LT1081 - Advanced Low Power 5V RS232 Dual Driver/Receiver


  • Superior to CMOS Improved Speed: -Operates over 120kBaud-Improved Protection: Outputs Can Be Forced
    to ±30V
  • Absolutely No Latchup
  • CMOS Comparable Low Power: 60mW
  • Can Power Additional RS232 Drivers: 10mA
  • Supply Current in Shutdown: 1µA
  • Available in SO Package
  • Available with or without Shutdown

Typical Application

LT1081 Typical Application
LT1081 Typical Application


The LT®1080/LT1081 are the only dual RS232 driver/receiver with charge pump to guarantee absolutely no latchup. These interface optimized devices provide a realistic balance between CMOS levels of power dissipation and real world requirements for ruggedness. The driver outputs are fully protected against overload and can be shorted to ±30V. Unlike CMOS, the advanced architecture of the LT1080/LT1081 does not load the signal line when “shut down” or when power is off. Both the receiver and RS232 outputs are put into a high impedance state. An advanced output stage allows driving higher capacitive loads at higher speeds with exceptional ruggedness against ESD.

For applications requiring up to five drivers and five receivers with charge pump in one package see the LT1130A Series data sheet. A version of the LT1080/LT1081, the LT1180A and LT1181A that use only 0.1µF capacitors, is also available. All of Linear Technology’s RS232 ICs are available in standard surface mount packages.



CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT1081CN#PBF N-16 N C 05-08-1510 (N16) Yes
LT1081CSW#PBF SW-16 SW C 05-08-1620 (SW16) Yes
LT1081CSW#TRPBF SW-16 SW C 05-08-1620 (SW16) Yes
LT1081IN#PBF N-16 N I 05-08-1510 (N16) Yes
LT1081ISW#PBF SW-16 SW I 05-08-1620 (SW16) Yes
LT1081ISW#TRPBF SW-16 SW I 05-08-1620 (SW16) Yes

LT1081 Package Drawing
LT1081 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT1081CN#PBF N-16 C $3.17 $2.55 Yes
LT1081CSW#PBF SW-16 C $4.00 $3.25 Yes
LT1081CSW#TRPBF SW-16 C $3.31 Yes
LT1081IN#PBF N-16 I $4.58 $3.70 Yes
LT1081ISW#PBF SW-16 I $5.50 $4.45 Yes
LT1081ISW#TRPBF SW-16 I $4.51 Yes
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* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Portable Computers
  • Battery-Powered RS232 Systems
  • Power Supply Generator
  • Terminals
  • Modems

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
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  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
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  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
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