MOC8111TM Equivalent & Substitute Parts

Part Overview

The MOC8111TM is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications requiring 7500Vpk isolation rating. This component features a single channel configuration in a 6-DIP through-hole package and is currently classified as obsolete. Due to its obsolete status, identifying functionally compatible substitute parts is essential for ongoing design support, production continuity, and system maintenance.

Substiute Parts

MOC8111TM

onsemiIn Stock: 5231MOC8111TM Datasheet

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CNY17F1TVM

onsemiIn Stock: 1058CNY17F1TVM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the MOC8111TM is determined by the following critical parameters:

• Package compatibility: 6-DIP through-hole form factor ensures mechanical and electrical pin alignment
• Isolation voltage rating: Minimum 4170Vrms (equivalent to 5900Vpk) maintains isolation performance for most applications, though the MOC8111TM's 7500Vpk rating provides higher margin
• Output type: Transistor output configuration must be preserved
• Single channel configuration: One isolated channel required
• Operating temperature range: -40°C to 100°C compatibility
• DC input type: Direct current input requirement
• Maximum output voltage: 70V rating
• Vce saturation: 400mV maximum specification

The CNY17F1TVM meets these substitution criteria while offering active product status and improved current transfer ratio performance.

Parameter Comparison

Engineering Selection Recommendations

The CNY17F1TVM is the qualified substitute for the obsolete MOC8111TM based on the following engineering criteria:

Product Status: The CNY17F1TVM maintains active product status with onsemi, ensuring long-term availability and manufacturing support compared to the obsolete MOC8111TM.

Compliance and Certifications: Both parts share identical REACH Unaffected status and EAR99 ECCN classification. The CNY17F1TVM additionally carries RoHS3 compliance, meeting modern regulatory requirements.

Electrical Compatibility: The CNY17F1TVM isolation voltage of 4170Vrms is lower than the MOC8111TM's 7500Vpk rating. This substitution is valid for applications where the isolation requirement does not exceed 4170Vrms. For applications requiring the full 7500Vpk isolation margin, alternative parts with higher isolation ratings must be evaluated.

Performance Improvements: The CNY17F1TVM offers superior current transfer ratio (40% minimum vs. 20% minimum) and faster turn-off time (3µs vs. 18µs), providing improved switching performance in most applications.

Package Compatibility: Identical 6-DIP through-hole package ensures direct mechanical and electrical compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F1TVM directly replace the MOC8111TM without PCB modifications?

A: Yes, the CNY17F1TVM uses the identical 6-DIP through-hole package with matching pin configuration, allowing direct socket replacement without PCB layout changes.

Q: What is the key difference in isolation voltage between these parts?

A: The MOC8111TM provides 7500Vpk isolation, while the CNY17F1TVM provides 4170Vrms isolation. For applications requiring isolation voltage above 4170Vrms, the CNY17F1TVM may not be suitable. Verify your application's isolation requirement before substitution.

Q: Does the CNY17F1TVM meet current regulatory compliance standards?

A: Yes, the CNY17F1TVM is RoHS3 compliant and maintains REACH Unaffected status, meeting current environmental and regulatory requirements. The obsolete MOC8111TM does not carry RoHS3 certification.

Q: How do the switching characteristics compare?

A: The CNY17F1TVM offers faster switching performance with 2µs turn-on time (vs. 3µs) and significantly faster turn-off time of 3µs (vs. 18µs). This improvement may benefit high-frequency switching applications.

Q: What are the current transfer ratio implications?

A: The CNY17F1TVM minimum current transfer ratio is 40% @ 10mA, compared to 20% @ 10mA for the MOC8111TM. This higher ratio provides better optical coupling efficiency and may reduce input current requirements in your circuit design.

Q: Are there any input or output voltage differences?

A: Both parts maintain identical maximum output voltage (70V) and Vce saturation (400mV) specifications. Input type (DC) and output type (transistor) are identical. Forward voltage differs slightly (1.35V vs. 1.15V), which may require minor input circuit adjustment.