LTC2857HDD-2#TRPBF

Drivers, Receivers, Transceivers Overview

The LTC2857HDD-2#TRPBF is a low-power, full-duplex RS485/RS422 transceiver operating on a 5V supply. It supports a maximum data rate of 250kbps with slew-rate limiting for low EMI applications. The device features a one-eighth unit load receiver input resistance exceeding 96kΩ, supporting up to 256 nodes per bus. Enhanced ESD protection withstands ±15kV (HBM) without latchup. It includes current-limited drivers and thermal shutdown for fault protection. The part operates within a temperature range of -40°C to 125°C (H-Grade) and is housed in an 8-Lead Plastic DFN (3mm × 3mm) package.

Drivers, Receivers, Transceivers Feature Summary

• Full-duplex operation with independent transmit and receive channels
• Slew-rate limited driver outputs for reduced electromagnetic interference emissions
• High input impedance receiver supporting up to 256 nodes on the bus
• Robust protection against electrostatic discharge and bus contention faults

Drivers, Receivers, Transceivers Applications

• Low EMI industrial communication networks
• Multi-drop RS485/RS422 bus systems
• Backplane transceivers requiring high node density
• Level translation interfaces in harsh electrical environments

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing components. Confirm the H-grade designation matches the required -40°C to 125°C operating temperature range for your application. Ensure the DD package type corresponds to the 8-lead DFN footprint required by your PCB layout. Cross-reference the manufacturer's latest documentation for any updates regarding lead-free compliance or material declarations.

Drivers, Receivers, Transceivers Selection Notes

Select this component when full-duplex communication is required alongside strict EMI constraints. The 250kbps data rate is suitable for applications where signal integrity and noise reduction are prioritized over high-speed throughput. Verify that the system can accommodate the 5V supply voltage requirement. Consider the thermal performance of the DFN package if the ambient temperature approaches the upper limit of the H-grade specification.

Drivers, Receivers, Transceivers Part Context

This device belongs to the LTC285x family of rugged RS485/RS422 transceivers. It shares core architectural features with the half-duplex LTC2856 and the enabled variants LTC2858. The primary distinction lies in its full-duplex configuration and lack of separate enable pins for the driver and receiver, simplifying control logic compared to other family members.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2857CDD-2#PBF: Same functional specifications but packaged in tubes instead of tape and reel.

Drivers, Receivers, Transceivers FAQ

What is the receiver input resistance of the LTC2857HDD-2?

The receiver input resistance is guaranteed to be greater than 96kΩ in receive mode or unpowered, representing a one-eighth unit load.

How does the device handle bus faults?

The device includes current-limited drivers and thermal shutdown protection to prevent excessive power dissipation caused by bus contention or short circuits.

What is the failsafe behavior of the receiver?

The receiver guarantees a high output state under conditions of floating or shorted inputs, provided the inputs remain undriven for more than approximately 3µs.