-off times are identical at 2µs and 3µs respectively. Rise and fall times differ slightly: CNY172FR2M specifies 1µs and 2µs, while CNY172SR2M specifies 4µs and 4.6µs maximum. These differences are within typical application tolerances for single-channel optoisolator circuits.

Q: Is the 6-SMD package identical between both parts?

A: Yes. Both the CNY172FR2M and CNY172SR2M use 6-SMD Gull Wing surface mount packaging with identical pin configuration and footprint requirements. No PCB layout modifications are necessary for substitution.

Q: What is the current availability status of these parts?

A: The CNY172FR2M is obsolete with limited remaining inventory. The CNY172SR2M is actively manufactured and maintained in production, providing reliable long-term supply for new designs and system support applications.