MOC8107S Equivalent & Substitute Parts

Part Overview

The MOC8107S is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications. It provides 5300Vrms isolation voltage with a single channel configuration in a 6-SMD surface mount package. The device is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

MOC8107S

onsemiIn Stock: 3486MOC8107S Datasheet

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CNY17F3SM

onsemiIn Stock: 17828CNY17F3SM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC8107S is determined by the following critical parameters:

• Isolation Voltage: The MOC8107S provides 5300Vrms isolation. Substitute parts must maintain isolation voltage at or above this level to preserve circuit safety margins.
• Output Configuration: Single-channel transistor output with 70V maximum output voltage and 50mA per-channel current capability.
• Switching Characteristics: Turn-on/turn-off times of 2µs and 3µs respectively, with rise/fall times of 1µs and 2µs.
• Current Transfer Ratio: Operating range of 100% to 300% at 10mA input current.
• Package Compatibility: 6-SMD surface mount package with gull wing leads.
• Temperature Range: Operating from -55°C to 100°C.

The CNY17F3SM qualifies as a substitute based on matching the core functional parameters: single-channel transistor output optoisolator, 6-SMD package, 70V maximum output voltage, 50mA output current, and compatible switching characteristics. However, the isolation voltage specification differs, requiring engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The CNY17F3SM is an active product from onsemi and represents the primary substitute option for the obsolete MOC8107S. Both devices share identical package geometry, output voltage/current ratings, and switching timing characteristics, enabling direct PCB-level replacement without layout modifications.

Key differentiation factors:

• Isolation Voltage: The CNY17F3SM operates at 4170Vrms compared to the MOC8107S at 5300Vrms. Applications requiring the full 5300Vrms isolation margin must evaluate whether the reduced isolation specification of the substitute is acceptable for the intended circuit design.
• Current Transfer Ratio: The CNY17F3SM maximum CTR is 200% versus 300% for the MOC8107S, representing a tighter performance band that may affect circuit gain calculations.
• Temperature Range: The CNY17F3SM operates from -40°C to 100°C versus -55°C to 100°C for the MOC8107S. Applications requiring operation below -40°C cannot use this substitute.
• Product Status: The CNY17F3SM is active and in production, ensuring long-term availability and supply chain continuity.
• Compliance: The CNY17F3SM carries RoHS3 compliance certification, whereas the MOC8107S status is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F3SM be used as a direct replacement for the MOC8107S?

A: The CNY17F3SM is mechanically and functionally compatible at the package and pin level. However, the reduced isolation voltage (4170Vrms vs. 5300Vrms) and lower maximum CTR (200% vs. 300%) must be evaluated against your specific circuit requirements before implementation.

Q: What is the primary difference between these two optoisolators?

A: The MOC8107S provides higher isolation voltage (5300Vrms) and higher maximum current transfer ratio (300%), while the CNY17F3SM offers active product status and RoHS3 compliance. Both share identical 6-SMD packaging, output voltage/current ratings, and switching characteristics.

Q: Are there temperature range limitations with the CNY17F3SM?

A: Yes. The CNY17F3SM operates from -40°C to 100°C, whereas the MOC8107S operates from -55°C to 100°C. If your application requires operation below -40°C, the CNY17F3SM is not suitable.

Q: What certifications apply to each part?

A: Both parts are REACH Unaffected and classified as EAR99 for export control purposes. The CNY17F3SM carries RoHS3 compliance. Moisture sensitivity level is 1 (Unlimited) for both devices.

Q: How do the current transfer ratios compare?

A: The MOC8107S ranges from 100% to 300% at 10mA input, while the CNY17F3SM ranges from 100% to 200% at 10mA input. Both maintain a 100% minimum, but the MOC8107S offers higher maximum gain. Circuit designs relying on the upper CTR range may require recalibration for the CNY17F3SM.