Magnachip to Offer Ultra High Voltage 700V BCD Technology for Smartgrid & Green Energy Applications

SEOUL, South Korea, August 22, 2011 — MagnaChip Semiconductor Corporation (“MagnaChip
Semiconductor”) (NYSE: MX), a Korea-based designer and manufacturer of analog and mixed-signal
semiconductor products, announced that it now offers ultra high voltage 700V BCD (Bipolar
CMOS-DMOS) technology targeting smartgrid and green energy applications such as AC-DC adaptors and LED lighting to meet the specialized needs of foundry customers.

The new ultra high voltage 700V BCD technology features lower conduction and switching loss by
integrating low voltage CMOS (5.5V), medium voltage (30V), and ultra high voltage (700V) in a single
process to meet the requirements of AC-DC SMPS (Switching Mode Power Supply) and LED indoor / outdoor lighting applications.

MagnaChip offers a cost competitive and highly reliable one-chip solution that integrates a discrete
controller and a start-up function together. This sustains the ultra high breakdown voltage up to 800V
while maintaining the low and medium voltage performance. The one-chip solution gives customers the design flexibility to meet a myriad of unique requirements by integrating more functions into a single die.

MagnaChip also offers multiple device options, including N/P-MOS, pEDMOS, nLDMOS, parasitic NPN BJT, high resistance poly, and Zener diodes. The first product from the new ultra high voltage BCD technology is under qualification and volume production is scheduled to begin in November of this year.

TJ Lee, senior vice president and general manager of MagnaChip’s Corporate and SMS Engineering,
commented, “We are very pleased to announce the offering of our robust application-specific ultra high voltage 700V BCD technology to meet the increasing demand for smartgrid and green energy
applications. The new UHV technology will provide our foundry customers with design flexibility to cope with the changing market demand. We expect to expand our application specific technology portfolio as we continually seek to address the specialized needs of our foundry customers going forward.”

About MagnaChip Semiconductor
Headquartered in South Korea, MagnaChip Semiconductor is a Korea-based designer and
manufacturer of analog and mixed-signal semiconductor products for high volume consumer
applications. MagnaChip Semiconductor believes it has one of the broadest and deepest range of
analog and mixed-signal semiconductor platforms in the industry, supported by its 30-year operating
history, a large portfolio of registered and pending patents, and extensive engineering and
manufacturing process expertise.

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