LTC2857IDD-2#PBF

Drivers, Receivers, Transceivers Overview

The LTC2857IDD-2#PBF is a low-power, full-duplex RS485/RS422 transceiver manufactured by Analog Devices Inc. It operates on a single 5V supply and supports maximum data rates of either 20Mbps or 250kbps for low EMI applications. The device features a one-eighth unit load receiver input resistance exceeding 96kΩ, supporting up to 256 nodes per bus in C and I grades. It includes enhanced ESD protection rated at ±15kV (HBM), current-limited drivers, and thermal shutdown. The IDD suffix indicates an industrial temperature range from -40°C to +85°C, and the package type DD corresponds to an 8-lead plastic DFN (3mm × 3mm).

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex operation with independent driver and receiver channels.
• Slew rate limited output for reduced electromagnetic interference emissions.
• Guaranteed failsafe receiver operation ensuring high output during floating inputs.
• High input impedance allowing connection of up to 256 nodes on the bus.

Drivers, Receivers, Transceivers Applications

• Industrial automation networks requiring robust communication over twisted pair cables.
• Building automation systems utilizing RS485 or RS422 protocols.
• Low EMI environments where controlled signal slew rates are necessary.
• Backplane transceivers in multi-node serial communication architectures.

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm temperature grade and package variant. Ensure compatibility with system voltage requirements and interface standards before integration. Cross-reference part markings with datasheet specifications to validate authenticity and revision level.

Drivers, Receivers, Transceivers Selection Notes

Select this component when full-duplex communication is required alongside strict EMI constraints. The 250kbps mode is suitable for long-distance transmission where signal integrity is prioritized over speed. Verify that the 8-lead DFN package fits the available PCB footprint and thermal management strategy.

Drivers, Receivers, Transceivers Part Context

This part belongs to the LTC285x family of low-power RS485/RS422 transceivers. It shares architectural similarities with half-duplex variants like the LTC2856 but provides simultaneous transmit and receive capabilities. The family emphasizes fault protection and high node count support within compact surface-mount packages.

Drivers, Receivers, Transceivers Replacement Considerations

Publicly confirmed substitutes include other members of the LTC285x series such as the LTC2857CDD-2#PBF for commercial temperature ranges or the LTC2857HDD-2#PBF for extended automotive ranges. Direct pin-compatible alternatives may exist within the broader Analog Devices portfolio, but electrical characteristics must be verified.