MOC8104SD Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC8104SD is a 6-SMD surface mount optoisolator with transistor output manufactured by onsemi. It provides 5300Vrms isolation voltage and is designed for single-channel DC input applications with 50mA output current capability. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MOC8104SD

onsemiIn Stock: 12803MOC8104SD Datasheet

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CNY17F4SR2M

onsemiIn Stock: 6133CNY17F4SR2M Datasheet

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MOC8101-X017T

Vishay Semiconductor Opto DivisionIn Stock: 2398MOC8101-X017T Datasheet

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MOC8102-X017

Vishay Semiconductor Opto DivisionIn Stock: 4481MOC8102-X017 Datasheet

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MOC8104SM

Isocom Components 2004 LTDIn Stock: 1153MOC8104SM Datasheet

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MOC8104SMT&R

Isocom Components 2004 LTDIn Stock: 871MOC8104SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC8104SD is determined by the following critical parameters:

• Isolation Voltage: 5300Vrms minimum required
• Output Type: Transistor output configuration
• Number of Channels: Single channel
• Package: 6-SMD, Gull Wing surface mount
• Output Current: 50mA per channel
• Maximum Output Voltage: 30V
• Vce Saturation: 400mV maximum
• Operating Temperature: -55°C to 100°C range
• Input Type: DC

Substitute parts are grouped based on matching these electrical and mechanical specifications. Parts that maintain the same isolation voltage, output configuration, and thermal operating range are considered direct substitutes. Parts with lower isolation voltage or different output voltage ratings are listed as alternatives with noted parameter differences.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Matching 5300Vrms Isolation):

MOC8101-X017T and MOC8102-X017 from Vishay Semiconductor Opto Division maintain the same 5300Vrms isolation voltage, 30V maximum output voltage, and -55°C to 100°C operating temperature range as the MOC8104SD. Both are active products with ROHS3 compliance. MOC8101-X017T is supplied in Tape & Reel format, while MOC8102-X017 is supplied in Tube format. Current transfer ratio specifications differ from the original part, with lower minimum and maximum values.

Alternative Substitute (Lower Isolation Voltage):

CNY17F4SR2M from onsemi provides 4170Vrms isolation voltage, which is lower than the MOC8104SD specification. This part is suitable only for applications where the reduced isolation voltage is acceptable. It offers higher maximum current transfer ratio (320% @ 10mA) and higher maximum output voltage (70V). Operating temperature range is -40°C to 100°C, which is narrower at the low end. This part is ROHS3 compliant and supplied in Tape & Reel format.

Isocom Variants (Different Isolation Specification):

MOC8104SM and MOC8104SMT&R from Isocom Components 2004 LTD are listed with 7.5Vpk isolation voltage specification, which differs significantly from the 5300Vrms rating of the original part. These parts share the same base series designation (MOC8104) and identical mechanical packaging. Both are active products with ROHS3 compliance. MOC8104SM is supplied in Tube format, while MOC8104SMT&R is supplied in Tape & Reel format.

Compliance Status:

All active substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original MOC8104SD.

Frequently Asked Questions (FAQ)

Q: Can MOC8101-X017T or MOC8102-X017 be used as direct replacements for MOC8104SD?

A: Both parts maintain the critical 5300Vrms isolation voltage, 30V maximum output voltage, and -55°C to 100°C operating temperature range. They are mechanically compatible with the same 6-SMD, Gull Wing package. However, current transfer ratio specifications differ. MOC8101-X017T has 50–80% CTR while MOC8102-X017 has 73–117% CTR, compared to the original 160–256% CTR. Circuit design must account for these differences in gain characteristics.

Q: Why is CNY17F4SR2M listed as an alternative rather than a direct substitute?

A: CNY17F4SR2M provides only 4170Vrms isolation voltage compared to the MOC8104SD's 5300Vrms specification. This 1130Vrms reduction may not be acceptable in applications requiring the full isolation rating. The part is suitable only when lower isolation voltage is acceptable for the application.

Q: What is the difference between MOC8104SM and MOC8104SMT&R?

A: Both parts are from Isocom Components 2004 LTD with identical electrical specifications. The primary difference is packaging format: MOC8104SM is supplied in Tube format, while MOC8104SMT&R is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (MOC8101-X017T, MOC8102-X017, CNY17F4SR2M, MOC8104SM, MOC8104SMT&R) are ROHS3 compliant. The original MOC8104SD does not specify RoHS status in the provided data.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated assembly processes, and Tube for manual or lower-volume assembly. MOC8101-X017T and CNY17F4SR2M are supplied in Tape & Reel format. MOC8102-X017 and MOC8104SM are supplied in Tube format. MOC8104SMT&R is supplied in Tape & Reel format.

Q: Does the operating temperature range affect substitution decisions?

A: CNY17F4SR2M has an operating temperature range of -40°C to 100°C, which is narrower than the MOC8104SD's -55°C to 100°C range. All other substitutes maintain the full -55°C to 100°C range. Applications requiring operation below -40°C must use MOC8101-X017T, MOC8102-X017, MOC8104SM, or MOC8104SMT&R.