MOC8080 Equivalent & Substitute Parts

Part Overview

The MOC8080 is an optoisolator with Darlington output and base connection, rated for 5300Vrms isolation voltage in a 6-DIP through-hole package. Manufactured by onsemi, this component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The MOC8080 provides galvanic isolation for low-speed switching applications requiring high voltage isolation and Darlington output configuration.

Substiute Parts

MOC8080

onsemiIn Stock: 1116MOC8080 Datasheet

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4N32M

onsemiIn Stock: 224684N32M Datasheet

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4N32

Vishay Semiconductor Opto DivisionIn Stock: 1526684N32 Datasheet

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LTV-715F

Lite-On Inc.In Stock: 910LTV-715F Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC8080 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms or equivalent
• Output Configuration: Darlington with Base connection
• Package: 6-DIP (0.300", 7.62mm) through-hole
• Number of Channels: Single channel
• Input Type: DC
• Operating Temperature Range: Must support -55°C minimum
• Vce Saturation: Maximum 1V

The substitute parts listed below maintain compatibility with these core electrical and mechanical specifications. Variations in Current Transfer Ratio, output voltage rating, and current capacity are acceptable within the bounds of the application requirements, provided the isolation voltage and package form factor remain consistent.

Parameter Comparison

Engineering Selection Recommendations

4N32 (Vishay Semiconductor Opto Division) provides the closest electrical match to the MOC8080, maintaining 5300Vrms isolation voltage and -55°C minimum operating temperature. However, this part is also classified as obsolete. Inventory availability is substantial at 152,644 pieces.

4N32M (onsemi) is the recommended primary substitute for new designs. It is actively manufactured, ROHS3 compliant, and maintains the same 6-DIP package and Darlington with Base output configuration. The isolation voltage is reduced to 4170Vrms, which may be acceptable depending on application requirements. Operating temperature minimum is -40°C, which represents a constraint for applications requiring -55°C operation.

LTV-715F (Lite-On Inc.) is an active product offering 5000Vrms isolation and ROHS3 compliance. This part lacks the base connection on the Darlington output, which may affect circuit compatibility in applications requiring base drive control. Operating temperature minimum is -25°C.

For applications requiring obsolete part replacement with active inventory and compliance certifications, 4N32M is the preferred selection. For applications requiring exact isolation voltage matching (5300Vrms) and extended low-temperature operation (-55°C), 4N32 (Vishay) remains available despite obsolete status.

Frequently Asked Questions (FAQ)

Q: Can 4N32M replace MOC8080 directly? A: 4N32M is pin-compatible and maintains the same 6-DIP package and Darlington with Base output. The primary difference is reduced isolation voltage (4170Vrms vs. 5300Vrms) and minimum operating temperature of -40°C instead of -55°C. Substitution is valid if the application does not require 5300Vrms isolation or operation below -40°C.

Q: What is the significance of the base connection on Darlington output? A: The base connection allows external control of the Darlington transistor saturation and switching characteristics. LTV-715F lacks this base connection, making it unsuitable for applications requiring base drive control.

Q: Why is isolation voltage important for substitution? A: Isolation voltage determines the maximum voltage differential that can be safely applied across the optoisolator without breakdown. Applications designed for 5300Vrms isolation cannot be downrated to 4170Vrms without circuit redesign and safety analysis.

Q: Are all substitute parts RoHS compliant? A: 4N32M and LTV-715F are ROHS3 compliant. 4N32 (Vishay) is also ROHS3 compliant. The original MOC8080 compliance status is not specified in available data.

Q: What is the difference between Current Transfer Ratio specifications? A: Current Transfer Ratio indicates the ratio of output current to input current. Higher ratios (500-600%) indicate greater sensitivity and faster switching response compared to the MOC8080 (50%). This difference affects circuit design but does not prevent substitution if output current requirements are met.

Q: Can these parts be used interchangeably in existing PCB designs? A: All substitute parts use the same 6-DIP (0.300", 7.62mm) through-hole package and pin configuration, allowing direct PCB footprint compatibility. Electrical performance differences require circuit validation before production implementation.