Download FAQ: Extended temperature mid

Frequently Asked Questions
New Extended Temperature Mid-Voltage MOSFET Family
GENERAL QUESTIONS
What is Fairchild announcing?
A new expanded line of extended temperature (ET) mid-voltage MOSFETs, which
enable customers to achieve high power density in high-temperature designs. The devices
are rated at 175° C to deliver new levels of energy efficiency for smaller, more reliable
high-speed solutions. Ultimately, the higher operating temperatures allow up to 85
percent greater power density and up to 3X more reliability than MOSFETs rated to the
150° C industry standard.
What does the expanded line of ET mid-voltage MOSFETs include?
The family includes 19 new devices, available in both 5 mm x 6 mm (Power56) and 3
mm x 3 mm (Power33) standard packages, as well as the new TO-Leadless (TO-LL) 9.8
x 11.7 mm package.
What is the voltage range for the 19 new ET mid-voltage MOSFETs?
The devices are offered in a wide range of voltage ratings, including 30V, 40V, 60V,
80V, 100V, 120V and 150V.
What markets and applications are ET mid-voltage MOSFETs targeting?
They are ideal for end systems that must function in high ambient temperatures. The
substantially greater reliability of the devices is an advantage for products used in harsh
environments, including avionics, railway and power tool applications. Applications also
include high density DC-DC converters, high density AC-DC converters and high density
motor drive circuits incorporated in multi-kW power supplies, solar micro inverters,
forklifts, agricultural equipment and small form factor AC-DC adapters.
What is IPC-9592?
The IPC9592 standard establishes industry performance requirements for power
conversion devices. The standard states that power MOSFETS must be derated by 25° C
from the max rated junction temperature. That means MOSFETS rated at the standard
150° C cannot exceed 125° C, where as 175° C max rated MOSFETS can run up to 150°
C. With the higher temperature margin, designers can push more power through the
MOSFETs where PCB temperature ratings allow. A good example is high density
isolated DC-DC used in server and telecom applications.
How does the new family of extended temperature mid-voltage MOSFETs help
designers comply with the IPC-9592 power conversion standard?
The new 175° C junction rating means the maximum junction temperature can be up to
150° C, as opposed to 125° C for standard 150° C devices, enabling more design margin
and power density within the confines of IPC-9592.
Can you elaborate on the 85 percent greater power density of the new ET midvoltage MOSFETs?
The higher power density in very small packages is a major advantage as it gives
manufacturers greater flexibility with their product designs. It allows designers to either
decrease the form factors of their products – while maintaining the same power output –
or to increase the power output without having to increase form factor.
Can you elaborate on the new ET mid-voltage MOSFETs being up to three times
more reliable than MOSFETs rated to the 150° C industry standard?
By having a higher temperature rating, Fairchild’s extended temperature family can
demonstrate higher reliability ratings, given the margin between 150° C and 175° C, as
measured by Mean Time to Failure (MTTF) and the Failure in Time (FIT) ratings.
When should customers use the ET mid-voltage MOSFETs versus other Fairchild
MOSFETs?
The ability of the new ET mid-voltage MOSFETs to cope with much higher temperatures
makes them ideal for products that operate in very high ambient temperatures, such as
solar power applications. They are also ideal for high temperature product designs that
cannot use heat sinks or other approaches to dissipating heat due to cost, complexity or
size constraints. Additionally, their substantially greater reliability makes them well
suited for products that must cope with extreme temperature swings, aerospace, railway
and power tool applications.
What is the competition for the ET mid-voltage MOSFETs?
Fairchild’s new ET mid-voltage MOSFETs uniquely combine a broad range of voltages
(30V to 150V) with high performance silicon in MLP packaging, which gives designers
much more choice and flexibility with their product designs. This contrasts with
competitive offerings which have limited performance and voltage ranges.
With the new ET mid-voltage MOSFETs does Fairchild have more extended
temperature FETs than anyone else?
We have the broadest range in traditional leaded packaging and now with the addition of
our new leadless packaging option we are approaching 400 devices with 175° C max Tj
capability. The outstanding depth and breadth of our ET MOSFET families gives
manufacturers maximum choice in finding an ET MOSFET with the best set of features,
performance and price for their specific applications.
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TECHNICAL QUESTIONS
How have you achieved the higher temperature rating for your new ET mid-voltage
MOSFETs?
To qualify these packages at 175° C we use packaging materials that are both well trusted
in the industry and capable of enduring the higher operating temperatures.
SCHEDULE AND TIMING QUESTIONS
When will the new 19 ET mid-voltage MOSFETs be sampled and production
available?
Currently, nine of the 13 MLP 5x6 mm and 3x3 mm devices are fully released with
samples and four are planned to follow in the next three months. Also, four of the TOLL 9.8 x 11.7 mm devices are fully released with samples and two more are planned to
follow in the next two months.
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