CS220-25N Equivalent & Substitute Parts

Part Overview

The CS220-25N is an 800V 25A SCR (Silicon Controlled Rectifier) in TO-220-3 package manufactured by Central Semiconductor Corp. This thyristor is designed for standard recovery applications requiring high voltage switching capability. The part is currently listed as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Voltage - Off State	800 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 Range	-40°C to 125°C
Mounting Type	Through Hole
Package / Case	TO-220-3

Substitute Part Grouping Explanation

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

Voltage Rating: Off-state voltage must be 800V or greater
Current Rating: On-state RMS current must support 25A minimum
Gate Characteristics: Gate trigger voltage (Vgt) and current (Igt) must not exceed specified maximums
On-State Performance: Forward voltage drop (Vtm) must remain within 1.8V maximum
Package Compatibility: TO-220-3 through-hole mounting required
Recovery Type: Standard recovery SCR classification
Temperature Range: Operating range of -40°C to 125°C

The 2N6509G from Littelfuse Inc. meets all substitution criteria within these parameters.

Parameter Comparison

Parameter	CS220-25N (Central Semiconductor)	2N6509G (Littelfuse)
Voltage - Off State	800 V	800 V
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	30 mA	30 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.8 V
Current - On State (It (RMS)) (Max)	25 A	25 A
Current - Hold (Ih) (Max)	50 mA	40 mA
SCR Type	Standard Recovery	Standard Recovery
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-220-3	TO-220-3

Engineering Selection Recommendations

The 2N6509G is the qualified substitute for the obsolete CS220-25N. This part is manufactured by Littelfuse Inc., an active product with ROHS3 compliance status. The electrical specifications are identical across all critical switching parameters. The hold current (Ih) of the 2N6509G is 40mA, which is lower than the CS220-25N specification of 50mA; this represents improved performance characteristics within the substitution envelope. Both parts carry REACH Unaffected status and identical ECCN/HTSUS classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 2N6509G directly replace the CS220-25N in existing designs?

A: Yes. Both parts share identical voltage ratings (800V), gate trigger specifications (1.5V max, 30mA max), on-state voltage (1.8V max), and RMS current capacity (25A). The TO-220-3 package pinout is compatible. The lower hold current of the 2N6509G does not create a substitution barrier.

Q: What is the significance of the TO-220-3 versus TO-220AB package designation?

A: Both designations refer to the same three-lead through-hole package form factor. The TO-220AB is the supplier device package designation for the 2N6509G. Physical mounting and electrical connectivity are identical.

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

A: Obsolescence indicates the part is no longer manufactured by Central Semiconductor Corp. The 2N6509G provides functional and electrical equivalence for applications currently using the CS220-25N.

Q: Are there compliance differences between these parts?

A: No. Both parts carry identical REACH and ECCN classifications (EAR99). The 2N6509G includes ROHS3 compliance certification, which is standard for active production thyristors.

Q: What is the current availability status?

A: The 2N6509G is in active production with 1491 pieces available in stock. The CS220-25N is obsolete with limited remaining inventory.

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