CS220-8D Equivalent & Substitute Parts

Part Overview

The CS220-8D is a 400V 8A standard recovery SCR (silicon-controlled rectifier) in TO-220-3 through-hole packaging manufactured by Central Semiconductor Corp. This thyristor is designed for general-purpose AC switching and control applications requiring moderate voltage and current ratings. The part is currently obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Voltage - Off State	400 V
Current - On State (It (RMS)) (Max)	8 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	15 mA
Voltage - On State (Vtm) (Max)	1.8 V
Current - Hold (Ih) (Max)	20 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 CS220-8D is determined by the following critical parameters:

Voltage Rating (Off State): 400 V minimum required
Current Rating (RMS): 8 A minimum required
Gate Trigger Specifications: Vgt ≤ 1.5 V and Igt ≤ 15 mA
SCR Type: Standard Recovery classification
Package: TO-220-3 through-hole configuration
Operating Temperature: -40°C to 125°C range

The S4008RTP from Littelfuse Inc. meets all substitution criteria. It maintains identical voltage and current ratings, gate trigger parameters within specification, and operates across the same temperature range in the same package configuration.

Parameter Comparison

Parameter	CS220-8D (Central Semiconductor)	S4008RTP (Littelfuse)	Match Status
Voltage - Off State	400 V	400 V	Equivalent
Current - On State (It (RMS)) (Max)	8 A	8 A	Equivalent
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	Equivalent
Current - Gate Trigger (Igt) (Max)	15 mA	15 mA	Equivalent
Voltage - On State (Vtm) (Max)	1.8 V	1.6 V	Compatible (S4008RTP lower)
Current - Hold (Ih) (Max)	20 mA	30 mA	Compatible (S4008RTP higher)
SCR Type	Standard Recovery	Standard Recovery	Equivalent
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Equivalent
Package / Case	TO-220-3	TO-220-3	Equivalent
Product Status	Obsolete	Active	Substitute is current production

Engineering Selection Recommendations

The S4008RTP is the direct equivalent substitute for the CS220-8D. Selection is based on the following factors:

Electrical Compatibility: All critical electrical parameters match or exceed the original specification. The S4008RTP exhibits lower on-state voltage (1.6 V vs. 1.8 V maximum), which represents improved performance characteristics. The higher hold current (30 mA vs. 20 mA) remains within acceptable design margins for standard recovery SCR applications.

Product Status: The S4008RTP is in active production status, ensuring long-term availability and supply chain continuity. The CS220-8D obsolete status necessitates substitution for new designs and ongoing production requirements.

Compliance & Certification: The S4008RTP carries RoHS3 compliance certification, meeting current environmental and regulatory standards. Both parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99).

Package Compatibility: Both devices utilize TO-220-3 through-hole packaging, ensuring direct mechanical and electrical compatibility with existing PCB layouts and thermal management solutions.

Frequently Asked Questions (FAQ)

Q: Can the S4008RTP directly replace the CS220-8D in existing designs?

A: Yes. The S4008RTP meets all electrical and mechanical requirements for direct substitution. Pin configuration, package dimensions, and electrical characteristics are compatible with designs originally specified for the CS220-8D.

Q: What is the significance of the lower on-state voltage in the S4008RTP?

A: The S4008RTP maximum on-state voltage of 1.6 V compared to the CS220-8D maximum of 1.8 V indicates improved conduction characteristics. This results in lower power dissipation during operation, which is beneficial for thermal management and overall circuit efficiency.

Q: Are there any thermal management differences between these parts?

A: Both devices are rated for the same operating temperature range (-40°C to 125°C) and use identical TO-220-3 packaging. Thermal performance depends on PCB layout, heatsinking, and application-specific current profiles rather than inherent device differences.

Q: Why is the hold current specification different between the two parts?

A: The S4008RTP hold current maximum of 30 mA exceeds the CS220-8D specification of 20 mA. This difference does not affect substitution compatibility, as hold current requirements are application-dependent and typically well below these maximum ratings in standard switching circuits.

Q: What certifications should I verify for compliance requirements?

A: The S4008RTP carries RoHS3 compliance certification. If your application requires specific environmental or regulatory certifications beyond RoHS3, consult the detailed datasheet and compliance documentation for both the original and substitute parts.

Q: Is the TO-220AB-R package variant of the S4008RTP compatible with TO-220-3 footprints?

A: The S4008RTP is supplied in TO-220AB-R packaging, which is mechanically and electrically compatible with standard TO-220-3 PCB layouts. The AB-R designation indicates a specific lead configuration variant within the TO-220 family that maintains footprint compatibility.

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