MOC8108SD Equivalent & Substitute Parts

Part Overview

The MOC8108SD 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, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility across isolation voltage, channel configuration, output type, and thermal operating range.

Substiute Parts

MOC8108SD

onsemiIn Stock: 5122MOC8108SD Datasheet

Current PartRFQ

CNY17F4SR2M

onsemiIn Stock: 6133CNY17F4SR2M 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 MOC8108SD is determined by the following critical parameters:

Primary Compatibility Criteria:

• Single channel configuration (Number of Channels = 1)
• Transistor output type
• 6-SMD surface mount package with gull wing leads
• Isolation voltage rating of 5300Vrms or higher
• Maximum output voltage of 70V or greater
• Output current capability of 50mA or greater
• Operating temperature range encompassing -55°C to 100°C

Secondary Compatibility Criteria:

• Current transfer ratio performance within acceptable operational margins
• Input type: DC
• Vce saturation maximum of 400mV or lower
• Moisture sensitivity level MSL 1

The substitute parts identified maintain these critical parameters while accommodating variations in switching speed characteristics and forward voltage specifications that do not impact functional substitution in typical applications.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 Substitutes (Direct Equivalents): MOC8108SM and MOC8108SMT&R are functionally equivalent to MOC8108SD. Both parts maintain identical isolation voltage (5300Vrms), current transfer ratio specifications, output voltage and current ratings, and operating temperature range. Both are manufactured by Isocom Components 2004 LTD and carry active product status with RoHS3 compliance certification. The primary distinction is packaging format: MOC8108SM is supplied in tube packaging, while MOC8108SMT&R is supplied in tape and reel format. Selection between these two should be based on procurement and assembly process requirements.

Tier 2 Substitute (Reduced Isolation Voltage): CNY17F4SR2M is manufactured by onsemi and maintains active product status with RoHS3 compliance. This part is suitable for applications where isolation voltage requirements are 4170Vrms or lower. The reduced isolation voltage rating and lower current transfer ratio specifications (160-320% versus 250-600%) represent functional limitations compared to the MOC8108SD. CNY17F4SR2M operates within a narrower temperature range (-40°C to 100°C) and exhibits higher forward voltage (1.35V versus 1.15V). This substitute is appropriate only when isolation voltage requirements do not exceed 4170Vrms and when the reduced current transfer ratio performance is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can MOC8108SM or MOC8108SMT&R be used as direct replacements for MOC8108SD?

A: Yes. Both parts are functionally equivalent across all critical parameters including isolation voltage, current transfer ratio, output specifications, and operating temperature range. The difference is packaging format only. MOC8108SM uses tube packaging suitable for manual assembly or lower-volume pick-and-place operations. MOC8108SMT&R uses tape and reel format optimized for automated assembly lines.

Q: Is CNY17F4SR2M a suitable substitute for MOC8108SD?

A: CNY17F4SR2M is suitable only for applications where isolation voltage requirements do not exceed 4170Vrms. The reduced isolation voltage rating (4170Vrms versus 5300Vrms) and lower current transfer ratio range (160-320% versus 250-600%) represent functional limitations. Applications requiring the full 5300Vrms isolation specification must use MOC8108SM or MOC8108SMT&R.

Q: What are the packaging differences between substitute parts?

A: MOC8108SD and MOC8108SM are supplied in tube packaging. MOC8108SMT&R is supplied in tape and reel format. CNY17F4SR2M is supplied in tape and reel format. All four parts use identical 6-SMD gull wing package geometry and are compatible with standard surface mount assembly equipment.

Q: Are all substitute parts RoHS compliant?

A: MOC8108SM and MOC8108SMT&R carry RoHS3 compliance certification. CNY17F4SR2M carries RoHS3 compliance certification. MOC8108SD does not specify RoHS status. All parts are REACH unaffected and classified as EAR99 for export control purposes.

Q: What is the operating temperature consideration for CNY17F4SR2M?

A: CNY17F4SR2M operates within -40°C to 100°C, which is narrower than the MOC8108SD range of -55°C to 100°C. Applications requiring operation below -40°C must use MOC8108SM or MOC8108SMT&R.