The new MOSFETs for CFL at 450V are the
STS1DNC45 in a double island version of SO-8 for surface mounting, and the
STQ1NC45R-AP in TO-92. They join the performance of the NK series at 450V devices also with the flexibility of small packages.
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175°C as maximum operating temperature
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± 4kV HBM ESD protection minimum
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Fully protected device
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Reverse battery protection
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Higher current capability
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100% avalanche tested
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Logic level input and lower VCE(SAT)
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The products keep the exceptional stability of the BVCES versus temperature (-55°C to 175°C) that ensures a very stable behaviour of the zener diodes over the whole temperature range. The built-in zener diodes ensure ruggedness against voltage spikes wherever they occur and it is possible to withstand repetitive inductive switching currents avoiding the operation in breakdown mode.
This means no stress to the device and so improving its reliability and thus the life of the whole application. Since the clamping voltage depends on the external gate resistance, to avoid an avalanche breakdown instead of active zener clamping, generally the gate resistor value should not drop below 200 ohm.
Typical clamping voltages as a function of the gate resistor
(normalized @ Rg=1K Ohm)
