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ESD switches offer latch-up immunity in high-voltage apps

Posted: 11 Dec 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Analog Devices? ESD switch? latch-up? CMOS?

Analog Devices Inc. has unveiled four 8kV ESD switches that guarantee latch-up prevention in high-voltage industrial applications operating up to ±22Vds or 40Vss. ADI's high-voltage ADG5401, ADG5421, ADG5423 and ADG5419 single and dual switches are the latest additions to the latch-up immune family, which now includes configurations from SPSTx1 switches to 32:1 multiplexers, stated the company.

Latch-up, an undesirable high-current state that persists until the power supply is turned off, can lead to device failure. Trench isolation between the N-channel and P-channel transistors of each CMOS switch provides guaranteed latch-up immunity under all conditions. The switches also achieve an industry best 8kV human body model (HBM) ESD rating. Both features help shield equipment from excess current and eliminate the need for designers to install additional protection circuitry. The switches also have low Ron flatness and performance that minimizes temperature variation and feedback resistance and optimizes gain switching.

The ADG5401 and ADG5419 are available with 1 x SPST configuration in 8 ld MSOP, LFCSP packaging for $1.60 and $1.71, respectively, in quantities of 1,000. The ADG5421 and ADG5423 are available with 2 x SPST configuration in 10 ld MSOP, LFCSP packaging for $1.85 each in quantities of 1,000.

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