Dual ±25V Above- and Below-the-Rails 4:1 Analog Multiplexer

Simplify Designs with the Industry's First ±25V Above- and Below-the-Rails Multiplexer

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The MAX14778 dual 4:1 analog multiplexer supports analog signals up to ±25V with a single 3.0 to 5.5V supply. Each multiplexer has separate control inputs to allow independent switching, making the device ideal for multiplexing different communications signals with the same connector pins. Extended ESD protection of ±6kV (Human Body Model) enable direct interfacing to cables and connectors.

The MAX14778 features a low 1.5Ω (max) on-resistance and 3mΩ (typ) flatness to maximize signal integrity over the entire common-mode voltage range. Each multiplexer can carry up to 300mA of continuous current through the multiplexer in either direction.

The MAX14778 supports switching of full-speed USB 1.1 signals (12Mbps) and RS-485 data rates of up to 20Mbps.

The MAX14778 is available in a 20-pin (5mm x 5mm) TQFN package and is specified over the -40°C to +85°C extended temperature range.
MAX14778: Typical Operating Circuit MAX14778: Typical Operating Circuit Enlarge+

Key Features

  • Flexible Multiplexer Switches a Wide Array of High-Voltage and Low-Voltage Signals Such as RS485, RS232, and USB 1.1
    • Two Independent Multiplexers
    • Break-Before-Make Operation
    • 1.5Ω RON (max)
    • 3mΩRON Flatness (typ)
    • 300mA Maximum Current Through Multiplexer
    • 78pF Input Capacitance
    • 75MHz Large-Signal Bandwidth
  • Ideal for Space-Constrained and Mobile Applications
    • 20-Pin TQFN (5mm x 5mm) Package
  • Wide Signal Range Supported from Single-Supply Voltage Eliminates Negative Power Supply
    • ±25V Signal Range
    • Single 3.0V to 5.5V Supply
  • ESD Protection Circuitry Eliminates Need for External Protection Circuitry
    • Extended ESD Protection on A_ and B_ Pins
    • ±6kV Human Body Model (HBM)


  • Audio/Data Multiplexing
  • Communication Systems
  • Connector Sharing
  • Gaming Machines
  • Handheld Industrial Devices
  • POS Peripherals
  • RS-485/RS-232/USB 1.1 Multiplexing
Part NumberConfig.ChannelsVSUPPLY (Single)
VSUPPLY (Single)
Dynamic Range (max)
minmaxmaxminmaxmaxmaxtypmaxSee Notes
MAX14778 4-to-1235.525-2525501.50.00375200172078
$4.85 @1k
See All Switches and Multiplexers (Low Voltage) (163)

Part NumberFunctionsPackage/Pins
MAX14778 Mux
See Data Sheet
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.

MAX14778EVKIT: Evaluation Kit for the MAX14778

Technical Documents

App Note 5758 Analog Integration Drives Factory Integration

Quality and Environmental Data

Product Reliability Reports: MAX14778.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
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.

Quality Management System >
Environmental Management System >


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