LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power


  • RS485/RS422 Transceiver: 2500VRMS for 1 Minute
  • UL Recognized ® File #E151738
  • Isolated DC Power: 5V at Up to 200mA
  • No External Components Required
  • 20Mbps or Low EMI 250kbps Data Rate
  • High ESD: ±15kV HBM on Transceiver Interface
  • High Common Mode Transient Immunity: 30kV/μs
  • Integrated Selectable 120Ω Termination
  • 3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation
  • 1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface
  • Maximum Continuous Working Voltage: 560VPEAK
  • High Input Impedance Failsafe RS485 Receiver
  • Current Limited Drivers and Thermal Shutdown
  • Compatible with TIA/EIA-485-A and PROFIBUS
  • High Impedance Output During Internal Fault Condition
  • Low Current Shutdown Mode (< 10μA)
  • General Purpose CMOS Isolated Channel
  • Small, Low Profile (15mm × 11.25mm) Surface Mount BGA and LGA Packages

Typical Application

LTM2881 Typical Application
LTM2881 Typical Application


The LTM®2881 is a complete galvanically isolated full-duplex RS485/RS422 μModule® (micromodule) transceiver. No external components are required. A single supply powers both sides of the interface through an integrated, isolated, low noise, efficient 5V output DC/DC converter.

Coupled inductors and an isolation power transformer provide 2500VRMS of isolation between the line transceiver and the logic interface. This device is ideal for systems where the ground loop is broken allowing for large common mode voltage variation. Uninterrupted communication is guaranteed for common mode transients greater than 30kV/μs.

Maximum data rates are 20Mbps or 250kbps in slew limited mode. Transmit data, DI and receive data, RO, are implemented with event driven low jitter processing. The receiver has a one-eighth unit load supporting up to 256 nodes per bus. A logic supply pin allows easy interfacing with different logic levels from 1.62V to 5.5V, independent of the main supply.

Enhanced ESD protection allows this part to withstand up to ±15kV (human body model) on the transceiver interface pins to isolated supplies and ±10kV through the isolation barrier to logic supplies without latch-up or damage.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprint compatible with Mentor Graphics PADS® v9.5 or later, and Cadence ORCAD® v16.5 or later.

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

15mm x 11.25mm x 2.8mm LGA, 15mm x 11.25mm x 3.42mm BGA

LTM2881 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTM2881CV-3#PBF LGA 32 C $12.07 $8.45 View
LTM2881CV-5#PBF LGA 32 C $12.07 $8.45 View
LTM2881CY-3#PBF BGA 32 C $12.07 $8.45 View
LTM2881CY-5#PBF BGA 32 C $12.07 $8.45 View
LTM2881HV-3#PBF LGA 32 H $17.09 $11.97 View
LTM2881HV-5#PBF LGA 32 H $17.09 $11.97 View
LTM2881HY-3 BGA 32 H $21.20 $14.84 View
LTM2881HY-3#PBF BGA 32 H $17.09 $11.97 View
LTM2881HY-5 BGA 32 H $21.20 $14.84 View
LTM2881HY-5#PBF BGA 32 H $17.09 $11.97 View
LTM2881IV-3#PBF LGA 32 I $14.24 $9.97 View
LTM2881IV-5#PBF LGA 32 I $14.24 $9.97 View
LTM2881IY-3 BGA 32 I $17.10 $11.97 View
LTM2881IY-3#PBF BGA 32 I $14.24 $9.97 View
LTM2881IY-5 BGA 32 I $17.10 $11.97 View
LTM2881IY-5#PBF BGA 32 I $14.24 $9.97 View
LTM2881MPY-3 BGA 32 MP $36.22 $25.36 View
LTM2881MPY-3#PBF BGA 32 MP $30.18 $21.13 View
LTM2881MPY-5 BGA 32 MP $36.22 $25.36 View
LTM2881MPY-5#PBF BGA 32 MP $30.18 $21.13 View
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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
DC1503A-A LTM2881-3 RS485 uModule Isolator Demo Board (3.3V Supply) $50.00
DC1503A-B LTM2881-5 RS485 uModule Isolator Demo Board (5.0V Supply) $50.00
DC1746A-A LTM2881-3 low EMI test board (for EMI evaluation purposes only, no VL & no GPIO) $50.00
DC1746A-B LTM2881-5 low EMI test board (for EMI evaluation purposes only, no VL & no GPIO) $50.00
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Click here to view our complete list of demo boards


  • Isolated RS485/RS422 Interface
  • Industrial Networks
  • Breaking RS485 Ground Loops
  • Isolated PROFIBUS-DP Networks

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