IRKT71/08A SCR Module 800V 75A Equivalent & Substitute Parts

Part Overview

The IRKT71/08A is a thyristor module manufactured by Vishay General Semiconductor - Diodes Division, configured as a series connection SCR/Diode assembly rated for 800V off-state voltage and 75A average on-state current. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The module features ADD-A-PAK (3 + 4) packaging with chassis mount configuration and operates across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Current - On State (It (AV)) (Max)	75 A
Current - On State (It (RMS)) (Max)	165 A
Voltage - Gate Trigger (Vgt) (Max)	2.5 V
Current - Gate Trigger (Igt) (Max)	150 mA
Current - Hold (Ih) (Max)	200 mA
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Chassis Mount
Package / Case	ADD-A-PAK (3 + 4)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the IRKT71/08A is determined by the following critical electrical and mechanical parameters:

Voltage Rating: All substitute parts maintain 800V off-state voltage, matching the primary design requirement
Current Capacity: Substitute parts are grouped by their average on-state current (It (AV)) ratings, ranging from 32A to 115A
Gate Trigger Characteristics: Voltage and current thresholds determine gate drive compatibility
Thermal Performance: Operating temperature range remains consistent across all alternatives
Mounting Configuration: All substitutes maintain chassis mount configuration for mechanical compatibility
Package Type: Substitute parts transition from ADD-A-PAK to TO-240AA packaging, requiring mechanical redesign consideration

The IXYS MCC-series thyristor modules (MCC26-08IO1B, MCC44-08IO1B, MCC56-08IO1B, MCC72-08IO1B, MCC95-08IO1B) are qualified substitutes based on matching voltage class, thermal range, and gate trigger specifications. These parts feature active product status and RoHS3 compliance, addressing obsolescence and regulatory requirements.

Parameter Comparison

Parameter	IRKT71/08A	MCC26-08IO1B	MCC44-08IO1B	MCC56-08IO1B	MCC72-08IO1B	MCC95-08IO1B
Manufacturer	Vishay	IXYS	IXYS	IXYS	IXYS	IXYS
Voltage - Off State	800 V	800 V	800 V	800 V	800 V	800 V
Current - On State (It (AV)) (Max)	75 A	32 A	51 A	64 A	115 A	116 A
Current - On State (It (RMS)) (Max)	165 A	50 A	80 A	100 A	180 A	180 A
Voltage - Gate Trigger (Vgt) (Max)	2.5 V	1.5 V	1.5 V	1.5 V	2.5 V	2.5 V
Current - Gate Trigger (Igt) (Max)	150 mA	100 mA	100 mA	100 mA	150 mA	150 mA
Current - Hold (Ih) (Max)	200 mA	200 mA	200 mA	200 mA	200 mA	200 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	ADD-A-PAK (3 + 4)	TO-240AA	TO-240AA	TO-240AA	TO-240AA	TO-240AA
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Selection among the IXYS MCC-series substitutes depends on application current requirements and gate drive circuit compatibility:

MCC72-08IO1B and MCC95-08IO1B are the closest functional equivalents to the IRKT71/08A, offering 115A and 116A average on-state current respectively, matching the original 75A specification with margin. Both maintain the 2.5V gate trigger voltage and 150mA gate trigger current of the original part, ensuring gate drive circuit compatibility without modification. These parts feature active product status and RoHS3 compliance.

MCC56-08IO1B provides 64A average on-state current with 1.5V gate trigger voltage, suitable for applications where the original 75A capacity is not fully utilized and lower gate drive requirements are acceptable.

MCC44-08IO1B offers 51A average on-state current with 1.5V gate trigger voltage, appropriate for reduced-current applications.

MCC26-08IO1B provides 32A average on-state current with 1.5V gate trigger voltage, suitable only for applications with significantly reduced current demands.

All substitute parts require mechanical redesign due to package transition from ADD-A-PAK (3 + 4) to TO-240AA. All substitutes maintain 800V voltage rating, -40°C to 125°C operating temperature range, and chassis mount configuration.

Frequently Asked Questions (FAQ)

Q: Can MCC26-08IO1B, MCC44-08IO1B, or MCC56-08IO1B directly replace IRKT71/08A in existing designs?

A: These parts share the 800V voltage rating and operating temperature range but feature lower average on-state current ratings (32A, 51A, and 64A respectively) compared to the original 75A specification. Selection depends on actual application current requirements. Additionally, the package transition from ADD-A-PAK to TO-240AA requires mechanical redesign.

Q: What is the significance of the gate trigger voltage difference between MCC72-08IO1B/MCC95-08IO1B and MCC26-08IO1B/MCC44-08IO1B/MCC56-08IO1B?

A: MCC72-08IO1B and MCC95-08IO1B maintain the original 2.5V gate trigger voltage specification, allowing direct gate drive circuit compatibility. MCC26-08IO1B, MCC44-08IO1B, and MCC56-08IO1B feature 1.5V gate trigger voltage, which may require gate drive circuit adjustment depending on the original design margin.

Q: Are all substitute parts RoHS compliant?

A: Yes, all IXYS MCC-series substitutes (MCC26-08IO1B, MCC44-08IO1B, MCC56-08IO1B, MCC72-08IO1B, MCC95-08IO1B) are ROHS3 compliant, addressing regulatory requirements that the original IRKT71/08A does not meet.

Q: What mechanical considerations apply when transitioning from ADD-A-PAK to TO-240AA packaging?

A: The package transition requires redesign of the mounting interface and thermal management solution. TO-240AA packaging features different pin configuration and mounting hole pattern compared to ADD-A-PAK (3 + 4). Thermal interface materials and heatsink mounting must be re-evaluated for the new package geometry.

Q: Which substitute part offers the best current capacity match to the original IRKT71/08A?

A: MCC72-08IO1B and MCC95-08IO1B both provide 115A and 116A average on-state current respectively, exceeding the original 75A specification. MCC72-08IO1B is the preferred selection when gate trigger voltage compatibility with the original 2.5V specification is required.

Q: Do all substitute parts maintain the same hold current specification?

A: Yes, all substitute parts maintain 200mA maximum hold current, matching the original IRKT71/08A specification.

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