CS23-16IO2 Equivalent & Substitute Parts

Part Overview

The CS23-16IO2 is a 1.6 kV, 50 A SCR (Silicon Controlled Rectifier) manufactured by IXYS in a TO-208AA (TO-48) stud mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The part operates across a temperature range of -40°C to 125°C and is suitable for high-voltage switching applications requiring standard recovery characteristics.

Key Parameters

Parameter	Value
Voltage - Off State	1.6 kV
Current - On State (It (RMS)) (Max)	50 A
Voltage - On State (Vtm) (Max)	1.8 V
Voltage - Gate Trigger (Vgt) (Max)	2.5 V
Current - Gate Trigger (Igt) (Max)	50 mA
Current - Hold (Ih) (Max)	100 mA
SCR Type	Standard Recovery
Operating Temperature	-40°C ~ 125°C
Mounting Type	Chassis, Stud Mount
Package / Case	TO-208AA (TO-48)

Substitute Part Grouping Explanation

Substitution for the CS23-16IO2 is determined by the following critical parameters:

Voltage Rating: All substitutes must maintain 1.6 kV off-state voltage capability
Current Capacity: RMS current rating must meet or exceed 50 A
SCR Type: Standard Recovery characteristic required
Gate Trigger Parameters: Vgt and Igt must be compatible with existing gate drive circuits
Operating Temperature Range: Must support the application's thermal requirements
Mounting Configuration: Package type determines mechanical and thermal interface compatibility

The substitute parts are grouped into two categories based on package type: discrete TO-247 package (CMA50E1600HB) and modular SOT-227-4 chassis mount packages (MCO25-16IO1, MCO50-16IO1).

Parameter Comparison

Parameter	CS23-16IO2	CMA50E1600HB	MCO25-16IO1	MCO50-16IO1
Voltage - Off State	1.6 kV	1.6 kV	1.6 kV	1.6 kV
Current - On State (It (RMS)) (Max)	50 A	79 A	49 A	85 A
Voltage - On State (Vtm) (Max)	1.8 V	1.3 V	Not specified	Not specified
Voltage - Gate Trigger (Vgt) (Max)	2.5 V	1.5 V	1.5 V	1.4 V
Current - Gate Trigger (Igt) (Max)	50 mA	50 mA	55 mA	80 mA
Current - Hold (Ih) (Max)	100 mA	100 mA	100 mA	100 mA
SCR Type	Standard Recovery	Standard Recovery	Standard Recovery	Standard Recovery
Operating Temperature	-40°C ~ 125°C	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 150°C (TJ)
Mounting Type	Chassis, Stud Mount	Through Hole	Chassis Mount	Chassis Mount
Package / Case	TO-208AA (TO-48)	TO-247-3	SOT-227-4, miniBLOC	SOT-227-4, miniBLOC

Engineering Selection Recommendations

CMA50E1600HB: This discrete SCR offers higher RMS current capacity (79 A) and improved on-state voltage performance (1.3 V vs. 1.8 V). It is ROHS3 compliant and maintains active product status. The TO-247 package provides a through-hole mounting alternative suitable for applications where stud mount conversion is feasible. Lower gate trigger voltage (1.5 V) requires verification of gate drive circuit compatibility.

MCO25-16IO1: This modular thyristor package provides 49 A RMS current capacity, closely matching the original 50 A specification. It maintains chassis mount configuration and is ROHS3 compliant with active product status. Gate trigger parameters (Vgt 1.5 V, Igt 55 mA) are within acceptable ranges for most applications. Extended operating temperature to 150°C provides thermal margin.

MCO50-16IO1: This modular thyristor package delivers 85 A RMS current capacity with the highest surge current rating (800 A at 60 Hz). It is ROHS3 compliant and maintains active product status. The SOT-227-4 chassis mount package preserves mechanical compatibility. Higher gate trigger current (80 mA) must be evaluated against existing gate drive capabilities.

Frequently Asked Questions (FAQ)

Q: Can CMA50E1600HB replace CS23-16IO2 in existing designs? A: CMA50E1600HB meets the 1.6 kV voltage and 50 A current requirements. However, the TO-247 through-hole package differs from the TO-208AA stud mount, requiring mechanical redesign. Lower gate trigger voltage (1.5 V vs. 2.5 V) must be verified for compatibility with existing gate drive circuits.

Q: What is the difference between MCO25-16IO1 and MCO50-16IO1? A: Both are modular SCR packages in SOT-227-4 chassis mount configuration. MCO50-16IO1 provides higher current capacity (85 A vs. 49 A RMS) and higher surge current rating (800 A vs. 400 A at 60 Hz). MCO25-16IO1 more closely matches the original 50 A specification with lower gate trigger current requirements (55 mA vs. 80 mA).

Q: Are all substitute parts ROHS3 compliant? A: CMA50E1600HB, MCO25-16IO1, and MCO50-16IO1 are all ROHS3 compliant. The original CS23-16IO2 does not specify RoHS status.

Q: What mounting considerations apply to these substitutes? A: CS23-16IO2 uses stud mount TO-208AA package. CMA50E1600HB requires through-hole PCB mounting in TO-247 package. MCO25-16IO1 and MCO50-16IO1 use chassis mount SOT-227-4 packages, maintaining stud mount compatibility with appropriate mechanical interfaces.

Q: Do gate trigger parameters affect circuit design? A: Yes. CS23-16IO2 specifies Vgt max of 2.5 V. All substitutes have lower Vgt values (1.3–1.5 V), requiring gate drive circuits capable of reliable triggering at these lower thresholds. Gate trigger current (Igt) also varies: verify that existing gate drive sources can supply the required current for each substitute.

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