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Press-Pack IEGTs (PPIs)

Characteristics of PPIs

Electrical connections using pressure

Multiple IEGT chips are placed in an array on the same plane, and individual IEGT chips are uniformly pressed from both sides using a molybdenum plate. The collector and emitter electrodes of each IEGT chip are brought into contact with the corresponding copper electrodes of the press pack enclosure via the molybdenum plate by applying mechanical pressure. This not only makes electrical connections and but also allows heat dissipation.

High reliability due to hermetic sealing

Inert gas is hermetically sealed inside the press pack in order to prevent electrodes from being degraded due to oxidation. Thus, PPIs provide high thermal reliability.

Outstanding parallel operation technology

The wiring inside the gate terminal plate is designed to switch all the parallel IEGT chips simultaneously so that they will not interfere with each other and oscillate when switching.

Rupture-resistant package structure

IEGT chips are positioned on a resin frame to make them less prone to rupture even if a chip is melt and destroyed during switching.

PPI Structure

Cross-Sectional View Of a PPI

PPI Installation Example

In the example shown at right, three series-connected PPIs are vertically stacked.

The PPI are placed between cooling fins, and pressure is applied from above and below to hold them firmly. An elaborate setup is necessary to ensure that pressure is uniformly applied across the PPIs. The spring helps reduce thermal contraction to keep a constant pressure.

PPI Installation Example

Application Examples

Converters for High-Voltage Direct-Current (HVDC) Transmission

HVDC transmission is utilized to efficiently transmit renewable energy captured in remote places, for example, windmills on the sea, to the sites where energy is used. The generated AC voltage is converted to DC voltage and transmitted ashore over long distances or via submarine power cables. At the receiving end, the DC voltage is converted back into AC voltage to feed electricity consumers. PPIs are used for high-voltage converters.

Submarine Power Transmission System

Static VAR Compensators (SVCs)

SVCs are electrical equipments for improving electricity quality (e.g., power factor correction) on transmission networks. PPIs are utilized as high-voltage, high-current power devices for active SVC applications such as static VAR generators (SVGs) and static synchronous compensators (STATCOMs).

SVG Inverter Circuit

Medium-Voltage Inverters

PPIs, which allow series connection and double-sided cooling, are ideal for high-capacity inverter applications.

Inverter Circuit

PPI Product Lineup

Part Number Package Absolute Maximum Ratings VCE(sat)(V) VF(V)






Max Test Condition
@IC (A) / VGE(V)
Test Condition
@IF (A) / VGE (V)
ST1200FXF24 PPI85B 3300 1200 125 4.2 1200 / 15 3.8 1200 / 0
ST750GXH24 PPI85B 4500 750 125 4.0 750 / 15 4.2 750 / 0
ST1200GXH24A PPI85B 4500 1200 125 3.8 1200 / 15
ST1500GXH24 PPI125A2 4500 1500 125 4.0 1500 / 15 4.2 1500 / 0
ST2100GXH24A PPI125A2 4500 2100 125 4.0 2100 / 15
ST3000GXH31A* PPI125A2 4500 3000 150 3000 / 15

*Under development


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