CS220-25B Equivalent & Substitute Parts

Part Overview

The CS220-25B is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage with 25A on-state current capacity, manufactured by Central Semiconductor Corp in a TO-220-3 through-hole package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The obsolete status necessitates sourcing from active product lines that maintain compatible electrical and mechanical specifications.

Key Parameters

Parameter	CS220-25B
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 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)	50 mA
SCR Type	Standard Recovery
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution of the CS220-25B is determined by the following critical parameters:

Voltage Rating (Off State): Must match or exceed 200V to maintain blocking capability
Gate Trigger Characteristics: Vgt and Igt must be compatible with existing gate drive circuitry
On-State Voltage Drop (Vtm): Must not exceed 1.8V to maintain thermal and efficiency margins
Current Capacity (It (RMS)): The substitute must support the required load current
Hold Current (Ih): Must be compatible with circuit latching requirements
Package and Mounting: TO-220-3 through-hole configuration ensures mechanical and thermal interface compatibility
SCR Type: Standard Recovery classification ensures switching characteristics align with circuit timing requirements

The MCR218-4G from onsemi is identified as a manufacturer-recommended substitute based on matching voltage ratings, gate trigger parameters, on-state voltage characteristics, and identical package configuration. While the on-state current rating differs (8A vs. 25A), this represents a derating scenario applicable when the original 25A capacity exceeds circuit requirements.

Parameter Comparison

Parameter	CS220-25B	MCR218-4G
Voltage - Off State	200 V	200 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	30 mA	25 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V
Current - On State (It (RMS)) (Max)	25 A	8 A
Current - Hold (Ih) (Max)	50 mA	30 mA
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	TO-220-3	TO-220-3
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active

Engineering Selection Recommendations

The MCR218-4G is suitable as a substitute for the CS220-25B in applications where the load current does not exceed 8A RMS. The substitute maintains identical voltage ratings, gate trigger specifications, and on-state voltage characteristics, ensuring compatibility with existing gate drive and power circuit designs.

The MCR218-4G carries active product status from onsemi, providing assured long-term availability and supply chain continuity compared to the obsolete CS220-25B. Both devices comply with REACH regulations and carry EAR99 ECCN classification.

For applications requiring the full 25A capacity of the original CS220-25B, alternative 25A-rated SCRs with matching voltage and gate trigger specifications must be evaluated separately.

Frequently Asked Questions (FAQ)

Q: Can the MCR218-4G directly replace the CS220-25B in all applications?

A: The MCR218-4G is electrically compatible for gate drive and voltage blocking functions. However, substitution is limited to applications where the load current does not exceed 8A RMS. If your circuit requires the full 25A capacity, the MCR218-4G is not suitable.

Q: What are the key compatibility factors for this substitution?

A: The matching parameters are: 200V off-state voltage rating, 1.5V maximum gate trigger voltage, 1.8V maximum on-state voltage drop, identical TO-220-3 package, and standard recovery SCR type. These parameters ensure the substitute functions identically in gate drive and power switching roles.

Q: Does the lower gate trigger current (25mA vs. 30mA) affect circuit operation?

A: No. The MCR218-4G's 25mA maximum gate trigger current is lower than the CS220-25B's 30mA specification, making it easier to trigger. This represents improved performance for gate drive circuits designed for the original part.

Q: Are there thermal considerations when using the MCR218-4G instead of the CS220-25B?

A: The MCR218-4G's lower current rating (8A vs. 25A) results in reduced power dissipation in applications operating below 8A. Both devices use the same TO-220-3 package with identical thermal interface characteristics.

Q: What is the inventory status for the MCR218-4G?

A: The MCR218-4G is in active production with 10,176 pieces available in stock, ensuring reliable supply compared to the obsolete CS220-25B with limited remaining inventory.

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