MSTC110-08 Equivalent & Substitute Parts

Part Overview

The MSTC110-08 is an obsolete SCR thyristor module manufactured by Microsemi Corporation, designed for high-current switching applications. This chassis-mount module contains two series-connected SCRs rated for 800 V off-state voltage and 110 A on-state current. The product has reached end-of-life status, necessitating identification of functionally equivalent alternatives from active manufacturers for continued system support and new designs.

Substiute Parts

MSTC110-08

Microsemi CorporationIn Stock: 1249MSTC110-08 Datasheet

Current PartRFQ

MCC56-08IO1B

IXYSIn Stock: 918MCC56-08IO1B Datasheet

SimilarRFQ

MCC95-08IO1B

IXYSIn Stock: 1029MCC95-08IO1B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MSTC110-08 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Off State: 800 V (must match exactly)
• Structure: Series Connection - All SCRs (must match exactly)
• Number of SCRs: 2 SCRs (must match exactly)
• Mounting Type: Chassis Mount (must match exactly)

Functional Compatibility Parameters:

• Current - On State (It (AV)) (Max): Substitute must meet or exceed 110 A
• Voltage - Gate Trigger (Vgt) (Max): Substitute must not exceed 3 V
• Current - Gate Trigger (Igt) (Max): Substitute must not exceed 150 mA
• Current - Non Rep. Surge 50, 60Hz (Itsm): Substitute must meet or exceed 2250 A
• Current - Hold (Ih) (Max): Substitute must not exceed 250 mA

Both identified substitute parts meet these criteria while offering active product status and modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

MCC95-08IO1B (IXYS) - Primary Substitute

The MCC95-08IO1B is the preferred substitute for the MSTC110-08. This part maintains full electrical equivalence across all critical parameters: 800 V off-state voltage, 116 A average on-state current (exceeding the 110 A requirement), 2 series-connected SCRs, and 2250 A non-repetitive surge current. The gate trigger voltage of 2.5 V remains within the 3 V maximum specification. The part carries active product status with ROHS3 compliance and REACH unaffected designation, ensuring long-term availability and regulatory alignment. The operating temperature range of -40°C to 125°C covers the primary operating window of the original part.

MCC56-08IO1B (IXYS) - Secondary Substitute

The MCC56-08IO1B provides an alternative substitute where lower on-state current capacity is acceptable. This part meets the 800 V voltage requirement and maintains the 2 series-connected SCR configuration. However, the 64 A average on-state current falls below the MSTC110-08 specification of 110 A, and the non-repetitive surge current of 1500-1600 A is reduced compared to the 2250 A requirement. This part is suitable only for applications with reduced current demands. The gate trigger voltage of 1.5 V provides improved gate sensitivity. Active product status and full compliance certifications are maintained.

Both substitute parts feature TO-240AA packaging, which differs from the original Module package type but maintains equivalent chassis-mount functionality.

Frequently Asked Questions (FAQ)

Q: Can the MCC56-08IO1B directly replace the MSTC110-08 in all applications?

A: No. The MCC56-08IO1B has a maximum average on-state current of 64 A, which is below the MSTC110-08 specification of 110 A. This part is suitable only for applications with on-state current requirements not exceeding 64 A. The non-repetitive surge current is also reduced to 1500-1600 A versus 2250 A. Verify application current requirements before selection.

Q: Is the MCC95-08IO1B a direct electrical equivalent?

A: Yes. The MCC95-08IO1B meets or exceeds all electrical parameters of the MSTC110-08: 800 V off-state voltage, 116 A average on-state current (exceeding 110 A), 2250 A non-repetitive surge current, and compatible gate trigger specifications. The part maintains the same series-connected dual SCR structure and chassis-mount configuration.

Q: What is the difference between the Module package and TO-240AA package?

A: Both are chassis-mount packages suitable for high-current thyristor applications. The Module designation refers to the original Microsemi packaging, while TO-240AA is the IXYS standard package designation. Both provide equivalent mechanical mounting and thermal performance for chassis-mount installations. Verify mechanical fit within the application enclosure.

Q: Are the substitute parts RoHS and REACH compliant?

A: Yes. Both MCC56-08IO1B and MCC95-08IO1B are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the operating temperature difference between the original and substitute parts?

A: The MSTC110-08 operates from -40°C to 130°C (TJ), while both substitute parts operate from -40°C to 125°C (TJ). The substitute parts have a 5°C lower maximum junction temperature. For applications requiring operation above 125°C, the original part specifications must be verified for alternative solutions.

Q: Can gate trigger voltage differences affect circuit operation?

A: Gate trigger voltage differences are within acceptable engineering margins. The MSTC110-08 specifies 3 V maximum, while MCC95-08IO1B specifies 2.5 V and MCC56-08IO1B specifies 1.5 V. Lower gate trigger voltages in substitute parts provide improved gate sensitivity and reduced gate drive requirements. Existing gate drive circuits designed for 3 V will operate reliably with these lower-voltage parts.

Q: What is the hold current specification and why does it matter?

A: Hold current (Ih) is the minimum current required to maintain SCR conduction after gate signal removal. The MSTC110-08 specifies 250 mA maximum, while both substitutes specify 200 mA maximum. The lower hold current in substitutes reduces minimum load current requirements and improves circuit efficiency in low-current conditions.