LTC4331HUFD#PBF

Specialized ICS Overview

The LTC4331HUFD#PBF is a point-to-point SMBus compatible I2C slave device extender designed for high-noise industrial environments. It utilizes a ±60V fault-protected differential transceiver to extend an I2C/SMBus bus, including SMBALERT and control signals, over a single twisted-pair link up to 1200m. The device supports an extended common-mode operating range of ±15V to tolerate large ground differences between nodes. Key electrical parameters include a VCC supply range of 3V to 5.5V, a VL logic supply range of 1.62V to 5.5V, and a maximum driver short-circuit current of ±250mA. It operates within the industrial temperature range of –40°C to 125°C.

Specialized ICS Feature Summary

• Extends I2C/SMBus networks up to 1200m using a rugged differential link with ±60V fault protection.
• Supports I2C Fast-mode Plus (Fm+) with selectable baud rates via SPEED1/SPEED2 pins.
• Features an extended common-mode input range of ±15V for tolerance to ground potential differences.
• Includes low EMI mode via SLO pin to reduce emissions from the differential link.

Specialized ICS Applications

• Industrial Control Systems
• Sensor Networks
• Lighting Control
• Sound System Control

Specialized ICS Procurement Notes

Verify the specific suffix HUFD#PBF corresponds to the –40°C to 125°C industrial grade and QFN-20 package. Confirm that the ordering suffix does not alter the functional specifications unless explicitly stated in the manufacturer's documentation. Ensure compatibility with the required voltage levels and interface timing configurations for the target application.

Specialized ICS Selection Notes

Select this component when extending I2C buses over long distances in electrically noisy environments requiring robust fault protection. Ensure the local master controller supports SCL clock-stretching to handle link latencies. Verify that both ends of the link are configured with identical SPEED1 and SPEED2 settings to match baud rates. Consider the Low EMI Mode if electromagnetic interference is a concern.

Specialized ICS Part Context

This part belongs to the LTC4331 series of I2C extenders. The 'H' designation indicates the industrial temperature grade (–40°C to 125°C), distinguishing it from the 'C' (commercial) and 'I' (industrial) variants. The UFD package denotes the 20-lead 4mm × 5mm plastic QFN form factor.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.