MCT2 Optoisolator Equivalent & Substitute Parts

Part Overview

The MCT2 is a 5300Vrms optoisolator transistor with base output manufactured by onsemi in a 6-DIP package. This component provides galvanic isolation for DC input signals with transistor output capability. The MCT2 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MCT2

onsemiIn Stock: 2029MCT2 Datasheet

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4N25-000E

Broadcom LimitedIn Stock: 30614N25-000E Datasheet

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6N136

onsemiIn Stock: 501706N136 Datasheet

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MCT2

onsemiIn Stock: 2029MCT2 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MCT2 is determined by the following critical parameters:

• Isolation Voltage: Minimum 5300Vrms required for direct replacement
• Package Type: 6-DIP form factor for PCB compatibility
• Output Configuration: Transistor with base output
• Output Voltage Rating: Minimum 30V capability
• Output Current: Minimum 50mA per channel
• Operating Temperature Range: -55°C to 100°C
• Input Type: DC input
• Number of Channels: Single channel

Based on these criteria, the MCT2 has no direct pin-compatible substitute with equal or higher isolation voltage in the 6-DIP package. The 4N25-000E and 6N136 are functional alternatives with reduced isolation voltage ratings (2500Vrms) and different package configurations, suitable only for applications where lower isolation voltage is acceptable.

Parameter Comparison

Engineering Selection Recommendations

4N25-000E (Broadcom Limited): This part maintains the 6-DIP package footprint and supports higher output current (100mA) compared to the MCT2. However, isolation voltage is reduced to 2500Vrms. The 4N25-000E is active in production, ensuring long-term availability. Selection is appropriate for applications where isolation voltage requirements are 2500Vrms or lower.

6N136 (onsemi): This part provides 2500Vrms isolation in an 8-DIP package, requiring PCB layout modification. Output current capability is significantly reduced to 8mA, and maximum output voltage is limited to 20V. The 6N136 is obsolete. Selection requires verification that output current and voltage specifications meet application requirements.

For applications requiring 5300Vrms isolation in the original 6-DIP package, no direct substitute exists within the provided parts list.

Frequently Asked Questions (FAQ)

Q: Can the 4N25-000E directly replace the MCT2 on the same PCB?

A: The 4N25-000E shares the 6-DIP package footprint with the MCT2, enabling direct PCB replacement without layout modification. However, the isolation voltage is reduced from 5300Vrms to 2500Vrms. Substitution is valid only if the application isolation requirement is 2500Vrms or lower.

Q: What are the key differences between the MCT2 and 6N136?

A: The 6N136 uses an 8-DIP package instead of 6-DIP, requiring PCB redesign. Isolation voltage is reduced to 2500Vrms. Output current is limited to 8mA versus 50mA for the MCT2, and maximum output voltage is 20V versus 30V. These differences make the 6N136 unsuitable for applications requiring the MCT2's output current and voltage specifications.

Q: Why is the MCT2 listed as obsolete?

A: The MCT2 is classified as obsolete by the manufacturer. The 4N25-000E is the recommended active alternative for new designs, though with reduced isolation voltage.

Q: Are all listed parts REACH compliant?

A: All three parts (MCT2, 4N25-000E, and 6N136) have REACH Unaffected status, indicating compliance with REACH regulations.

Q: What is the moisture sensitivity level for these optoisolators?

A: All three parts have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling.