MOC81083SD Equivalent & Substitute Parts

Part Overview

The MOC81083SD is an optoisolator with transistor output manufactured by onsemi, featuring 5300Vrms isolation voltage and 1 channel configuration in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part delivers 250-600% current transfer ratio at 10mA with 2µs/3µs turn-on/turn-off times and operates across -55°C to 100°C temperature range.

Substiute Parts

MOC81083SD

onsemiIn Stock: 1090MOC81083SD Datasheet

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CNY17F4SR2VM

onsemiIn Stock: 2003CNY17F4SR2VM 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 eligibility for the MOC81083SD is determined by the following critical parameters:

Primary Compatibility Criteria:

• Number of Channels: 1 channel required
• Output Type: Transistor output required
• Voltage - Isolation: Minimum 5300Vrms (equal or higher)
• Current Transfer Ratio: Minimum 250% @ 10mA (equal or higher)
• Voltage - Output (Max): 70V or greater
• Current - Output / Channel: 50mA or greater
• Package / Case: 6-SMD, Gull Wing form factor
• Mounting Type: Surface Mount

Substitute Parts Identified:

Group 1 - Direct Electrical Equivalent (Same Isolation Voltage):

• MOC8108SM (Isocom Components 2004 LTD)
• MOC8108SMT&R (Isocom Components 2004 LTD)

Group 2 - Lower Isolation Voltage Alternative:

• CNY17F4SR2VM (onsemi) - 4170Vrms isolation

Parameter Comparison

Engineering Selection Recommendations

MOC8108SM and MOC8108SMT&R (Isocom Components 2004 LTD): These parts maintain identical electrical specifications to the MOC81083SD, including 5300Vrms isolation voltage, 250-600% current transfer ratio, and 70V maximum output voltage. Both are active products with ROHS3 compliance. The primary difference is packaging format: MOC8108SM is supplied in Tube, while MOC8108SMT&R is supplied in Tape & Reel. Timing characteristics show longer turn-on/turn-off and rise/fall times compared to the original part. Selection between these two depends on procurement and assembly requirements.

CNY17F4SR2VM (onsemi): This part is suitable only for applications where the 4170Vrms isolation voltage meets design requirements. It maintains the same manufacturer as the original part and is ROHS3 compliant. The current transfer ratio minimum of 160% @ 10mA is lower than the MOC81083SD specification of 250% @ 10mA. Operating temperature range is -40°C to 100°C, which is narrower than the original -55°C to 100°C range. This part is appropriate for designs with relaxed isolation voltage and current transfer ratio requirements.

Frequently Asked Questions (FAQ)

Q: Can MOC8108SM or MOC8108SMT&R be used as direct replacements for MOC81083SD?

A: Yes, both MOC8108SM and MOC8108SMT&R meet the primary electrical compatibility criteria. They maintain 5300Vrms isolation voltage, 250-600% current transfer ratio, and identical output voltage and package specifications. The difference between these two substitute parts is packaging format only: Tube versus Tape & Reel. Timing performance differs, with longer switching times in the MOC8108 series.

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

A: Both parts are electrically identical. MOC8108SM is supplied in Tube packaging, while MOC8108SMT&R is supplied in Tape & Reel (TR) format. Selection depends on assembly line requirements and procurement preferences.

Q: Is CNY17F4SR2VM a suitable substitute?

A: CNY17F4SR2VM is suitable only if your application does not require 5300Vrms isolation voltage. This part provides 4170Vrms isolation and a minimum current transfer ratio of 160% @ 10mA, both lower than the MOC81083SD. The operating temperature range is also narrower (-40°C to 100°C versus -55°C to 100°C). Use this part only when isolation voltage and current transfer ratio requirements are less stringent.

Q: What compliance certifications apply to these substitute parts?

A: MOC8108SM, MOC8108SMT&R, and CNY17F4SR2VM are all ROHS3 compliant. All parts carry REACH Unaffected status and EAR99 ECCN classification. Moisture Sensitivity Level is 1 (Unlimited) for all parts.

Q: Are there any timing performance differences between the original and substitute parts?

A: Yes. The MOC81083SD specifies 2µs turn-on and 3µs turn-off times with 1µs and 2µs rise/fall times. The MOC8108 series (both SM and SMT&R variants) specifies 7.5µs turn-on and 5.7µs turn-off times with 3.2µs and 4.7µs rise/fall times. The CNY17F4SR2VM matches the original timing specification. Applications with strict timing requirements should account for these differences.

Q: What is the current-carrying capacity difference?

A: The MOC81083SD specifies 100mA maximum DC forward current. MOC8108SM, MOC8108SMT&R, and CNY17F4SR2VM all specify 60mA maximum DC forward current. Applications requiring higher input current should account for this reduction.