IRKT26/12A Equivalent & Substitute Parts

Part Overview

The IRKT26/12A is a SCR (Silicon Controlled Rectifier) module manufactured by Vishay General Semiconductor - Diodes Division, rated for 1.2 kV off-state voltage with 27 A average on-state current and 60 A RMS on-state current. This component features a series connection configuration with one SCR and one diode in an ADD-A-PAK (3 + 4) chassis mount package. The product is currently obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	IRKT26/12A
Voltage - Off State	1.2 kV
Current - On State (It (AV)) (Max)	27 A
Current - On State (It (RMS)) (Max)	60 A
Voltage - Gate Trigger (Vgt) (Max)	2.5 V
Current - Gate Trigger (Igt) (Max)	150 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	400A, 420A
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 eligibility for the IRKT26/12A is determined by the following critical parameters:

Voltage - Off State: Must equal 1.2 kV
Current - On State (It (AV)) (Max): Must meet or exceed 27 A
Current - On State (It (RMS)) (Max): Must meet or exceed 60 A
Voltage - Gate Trigger (Vgt) (Max): Must not exceed 2.5 V
Current - Gate Trigger (Igt) (Max): Must not exceed 150 mA
Current - Hold (Ih) (Max): Must not exceed 200 mA
Operating Temperature Range: Must encompass -40°C ~ 125°C (TJ)
Mounting Type: Chassis Mount required

All three substitute parts (MCC26-12IO1B, MCC72-12IO1B, MCC95-12IO1B) meet these electrical and mechanical requirements. The primary difference between substitutes lies in current capacity and surge current ratings, allowing selection based on specific application demands.

Parameter Comparison

Parameter	IRKT26/12A	MCC26-12IO1B	MCC72-12IO1B	MCC95-12IO1B
Manufacturer	Vishay General Semiconductor	IXYS	IXYS	IXYS
Voltage - Off State	1.2 kV	1.2 kV	1.2 kV	1.2 kV
Current - On State (It (AV)) (Max)	27 A	32 A	115 A	116 A
Current - On State (It (RMS)) (Max)	60 A	50 A	180 A	180 A
Voltage - Gate Trigger (Vgt) (Max)	2.5 V	1.5 V	2.5 V	2.5 V
Current - Gate Trigger (Igt) (Max)	150 mA	100 mA	150 mA	150 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	400A, 420A	520A, 560A	1700A, 1800A	2250A, 2400A
Current - Hold (Ih) (Max)	200 mA	200 mA	200 mA	200 mA
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	ADD-A-PAK (3 + 4)	TO-240AA	TO-240AA	TO-240AA
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance, providing regulatory advantage over the obsolete IRKT26/12A. Selection among substitutes depends on application current requirements:

MCC26-12IO1B provides the closest current rating match with 32 A average and 50 A RMS on-state current, suitable for applications requiring minimal current margin above the original 27 A specification. This part features a lower gate trigger voltage (1.5 V maximum) and reduced gate trigger current (100 mA maximum), which may require circuit design consideration.

MCC72-12IO1B and MCC95-12IO1B offer significantly higher current capacity at 115-116 A average and 180 A RMS on-state current, appropriate for applications requiring substantial current headroom or future design scaling. Both parts maintain the original gate trigger specifications (2.5 V maximum, 150 mA maximum).

All substitutes employ TO-240AA packaging instead of the original ADD-A-PAK (3 + 4), requiring mechanical redesign of mounting interfaces. All parts maintain identical off-state voltage (1.2 kV), hold current (200 mA maximum), and operating temperature range (-40°C ~ 125°C).

Frequently Asked Questions (FAQ)

Q: Can MCC26-12IO1B directly replace IRKT26/12A without circuit modification?

A: MCC26-12IO1B meets all electrical substitution criteria but features a lower gate trigger voltage (1.5 V versus 2.5 V maximum). Gate drive circuits must be evaluated to ensure compatibility with this reduced threshold. Mechanical redesign is required due to TO-240AA versus ADD-A-PAK (3 + 4) package differences.

Q: What is the primary difference between MCC72-12IO1B and MCC95-12IO1B?

A: Both parts share identical electrical specifications (1.2 kV off-state voltage, 115-116 A average current, 180 A RMS current, 2.5 V gate trigger voltage, 150 mA gate trigger current). The primary distinction is surge current rating: MCC72-12IO1B rated for 1700A/1800A (50/60Hz) versus MCC95-12IO1B rated for 2250A/2400A (50/60Hz).

Q: Is package conversion from ADD-A-PAK (3 + 4) to TO-240AA feasible?

A: Package conversion requires mechanical redesign of the mounting interface and thermal management system. TO-240AA is a standard chassis mount package with established thermal characteristics. Thermal performance must be re-evaluated for the specific application.

Q: Are all substitute parts RoHS compliant?

A: Yes. MCC26-12IO1B, MCC72-12IO1B, and MCC95-12IO1B are all ROHS3 compliant, providing regulatory compliance improvement over the non-compliant IRKT26/12A.

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

A: MCC26-12IO1B provides the closest current rating (32 A average, 50 A RMS) to the original IRKT26/12A (27 A average, 60 A RMS). However, gate trigger voltage differences require circuit evaluation. For applications with no gate drive constraints, MCC72-12IO1B or MCC95-12IO1B offer superior surge current protection with identical gate specifications to the original part.

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