Quad, Rail-to-Rail, Fault-Protected, SPDT Analog Switch

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The MAX4533 quad, single-pole/double-throw (SPDT), fault-protected analog switch is pin-compatible with the industry-standard MAX333 and MAX333A. The MAX4533 features fault-protected inputs and rail-to-rail signal handling. The normally open (NO_ ) and normally closed (NC_ ) terminals are protected from overvoltage faults up to ±25V with power on and up to ±40V with power off. During a fault condition, NO_ and NC_ become high impedance with only nanoamperes of leakage current flowing to the source. In addition, the output (COM_) clamps to the appropriate polarity supply rail and provides up to ±10mA of load current. This ensures unambiguous rail-to-rail outputs when a fault occurs.

The MAX4533 operates from dual ±4.5V to ±18V power supplies or a single +9V to +36V supply. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL and CMOS logic compatibility when using ±15V supplies or a +12V supply. On-resistance is 175Ω max and is matched between switches to 10Ω max. The off-leakage current is only 0.5nA at TA = +25°C and 10nA at TA = +85°C.
MAX4533: Typical Operating Circuit MAX4533: Typical Operating Circuit Enlarge+

Key Features

  • Rail-to-Rail Signal Handling
  • ±40V Fault Protection with Power Off
  • ±25V Fault Protection with ±15V Supplies
  • All Switches Off with Power Off
  • No Power-Supply Sequencing Required During Power-Up or Power-Down
  • Output Clamped to Appropriate Supply Voltage During Fault Condition-No Transition Glitch
  • 1kΩ (typ) Output Clamp Resistance During Overvoltage
  • 175Ω (max) Signal Paths with ±15V Supplies
  • 20ns (typ) Fault Response Time
  • ±4.5V to ±18V Dual Supplies
  • +9V to +36V Single Supply
  • Pin-Compatible with Industry-Standard MAX333/MAX333A
  • TTL/CMOS-Compatible Logic Inputs with ±15V or Single +9V to +15V Supplies


  • Avionics and Military Systems
  • Communication Systems
  • Data Acquisition
  • Industrial and Process Control
  • Portable Instrumentation
  • Redundant/Backup Systems
  • Test Equipment

See parametric specs for Switches and Multiplexers (Mid and High Voltage) (299)

Part NumberFunctionsConfig.# ChannelsVSUPPLY (Single)
VSUPPLY (Single)
(min)(max)(min)(max)(max)(max)(max)(max)(See Notes)
MAX4533 SwitchSPDT49364.5181750.52501501.5125
SOIC (W)/20
$4.36 @1k

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

App Note 5299 Selecting the Right CMOS Analog Switch
Product Reliability Reports: MAX4533.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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