LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power

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.

Features
  • RS485/RS422 Transceiver: 2500VRMS for 1 Minute
  • UL-CSA Recognized File #E151738
  • CSA Component Acceptance Notice 5A
  • 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
  • 15mm × 11.25mm BGA and LGA Packages
Typical Application
LTM2881 Typical Application
LTM2881 Typical Application
Applications
  • Isolated RS485/RS422 Interface
  • Industrial Networks
  • Breaking RS485 Ground Loops
  • Isolated PROFIBUS-DP Networks
Packaging
LTM2881 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTM2881CV-3#PBF15mm × 11.25mm × 2.82mm LGAC$12.07$8.45
LTM2881CV-5#PBF15mm × 11.25mm × 2.82mm LGAC$12.07$8.45
LTM2881CY-3#PBF15mm x 11.25mm x 3.42mm BGAC$12.07$8.45
LTM2881CY-5#PBF15mm x 11.25mm x 3.42mm BGAC$12.07$8.45
LTM2881HV-3#PBF15mm × 11.25mm × 2.82mm LGAH$17.09$11.97
LTM2881HV-5#PBF15mm × 11.25mm × 2.82mm LGAH$17.09$11.97
LTM2881HY-3#PBF15mm x 11.25mm x 3.42mm BGAH$17.09$11.97
LTM2881HY-5#PBF15mm x 11.25mm x 3.42mm BGAH$17.09$11.97
LTM2881IV-3#PBF15mm × 11.25mm × 2.82mm LGAI$14.24$9.97
LTM2881IV-5#PBF15mm × 11.25mm × 2.82mm LGAI$14.24$9.97
LTM2881IY-3#PBF15mm x 11.25mm x 3.42mm BGAI$14.24$9.97
LTM2881IY-5#PBF15mm x 11.25mm x 3.42mm BGAI$14.24$9.97
LTM2881MPY-315mm x 11.25mm x 3.42mm BGAMP$36.22$25.36
LTM2881MPY-3#PBF15mm x 11.25mm x 3.42mm BGAMP$30.18$21.13
LTM2881MPY-515mm x 11.25mm x 3.42mm BGAMP$36.22$25.36
LTM2881MPY-5#PBF15mm x 11.25mm x 3.42mm BGAMP$30.18$21.13
Demo Boards
Part NumberDescriptionPrice
DC1503A-ALTM2881-3 RS485 uModule Isolator Demo Board (3.3V Supply)$50.00
DC1503A-BLTM2881-5 RS485 uModule Isolator Demo Board (5.0V Supply)$50.00
DC1746A-ALTM2881-3 low EMI test board (for EMI evaluation purposes only, no VL & no GPIO)$50.00
DC1746A-BLTM2881-5 low EMI test board (for EMI evaluation purposes only, no VL & no GPIO)$50.00
Datasheet
Application Note
Reliability Data
Product Selector Card
Quality
LT Journal
Press Release
Software and Simulation
CAD Symbol
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