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ADG438F:  High Performance, 8-Channel, Fault-Protected Analog Multiplexer

Product Details

The ADG438F and ADG439F are CMOS analog multiplexers, with the ADG438F comprising eight single channels and the ADG439F comprising four differential channels. These multiplexers provide fault protection. Using a series n-channel, p-channel, and n-channel MOSFET structure, both device and signal source protection is provided in the event of an overvoltage or power loss. The multiplexer can withstand continuous overvoltage inputs from −40 V to +55 V. During fault conditions with power supplies off, the multiplexer input (or output) appears as an open circuit and only a few nanoamperes of leakage current flows. This protects not only the multiplexer and the circuitry driven by the multiplexer, but also protects the sensors or signal sources which drive the multiplexer.

The ADG438F switches one of eight inputs to a common output as determined by the 3-bit binary address lines, A0, A1, and A2. The ADG439F switches one of four differential inputs to a common differential output as determined by the 2-bit binary address lines, A0 and A1. An EN input on each device is used to enable or disable the device. When disabled, all channels are switched off.

Product Highlights

  1. Fault Protection. The ADG438F and ADG439F can with-stand continuous voltage inputs up to −40 V or +55 V. When a fault occurs due to the power supplies being turned off, all the channels are turned off and only a leakage current of a few nanoamperes flows.
  2. On channel saturates while fault exists.
  3. Low RON.
  4. Fast Switching Times.
  5. Break-Before-Make Switching. Switches are guaranteed break-before-make so that input signals are protected against momentary shorting.
  6. Trench Isolation Eliminates Latch-Up. A dielectric trench separates the p-channel and n-channel MOSFETs thereby preventing latch-up.
  7. Improved Off Isolation. Trench isolation enhances the channel-to-channel isolation of the ADG438F/ADG439F.


  • Data acquisition systems
  • Industrial and process control systems
  • Avionics test equipment
  • Signal routing between systems
  • High reliability control systems


  • All switches off with power supply off
  • Analog Output of ON Channel Clamped within Power Supplies If an Overvoltage Occurs
  • Latch-up proof construction
  • Fault and Overvoltage Protection (-40 V, + 55 V)
  • Fast switching times
    ton 250 ns max
    toff 150 ns max
  • Break-Before-Make Switching Action
  • TTL and CMOS Compatible inputs

Functional Block Diagram for ADG438F


Title Content Type File Type
ADG438F/ADG439F: High Performance, 4/8 Channel, Fault-Protected Analog Multiplexers Data Sheet (Rev E, 07/2011) (pdf, 130 kB) Data Sheets PDF
AN-1024: How to Calculate the Settling Time and Sampling Rate of a Multiplexer  (pdf, 210 kB) Application Notes PDF
AN-355: Behind the Switch Symbol  (pdf, 132 kB)
Use CMOS Analog Switches More Effectively When You Consider Them as Circuits
Application Notes PDF
Data-acquisition system uses fault protection
By Catherine Redmond, Analog Devices, Inc. (EDN, 4/15/2004)
Technical Articles HTML
CMOS Switches Offer High Performance in Low Power, Wideband Applications  (pdf, 320 kB)
by Theresa Corrigan and Ray Goggin, Analog Devices, Inc. (High Frequency Electronics, February 2004)
Technical Articles PDF
Temperature monitor measures three thermal zones
by Susan Pratt, Analog Devices, Inc. (EDN, 12/11/03)
Technical Articles HTML
Enhanced Multiplexing for MEMS Optical Cross Connects
by James Caffrey (Fiberoptic Product News, 8/2003)
Technical Articles HTML
Winning the Battle Against Latchup in CMOS Analog Switches
(Analog Dialogue, Vol. 35, No. 5, October, 2001)
Analog Dialogue HTML
Switches and Multiplexers Product Selection Guide  (pdf, 1462 kB) Product Selection Guide PDF
Multiplexer Parametric Search Product Selection Guide HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

ADG438F Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADG438FBN Status: Production 16 ld PDIP 16 Ind Tube, 25 $5.16 $4.39 N  Material Info PCN/PDN Purchase Sample
ADG438FBNZ Status: Production 16 ld PDIP 16 Ind Tube, 25 $4.46 $3.80 Y  Material Info PCN/PDN Purchase Sample
ADG438FBR Status: Production 16 ld SOIC 16 Ind Tube, 48 $5.01 $4.25 N  Material Info PCN Purchase
ADG438FBR-REEL Status: Production 16 ld SOIC 16 Ind Reel, 2500 - $4.25 N  Material Info PCN/PDN Purchase
ADG438FBRZ Status: Production 16 ld SOIC 16 Ind Tube, 48 $4.33 $3.68 Y  Material Info PCN Purchase
ADG438FBRZ-REEL Status: Production 16 ld SOIC 16 Ind Reel, 2500 - $3.68 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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