MOC8105 Equivalent & Substitute Parts

Part Overview

The MOC8105 is a transistor output optoisolator manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MOC8105 provides galvanic isolation with a single channel, transistor output configuration, and operates across an industrial temperature range of -55°C to 100°C.

Substiute Parts

MOC8105

onsemiIn Stock: 2484MOC8105 Datasheet

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CNY17F2M

Fairchild SemiconductorIn Stock: 5459CNY17F2M Datasheet

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MOC8106M

onsemiIn Stock: 2955MOC8106M Datasheet

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CNY17-2-000E

Broadcom LimitedIn Stock: 8318CNY17-2-000E Datasheet

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MOC8105

Fairchild SemiconductorIn Stock: 2428MOC8105 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC8105 is determined by the following critical parameters:

Primary Substitution Criteria:

• Isolation voltage rating (minimum 5000Vrms required for direct replacement)
• Output type (transistor configuration)
• Package compatibility (6-DIP through-hole)
• Single channel configuration
• Current transfer ratio range compatibility
• Operating temperature range overlap

Substitute Categories:

Direct Equivalents (5000Vrms and above isolation):

• CNY17-2-000E (Broadcom Limited): 5000Vrms isolation, transistor with base output, active product status
• MOC8105 (Fairchild Semiconductor): 5300Vrms isolation, identical electrical specifications, obsolete status

Functional Alternatives (4170Vrms isolation, reduced voltage rating):

• CNY17F2M (Fairchild Semiconductor): 4170Vrms isolation, transistor output, active product status
• MOC8106M (onsemi): 4170Vrms isolation, transistor output, active product status

The CNY17-2-000E and Fairchild MOC8105 maintain the full 5000Vrms+ isolation specification of the original onsemi MOC8105. The CNY17F2M and MOC8106M variants operate at reduced isolation voltage (4170Vrms) and are suitable only for applications where lower isolation ratings are acceptable.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (5000Vrms+ Isolation Required):

The CNY17-2-000E (Broadcom Limited) is the preferred active substitute. It maintains the 5000Vrms isolation specification, operates across the full -55°C to 100°C temperature range, and holds active product status with ROHS3 compliance. The CNY17-2-000E features a transistor with base output configuration, providing additional design flexibility. Current output capability is rated at 150mA per channel, exceeding the original 50mA specification.

The Fairchild MOC8105 provides identical electrical specifications to the onsemi original but carries obsolete product status, limiting its suitability for new designs despite current inventory availability.

For Reduced Isolation Applications (4170Vrms Acceptable):

The MOC8106M (onsemi) and CNY17F2M (Fairchild Semiconductor) both operate at 4170Vrms isolation and are active products. The MOC8106M is manufactured by the original supplier and maintains onsemi product continuity. The CNY17F2M offers equivalent performance with active status from Fairchild Semiconductor. Both support the full -40°C to 100°C operating range, though the lower temperature limit is -40°C rather than -55°C.

Compliance Considerations:

The CNY17-2-000E and MOC8106M both carry ROHS3 compliance certification. All substitute parts maintain EAR99 export classification and REACH unaffected status, matching the original MOC8105 regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can the CNY17-2-000E directly replace the MOC8105 in all applications?

A: The CNY17-2-000E maintains the required 5000Vrms isolation voltage and operates across the same -55°C to 100°C temperature range. The primary difference is the transistor with base output configuration versus standard transistor output. Applications requiring base access will benefit from this feature. Applications not utilizing the base connection will function identically. Maximum output current is 150mA versus 50mA on the original, providing additional design margin.

Q: What is the impact of using MOC8106M or CNY17F2M with 4170Vrms isolation instead of 5300Vrms?

A: The 4170Vrms rating is suitable only for applications where the isolation requirement does not exceed this voltage. If the original design specified 5300Vrms isolation for safety margins or regulatory compliance, the reduced rating may not be acceptable. The lower operating temperature minimum of -40°C versus -55°C must also be evaluated for cold environment applications.

Q: Are all substitute parts available in the same 6-DIP package?

A: Yes. All listed substitutes use the 6-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts and socket designs.

Q: Which substitute offers the best long-term availability?

A: The CNY17-2-000E, MOC8106M, and CNY17F2M all carry active product status, indicating ongoing manufacturing and supply. The onsemi MOC8106M provides continuity with the original manufacturer. The Broadcom CNY17-2-000E offers the highest isolation voltage among active products.

Q: Do the substitutes maintain the same current transfer ratio specifications?

A: The CNY17-2-000E and Fairchild MOC8105 maintain identical current transfer ratio ranges (65% to 133% @ 10mA). The MOC8106M offers a wider range (50% to 150% @ 10mA), providing greater design flexibility. The CNY17F2M specifies 63% to 125% @ 10mA, slightly narrower than the original.

Q: What are the differences in output voltage ratings?

A: The original MOC8105 is rated for 30V maximum output voltage. The CNY17-2-000E, CNY17F2M, and MOC8106M all support 70V maximum output voltage, providing greater flexibility for higher voltage switching applications.