Low-Voltage, Quad, SPDT, CMOS Analog Switch—Replaces MAX333A

Please check latest availability status for a specific part variant.


The MAX394 is a precision, low-voltage, quad, single-pole/double-throw (SPDT) analog switch. The four independent switches operate with bipolar supplies ranging from ±2.7V to ±8V, or with a single supply of +2.7V to +15V. The MAX394 offers low on-resistance (less than 35Ω), guaranteed to match within 2Ω between channels and to remain flat over the analog signal range (Δ4Ω max). It also offers break-before-make switching (10ns typical), with turn-off times less than 75ns and turn-on times less than 130ns. The MAX394 is ideal for portable operation since quiescent current runs less than 1µA with all inputs high or low.

This monolithic, quad switch is fabricated with Maxim's low voltage silicon-gate process. Design improvements guarantee extremely low charge injection (10pC), low power consumption (10µW), and electrostatic discharge (ESD) greater than 2000V.

Logic inputs are TTL and CMOS compatible and guaranteed over a +0.8V to +2.4V range for supply voltages up to +8V. When supplies exceed +8V, the inputs are typically +0.8V to +4V. Logic inputs and switched analog signals can range anywhere between the supply voltages without damage.
MAX394: Typical Operating Circuit MAX394: Typical Operating Circuit Enlarge+

Key Features

  • Low On-Resistance, < 17Ω Typical (35Ω max)
  • Guaranteed Matched On-Resistance Between Channels, < 2Ω
  • Guaranteed Flat On-Resistance over Analog Signal Range, Δ4Ω Max
  • Guaranteed Charge Injection < 10pC
  • Guaranteed Off-Channel Leakage < 2.5nA at +85°C
  • ESD Guaranteed > 2000V per Method 3015.7
  • Single-Supply Operation (+2.7V to +15V)
  • Bipolar-Supply Operation (±2.7V to ±8V)
  • TTL/CMOS-Logic Compatibility
  • Rail-to-Rail Analog Signal Handling Capability
  • Pin Compatible with MAX333, MAX333A


  • Audio Signal Routing
  • Communication Systems
  • Heads-Up Displays
  • Portable Instrumentation
  • Set-Top Boxes
  • Test Equipment

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.
Request Reliability Report for: MAX394 
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.

Quality Management System >
Environmental Management System >


Related Resources