LTC2851MPDD#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2851MPDD#TRPBF is a full-duplex RS-422/RS-485 transceiver from Analog Devices, operating on a 3.3V supply with a maximum data rate of 20Mbps. It features a one-eighth unit load receiver supporting up to 256 nodes and includes failsafe logic for floating inputs. The device operates within a military temperature range of -55°C to +125°C. Key electrical parameters include a typical receive mode current of 370µA and transmit mode current of 450µA. It provides ±15kV HBM ESD protection, thermal shutdown, and current-limited drivers. The component is housed in an 8-lead plastic DFN (3mm × 3mm) package.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex operation with independent driver and receiver channels
• Military-grade reliability across extended temperature ranges
• High input impedance allowing extensive bus node expansion
• Integrated protection against short circuits and thermal overload

Drivers, Receivers, Transceivers Applications

• Harsh environment industrial communication networks
• Military avionics and defense systems
• Multi-node RS-485/RS-422 backplane interfaces

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific MP suffix indicates the military temperature grade (-55°C to +125°C) rather than commercial or industrial variants. Confirm the DD suffix corresponds to the 8-lead DFN package format. Ensure the TRPBF designation matches the required tape and reel packaging configuration for automated assembly processes.

Drivers, Receivers, Transceivers Selection Notes

Select this part when full-duplex capability is required alongside extreme temperature resilience. The high input impedance reduces bus loading compared to standard transceivers. Consider the DFN package for compact board layouts requiring exposed pad soldering for thermal management and grounding stability.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC285x family of low-power interface ICs. While the LTC2850 offers half-duplex functionality and the LTC2852 adds enable pins, the LTC2851 provides dedicated full-duplex transmission without control pin overhead. The MP variant specifically targets applications demanding higher reliability standards than standard commercial grades.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2851IS8#PBF

Drivers, Receivers, Transceivers FAQ

How does the LTC2851 handle unpowered bus lines?

The receiver maintains a high input impedance greater than 96kΩ whether powered or unpowered, ensuring it does not load the bus.

What is the failsafe behavior of the receiver?

The receiver guarantees a logic-high output state when inputs are floating, shorted, or terminated but undriven, spanning the entire common mode range.