LTC2870HUFD#PBF

Drivers, Receivers, Transceivers Overview

The LTC2870HUFD#PBF is a multiprotocol transceiver supporting RS232, RS485, and RS422 protocols. It operates on a single 3V to 5.5V supply with a logic interface range of 1.7V to 5.5V. The device integrates an RS485 transceiver capable of 20Mbps data rates and up to 256 nodes, alongside two RS232 transceivers operating at 500kbps. Pin-controlled integrated termination resistors provide automatic selection of 120Ω for RS485 and 5kΩ for RS232. An internal DC/DC boost converter generates the required ±7V supplies using a single external inductor and capacitor. The component supports half-duplex switching, loopback diagnostics, and full failsafe operation.

Drivers, Receivers, Transceivers Feature Summary

• Pin-configurable multiprotocol support for RS232, RS485, and RS422 interfaces
• Integrated DC/DC boost converter eliminates need for multiple external power supplies
• Software-selectable automatic termination resistor switching for bus impedance matching
• High ESD protection ratings on interface pins for robust industrial environments

Drivers, Receivers, Transceivers Applications

• Point-of-Sale Terminals
• Cable Repeaters
• Protocol Translators

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free finish and tube packaging when sourcing. Confirm the H-grade designation corresponds to the extended temperature range of –40°C to 125°C. Ensure the QFN package dimensions match the 4mm × 5mm footprint requirements for the target PCB layout.

Drivers, Receivers, Transceivers Selection Notes

Select this model for applications requiring simultaneous or switchable RS232 and RS485 communication on shared or dedicated lines. The integrated termination reduces bill of materials by removing external resistors. Verify that the 3V to 5.5V VCC supply aligns with system voltage rails and that the 1.7V minimum logic level accommodates the host controller.

Drivers, Receivers, Transceivers Part Context

This component belongs to the LTC2870/LTC2871 family of multiprotocol transceivers manufactured by Analog Devices Inc. The HUFD suffix identifies the high-temperature grade (H) housed in a 28-lead plastic QFN package (UFD). It serves as a pin-compatible alternative to standard C and I grades within the same series.

Drivers, Receivers, Transceivers Replacement Considerations

LTC2870IUFD#PBF offers identical functionality with a lower industrial temperature range of –40°C to 85°C.