MCT2TM Equivalent & Substitute Parts

Part Overview

The MCT2TM is an optoisolator transistor with base output manufactured by onsemi, rated for 7500Vpk isolation voltage in a 6-DIP through-hole package. This component provides galvanic isolation for single-channel DC input applications with transistor output capability. The MCT2TM is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MCT2TM

onsemiIn Stock: 5259MCT2TM Datasheet

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H11A2M

onsemiIn Stock: 12552H11A2M Datasheet

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H11A3M

Fairchild SemiconductorIn Stock: 12690H11A3M Datasheet

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H11A4M

onsemiIn Stock: 12682H11A4M Datasheet

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H11A5M

Fairchild SemiconductorIn Stock: 12202H11A5M Datasheet

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MCT2G

Isocom Components 2004 LTDIn Stock: 2377MCT2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MCT2TM is determined by the following critical parameters:

• Isolation Voltage: 7500Vpk minimum requirement
• Number of Channels: Single channel only
• Output Type: Transistor with base configuration
• Current Transfer Ratio: Minimum 20% @ 10mA
• Package Type: 6-DIP through-hole mounting
• Vce Saturation: 400mV maximum
• Operating Temperature Range: Must encompass -40°C to 100°C

Substitute parts are grouped into two categories based on mounting compatibility and isolation voltage specifications:

Category A - Direct Through-Hole Equivalents (7500Vpk isolation): Parts maintaining identical 7500Vpk isolation voltage and through-hole 6-DIP packaging with compatible electrical characteristics.

Category B - Alternative Isolation Voltage (5000Vrms): Parts with reduced isolation voltage specification but compatible output characteristics and through-hole packaging, suitable for applications not requiring 7500Vpk isolation.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - H11A4M: This onsemi optoisolator maintains 7500Vpk isolation voltage, through-hole 6-DIP packaging with 0.300" pitch, and identical Vce saturation. The current transfer ratio minimum of 10% @ 10mA is lower than the MCT2TM specification of 20%, requiring verification that application gain margins accommodate this reduction. Operating temperature range matches the MCT2TM requirement.

Secondary Substitute - H11A5M: This Fairchild Semiconductor part provides 5000Vrms isolation voltage with through-hole 6-DIP packaging and 0.400" pitch matching MCT2TM dimensions. The current transfer ratio minimum of 30% @ 10mA exceeds MCT2TM specification. Operating temperature range extends to -55°C to 110°C. This substitute is suitable only for applications where 5000Vrms isolation meets design requirements. RoHS3 compliance is provided.

Alternative Substitute - MCT2G: This Isocom Components part is the only active product among the substitutes, with 7.5Vpk isolation voltage specification. This isolation voltage is significantly lower than the MCT2TM and is not suitable for applications requiring 7500Vpk isolation. This part is listed only for reference and is not recommended as a functional equivalent.

Not Recommended - H11A2M: Surface-mount 6-SMD packaging is incompatible with through-hole PCB designs requiring the MCT2TM form factor.

Not Recommended - H11A3M: While providing through-hole 6-DIP packaging, the 5000Vrms isolation voltage and extended operating temperature range (-55°C to 110°C) represent a different product class than the MCT2TM.

Frequently Asked Questions (FAQ)

Q: Can H11A4M directly replace MCT2TM in existing PCB designs?

A: H11A4M maintains through-hole 6-DIP packaging and 7500Vpk isolation voltage. However, the package pitch differs (0.300" vs 0.400"), requiring PCB layout verification. The reduced current transfer ratio minimum (10% vs 20%) must be evaluated against circuit gain requirements.

Q: What is the key difference between H11A3M and H11A5M?

A: Both are Fairchild Semiconductor parts with 5000Vrms isolation voltage and through-hole 6-DIP packaging. H11A3M has 20% minimum current transfer ratio, while H11A5M specifies 30% minimum. Both have extended operating temperature ranges (-55°C to 110°C) compared to MCT2TM.

Q: Is MCT2G a suitable replacement for MCT2TM?

A: No. MCT2G specifies 7.5Vpk isolation voltage, which is approximately 1000 times lower than MCT2TM's 7500Vpk requirement. This part is not functionally equivalent for isolation-critical applications.

Q: Why is H11A2M not recommended despite matching electrical specifications?

A: H11A2M uses surface-mount 6-SMD packaging with gull-wing leads, incompatible with through-hole PCB designs. The MCT2TM requires through-hole 6-DIP mounting.

Q: What compliance certifications are available for substitute parts?

A: H11A3M and H11A5M carry RoHS3 compliance certification. MCT2G carries RoHS3 compliance. H11A2M and H11A4M have REACH Unaffected status. All parts listed carry EAR99 ECCN classification.

Q: Can I use a substitute with lower isolation voltage if my application doesn't require 7500Vpk?

A: Yes, if your circuit design specifications permit. H11A3M and H11A5M with 5000Vrms isolation are suitable for applications with lower isolation requirements. Verify isolation voltage requirements against safety standards and application specifications before substitution.