MSTC25-08 Equivalent & Substitute Parts

Part Overview

The MSTC25-08 is an obsolete SCR thyristor module manufactured by Microsemi Corporation, rated for 800 V off-state voltage with a 25 A on-state current rating. This chassis-mount module contains two series-connected SCRs and is designed for high-voltage switching applications requiring reliable gate triggering at 2.5 V maximum.

The MSTC25-08 has been discontinued and is no longer in active production. Equivalent substitute parts are available from IXYS Corporation with improved electrical performance characteristics and active product status, ensuring long-term availability and supply chain continuity.

Substiute Parts

MSTC25-08

Microsemi CorporationIn Stock: 1127MSTC25-08 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 MSTC25-08 is based on strict electrical and mechanical parameter alignment within the thyristor module category. The following criteria determine valid equivalents:

Primary Substitution Criteria:

• Voltage - Off State: 800 V (exact match required)
• Structure: Series Connection - All SCRs (exact match required)
• Number of SCRs: 2 (exact match required)
• Mounting Type: Chassis Mount (exact match required)
• Operating Temperature Range: -40°C to 125°C (exact match required)
• Current - Hold (Ih) (Max): 200 mA (exact match required)

Secondary Compatibility Parameters:

• Voltage - Gate Trigger (Vgt) (Max): Must not exceed 2.5 V
• Current - Gate Trigger (Igt) (Max): Must not exceed 150 mA
• Current - On State (It (AV)) (Max): Must meet or exceed 25 A minimum requirement

Both substitute parts meet all primary criteria and maintain compatibility with the original MSTC25-08 electrical specifications while offering enhanced current-handling capabilities.

Parameter Comparison

Engineering Selection Recommendations

MCC56-08IO1B Selection Criteria: The MCC56-08IO1B is suitable for applications where the MSTC25-08 is specified and gate trigger voltage requirements can accommodate the lower 1.5 V maximum specification. This part offers 64 A on-state current capacity, exceeding the original 25 A requirement. The part is ROHS3 compliant and REACH unaffected, with active product status ensuring continued availability. The TO-240AA package provides improved thermal management compared to the original module form factor.

MCC95-08IO1B Selection Criteria: The MCC95-08IO1B provides direct gate trigger voltage compatibility at 2.5 V maximum, matching the original MSTC25-08 specification exactly. This part delivers 116 A on-state current capacity with significantly enhanced surge current handling at 2250 A and 2400 A. The MCC95-08IO1B is ROHS3 compliant and REACH unaffected, with active product status. This substitute is recommended for applications requiring gate trigger voltage specifications identical to the original design.

Both substitute parts maintain the 800 V off-state voltage rating, 200 mA hold current, and -40°C to 125°C operating temperature range of the original MSTC25-08. Selection between the two IXYS alternatives depends on specific gate trigger voltage requirements and current capacity needs of the application.

Frequently Asked Questions (FAQ)

Q: Can the MCC56-08IO1B replace the MSTC25-08 in all applications?

A: The MCC56-08IO1B meets all primary electrical and mechanical substitution criteria. However, the gate trigger voltage maximum is 1.5 V compared to the original 2.5 V specification. Applications with gate drive circuits designed for 2.5 V operation require evaluation to confirm compatibility with the lower 1.5 V threshold.

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

A: Both parts share identical 800 V off-state voltage and 200 mA hold current specifications. The MCC95-08IO1B matches the original 2.5 V gate trigger voltage specification, while the MCC56-08IO1B operates at 1.5 V maximum. The MCC95-08IO1B provides higher on-state current capacity at 116 A versus 64 A for the MCC56-08IO1B.

Q: Are the substitute parts available in the same package as the MSTC25-08?

A: The MSTC25-08 uses a generic Module package type. The substitute parts use the TO-240AA package, which is a standardized chassis-mount form factor. Both substitute parts maintain chassis-mount configuration and are suitable for direct mechanical replacement in applications using standard TO-240AA mounting hardware.

Q: Do the substitute parts have the same operating temperature range?

A: Yes. Both MCC56-08IO1B and MCC95-08IO1B operate across the identical -40°C to 125°C junction temperature range as the original MSTC25-08.

Q: What compliance certifications apply to the substitute parts?

A: Both MCC56-08IO1B and MCC95-08IO1B are ROHS3 compliant and REACH unaffected. Both parts carry MSL 1 (Unlimited) moisture sensitivity level rating, matching the original MSTC25-08 specification.

Q: Why is the MSTC25-08 listed as obsolete?

A: The MSTC25-08 is no longer manufactured by Microsemi Corporation. The substitute parts from IXYS provide equivalent or superior electrical performance with active product status, ensuring long-term supply chain availability and technical support.

Q: Can I use either substitute part interchangeably?

A: Both parts are electrically compatible with the MSTC25-08 within the specified parameter ranges. Selection depends on gate trigger voltage requirements of the application circuit. The MCC95-08IO1B is recommended for designs requiring exact 2.5 V gate trigger voltage matching.