CM300DY-12NF IGBT Power Module: Comprehensive Guide for Industrial Automation Applications

9 de enero de 2026

Historical parts record: Photos and notes below belong to this record. Confirm the offered unit’s full model, condition and available test evidence before ordering.

What is the Mitsubishi CM300DY-12NF?

The CM300DY-12NF is a Mitsubishi Electric half-bridge IGBT module in the dual in-line power package: two 1200 V, 300 A-class IGBT switches with their freewheel diodes in one black-cased module, the three main terminals on M6 studs across the top and the gate/emitter leads on the side pins. The label on every unit in this lot reads TYPE CM300DY-12NF, NO. S22DA5, MITSUBISHI ELECTRIC CORPORATION JAPAN — four modules from one lot number, refurbished to as-new condition with a 3-month warranty as recorded. All 10 photos below show these exact units.

3 min readContent reviewed 7 October 2026

Part details

CM300DY-12NF, as printed on the module label
Field	Value
Type	CM300DY-12NF (Mitsubishi Electric)
Topology	Half bridge: 2x IGBT + 2x freewheel diode
Voltage class	1200 V
Current class	300 A
Main terminals	3x stud terminals across the top face
Control leads	Gate/emitter pins on the side edges (per switch)
Package	Black moulded case on copper base with aluminium mounting flange
Label / lot	TYPE CM300DY-12NF, NO. S22DA5, Mitsubishi Electric Corporation Japan
Quantity	4 modules, one lot number
Condition	Refurbished to as-new, 3-month warranty as recorded
Shipping weight	0.5 kg each

Scroll sideways to see the full table.

Values follow the module label and the standard CM-series ordering code.

The workhorse of the drive-repair shelf

CM-series dual modules are the part most often ordered when a Mitsubishi VFD or servo amplifier dies with a bang: one module carries both switches of an inverter phase leg, so a failed leg is one part number to replace. The -12NF suffix marks the 1200 V class in Mitsubishi's NF generation — a later build than the older -12H modules it commonly substitutes for, with the same footprint and terminal layout that CM300DY panels were designed around. Wiring follows the label: the three studs are the DC-plus, output and DC-minus of the leg, and the side pins carry each switch's gate and emitter return for the driver board. The copper base and aluminium flange bolt to the amplifier heatsink, carrying the module's losses away under the mounting screws. With four units from a single S22DA5 lot, a repair shop can re-leg a whole three-phase output stage and keep a spare. KOEED lists this family widely, including the predecessor CM300DY-12H and the 24-class CM300DY-24A.