CS220-25D Equivalent & Substitute Parts

Part Overview

The CS220-25D is a Silicon Controlled Rectifier (SCR) rated for 400V off-state voltage with 25A RMS on-state current capacity, housed in a TO-220-3 through-hole package. Manufactured by Central Semiconductor Corp, this component is classified as obsolete. Due to its obsolete status and limited availability from the original manufacturer, identifying qualified substitute parts is essential for system maintenance, repair, and new design implementations where this thyristor specification is required.

Key Parameters

Parameter	Value	Unit
Voltage - Off State	400	V
Current - On State (It (RMS)) (Max)	25	A
Voltage - Gate Trigger (Vgt) (Max)	1.5	V
Current - Gate Trigger (Igt) (Max)	30	mA
Voltage - On State (Vtm) (Max)	1.8	V
Current - Hold (Ih) (Max)	50	mA
Operating Temperature Range	-40 to 125	°C
SCR Type	Standard Recovery	-
Package / Case	TO-220-3	-
Mounting Type	Through Hole	-

Substitute Part Grouping Explanation

Substitution of the CS220-25D is determined by matching the following critical electrical and mechanical parameters:

Electrical Matching Criteria:

Off-state voltage rating: 400V minimum
RMS on-state current capacity: 25A minimum
Gate trigger voltage (Vgt): 1.5V maximum
Gate trigger current (Igt): 30mA maximum
On-state voltage drop (Vtm): 1.8V maximum
Hold current (Ih): 50mA maximum
SCR type: Standard Recovery

Mechanical Matching Criteria:

Package type: TO-220-3 through-hole configuration
Operating temperature range: -40°C to 125°C minimum

The 2N6507G meets all specified electrical parameters and maintains identical mechanical compatibility through its TO-220AB package designation, which is functionally equivalent to TO-220-3 for through-hole mounting applications.

Parameter Comparison

Parameter	CS220-25D	2N6507G	Unit
Manufacturer	Central Semiconductor Corp	Littelfuse Inc.	-
Product Status	Obsolete	Active	-
Voltage - Off State	400	400	V
Voltage - Gate Trigger (Vgt) (Max)	1.5	1.5	V
Current - Gate Trigger (Igt) (Max)	30	30	mA
Voltage - On State (Vtm) (Max)	1.8	1.8	V
Current - On State (It (RMS)) (Max)	25	25	A
Current - Hold (Ih) (Max)	50	40	mA
SCR Type	Standard Recovery	Standard Recovery	-
Operating Temperature	-40 to 125	-40 to 125	°C
Package / Case	TO-220-3	TO-220-3	-
Mounting Type	Through Hole	Through Hole	-

Engineering Selection Recommendations

The 2N6507G is the qualified substitute for the obsolete CS220-25D based on the following factors:

Electrical Compatibility: All critical electrical parameters match or exceed the CS220-25D specification. The 2N6507G maintains identical voltage ratings (400V off-state), gate trigger thresholds (1.5V maximum), and on-state current capacity (25A RMS). The hold current specification of 40mA on the 2N6507G is lower than the 50mA maximum of the CS220-25D, representing improved performance characteristics.

Mechanical Compatibility: Both components utilize TO-220-3 through-hole packaging, ensuring direct pin-compatible mounting on existing PCB layouts without modification.

Product Status and Availability: The 2N6507G is manufactured by Littelfuse Inc. and maintains active production status with substantial inventory availability (12,700 pieces), providing supply chain reliability for both immediate replacement and future procurement.

Compliance: The 2N6507G is RoHS3 compliant and carries REACH Unaffected status, meeting modern regulatory requirements for electronic component procurement.

Frequently Asked Questions (FAQ)

Q: Can the 2N6507G directly replace the CS220-25D in existing applications?

A: Yes. The 2N6507G is electrically and mechanically compatible with the CS220-25D. Both components share identical voltage ratings, gate trigger specifications, on-state current capacity, and TO-220-3 through-hole packaging. No circuit modifications or PCB redesign is required.

Q: What is the difference between TO-220-3 and TO-220AB packaging?

A: TO-220AB is a variant designation of the TO-220-3 package standard. Both refer to the same three-lead through-hole configuration with identical pin spacing and mounting requirements. The designations are functionally equivalent for component selection purposes.

Q: Are there any performance differences between the CS220-25D and 2N6507G?

A: The electrical performance is equivalent across all specified parameters. The 2N6507G exhibits a lower hold current specification (40mA versus 50mA maximum), which represents improved gate control characteristics and does not negatively impact circuit operation.

Q: What certifications does the 2N6507G carry?

A: The 2N6507G is RoHS3 compliant and REACH Unaffected. These certifications confirm compliance with current environmental and hazardous substance regulations applicable to electronic components.

Q: Why is the CS220-25D listed as obsolete?

A: Obsolete status indicates that the original manufacturer (Central Semiconductor Corp) has discontinued production. The 2N6507G provides a direct functional replacement from an active manufacturer, ensuring long-term supply availability.

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