MSTC40-08 Equivalent & Substitute Parts

Part Overview

The MSTC40-08 is an SCR (Silicon Controlled Rectifier) thyristor module manufactured by Microsemi Corporation, rated for 800 V off-state voltage with a 40 A on-state current capacity. This chassis-mount module contains two series-connected SCRs and is designed for high-voltage switching applications. The MSTC40-08 is classified as obsolete, making identification of equivalent active alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

MSTC40-08

Microsemi CorporationIn Stock: 765MSTC40-08 Datasheet

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MCC56-08IO1B

IXYSIn Stock: 918MCC56-08IO1B Datasheet

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MCC95-08IO1B

IXYSIn Stock: 1029MCC95-08IO1B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MSTC40-08 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Criteria:

• Voltage - Off State: 800 V (exact match required)
• Structure: Series Connection - All SCRs (exact match required)
• Number of SCRs: 2 SCRs (exact match required)
• Mounting Type: Chassis Mount (exact match required)
• Operating Temperature Range: -40°C ~ 125°C (exact match required)

Allowable Parameter Variations:

• Current - On State (It (AV)) (Max): Substitute must equal or exceed 40 A
• Voltage - Gate Trigger (Vgt) (Max): Substitute must equal or be less than 2.5 V
• Current - Gate Trigger (Igt) (Max): Substitute must equal or be less than 150 mA
• Current - Hold (Ih) (Max): Substitute must equal or be less than 250 mA
• Current - Non Rep. Surge (Itsm): Substitute must equal or exceed 1000 A @ 50Hz

Both identified substitute parts meet all mandatory matching criteria and satisfy allowable parameter variations.

Parameter Comparison

Engineering Selection Recommendations

MCC56-08IO1B Selection Criteria: The MCC56-08IO1B is an active IXYS product with ROHS3 compliance and REACH unaffected status. This substitute provides 64 A on-state current capacity, exceeding the MSTC40-08 requirement of 40 A. The gate trigger voltage is reduced to 1.5 V (lower than the 2.5 V maximum of the original), and gate trigger current is reduced to 100 mA (lower than the 150 mA maximum). The non-repetitive surge current rating of 1500 A and 1600 A exceeds the original 1000 A specification. The TO-240AA package provides equivalent chassis-mount functionality. This substitute is suitable for applications where the lower gate trigger parameters and higher current capacity are compatible with system design requirements.

MCC95-08IO1B Selection Criteria: The MCC95-08IO1B is an active IXYS product with ROHS3 compliance and REACH unaffected status. This substitute provides 116 A on-state current capacity, significantly exceeding the MSTC40-08 requirement of 40 A. The gate trigger voltage matches the original specification at 2.5 V maximum, and gate trigger current matches at 150 mA maximum. The non-repetitive surge current rating of 2250 A and 2400 A substantially exceeds the original 1000 A specification. The TO-240AA package provides equivalent chassis-mount functionality. This substitute maintains identical gate trigger parameters to the original part while providing enhanced current handling capability.

Both substitutes are active products from a qualified manufacturer with current compliance certifications, addressing the obsolescence of the MSTC40-08.

Frequently Asked Questions (FAQ)

Q: Can the MCC56-08IO1B or MCC95-08IO1B be used as direct replacements for the MSTC40-08?

A: Both parts satisfy the mandatory electrical and mechanical parameters: 800 V off-state voltage, 2 SCRs in series connection, chassis-mount configuration, and -40°C to 125°C operating temperature range. Both exceed the minimum 40 A on-state current requirement and meet or exceed the non-repetitive surge current specification. Compatibility depends on system-specific gate trigger requirements and current handling needs.

Q: What is the difference between MCC56-08IO1B and MCC95-08IO1B?

A: The primary differences are on-state current capacity and non-repetitive surge current rating. The MCC56-08IO1B provides 64 A average on-state current and 100 A RMS, with 1500 A and 1600 A surge ratings. The MCC95-08IO1B provides 116 A average on-state current and 180 A RMS, with 2250 A and 2400 A surge ratings. The MCC56-08IO1B has a lower gate trigger voltage of 1.5 V, while the MCC95-08IO1B matches the original 2.5 V specification.

Q: Are there package differences between the MSTC40-08 and the substitute parts?

A: The MSTC40-08 uses a generic Module package designation, while both MCC56-08IO1B and MCC95-08IO1B use the TO-240AA package. Both are chassis-mount configurations suitable for equivalent mechanical integration. Physical dimensions and mounting hole patterns should be verified for specific application requirements.

Q: Do the substitute parts have current compliance certifications?

A: Both MCC56-08IO1B and MCC95-08IO1B are ROHS3 compliant and REACH unaffected. The MSTC40-08 compliance status is not specified in available documentation.

Q: What is the moisture sensitivity level of the substitute parts?

A: Both MCC56-08IO1B and MCC95-08IO1B have Moisture Sensitivity Level 1 (Unlimited), matching the MSTC40-08 specification.

Q: Which substitute part should be selected for a direct current replacement?

A: The MCC95-08IO1B maintains identical gate trigger parameters (Vgt 2.5 V max, Igt 150 mA max) to the MSTC40-08, making it the preferred selection when gate trigger characteristics are critical to system operation. The MCC56-08IO1B is suitable when lower gate trigger voltage and current are compatible with system design.