CS220-25PB Equivalent & Substitute Parts

Part Overview

The CS220-25PB is a 1 kV, 25 A Silicon Controlled Rectifier (SCR) manufactured by Central Semiconductor Corp in a Through Hole TO-220-3 package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part operates across a temperature range of -40°C to 125°C and features standard recovery characteristics typical of general-purpose thyristor applications.

Key Parameters

Parameter	Value
Voltage - Off State	1 kV
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
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 CS220-25PB is determined by the following critical parameters:

Voltage Rating (Off State): The substitute must meet or exceed 1 kV blocking voltage capability
Current Rating (RMS): The substitute must support 25 A RMS on-state current
Gate Trigger Characteristics: Vgt and Igt must remain within compatible ranges to ensure reliable gate drive circuit operation
On-State Voltage Drop: Vtm must be acceptable for thermal and efficiency considerations
Hold Current: Ih must be compatible with circuit latching requirements
SCR Type: Standard Recovery classification ensures compatible switching behavior
Package Compatibility: TO-220-3 Through Hole mounting is required for direct mechanical and electrical substitution
Temperature Range: Operating range of -40°C to 125°C must be maintained

The TYN1225RG from STMicroelectronics qualifies as a substitute based on these parameters while offering improved voltage rating (1.2 kV) and active product status.

Parameter Comparison

Parameter	CS220-25PB	TYN1225RG
Manufacturer	Central Semiconductor Corp	STMicroelectronics
Voltage - Off State	1 kV	1.2 kV
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	30 mA	40 mA
Voltage - On State (Vtm) (Max)	1.8 V	1.6 V
Current - On State (It (RMS)) (Max)	25 A	25 A
Current - Hold (Ih) (Max)	50 mA	50 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
Product Status	Obsolete	Active

Engineering Selection Recommendations

The TYN1225RG is suitable for direct substitution of the CS220-25PB based on the following factors:

Electrical Compatibility: The TYN1225RG maintains identical RMS current rating (25 A) and gate trigger voltage (1.5 V), ensuring circuit operation without modification
Improved Voltage Margin: The 1.2 kV off-state voltage rating provides 200 V additional blocking capability compared to the original 1 kV specification, enhancing system reliability
Reduced On-State Voltage: The TYN1225RG exhibits lower on-state voltage drop (1.6 V vs. 1.8 V), resulting in improved thermal performance
Active Product Status: The TYN1225RG is actively manufactured and widely available, eliminating supply chain constraints associated with the obsolete CS220-25PB
Compliance: Both components share identical operating temperature range, REACH status, and ECCN classification, ensuring regulatory continuity
Package Compatibility: Identical TO-220-3 Through Hole packaging permits direct mechanical substitution without PCB redesign

Frequently Asked Questions (FAQ)

Q: Can the TYN1225RG directly replace the CS220-25PB without circuit modifications?

A: Yes. The TYN1225RG maintains electrical compatibility across all critical parameters: gate trigger voltage (1.5 V), RMS current rating (25 A), hold current (50 mA), and operating temperature range (-40°C to 125°C). The identical TO-220-3 package permits direct mechanical substitution.

Q: What is the significance of the higher voltage rating (1.2 kV vs. 1 kV)?

A: The increased off-state voltage rating of the TYN1225RG provides additional blocking capability without affecting circuit operation. This represents a design margin improvement and does not require circuit adjustment.

Q: Are there differences in gate drive requirements between these parts?

A: Gate trigger voltage (Vgt) is identical at 1.5 V maximum. The TYN1225RG specifies a slightly higher gate trigger current (Igt) of 40 mA compared to 30 mA for the CS220-25PB. Existing gate drive circuits designed for the CS220-25PB will operate the TYN1225RG reliably.

Q: How do the on-state voltage characteristics compare?

A: The TYN1225RG exhibits lower on-state voltage drop (1.6 V vs. 1.8 V), resulting in reduced power dissipation and improved thermal efficiency in the application.

Q: Is the TO-220-3 package identical between both parts?

A: Yes. Both components use the TO-220-3 Through Hole package with identical pin configuration and mechanical dimensions, permitting direct PCB substitution.

Q: What is the availability status of each part?

A: The CS220-25PB is obsolete with limited remaining inventory. The TYN1225RG is actively manufactured by STMicroelectronics with substantial stock availability, ensuring long-term supply continuity.

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