Date: 04/11/2010

Power-off protection switches from ADI for data and communications systems

Analog Devices, Inc. has made available two power-off protection switches that guarantee an off-state in the absence of a power supply. Unlike standard switches, which can be either open or closed when no power supply is present, ADI’s ADG4612 and ADG4613 power-off protection switches ensure an off-state, which prevents potentially damaging current from flowing to circuit boards used in data communications, communications infrastructure systems, and other sensitive equipment. The guaranteed off-state feature is particularly useful in applications where analog signals may be present at the switch inputs before the power supply voltage is on, or where the user has no control over the power supply sequence. The ADG4612 and ADG4613 switches also feature overvoltage protection, which can block signal levels up to 16 V in the off state.

These switches feature low on resistance of 6.1-ohm (max) and are suitable for data acquisition and gain switching applications. By maintaining same resistance for all linput voltages, these switches does not distort the signal particularly while switching audio signals. The ADG4612 and ADG4613 contain four independent SPST (single-pole/single-throw) switches. Each switch in the ADG4612 is turned on with Logic 1 on the appropriate control input; two switches in the ADG4613 turn on with Logic 1 and two switches turn on with Logic 0—with break-before-make switching action for use in multiplexer applications.


.Product Availability Temperature
Range Price Each
Per 1,000 Packaging
ADG4612 NOW -40°C to
+85°C $1.87 16-lead TSSOP

3-mm x 3-mm
16-lead LFCSP
ADG4613 NOW -40°C to
+85°C $1.87 16-lead TSSOP

3-mm x 3-mm
16-lead LFCSP