MOC8108300 Equivalent & Substitute Parts

Part Overview

The MOC8108300 is an optoisolator with transistor output manufactured by onsemi, featuring 5300Vrms isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MOC8108300

onsemiIn Stock: 5124MOC8108300 Datasheet

Current PartRFQ

CNY17F4VM

onsemiIn Stock: 1091CNY17F4VM Datasheet

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MOC8108

onsemiIn Stock: 1353MOC8108 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC8108300 is determined by the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Single-channel transistor output optoisolator
• 6-DIP through-hole package (0.300", 7.62mm)
• Isolation voltage rating (5300Vrms or higher acceptable)
• Maximum output voltage: 70V
• Maximum output current: 50mA per channel
• Input type: DC
• Operating temperature range compatibility

Acceptable Substitution Logic: Parts meeting all primary criteria with equivalent or superior isolation voltage, current transfer ratio, and thermal operating range are considered direct substitutes. Parts with lower isolation voltage (4170Vrms) are acceptable only where the application does not require the full 5300Vrms isolation specification.

Parameter Comparison

Engineering Selection Recommendations

MOC8108 (Equivalent): The MOC8108 is a direct equivalent to the MOC8108300, sharing identical electrical specifications and package configuration. Both parts are classified as obsolete. Selection between these parts depends on inventory availability and procurement lead times. No functional differences exist between the two variants.

CNY17F4VM (Substitute with Reduced Isolation): The CNY17F4VM is an active production substitute manufactured by onsemi with ROHS3 compliance. This part maintains the same package, output type, and maximum voltage/current ratings. The primary differences are reduced isolation voltage (4170Vrms versus 5300Vrms), lower current transfer ratio range (160-320% versus 250-600%), reduced maximum forward current (60mA versus 100mA), and narrower operating temperature range (-40°C to 100°C versus -55°C to 100°C). The CNY17F4VM is suitable for applications where 4170Vrms isolation is sufficient and where the lower temperature minimum does not conflict with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the CNY17F4VM directly replace the MOC8108300 in all applications?

A: The CNY17F4VM is mechanically and functionally compatible in terms of package and basic output characteristics. However, applications requiring 5300Vrms isolation voltage must use the MOC8108300 or MOC8108. Applications with lower isolation requirements and operating temperatures above -40°C can use the CNY17F4VM.

Q: What is the primary difference between MOC8108300 and MOC8108?

A: These parts are electrically and mechanically identical. The difference is in the part number suffix. Both are obsolete products from onsemi.

Q: Is the CNY17F4VM RoHS compliant?

A: Yes, the CNY17F4VM is ROHS3 compliant. The MOC8108300 and MOC8108 RoHS status is not specified in the available data.

Q: What isolation voltage should I specify for my application?

A: Isolation voltage selection depends on the maximum voltage differential between input and output circuits. The MOC8108300 and MOC8108 provide 5300Vrms isolation. The CNY17F4VM provides 4170Vrms isolation. Select the part with isolation voltage equal to or exceeding your application requirement.

Q: Are all three parts available in the same package?

A: Yes, all three parts use the 6-DIP (0.300", 7.62mm) through-hole package and are pin-compatible for PCB mounting.

Q: What is the current transfer ratio and why does it matter?

A: Current transfer ratio (CTR) is the ratio of output collector current to input LED current, expressed as a percentage. The MOC8108300 and MOC8108 specify 250-600% CTR at 10mA input current, while the CNY17F4VM specifies 160-320% CTR. Higher CTR values indicate more efficient optical coupling and may affect circuit design margins.