MOC8080SD Equivalent & Substitute Parts

Part Overview

The MOC8080SD is an optoisolator with Darlington output and base connection, manufactured by onsemi. It provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MOC8080SD

onsemiIn Stock: 958MOC8080SD Datasheet

Current PartRFQ

4N32SR2M

onsemiIn Stock: 222394N32SR2M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC8080SD is determined by the following critical parameters:

• Isolation Voltage: The substitute must maintain isolation voltage at or above the application requirement. The MOC8080SD provides 5300Vrms isolation.
• Output Configuration: The substitute must feature Darlington output with base connection to maintain circuit compatibility.
• Package Type: The substitute must use 6-SMD, Gull Wing surface mount packaging for PCB layout compatibility.
• Number of Channels: Single-channel configuration is required.
• Operating Temperature Range: The substitute must support the required temperature envelope.

The 4N32SR2M is identified as a substitute based on matching output type, package configuration, and channel count. However, the isolation voltage is lower (4170Vrms versus 5300Vrms), and this difference must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 4N32SR2M is an active product from onsemi and is available in high volume (22,200 pcs in stock). It shares the same package configuration and output topology as the MOC8080SD, enabling direct PCB layout compatibility.

Key differences requiring evaluation:

• Isolation Voltage: The 4N32SR2M provides 4170Vrms isolation, which is 1130Vrms lower than the MOC8080SD. Applications requiring the full 5300Vrms isolation specification cannot use this substitute.
• Current Transfer Ratio: The 4N32SR2M exhibits significantly higher current transfer ratio (500% minimum versus 50% minimum), resulting in improved switching characteristics and lower input current requirements.
• Output Voltage Rating: The 4N32SR2M maximum output voltage is 30V compared to 55V for the MOC8080SD. Output circuit designs must operate within this lower voltage envelope.
• Temperature Range: The 4N32SR2M operates from -40°C to 100°C, which is narrower than the MOC8080SD range of -55°C to 100°C. Low-temperature applications below -40°C cannot use this substitute.
• Compliance: The 4N32SR2M is ROHS3 compliant, whereas the MOC8080SD status is not specified. Both are REACH unaffected and classified as EAR99.

Frequently Asked Questions (FAQ)

Q: Can the 4N32SR2M directly replace the MOC8080SD in all applications?

A: Direct replacement is not universal. The 4N32SR2M is suitable only for applications where isolation voltage requirements do not exceed 4170Vrms, output voltage does not exceed 30V, and operating temperature remains above -40°C.

Q: What is the significance of the higher current transfer ratio in the 4N32SR2M?

A: The 4N32SR2M current transfer ratio of 500% minimum (versus 50% for the MOC8080SD) indicates superior optical coupling efficiency. This results in lower input LED current requirements and faster switching response, benefiting circuit performance.

Q: Are the packages physically identical?

A: Both devices use 6-SMD, Gull Wing surface mount packaging. PCB footprints are compatible, and no layout modifications are required for package accommodation.

Q: What compliance certifications apply to each part?

A: The MOC8080SD product status is obsolete with unspecified RoHS compliance. The 4N32SR2M is an active product with ROHS3 compliance certification. Both parts are REACH unaffected and EAR99 classified.

Q: How should isolation voltage differences be evaluated?

A: Isolation voltage selection depends on the maximum voltage differential across the optoisolator in the application circuit. If the design requires 5300Vrms isolation, the 4N32SR2M at 4170Vrms is not suitable. If the application requires less than 4170Vrms isolation, the 4N32SR2M meets the requirement.