CS220-35M Equivalent & Substitute Parts

Part Overview

The CS220-35M is a Silicon Controlled Rectifier (SCR) rated for 600V 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.

Substiute Parts

CS220-35M

Central Semiconductor CorpIn Stock: 1207CS220-35M Datasheet

Current PartRFQ

MCR25MG

Littelfuse Inc.In Stock: 6259MCR25MG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS220-35M is determined by the following critical parameters:

• Voltage Rating (Off State): Must equal 600V
• SCR Type: Must be Standard Recovery
• Package / Case: Must be TO-220-3 compatible
• Operating Temperature Range: Must support -40°C to 125°C
• Gate Trigger Parameters: Vgt (Max) 1V and Igt (Max) 30mA
• Current - Hold (Ih): Must support 40mA maximum

The MCR25MG from Littelfuse Inc. meets these substitution criteria. While the on-state current rating is reduced from 35A to 25A, all other electrical and mechanical parameters align with the CS220-35M specification envelope, making it suitable for applications where the lower current capacity is acceptable.

Parameter Comparison

Engineering Selection Recommendations

The MCR25MG is an active product from Littelfuse Inc. with ROHS3 compliance and REACH unaffected status, providing long-term supply assurance compared to the obsolete CS220-35M. The MCR25MG exhibits improved on-state voltage performance (1.8V maximum versus 2.2V), resulting in lower conduction losses during operation.

Selection of the MCR25MG requires verification that the application circuit can operate within the reduced 25A on-state current rating. For applications requiring the full 35A capacity of the original CS220-35M, alternative 35A-rated 600V SCR devices in TO-220-3 packaging must be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the MCR25MG directly replace the CS220-35M in all applications?

A: Direct replacement is possible only in applications where the on-state current requirement does not exceed 25A RMS. The MCR25MG maintains identical voltage ratings, gate trigger parameters, and thermal operating range. Circuit redesign or component derating may be necessary for applications originally designed for the full 35A capacity.

Q: What are the key differences between these two SCR devices?

A: The primary difference is the on-state current rating: CS220-35M supports 35A while MCR25MG supports 25A. The MCR25MG provides superior on-state voltage performance (1.8V vs 2.2V). Both devices share identical 600V off-state voltage, gate trigger specifications, and TO-220-3 packaging.

Q: Are there package compatibility concerns?

A: Both devices use TO-220-3 through-hole packaging. The MCR25MG is supplied in TO-220AB variant, which is mechanically and electrically compatible with standard TO-220-3 footprints. No PCB layout modifications are required.

Q: What is the product status difference?

A: The CS220-35M is obsolete with no ongoing manufacturing. The MCR25MG is an active product with current production and long-term availability, making it the preferred choice for new designs and production continuity.

Q: How do the thermal characteristics compare?

A: Both devices operate across the identical temperature range of -40°C to 125°C. The MCR25MG's lower on-state voltage generates less heat during conduction, potentially improving thermal performance in thermally constrained applications.