MCR25M SCR 600V 25A TO-220AB Equivalent & Substitute Parts

Part Overview

The MCR25M is a Silicon Controlled Rectifier (SCR) rated for 600V off-state voltage and 25A on-state RMS current in a TO-220-3 through-hole package. Manufactured by onsemi, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying equivalent and substitute parts from active manufacturers is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	600	V
Voltage - Gate Trigger (Vgt) Max	1	V
Current - Gate Trigger (Igt) Max	30	mA
Voltage - On State (Vtm) Max	1.8	V
Current - On State (It RMS) Max	25	A
Current - Hold (Ih) Max	40	mA
Current - Off State Max	10	µA
Current - Non Rep. Surge (60Hz)	300	A
SCR Type	Standard Recovery	—
Operating Temperature Range	-40 to 125	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution eligibility for the MCR25M is determined by the following critical parameters:

Direct Equivalents must match all of the following:

Voltage - Off State: 600V
Current - On State (It RMS) Max: 25A
SCR Type: Standard Recovery
Package / Case: TO-220-3
Mounting Type: Through Hole

Similar Substitutes may have variations in:

Voltage - Off State (higher ratings acceptable for derating applications)
Gate trigger voltage and current (within design tolerance)
On-state voltage drop (Vtm)
Non-repetitive surge current ratings

The MCR25MG from Littelfuse Inc. qualifies as a direct equivalent, meeting all critical parameters while offering active product status and RoHS3 compliance. The TYN625RG from STMicroelectronics also qualifies as a direct equivalent with identical voltage and current ratings. The CS19-08HO1 from IXYS is classified as a similar substitute due to higher voltage rating (800V) and slightly different current specifications, suitable for applications requiring higher voltage derating margins.

Parameter Comparison

Parameter	MCR25M (onsemi)	MCR25MG (Littelfuse)	TYN625RG (STMicroelectronics)	CS19-08HO1 (IXYS)
Voltage - Off State	600V	600V	600V	800V
Voltage - Gate Trigger (Vgt) Max	1V	1V	1.3V	1.5V
Current - Gate Trigger (Igt) Max	30mA	30mA	40mA	28mA
Voltage - On State (Vtm) Max	1.8V	1.8V	1.6V	1.6V
Current - On State (It RMS) Max	25A	25A	25A	29A
Current - Hold (Ih) Max	40mA	40mA	50mA	50mA
Current - Off State Max	10µA	10µA	5µA	5mA
Current - Non Rep. Surge (60Hz)	300A	300A	300A	180A
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MCR25MG (Littelfuse Inc.) is the primary recommended substitute. It provides direct electrical and mechanical equivalence to the MCR25M with identical voltage and current ratings. The MCR25MG is in active production status, ensuring long-term availability and supply chain stability. RoHS3 compliance satisfies modern regulatory requirements. Packaging is available in box format with 6178 units in stock.

TYN625RG (STMicroelectronics) is an alternative direct equivalent meeting all critical electrical parameters. This part is actively produced and RoHS3 compliant. The lower off-state leakage current (5µA vs. 10µA) and improved on-state voltage drop (1.6V vs. 1.8V) provide marginal performance benefits. Supplied in tube packaging with 1505 units available.

CS19-08HO1 (IXYS) is suitable only for applications where higher voltage derating is required or beneficial. The 800V off-state rating exceeds the MCR25M specification. The 29A on-state RMS current rating provides additional current margin. However, the lower non-repetitive surge current (180A vs. 300A) and higher off-state leakage current (5mA vs. 10µA) represent trade-offs. This part is RoHS3 compliant and actively produced.

Frequently Asked Questions (FAQ)

Q: Can MCR25MG be used as a direct replacement for MCR25M?

A: Yes. MCR25MG meets all electrical and mechanical specifications of the MCR25M. Both devices are rated for 600V off-state voltage, 25A on-state RMS current, and use the TO-220-3 package. MCR25MG offers the additional advantage of active product status and RoHS3 compliance.

Q: What is the difference between direct equivalents and similar substitutes?

A: Direct equivalents (MCR25MG and TYN625RG) match all critical parameters: 600V voltage rating, 25A current rating, and TO-220-3 package. Similar substitutes (CS19-08HO1) have variations in voltage rating or current specifications but remain functionally compatible for applications with appropriate design margins.

Q: Is CS19-08HO1 compatible with MCR25M applications?

A: CS19-08HO1 is compatible for most applications but with design considerations. The higher 800V voltage rating allows operation in higher voltage circuits. The 29A current rating provides additional margin. However, the lower non-repetitive surge current (180A vs. 300A) must be evaluated against application surge requirements.

Q: Are all substitute parts RoHS compliant?

A: MCR25MG and TYN625RG are ROHS3 compliant. CS19-08HO1 is also ROHS3 compliant. The original MCR25M is RoHS non-compliant. All substitute parts meet current regulatory requirements.

Q: What packaging options are available?

A: MCR25MG is supplied in box packaging. TYN625RG and CS19-08HO1 are supplied in tube packaging. All three parts use the same TO-220-3 through-hole package format, ensuring mechanical compatibility.

Q: Which substitute offers the best long-term availability?

A: MCR25MG from Littelfuse Inc. and TYN625RG from STMicroelectronics are both actively produced by major manufacturers with established supply chains. Both offer superior long-term availability compared to the obsolete MCR25M.

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