CS23-08IO2 Equivalent & Substitute Parts

Part Overview

The CS23-08IO2 is an SCR (Silicon Controlled Rectifier) rated at 800V, 50A in a TO-208AA stud mount package, manufactured by IXYS. This thyristor is designed for high-voltage switching applications requiring standard recovery characteristics. The part is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring similar electrical performance.

Substiute Parts

CS23-08IO2

IXYSIn Stock: 1176CS23-08IO2 Datasheet

Current PartRFQ

CLA50E1200HB

IXYSIn Stock: 28307CLA50E1200HB Datasheet

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MCO25-12IO1

IXYSIn Stock: 807MCO25-12IO1 Datasheet

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MCO50-12IO1

IXYSIn Stock: 100265MCO50-12IO1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS23-08IO2 is determined by the following critical parameters:

• Voltage Rating: The off-state voltage must equal or exceed 800V to maintain system safety margins
• Current Rating: The RMS current capacity must support the 50A requirement
• Gate Trigger Characteristics: Vgt and Igt parameters must be compatible with existing gate drive circuits
• On-State Voltage: Vtm affects power dissipation and thermal management
• Hold Current: Ih must be compatible with circuit latching requirements
• SCR Type: Standard Recovery type is required for switching performance consistency
• Compliance: RoHS3 compliance is mandatory for modern applications

The three substitute parts (CLA50E1200HB, MCO25-12IO1, MCO50-12IO1) are grouped as follows:

Group 1 - Higher Voltage Rating (1.2kV): CLA50E1200HB and MCO-series parts offer increased voltage headroom above the original 800V specification, suitable for applications requiring enhanced overvoltage margin or operating in higher voltage systems.

Group 2 - Module Form Factor: MCO25-12IO1 and MCO50-12IO1 are thyristor modules in SOT-227-4 miniBLOC package, providing integrated solutions with different current ratings (49A and 85A respectively) compared to the discrete TO-208AA stud mount configuration.

Parameter Comparison

Engineering Selection Recommendations

CLA50E1200HB is the direct functional equivalent for applications requiring discrete SCR performance. It maintains standard recovery characteristics and offers superior voltage rating (1.2kV vs 800V), lower gate trigger voltage (1.5V vs 2.5V), and extended operating temperature range (-40°C to 150°C). The TO-247-3 through-hole package requires PCB layout modification from the original stud mount configuration. This part is actively manufactured and ROHS3 compliant.

MCO50-12IO1 provides the highest current capacity (85A RMS) among substitutes while maintaining chassis mount compatibility with the original design. The SOT-227-4 miniBLOC module format integrates the SCR with optimized thermal characteristics. Gate trigger current requirement is higher (80mA vs 50mA), requiring gate drive circuit evaluation. This part is actively manufactured with extensive inventory availability.

MCO25-12IO1 offers a mid-range current solution (49A RMS) in module form factor. It maintains the 100mA hold current specification matching the original part and provides chassis mount compatibility. Lower gate trigger current (55mA) compared to MCO50-12IO1 may reduce gate drive power requirements. This part is actively manufactured and ROHS3 compliant.

All three substitutes are actively produced, ROHS3 compliant, and rated for extended temperature operation, addressing the obsolescence of the CS23-08IO2.

Frequently Asked Questions (FAQ)

Q: Can CLA50E1200HB directly replace CS23-08IO2 in existing designs?

A: CLA50E1200HB is electrically compatible for standard recovery SCR applications. The primary design consideration is the package change from TO-208AA stud mount to TO-247-3 through-hole, requiring PCB layout modification. Gate trigger voltage is lower (1.5V vs 2.5V), which may improve gate drive efficiency but requires circuit validation.

Q: What is the difference between discrete SCR and module substitutes?

A: CLA50E1200HB is a discrete SCR in TO-247-3 package requiring individual mounting and gate drive connections. MCO25-12IO1 and MCO50-12IO1 are integrated thyristor modules in SOT-227-4 miniBLOC format, providing optimized thermal management and simplified integration for chassis mount applications. Module substitutes may require different PCB footprints and connection schemes.

Q: Which substitute should be selected for maximum current capacity?

A: MCO50-12IO1 provides the highest RMS current rating at 85A, compared to 50A for the original CS23-08IO2. This part is suitable for applications requiring increased current handling or thermal margin. Gate trigger current requirement is 80mA, which must be supported by the gate drive circuit.

Q: Are all substitutes suitable for -40°C to 125°C operation?

A: All three substitutes support extended temperature range to 150°C, exceeding the original -40°C to 125°C specification. This provides additional thermal margin for high-temperature applications.

Q: What mounting considerations apply when substituting the stud mount CS23-08IO2?

A: CLA50E1200HB uses through-hole TO-247-3 mounting, requiring PCB redesign from the original stud mount configuration. MCO25-12IO1 and MCO50-12IO1 maintain chassis mount compatibility, potentially simplifying mechanical integration if the original design used chassis mounting.

Q: Are gate drive circuits compatible across all substitutes?

A: Gate trigger voltage and current specifications differ across substitutes. CLA50E1200HB requires 1.5V (vs 2.5V original), while MCO50-12IO1 requires 1.4V. Gate trigger current ranges from 50mA to 80mA. Existing gate drive circuits must be evaluated for compatibility with the selected substitute's specifications.