LTC2872 - RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination


  • Four RS232 and Two RS485 Transceivers
  • 3V to 5.5V Supply Voltage
  • 20Mbps RS485 and 500kbps RS232
  • Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors
  • Half-/Full-Duplex RS485 Switching
  • Logic Loopback Mode
  • High ESD: ±16kV on Line I/O
  • 1.7V to 5.5V Logic Interface
  • Supports Up to 256 RS485 Nodes
  • RS485 Receiver Full Failsafe Eliminates UART Lockup
  • Available in 38-Pin 5mm × 7mm QFN Package

Typical Application

LTC2872 Typical Application
LTC2872 Typical Application
LTC2872 Typical Application


The LTC®2872 is a robust pin-configurable transceiver that supports RS232, RS485, and RS422 standards while operating on a single 3V to 5.5V supply. The LTC2872 can be configured as four RS232 single-ended transceivers or two RS485 differential transceivers, or combinations of both, on shared I/O lines.

Pin-controlled integrated termination resistors allow for easy interface reconfiguration, eliminating external resistors and control relays. Half-duplex switches allow four-wire and two-wire RS485 configurations. Loopback mode steers the driver inputs to the receiver outputs for diagnostic self-test. The RS485 receivers support up to 256 nodes per bus, and feature full failsafe operation for floating, shorted or terminated inputs.

An integrated DC/DC boost converter uses a small inductor and one capacitor, eliminating the need for multiple supplies for driving RS232 levels.


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
LTC2872CUHF#PBF 5x7 QFN-38 UHF C 05-08-1701 Yes
LTC2872CUHF#TRPBF 5x7 QFN-38 UHF C 05-08-1701 Yes
LTC2872IUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC2872IUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes

LTC2872 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
LTC2872CUHF#PBF 5x7 QFN-38 C $9.21 $6.45 Yes
LTC2872CUHF#TRPBF 5x7 QFN-38 C $6.51 Yes
LTC2872IUHF#PBF 5x7 QFN-38 I $9.93 $6.95 Yes
LTC2872IUHF#TRPBF 5x7 QFN-38 I $7.01 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.

Part Number Description Price Documentation
DC1851A LTC2872 RS232/RS485 Dual Multiprotocol Transceiver with Integrated Termination $25.00
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  • Flexible RS232/RS485/RS422 Interface
  • Software Selectable Multiprotocol Interface Ports
  • Point-of-Sale Terminals
  • Cable Repeaters
  • Protocol Translators
  • PROFIBUS-DP Networks

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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
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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