MCD44-18IO1B

Overview

The MCD44-18IO1B is a Silicon Controlled Rectifier (SCR) module manufactured by IXYS, belonging to the MCC/MCD series of high-power discrete semiconductor devices. It features a single element configuration housed in an isolated TO-240AA flange mount package with five terminals. The device is rated for a repetitive peak off-state voltage of 1800V and an RMS on-state current of 44A. Key electrical parameters include a maximum DC gate trigger current of 100 mA and a maximum DC gate trigger voltage of 1.6 V. The module supports a non-repetitive peak on-state current of 1240 A and operates at a maximum junction temperature of 125 °C. It complies with RoHS standards and carries UL recognition.

Feature Summary

• Integrated built-in diode configuration within a single SCR element structure
• Electrically isolated flange mount design for secure thermal management
• High surge current capability suitable for demanding power switching applications

Applications

• Industrial motor drives and variable frequency drives
• High-power rectification circuits in energy conversion systems
• Welding equipment and heavy-duty power supplies

Procurement Notes

Verify the specific suffix 'IO1B' against official IXYS documentation to confirm pinout compatibility and exact voltage ratings, as variations exist within the MCC/MCD family. Ensure the supplier provides traceable origin certificates matching Littelfuse/IXYS manufacturing records. Confirm RoHS compliance status directly from the manufacturer's latest datasheet revision rather than relying solely on distributor listings.

Selection Notes

Select this component based on the required 1800V blocking voltage and 44A continuous current handling capacity. Evaluate the thermal resistance characteristics of the TO-240AA package against your heatsink design to maintain junction temperatures below 125 °C. Consider the gate trigger requirements of 100 mA and 1.6 V when designing the control circuitry interface.

Part Context

This part belongs to the IXYS MCC/MCD series of silicon controlled rectifiers, designed for high-power industrial applications. The series offers various voltage and current ratings packaged in robust TO-240AA flange mounts. These modules are engineered for reliability in harsh environments, providing isolated mounting options for efficient heat dissipation and electrical safety in medium to high-power electronic systems.

Replacement Considerations

Direct cross-compatibility should be verified with other IXYS parts in the MCC/MCD series sharing identical pinouts and electrical ratings. Compare thermal impedance and mechanical dimensions against alternative manufacturers' TO-240AA SCRs. No official substitute part numbers are publicly confirmed for this specific model.