T8xxH
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T10xxH
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T12xxH
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T16xxH
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T20xxH
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The new high junction temperature TRIAC
series, known as HiTj,
can be used in hot environments, and also wherever high power density
is needed on the PCB. Their extreme ruggedness eliminates the need
for the usual RC snubber circuit, and due to their considerable
thermal margin (Tj= 150 °C) with no derating whatsoever, they
can use minimal size heatsinks.
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This is the first time that such performance is proposed
while common practices correspond to a standard derating of the
performance at 150 °C, this new series secures the application
operation even in dense or harsh operating conditions with minimal
heatsink and snubber budget.
New high Tj TRIAC series allows new thermal design rules
Increasing the maximum operating junction temperature allows:
A reduced heatsink (Rthca), or
An increase in the maximum ambient temperature of the application,
or
An increase in the RMS current
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High power density
on board |
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The further thermal margin offered by the new HiTj TRIACs is a real
asset when increasing power. Where a conventional 125 °C TRIAC
has to be dimensioned as X-size for a given operation, a Hi Tj is
X-1 or X-2, reducing the global cost of the application.
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In some cases, industrial applications operate at a hot ambient
temperature. For outside applications (lighting, automation), or
when the PCB is in a confined enclosure (vacuum cleaners, washing
machines), the higher max operating junction temperature of the
new HiTj TRIACs solves this technical constraint.
How to solve the
150 °C challenge |
The key factors enabling construction of a TRIAC able to operate
up to 150 °C are the reliability and the leakage current. These
constraints were taken into account at the design stage.
A critical intrinsic parameter of the TRIAC is its ability to turn-off
properly. The turn-off capability (di/dt)c is strongly dependent
on the junction temperature. In order to avoid the risk of losing
control at high temperatures due to the inability to switch-off,
the new HiTj series has a switch-off capability 3 to 4 times higher
than the first harmonic current slope, coping with currents affected
by superimposed noise ripple due to loads of the brush motor type.
The new series is ideal for vacuum cleaners and washing machine
drum motors where heatsink size is critical due to raw material
prices. 8 to 20 A devices are instrumental for 800 to 2000 W motor
range.
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T16xxH |
T20xxH |
ITRMS |
8 A |
10A
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12A
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16A
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20A |
TJMAX
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150°C with no derating
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VDRM
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600
V
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IGT
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35 or 50
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dV/dt
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1000
to 1500 V/μs min
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(di/dt)c |
3 to 4 times the nominal
value
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