MOC8080S Equivalent & Substitute Parts

Part Overview

The MOC8080S is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The product is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component sourcing.

Substiute Parts

MOC8080S

onsemiIn Stock: 1046MOC8080S Datasheet

Current PartRFQ

4N32SM

onsemiIn Stock: 22754N32SM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MOC8080S is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms required to maintain equivalent isolation performance
• Output Configuration: Darlington with Base output type
• Package Type: 6-SMD, Gull Wing surface mount
• Number of Channels: Single channel
• Vce Saturation: Maximum 1V
• Operating Temperature Range: Must support -55°C to 100°C or equivalent operational envelope

The 4N32SM meets the core functional requirements of package type, output configuration, and channel count. However, it operates at a lower isolation voltage (4170Vrms) and reduced maximum output voltage (30V vs 55V), with a narrower temperature range (-40°C to 100°C). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 4N32SM is available as an active product from onsemi with current inventory support (2240 pcs in stock), whereas the MOC8080S is obsolete. Both components share identical package geometry and output configuration, enabling direct physical replacement in 6-SMD surface mount applications.

The 4N32SM exhibits superior current transfer ratio performance (500% vs 50% @ 10mA), which may provide improved switching characteristics in applications with marginal input drive levels. However, the reduced isolation voltage rating (4170Vrms vs 5300Vrms) and lower maximum output voltage (30V vs 55V) represent functional constraints that must be evaluated against application specifications.

The 4N32SM is RoHS3 compliant, whereas the MOC8080S compliance status is not specified. Both components carry REACH Unaffected status and EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can the 4N32SM directly replace the MOC8080S in all applications?

A: Physical replacement is possible due to identical package and pin configuration. Functional compatibility depends on application isolation voltage and output voltage requirements. Applications requiring 5300Vrms isolation or 55V output capability exceed the 4N32SM specifications.

Q: What is the significance of the current transfer ratio difference?

A: The 4N32SM provides 500% CTR compared to the MOC8080S at 50% CTR. Higher CTR indicates greater output current for a given input current, potentially improving switching speed and reducing input drive requirements.

Q: Are there temperature range implications for substitution?

A: The MOC8080S operates from -55°C to 100°C, while the 4N32SM operates from -40°C to 100°C. Applications requiring operation below -40°C cannot use the 4N32SM as a substitute.

Q: What packaging considerations apply to this substitution?

A: Both components use 6-SMD Gull Wing surface mount packages with identical footprints. No PCB layout modifications are required for physical replacement.

Q: How do the isolation voltage ratings affect component selection?

A: Isolation voltage rating determines the maximum voltage differential that can be safely applied across the optoisolator. The MOC8080S 5300Vrms rating provides higher isolation margin than the 4N32SM 4170Vrms rating. Application requirements must not exceed the selected component's isolation specification.