IRKT27/16A Equivalent & Substitute Parts

Part Overview

The IRKT27/16A is a dual SCR module manufactured by Vishay General Semiconductor - Diodes Division, rated for 1.6 kV off-state voltage with 27 A average on-state current and 60 A RMS on-state current. This component is configured as a series connection of two SCRs in an ADD-A-PAK (3 + 4) chassis mount package. The product is currently obsolete, making identification of equivalent and substitute parts essential for system maintenance, repair, and redesign applications where this module is specified.

Substiute Parts

IRKT27/16A

Vishay General Semiconductor - Diodes DivisionIn Stock: 968IRKT27/16A Datasheet

Current PartRFQ

MCC72-16IO1B

IXYSIn Stock: 100488MCC72-16IO1B Datasheet

MFR RecommendedRFQ

MCC95-16IO1B

IXYSIn Stock: 1263MCC95-16IO1B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRKT27/16A is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Requirements:

• Voltage - Off State: 1.6 kV (exact match required)
• Voltage - Gate Trigger (Vgt) (Max): 2.5 V (exact match required)
• Current - Gate Trigger (Igt) (Max): 150 mA (exact match required)
• Current - Hold (Ih) (Max): 200 mA (exact match required)
• Operating Temperature Range: -40°C ~ 125°C (exact match required)
• Structure: Series Connection - All SCRs (exact match required)
• Number of SCRs: 2 SCRs (exact match required)

Mechanical Compatibility Requirements:

• Mounting Type: Chassis Mount (exact match required)

Parameters Allowing Variation:

• Current - On State (It (AV)) (Max): Substitute must equal or exceed 27 A
• Current - On State (It (RMS)) (Max): Substitute must equal or exceed 60 A
• Current - Non Rep. Surge (Itsm): Substitute must equal or exceed 400 A / 420 A
• Package / Case: Alternative packages acceptable if mechanical mounting is compatible with chassis mount configuration
• RoHS Status: Active RoHS3 compliant parts are preferred over obsolete non-compliant parts
• Product Status: Active status preferred over obsolete status

The substitute parts MCC72-16IO1B and MCC95-16IO1B meet all critical electrical parameters and exceed current ratings, providing enhanced performance margins while maintaining full electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both MCC72-16IO1B and MCC95-16IO1B are suitable substitutes for the obsolete IRKT27/16A based on electrical parameter compatibility. Selection between these two options depends on application-specific surge current requirements and thermal management considerations.

MCC72-16IO1B Selection Criteria:

• Appropriate for applications where non-repetitive surge current requirements are 1700 A / 1800 A or lower
• Provides adequate performance margin over the original IRKT27/16A specification
• Active product status ensures long-term availability and supply chain stability
• ROHS3 compliance meets current regulatory requirements

MCC95-16IO1B Selection Criteria:

• Appropriate for applications requiring maximum surge current capability at 2250 A / 2400 A
• Highest performance margin among available substitutes
• Active product status ensures long-term availability
• ROHS3 compliance meets current regulatory requirements

Both substitute parts feature TO-240AA packaging, which differs from the original ADD-A-PAK (3 + 4) package. Mechanical mounting and thermal interface modifications may be required during integration. All three parts maintain identical gate trigger voltage, gate trigger current, hold current, and operating temperature specifications, ensuring functional compatibility in gate drive circuits and thermal management strategies.

Frequently Asked Questions (FAQ)

Q: Can MCC72-16IO1B and MCC95-16IO1B be used interchangeably with IRKT27/16A?

A: Both IXYS parts are electrically compatible with the IRKT27/16A across all critical parameters including voltage ratings, gate trigger specifications, and operating temperature range. The primary difference is packaging: the original uses ADD-A-PAK (3 + 4) while substitutes use TO-240AA. Mechanical mounting modifications are required. Both substitutes exceed the original current ratings, providing enhanced performance margins.

Q: What is the significance of the higher current ratings in MCC72-16IO1B and MCC95-16IO1B?

A: The substitute parts feature higher average on-state current (115 A and 116 A respectively versus 27 A) and higher non-repetitive surge current ratings (1700-2400 A versus 400-420 A). These higher ratings do not affect compatibility; they indicate enhanced thermal and electrical performance capability. Applications can operate within the original IRKT27/16A current specifications without modification.

Q: Are there packaging considerations when substituting these parts?

A: Yes. The IRKT27/16A uses ADD-A-PAK (3 + 4) chassis mount packaging, while MCC72-16IO1B and MCC95-16IO1B use TO-240AA chassis mount packaging. Both are chassis mount configurations, but the physical dimensions and mounting interface differ. PCB layout, heatsink interface, and mechanical mounting hardware require evaluation and potential redesign during substitution.

Q: What is the difference between MCC72-16IO1B and MCC95-16IO1B?

A: Both parts are electrically identical in gate trigger voltage, gate trigger current, hold current, and operating temperature. The primary difference is non-repetitive surge current rating: MCC72-16IO1B is rated 1700 A / 1800 A, while MCC95-16IO1B is rated 2250 A / 2400 A. Selection depends on application surge current requirements and thermal design margins.

Q: Why is the IRKT27/16A obsolete?

A: The IRKT27/16A is listed as obsolete by Vishay General Semiconductor - Diodes Division. This status indicates the part is no longer in active production. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Substitution with active parts such as MCC72-16IO1B or MCC95-16IO1B ensures continued availability for future production and maintenance requirements.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The IRKT27/16A is RoHS non-compliant, while both MCC72-16IO1B and MCC95-16IO1B are ROHS3 compliant. All three parts are REACH unaffected and classified as EAR99 for export control purposes. ROHS3 compliance of the substitute parts meets current regulatory requirements for electronic component manufacturing and distribution.