MOC81083S Equivalent & Substitute Parts

Part Overview

The MOC81083S is a single-channel optoisolator with transistor output manufactured by onsemi, rated for 5300Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MOC81083S operates with a current transfer ratio between 250% and 600% at 10mA input, suitable for applications requiring galvanic isolation in low-speed switching circuits.

Substiute Parts

MOC81083S

onsemiIn Stock: 1017MOC81083S Datasheet

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CNY17F4SVM

Fairchild SemiconductorIn Stock: 2818CNY17F4SVM Datasheet

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MOC8108SM

Isocom Components 2004 LTDIn Stock: 1172MOC8108SM Datasheet

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MOC8108SMT&R

Isocom Components 2004 LTDIn Stock: 785MOC8108SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC81083S is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms required for direct substitution
• Output Type: Transistor output configuration
• Number of Channels: Single channel
• Package / Case: 6-SMD, Gull Wing surface mount
• Current Transfer Ratio: Range between 250% and 600% @ 10mA
• Maximum Output Voltage: 70V
• Maximum Output Current: 50mA per channel

The substitute parts are grouped into two categories based on isolation voltage compatibility:

Category A - Full Electrical Equivalents (5300Vrms): MOC8108SM and MOC8108SMT&R maintain identical isolation voltage and current transfer ratio specifications, ensuring direct functional replacement.

Category B - Reduced Isolation Voltage (4170Vrms): CNY17F4SVM operates at lower isolation voltage but maintains compatible output characteristics and package configuration. This part is suitable only for applications where 4170Vrms isolation meets design requirements.

Parameter Comparison

Engineering Selection Recommendations

MOC8108SM and MOC8108SMT&R are the primary substitutes for MOC81083S. Both parts are manufactured by Isocom Components 2004 LTD and maintain active product status. These parts provide identical isolation voltage (5300Vrms) and current transfer ratio specifications (250% to 600% @ 10mA). Both are ROHS3 compliant and REACH unaffected. The selection between MOC8108SM (Tube packaging) and MOC8108SMT&R (Tape & Reel packaging) depends on procurement and assembly requirements. Note that turn-on/turn-off times are longer (7.5µs, 5.7µs) compared to the original MOC81083S (2µs, 3µs), which may affect high-speed switching applications.

CNY17F4SVM manufactured by Fairchild Semiconductor is an alternative substitute with active product status. This part operates at reduced isolation voltage (4170Vrms) and lower current transfer ratio range (160% to 320% @ 10mA). CNY17F4SVM is suitable only for applications where the lower isolation voltage specification meets design requirements. Operating temperature range is limited to -40°C ~ 100°C compared to -55°C ~ 100°C for the MOC8108 series.

Frequently Asked Questions (FAQ)

Q: Can MOC8108SM directly replace MOC81083S in all applications?

A: MOC8108SM maintains identical isolation voltage and current transfer ratio specifications. However, switching speed differs: MOC8108SM has turn-on/turn-off times of 7.5µs and 5.7µs compared to MOC81083S at 2µs and 3µs. Applications requiring fast switching response should evaluate timing requirements against MOC8108SM specifications.

Q: What is the difference between MOC8108SM and MOC8108SMT&R?

A: Both parts are electrically identical. The difference is packaging: MOC8108SM is supplied in Tube packaging, while MOC8108SMT&R is supplied in Tape & Reel format. Selection depends on assembly process requirements and procurement volume.

Q: Is CNY17F4SVM a suitable replacement for MOC81083S?

A: CNY17F4SVM is compatible in package configuration and output type but operates at 4170Vrms isolation voltage compared to MOC81083S at 5300Vrms. This part is suitable only if your application design requirements specify 4170Vrms or lower isolation voltage. Current transfer ratio is also lower (160% to 320% @ 10mA versus 250% to 600% @ 10mA).

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by isolation voltage, output type (transistor), number of channels (single), package configuration (6-SMD Gull Wing), and output voltage/current ratings (70V maximum, 50mA per channel). Current transfer ratio range and operating temperature must also be evaluated against application requirements.

Q: Are all substitute parts RoHS compliant?

A: MOC8108SM and MOC8108SMT&R are ROHS3 compliant. RoHS status for CNY17F4SVM is not specified in available documentation.

Q: What is the operating temperature range for each substitute?

A: MOC81083S, MOC8108SM, and MOC8108SMT&R operate from -55°C to 100°C. CNY17F4SVM operates from -40°C to 100°C, which may limit use in extended low-temperature applications.