CS220-10B Equivalent & Substitute Parts

Part Overview

The CS220-10B is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage and 10A on-state current in a TO-220-3 through-hole package, manufactured by Central Semiconductor Corp. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The standard recovery SCR type and through-hole mounting configuration are primary considerations for substitution compatibility.

Key Parameters

Parameter	CS220-10B
Voltage - Off State	200 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA
Voltage - On State (Vtm) (Max)	1.6 V
Current - On State (It (RMS)) (Max)	10 A
Current - Hold (Ih) (Max)	30 mA
SCR Type	Standard Recovery
Operating Temperature Range	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the CS220-10B is determined by the following critical parameters:

Voltage Rating (Off-State): 200V minimum requirement
Current Rating (On-State): Must support the application's RMS current demand
Gate Trigger Characteristics: Vgt and Igt parameters must be compatible with existing gate drive circuitry
On-State Voltage Drop: Vtm affects power dissipation and thermal performance
Hold Current: Ih determines minimum holding current for latching behavior
SCR Type: Standard Recovery classification ensures consistent switching characteristics
Package Compatibility: TO-220-3 through-hole mounting for direct PCB replacement
Operating Temperature: -40°C to 125°C range must be maintained

The MCR218-4G meets the voltage, gate trigger, hold current, SCR type, package, and temperature requirements. The primary design consideration is the reduced on-state current rating (8A versus 10A), which requires verification that the application's actual current demand does not exceed 8A RMS.

Parameter Comparison

Parameter	CS220-10B	MCR218-4G	Compatibility Notes
Manufacturer	Central Semiconductor Corp	onsemi	Different manufacturer
Voltage - Off State	200 V	200 V	Matched
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	Matched
Current - Gate Trigger (Igt) (Max)	15 mA	25 mA	MCR218-4G requires higher gate current
Voltage - On State (Vtm) (Max)	1.6 V	1.8 V	MCR218-4G has higher voltage drop
Current - On State (It (RMS)) (Max)	10 A	8 A	MCR218-4G rated lower; verify application current
Current - Hold (Ih) (Max)	30 mA	30 mA	Matched
SCR Type	Standard Recovery	Standard Recovery	Matched
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Matched
Mounting Type	Through Hole	Through Hole	Matched
Package / Case	TO-220-3	TO-220-3	Matched
Product Status	Obsolete	Active	MCR218-4G is currently in production

Engineering Selection Recommendations

The MCR218-4G is an active production substitute for the obsolete CS220-10B. Both devices share identical voltage ratings, gate trigger voltage, hold current specifications, SCR type classification, operating temperature range, and TO-220-3 package configuration, enabling direct PCB replacement without layout modifications.

Design considerations for substitution:

Current Rating Reduction: The MCR218-4G is rated for 8A on-state current versus the CS220-10B's 10A rating. Applications operating at or near 10A RMS must be re-evaluated to confirm operation within the 8A limit.
Gate Drive Current: The MCR218-4G requires up to 25mA gate trigger current compared to 15mA for the CS220-10B. Existing gate drive circuits must provide sufficient current margin.
On-State Voltage Drop: The MCR218-4G exhibits a maximum on-state voltage of 1.8V versus 1.6V for the CS220-10B, resulting in approximately 12.5% higher conduction losses. Thermal analysis should account for this increased power dissipation.
Compliance & Availability: The MCR218-4G maintains REACH compliance and EAR99 export classification consistent with the original part. Active production status ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the MCR218-4G be used as a direct drop-in replacement for the CS220-10B?

A: Yes, for applications where the on-state current does not exceed 8A RMS. The TO-220-3 package, voltage ratings, gate trigger voltage, hold current, and operating temperature range are identical. Gate drive circuits must supply up to 25mA trigger current, and thermal design must account for the higher on-state voltage drop.

Q: What is the primary limitation of the MCR218-4G as a substitute?

A: The reduced on-state current rating of 8A versus 10A is the primary design constraint. Applications requiring sustained currents above 8A RMS are not suitable for this substitute without circuit redesign or parallel device configuration.

Q: Are there package compatibility concerns?

A: No. Both the CS220-10B and MCR218-4G use the TO-220-3 through-hole package. PCB footprints, lead spacing, and mounting hardware are identical, permitting direct substitution without layout changes.

Q: How does the higher on-state voltage drop affect system performance?

A: The MCR218-4G's 1.8V maximum on-state voltage versus the CS220-10B's 1.6V results in approximately 0.2V additional voltage drop across the device. In 8A applications, this represents an additional 1.6W power dissipation. Thermal management and heat sink sizing should be verified for the specific application.

Q: Is the MCR218-4G suitable for new designs?

A: Yes. The MCR218-4G is an active production component with established supply availability, making it appropriate for both legacy system support and new product development within the specified current and voltage parameters.

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