MOC8105SD Equivalent & Substitute Parts

Part Overview

The MOC8105SD is an optoisolator with transistor output manufactured by onsemi, featuring 5300Vrms isolation voltage and single-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 MOC8105SD serves applications requiring galvanic isolation with DC input and transistor output topology.

Substiute Parts

MOC8105SD

onsemiIn Stock: 5491MOC8105SD Datasheet

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CNY17F2SR2M

Fairchild SemiconductorIn Stock: 12716CNY17F2SR2M Datasheet

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MOC8105SM

Isocom Components 2004 LTDIn Stock: 1187MOC8105SM Datasheet

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MOC8105SMT&R

Isocom Components 2004 LTDIn Stock: 1099MOC8105SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MOC8105SD are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Single-channel configuration (Number of Channels = 1)
• Transistor output topology
• 6-SMD surface mount package with gull wing leads
• DC input type
• Maximum output voltage capability ≥ 30V
• Maximum output current ≥ 50mA per channel
• Vce saturation ≤ 400mV
• Operating temperature range encompassing -55°C to 100°C

Isolation Voltage Consideration: The MOC8105SD specifies 5300Vrms isolation. Substitute parts with lower isolation voltage (such as CNY17F2SR2M at 4170Vrms) remain functionally compatible when the application does not require the full 5300Vrms specification. Parts with equal or higher isolation voltage provide direct substitution without derating.

Current Transfer Ratio: Substitute parts must maintain current transfer ratio specifications within ranges suitable for the application's signal transfer requirements.

Parameter Comparison

Engineering Selection Recommendations

MOC8105SM and MOC8105SMT&R (Isocom Components): These parts are direct series equivalents manufactured by Isocom under the MOC8105 base product number. Both maintain identical electrical specifications for output voltage, output current, saturation voltage, and operating temperature range as the obsolete MOC8105SD. Both are active products with ROHS3 compliance. Selection between MOC8105SM (tube packaging) and MOC8105SMT&R (tape & reel packaging) depends on procurement and assembly requirements. These represent the primary substitution path for the obsolete onsemi part.

CNY17F2SR2M (Fairchild Semiconductor): This part is an active optoisolator meeting the core functional requirements: single-channel transistor output, 6-SMD gull wing package, 50mA output current, and 400mV saturation voltage. The isolation voltage specification (4170Vrms) is lower than the MOC8105SD (5300Vrms), making this substitute suitable only for applications where the lower isolation rating is acceptable. The maximum output voltage (70V) exceeds the MOC8105SD specification (30V). Operating temperature range is -40°C to 100°C, which does not extend to -55°C. This part is suitable for applications not requiring the full temperature range or isolation voltage of the original part.

Frequently Asked Questions (FAQ)

Q: Can MOC8105SM or MOC8105SMT&R directly replace MOC8105SD without circuit modification?

A: Yes. Both Isocom parts maintain electrical compatibility across all critical parameters: single-channel configuration, transistor output, 30V maximum output voltage, 50mA output current, 400mV saturation voltage, and -55°C to 100°C operating temperature. The difference between MOC8105SM and MOC8105SMT&R is packaging format only (tube versus tape & reel), not electrical performance.

Q: Is CNY17F2SR2M suitable as a substitute for MOC8105SD?

A: CNY17F2SR2M is functionally compatible for applications where isolation voltage requirements do not exceed 4170Vrms and operating temperature does not require -55°C operation. The part meets output voltage, output current, and saturation voltage specifications. Verify application isolation voltage and temperature requirements before selection.

Q: What is the difference between MOC8105SM and MOC8105SMT&R?

A: Both parts are electrically identical. MOC8105SM is supplied in tube packaging, while MOC8105SMT&R is supplied in tape & reel format. Selection depends on assembly process requirements and procurement volume.

Q: Are all substitute parts RoHS compliant?

A: MOC8105SM and MOC8105SMT&R are ROHS3 compliant. RoHS status for CNY17F2SR2M is not specified in available data. Verify RoHS compliance requirements with your procurement specification.

Q: Do all substitute parts use the same 6-SMD gull wing package?

A: Yes. All listed substitute parts use 6-SMD surface mount package with gull wing leads, ensuring PCB footprint compatibility with the original MOC8105SD design.