Low-Voltage 3.5Ω, SPDT, CMOS Analog Switches

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Part Details
Part Models 4
1ku List Price Starting From $1.75
  • Low 3.5Ω RON (+2.7V Supply)
  • 0.45Ω RON Flatness (+2.7V Supply)
  • 0.05Ω RON Match Between Channels (+2.7V Supply)
  • Tiny SC70 and µDFN Packages
  • -3dB Bandwidth: 300MHz
  • Low On-Capacitance: 19.5pF
  • 0.036% Total Harmonic Distortion
  • Low Supply Current: 1nA
  • +1.8V to +5.5V Single-Supply Operation
Additional Details
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The MAX4729/MAX4730 single-pole/double-throw (SPDT) switches operate from a single supply ranging from +1.8V to +5.5V. These switches provide low 3.5Ω on-resistance (RON), as well as 0.45Ω RON flatness with a +2.7V supply. These devices typically consume only 1nA of supply current, making them ideal for use in lowpower, portable applications. The MAX4729/MAX4730 feature low-leakage currents over the extended temperature range, TTL/CMOS-compatible digital logic, and excellent AC characteristics.

The MAX4729/MAX4730 are available in small 6-pin SC70 and 6-pin µDFN packages. The MAX4729/MAX4730 are offered in three pinout configurations to ease design. The MAX4729/MAX4730 are specified over the extended -40°C to +85°C temperature range.


  • Audio/Video Signal Routing
  • Battery-Operated Equipment
  • Communications Circuits
  • Low-Voltage Data-Acquisition Systems
  • Relay Replacement
  • Sample-and-Hold Circuits
Part Models 4
1ku List Price Starting From $1.75

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Reference Designs

Reference Designs 1


Novato (MAXREFDES16#): 4-20mA Loop-Powered Temperature Sensor with HART

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Novato (MAXREFDES16#): 4-20mA Loop-Powered Temperature Sensor with HART

Novato (MAXREFDES16#): 4-20mA Loop-Powered Temperature Sensor with HART

Features and Benefits

  • 2-, 3-, or 4-wire RTD sensor input
  • -200°C to +850°C measured temperature range
  • -40°C to +85°C operating range
  • 0.03°C temperature resolution
  • < 0.05% span error or ±0.2°C at +23°C (whichever is greater)
  • < 0.1% span error or ±1.0°C over operating range
  • 12V to 40V supply voltage range
  • 200µA RTD excitation current
  • Auto compensation of wire resistance for 3-wire RTD
  • 4–20mA current loop output
  • 10Ω to 1kΩ loop load
  • Highway addressable remote transducer (HART) communication protocol requires minimum load of 230Ω
  • Sensor burnout detection
  • NAMUR down scale: < 3.2mA
  • NAMUR up scale: programmable from 20.5mA to > 24mA
  • Loop current limiter: 30mA ±5mA
  • HART protocol compatible
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