CS220-35N Equivalent & Substitute Parts

Part Overview

The CS220-35N is a Silicon Controlled Rectifier (SCR) rated for 800V off-state voltage with 35A on-state current capacity, manufactured by Central Semiconductor Corp in a TO-220-3 through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 125°C and features standard recovery characteristics typical of general-purpose thyristor applications.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	800	V
Current - On State (It (RMS)) (Max)	35	A
Voltage - Gate Trigger (Vgt) (Max)	1	V
Current - Gate Trigger (Igt) (Max)	30	mA
Voltage - On State (Vtm) (Max)	2.2	V
Current - Hold (Ih) (Max)	40	mA
SCR Type	Standard Recovery	—
Operating Temperature	-40 to 125	°C
Mounting Type	Through Hole	—
Package / Case	TO-220-3	—

Substitute Part Grouping Explanation

Substitution of the CS220-35N is determined by the following critical electrical and mechanical parameters:

Off-State Voltage Rating: 800V minimum
On-State Current Capacity: Must support the application's required current; 25A or higher acceptable for designs tolerating reduced current margin
Gate Trigger Characteristics: Vgt ≤ 1V and Igt ≤ 30mA for gate drive compatibility
On-State Voltage Drop: Vtm ≤ 2.2V to maintain thermal performance
Hold Current: Ih ≤ 40mA for reliable latching behavior
SCR Type: Standard Recovery classification
Package: TO-220-3 through-hole configuration for mechanical and thermal compatibility
Temperature Range: -40°C to 125°C operational envelope

The MCR25NG from Littelfuse Inc. qualifies as a direct substitute. Although its on-state current rating is 25A (compared to 35A), it meets all other critical parameters and maintains the same voltage class, gate trigger specifications, and thermal characteristics. The MCR25NG is an active product with full compliance certifications, making it suitable for applications where the 25A current capacity is sufficient.

Parameter Comparison

Parameter	CS220-35N (Main Part)	MCR25NG (Substitute)	Unit
Manufacturer	Central Semiconductor Corp	Littelfuse Inc.	—
Product Status	Obsolete	Active	—
Voltage - Off State	800	800	V
Current - On State (It (RMS)) (Max)	35	25	A
Voltage - Gate Trigger (Vgt) (Max)	1	1	V
Current - Gate Trigger (Igt) (Max)	30	30	mA
Voltage - On State (Vtm) (Max)	2.2	1.8	V
Current - Hold (Ih) (Max)	40	40	mA
SCR Type	Standard Recovery	Standard Recovery	—
Operating Temperature	-40 to 125	-40 to 125	°C
Mounting Type	Through Hole	Through Hole	—
Package / Case	TO-220-3	TO-220-3	—
RoHS Status	—	ROHS3 Compliant	—

Engineering Selection Recommendations

The MCR25NG is the qualified substitute for the obsolete CS220-35N. Selection criteria are based on the following factors:

Product Status: The CS220-35N is obsolete, creating supply chain risk. The MCR25NG is an active product with confirmed inventory availability (3410 pcs in stock), ensuring long-term procurement viability.

Compliance & Certifications: The MCR25NG carries ROHS3 compliance and maintains REACH Unaffected status, meeting modern regulatory requirements. Both parts share identical ECCN (EAR99) and HTSUS (8541.30.0080) classifications.

Electrical Compatibility: The MCR25NG delivers equivalent gate trigger performance (Vgt = 1V, Igt = 30mA) and improved on-state voltage characteristics (Vtm = 1.8V vs. 2.2V), resulting in lower thermal dissipation. The 25A on-state current rating is suitable for applications where load current does not exceed this threshold.

Thermal & Mechanical Fit: Both devices operate across -40°C to 125°C and use identical TO-220-3 through-hole packaging, ensuring direct mechanical and thermal compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the MCR25NG directly replace the CS220-35N in all applications?

A: Direct replacement is possible only in applications where the load current does not exceed 25A RMS. If the original design requires the full 35A capacity of the CS220-35N, the MCR25NG will not be suitable. Verify your circuit's actual current requirements before substitution.

Q: What is the difference in on-state voltage between these parts?

A: The MCR25NG has a lower on-state voltage drop (Vtm = 1.8V maximum) compared to the CS220-35N (Vtm = 2.2V maximum). This 0.4V reduction decreases power dissipation and heat generation, which is beneficial for thermal management.

Q: Are the gate trigger specifications identical?

A: Yes. Both parts specify Vgt (Max) = 1V and Igt (Max) = 30mA, ensuring gate drive circuits designed for the CS220-35N will function identically with the MCR25NG without modification.

Q: Is the TO-220-3 package identical between both parts?

A: Both parts use TO-220-3 through-hole packaging. The MCR25NG is supplied in TO-220AB variant designation, which is mechanically and electrically equivalent to the standard TO-220-3 configuration. No PCB layout changes are required.

Q: What compliance certifications does the MCR25NG carry?

A: The MCR25NG is ROHS3 compliant and REACH Unaffected. It maintains the same ECCN (EAR99) export classification as the CS220-35N, simplifying regulatory documentation for design transitions.

Q: Why is the CS220-35N obsolete?

A: The CS220-35N is classified as obsolete by Central Semiconductor Corp. The MCR25NG from Littelfuse Inc. is an active product with full manufacturer support and confirmed long-term availability, making it the recommended path for new designs and production continuity.

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