45 Ohm SPDT Analog Switch in SOT23-8

High-Voltage, SPDT Analog Switch in Tiny SOT

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The MAX4649 is a dual-supply, single-pole/double-throw (SPDT) analog switch. On-resistance is 45Ω max and flat (7Ω max) over the specified signal range. The MAX4649 can handle rail-to-rail analog signals, and conducts analog or digital signals equally well in either direction. This switch operates from a single +9V to +36V supply, or from ±4.5V to ±20V dual supplies. The primary application areas are in the switching and routing of signals in telecommunications and test equipment.

The MAX4649 features a switch transition time of 130ns max at +25°C, and a guaranteed break-before-make switching time of 5ns. Off-leakage current is only 2nA max at +25°C.

The MAX4649 is available in a tiny 8-pin SOT23 package.
MAX4649: Pin Configuration MAX4649: Pin Configuration Enlarge+

Key Features

  • Low On-Resistance 45Ω max ±15V Supplies
  • 5Ω max RON Match Between Channels
  • Guaranteed RON Flatness Over Specified Signal Range (7Ω max)
  • VL Logic Supply Not Required
  • Rail-to-Rail Signal Handling
  • +9V to +36V Single Supply Operation
  • ±4.5V to ±20V Dual Supply Operation
  • Low Crosstalk: -92dB at 1MHz
  • High Off-Isolation: -92dB at 1MHz
  • TTL/CMOS-Compatible Control Inputs


  • Bridges
  • High-Speed Access (Telecom)
  • Modems
  • Network Hubs, Switches, Routers
  • Routers/Switches
  • Telecom Switches
  • X-Ray and Ultrasound Diagnostics
Part NumberFunctionsConfig.ChannelsVSUPPLY (Single)
VSUPPLY (Single)
minmaxminmaxmaxmaxmaxmaxSee Notes
MAX4649 SwitchSPDT19364.5204541301302176
$1.65 @1k
See All Switches and Multiplexers (Mid and High Voltage) (299)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

Tutorial 3823 Switching Video Using Analog Switches

Quality and Environmental Data

Product Reliability Reports: MAX4649.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX4649EKA
  • MAX4649EKA+
  • MAX4649EKA+T
  • MAX4649EKA-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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