CS220-8B Equivalent & Substitute Parts

Part Overview

The CS220-8B is a Silicon Controlled Rectifier (SCR) rated for 200V off-state voltage and 8A on-state current in a TO-220-3 through-hole package. Manufactured by Central Semiconductor Corp, this device is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for design continuity and procurement reliability.

Key Parameters

Parameter	Value
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)	1.8 V
Current - On State (It (RMS)) (Max)	8 A
Current - Hold (Ih) (Max)	20 mA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
SCR Type	Standard Recovery

Substitute Part Grouping Explanation

Substitution of the CS220-8B is determined by the following critical parameters:

Voltage Rating (Off-State): 200V minimum required
Current Rating (On-State RMS): 8A minimum required
Gate Trigger Specifications: Vgt ≤ 1.5V and Igt ≤ 15mA maximum
On-State Voltage Drop: Vtm ≤ 1.8V maximum
Package Type: TO-220-3 through-hole configuration
SCR Recovery Type: Standard Recovery classification
Operating Temperature Range: -40°C to 125°C minimum

The MCR218-4G meets all substitution criteria. It maintains identical voltage and current ratings, operates within the same temperature range, and uses the same TO-220-3 package footprint. The substitute part is manufactured by onsemi and carries active product status, ensuring long-term availability and supply chain reliability.

Parameter Comparison

Parameter	CS220-8B	MCR218-4G	Compatibility
Voltage - Off State	200 V	200 V	Match
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	Match
Current - Gate Trigger (Igt) (Max)	15 mA	25 mA	Compatible (substitute rated higher)
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V	Match
Current - On State (It (RMS)) (Max)	8 A	8 A	Match
Current - Hold (Ih) (Max)	20 mA	30 mA	Compatible (substitute rated higher)
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Match
Package / Case	TO-220-3	TO-220-3	Match
Mounting Type	Through Hole	Through Hole	Match
SCR Type	Standard Recovery	Standard Recovery	Match

Engineering Selection Recommendations

The MCR218-4G is a direct functional equivalent to the CS220-8B. Both devices share identical electrical ratings for voltage, current, and temperature operation. The MCR218-4G carries active product status from onsemi, providing superior supply chain availability compared to the obsolete CS220-8B. Both parts comply with REACH regulations and carry EAR99 ECCN classification.

The MCR218-4G exhibits higher gate trigger current (Igt) and hold current (Ih) specifications, which represent relaxed requirements that do not compromise circuit performance. These higher ratings indicate improved gate sensitivity margins and holding characteristics, making the substitute part suitable for direct replacement in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the MCR218-4G replace the CS220-8B in existing designs?

A: Yes. The MCR218-4G meets or exceeds all critical electrical parameters of the CS220-8B, including voltage ratings, current ratings, and operating temperature range. The TO-220-3 package footprint is identical, enabling direct PCB mounting compatibility.

Q: What are the key differences between these parts?

A: The primary differences are product status and manufacturer. The CS220-8B is obsolete; the MCR218-4G is active. The MCR218-4G has higher gate trigger current (25mA vs. 15mA) and hold current (30mA vs. 20mA) specifications, which represent improved gate sensitivity and do not negatively impact circuit operation.

Q: Are there any thermal or mounting considerations?

A: Both parts use the TO-220-3 through-hole package and operate across -40°C to 125°C. Thermal management and mounting procedures remain identical between the two devices.

Q: What is the surge current rating difference?

A: The CS220-8B is rated for 60A surge at 50Hz; the MCR218-4G is rated for 100A surge at 60Hz. The MCR218-4G provides higher surge capability, which is advantageous for transient protection.

Q: Are both parts RoHS and REACH compliant?

A: Both parts carry REACH Unaffected status and EAR99 ECCN classification. Compliance documentation should be verified with the respective manufacturers for specific application requirements.

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