IXYS / LITTELFUSE – MDC56-06io1B – Thyristor SCR Power Module – 600V 60A – Reclaimed Part

IXYS / Littelfuse — MDC56-06io1B Thyristor SCR Power Module

What it is

The IXYS / Littelfuse MDC56-06io1B is a compact 600 V, 60 A dual thyristor (SCR) power module designed for industrial phase-control and AC power-switching applications. It combines two phase-control thyristors in an isolated TO-240AA power package, making it well suited for controlled rectifiers, motor soft starters, AC voltage regulators, industrial heating controls, and UPS input stages.

The module provides 100 A RMS on-state current capability along with short-duration surge capability up to approximately 1.5 kA at 50 Hz and 1.6 kA at 60 Hz. Its direct-copper-bonded ceramic construction electrically isolates the semiconductor circuit from the mounting base while providing an efficient thermal path to the heatsink.

The io1B version incorporates dedicated gate and cathode control connections and is particularly useful when servicing legacy industrial equipment where the original electrical configuration, mounting footprint, and control-terminal arrangement need to be retained.

At-a-Glance

• Manufacturer: IXYS / Littelfuse
• Part Number: MDC56-06io1B
• Voltage / Current: 600 V / 60 A I_T(AV) per arm @ 85 °C
• RMS On-State Current: 100 A
• Topology: Dual phase-control thyristor / SCR module
• Surge Current: Up to 1.5 kA at 50 Hz / 1.6 kA at 60 Hz
• Isolation: 3.0 kV RMS / 1 minute
• Mounting: Screw-mount with isolated DCB ceramic baseplate
• Package: JEDEC TO-240AA
• Use Cases: UPS input stages; soft starters; controlled rectifiers; AC regulators; industrial power controls
• Condition: Reclaimed Part

Features

• 600 V blocking capability — Designed for industrial AC switching and phase-control circuits.
• High surge strength — I_TSM up to 1.5 kA for a 10 ms 50 Hz half-cycle and 1.6 kA for an 8.3 ms 60 Hz half-cycle.
• Rugged dv/dt capability — Approximately 1000 V/µs for demanding switching environments.
• High di/dt capability — Up to approximately 150 A/µs repetitive and 500 A/µs non-repetitive under specified conditions.
• Low on-state losses — V_T0 approximately 0.85 V with approximately 3.7 mΩ slope resistance.
• High electrical isolation — 3.0 kV RMS for 1 minute and 3.6 kV RMS for 1 second between terminals and baseplate.
• DCB ceramic construction — Direct-copper-bonded Al₂O₃ provides electrical isolation with efficient heat transfer.
• Compact installation — TO-240AA package requires only two mounting screws and uses convenient screw-type power terminals.
• Legacy equipment support — Suitable for servicing industrial equipment designed around this IXYS module family.

Technical Specifications

Compatibility / Representative Uses