MCT2ETM Equivalent & Substitute Parts

Part Overview

The MCT2ETM is a single-channel optoisolator with transistor output and base connection, rated for 7500Vpk isolation voltage. Manufactured by onsemi in a 6-DIP through-hole package, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active or alternative manufacturers may be necessary for new designs or production continuity.

Substiute Parts

MCT2ETM

onsemiIn Stock: 5468MCT2ETM 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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MCT2EG

Isocom Components 2004 LTDIn Stock: 992MCT2EG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MCT2ETM is determined by the following critical parameters:

• Isolation Voltage: 7500Vpk minimum requirement
• Output Configuration: Transistor with base connection
• Number of Channels: Single channel
• Mounting Type: Through hole preferred for direct replacement
• Package Compatibility: 6-DIP form factor
• Current Transfer Ratio: Minimum 20% @ 10mA
• Output Voltage Rating: 30V maximum
• Vce Saturation: 400mV maximum

Substitute parts are grouped into two categories:

Category A - Direct Replacements (Same Isolation Voltage & Package) Parts meeting 7500Vpk isolation voltage in 6-DIP through-hole package with equivalent electrical characteristics.

Category B - Functional Alternatives (Different Isolation Voltage or Package) Parts with lower isolation voltage ratings (5000Vrms) or alternative mounting types that may serve in applications with relaxed isolation requirements or where package adaptation is acceptable.

Parameter Comparison

Engineering Selection Recommendations

H11A4M (onsemi) provides the closest electrical match with 7500Vpk isolation voltage, 6-DIP through-hole package, and equivalent switching characteristics. However, the package body height differs (0.300" vs 0.400"), which may affect PCB layout compatibility. Current Transfer Ratio minimum is reduced to 10%, requiring circuit verification.

H11A3M and H11A5M (Fairchild Semiconductor) both feature 5000Vrms isolation voltage, which is lower than the MCT2ETM specification. These parts are suitable only for applications where reduced isolation voltage is acceptable. Both offer extended operating temperature range (-55°C to 110°C) and higher maximum output voltage (80V). Product status is obsolete for both.

H11A2M (onsemi) matches isolation voltage and electrical parameters but uses surface-mount 6-SMD packaging instead of through-hole DIP. This requires PCB redesign and is not a direct mechanical replacement.

MCT2EG (Isocom Components 2004 LTD) is the only active product in this comparison set. However, its isolation voltage specification of 7.5Vpk is significantly lower than the MCT2ETM and is not suitable as a functional substitute for high-isolation applications. This part is listed only for reference and is not recommended for MCT2ETM replacement.

For new designs requiring MCT2ETM functionality, component selection should prioritize parts with matching isolation voltage (7500Vpk) and package compatibility (6-DIP through-hole). H11A4M is the preferred alternative despite the package dimension variance.

Frequently Asked Questions (FAQ)

Q: Can H11A3M or H11A5M replace MCT2ETM directly?

A: No. Both parts feature 5000Vrms isolation voltage, which is lower than the MCT2ETM's 7500Vpk rating. Use these parts only in applications where reduced isolation voltage meets design requirements.

Q: Is H11A2M a suitable replacement for MCT2ETM?

A: H11A2M matches electrical specifications and isolation voltage but uses surface-mount 6-SMD packaging instead of through-hole 6-DIP. Direct PCB substitution is not possible without redesign.

Q: What is the difference between H11A4M and MCT2ETM?

A: H11A4M maintains 7500Vpk isolation voltage and through-hole 6-DIP mounting. The primary differences are: package body height (0.300" vs 0.400"), reduced minimum Current Transfer Ratio (10% vs 20%), and forward voltage (1.18V vs 1.25V). Circuit performance must be verified for the lower CTR specification.

Q: Why is MCT2EG listed if it cannot replace MCT2ETM?

A: MCT2EG is included for reference as an active product in the optoisolator category. Its 7.5Vpk isolation voltage is insufficient for high-isolation applications and does not qualify as a functional substitute for MCT2ETM.

Q: What are the key parameters that determine substitution compatibility?

A: Isolation voltage, output configuration (transistor with base), number of channels (single), Current Transfer Ratio minimum, Vce saturation, and package form factor are the primary criteria. Mounting type (through-hole vs surface-mount) affects mechanical compatibility.

Q: Can I use a part with higher isolation voltage than MCT2ETM?

A: Yes. Parts rated for higher isolation voltage are backward compatible in applications requiring 7500Vpk or lower. However, availability and cost may differ.

Q: Are all listed substitutes currently in production?

A: No. MCT2ETM, H11A2M, H11A3M, H11A4M, and H11A5M are all classified as obsolete. MCT2EG is the only active product listed. For new production, verify long-term availability with component suppliers.