LTC2855 - 3.3V 20Mbps RS485/RS422 Transceiver with Integrated Switchable Termination


  • Integrated, Logic-Selectable 120Ω Termination Resistor
  • 3.3V Supply Voltage
  • 20Mbps Maximum Data Rate
  • No Damage or Latchup Up to ±25kV HBM
  • High Input Impedance Supports 256 Nodes (C-, I‑Grade)
  • Operation Up to 125°C (H-Grade)
  • Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range
  • Current Limited Drivers and Thermal Shutdown
  • Delayed Micropower Shutdown: 5μA Maximum (C-, I-Grade)
  • Power Up/Down Glitch-Free Driver Outputs
  • Low Operating Current: 370μA Typical in Receive Mode
  • Compatible with TIA/EIA-485-A Specifications
  • Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages

Typical Application

LTC2855 Typical Application
LTC2855 Typical Application


The LTC®2854 and LTC2855 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiver includes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus (C-, I-Grade), and a failsafe feature that guarantees a high output state under conditions of floating or shorted inputs.

The driver maintains a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessive power dissipation caused by bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown.

Enhanced ESD protection allows the LTC2854 to withstand ±25kV (human body model) and the LTC2855 to withstand ±15kV on the transceiver interface pins without latchup or damage.

LTC2854 Half DFN-10
LTC2855 Full SSOP-16, DFN-12


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
LTC2855CDE#PBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LTC2855CDE#TRPBF 4x3 DFN-12 DE/UE C 05-08-1695 Yes
LTC2855CGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC2855CGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC2855HDE#PBF 4x3 DFN-12 DE/UE H 05-08-1695 Yes
LTC2855HDE#TRPBF 4x3 DFN-12 DE/UE H 05-08-1695 Yes
LTC2855HGN#PBF SSOP-16 GN H 05-08-1641 (GN16) Yes
LTC2855HGN#TRPBF SSOP-16 GN H 05-08-1641 (GN16) Yes
LTC2855IDE#PBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC2855IDE#TRPBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC2855IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC2855IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes

LTC2855 Package Drawing
LTC2855 Package Drawing
LTC2855 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
LTC2855CDE#PBF 4x3 DFN-12 C $2.48 $1.70 Yes
LTC2855CDE#TRPBF 4x3 DFN-12 C $1.76 Yes
LTC2855CGN#PBF SSOP-16 C $2.48 $1.70 Yes
LTC2855CGN#TRPBF SSOP-16 C $1.76 Yes
LTC2855HDE#PBF 4x3 DFN-12 H $3.29 $2.24 Yes
LTC2855HDE#TRPBF 4x3 DFN-12 H $2.30 Yes
LTC2855HGN#PBF SSOP-16 H $3.28 $2.24 Yes
LTC2855HGN#TRPBF SSOP-16 H $2.30 Yes
LTC2855IDE#PBF 4x3 DFN-12 I $2.98 $2.04 Yes
LTC2855IDE#TRPBF 4x3 DFN-12 I $2.10 Yes
LTC2855IGN#PBF SSOP-16 I $2.98 $2.04 Yes
LTC2855IGN#TRPBF SSOP-16 I $2.10 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


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