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LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power
- UL Rated RS485/RS422 Transceiver: 2500VRMS 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
- Common Mode 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
The LTM®2881 is a complete galvanically isolated fullduplex RS485/RS422 μModule® 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
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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||Pins||Temp||Price (1-99)||Price (1k)*||RoHS Data|
|Buy Now • Request Samples|
Demo BoardsLinear 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.
|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|
- Isolated RS485/RS422 Interface
- Industrial Networks
- Breaking RS485 Ground Loops
- Isolated PROFIBUS-DP Networks
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