Analog Devices Inc. ADG7421F Dual Single-Pole/Single-Throw Switch

Analog Devices Inc. ADG7421F Dual Single-Pole/Single-Throw Switch features overvoltage protection, power-off protection, and overvoltage detection on the source pins. When no power supplies are present, the switch remains in the off condition, and the switch inputs are high impedance. When powered, if the analog input signal levels on the Sx pins exceed VDD or VSS by a threshold voltage, VT, the switch automatically turns off and the digital FF (fault flag) pin drops to a logic low to indicate a fault.


  • Overvoltage fault protection up to ±60V on S1 and S2 pins
  • Power-off protection up to ±60V on S1 and S2 pins
  • Overvoltage detection on S1 and S2 pins
  • Known state output without digital inputs present
  • Low on-resistance: 12Ω typical
  • Ultraflat, on resistance: 0.005Ω typical
  • Low fault detection threshold voltage: 0.1V typical
  • 3 kV HBM ESD rating
  • Latch-up immune under any circumstance
  • ±1.8V to ±2.5V dual supply operation
  • 1.8V to 5.5V single-supply operation
  • 10-Lead, 3mm × 2mm LFCSP

Application Circuit

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