news digest ♦ LEDs
mobile semiconductor solutions, developed the FODM8801, part of the OptoHiT™ series of high temperature phototransistor optocouplers. These devices use Fairchild’s proprietary OPTOPLANAR® coplanar packaging technology to achieve high noise immunity and reliable isolation at high operating temperatures.
The FODM8801 consists of an aluminum gallium arsenide (AlGaAs) infrared light emitting diode optically coupled to a phototransistor. The device provides a guaranteed Current Transfer Ratio (CTR) for both saturated and non-saturated modes of operation and switching specifications over the extended operating temperature range (-40°C to +125°C) for greater design flexibility.
The device offers excellent CTR linearity at high temperature and operates at a very low input current (IF). The FODM8801 is packaged in a compact, half-pitch, mini-flat, 4-pin package (1.27mm lead pitch), saving board space and providing more design flexibility, allowing for overall reductions in system cost.
Additionally, the FODM8801 provides high isolation voltage for increased reliability in lead-free environments. Devices in the OptoHiT series are ideally suited for industrial applications, including power supplies, motor controls and consumer applications, which include chargers and adapters.
The FODM8801 is part of Fairchild’s comprehensive portfolio of high performance optocouplers that offer leading-edge noise immunity resulting from its proprietary OPTOPLANAR coplanar packaging technology. The OPTOPLANAR technology ensures safe insulation thickness of more than 0.4 millimeters in attaining reliable high voltage isolation, and provides >5mm creepage and clearance distance, certified by UL1577 and DIN_ EN/IEC60747-5-2 standards.
www.fairchildsemi.com.
MOCVD shipments see first year-over-year decline in 2.5 years
A growing oversupply of LEDs and expiring 70
www.compoundsemiconductor.net November/December 2011
subsidies in China have contributed to the reduction. On the upside, shipments for GaN-on- silicon reactors saw an upsurge.
IMS Research released the MOCVD chapters of its 300-page “Quarterly LED Supply and Demand Report” in November 2011 which revealed significant changes in MOCVD market share and the MOCVD market outlook.
MOCVD shipments for all applications fell Q/Q and Y/Y to 170 units. It was the first Y/Y decline in at least 2.5 years.
The decline can be attributed to depressed utilisation in the GaN LED space along with a growing oversupply in LEDs, tight credit, facility readiness and expiring subsidies in China. A bright spot was rising shipments of MOCVD systems for GaN on silicon.
MOCVD revenues were down sequentially for the 3rd consecutive quarter and Y/Y for the first quarter in at least 2 years, falling to $340 million.
Veeco led in total MOCVD unit and revenues for the first time, earning a 63% share of tool shipped, shown in Figure 1, and 65% share of revenues. Aixtron’s share fell from 50% to 34% in units and 52% to 32% of revenues.
Veeco did benefit from the recognition of previously shipped MaxBright reactors to the GaN LED market. However, if those were excluded, Veeco still would have enjoyed a commanding 56% to 40% unit share advantage indicative of the acceptance of this new platform and Aixtron’s customer delays
Figure 1: Total MOCVD Unit Share
GaN is the dominant application for MOCVD tools which are used to produce blue/green LEDs.
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