Features and Benefits

  • No Power-Supply Sequencing Required
  • All Channels Off with Power Off
  • Rail-to-Rail Signal Handling
  • 400Ω (max) On-Resistance
  • ±40V Fault Protection with Power Off
  • ±25V Fault Protection with ±15V Supplies
  • 100ns Fault-Response Time
  • ±4.5V to ±20V Dual Supplies
  • +9V to +36V Single Supply
  • TTL/CMOS-Compatible Logic Inputs

Product Details

The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-protected multiplexers are pin compatible with the industry-standard DG508/DG509. The MAX4708/MAX4709 are similar to the MAX4508/MAX4509, but these devices do not have clamp diodes to the supply rails on the switch outputs. These multiplexers feature fault-protected inputs, rail-to-rail signal-handling capability, and do not require power-supply sequencing.

Both devices offer ±40V overvoltage protection with the supplies off, ±36V protection with the supplies on, and feature 400Ω (max) on-resistance with 15Ω (max) matching between channels. The MAX4708/MAX4709 operate with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. All digital inputs have TTL logic-compatible thresholds, ensuring both TTL and CMOS logic compatibility when using a single +12V supply or dual ±15V supplies.

For low-voltage applications requiring fault protection, refer to the MAX4711/MAX4712/MAX4713 data sheet.


  • ATE Systems
  • Avionics
  • Data Acquisition Systems
  • Hot Swap
  • Industrial and Process Control
  • Redundancy/Backup Systems
  • Signal Routing

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Product Recommendations

MAX4709 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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