LTC4305IDHD#PBF

Specialized Overview

The LTC4305IDHD#PBF is a 2-channel, 2-wire bus multiplexer with capacitance buffering. It provides capacitive isolation between an upstream I²C/SMBus and downstream buses. The device supports supply voltages from 2.7V to 5.5V for VCC, while downstream channels can be pulled up to independent voltages within the same range. It features programmable disconnect from stuck buses via timeout circuitry (default 30ms), rise time accelerators, and ALERT fault reporting. The component is housed in a 16-lead (4mm × 5mm) DFN package.

Specialized Feature Summary

• Provides capacitive isolation between upstream and downstream 2-wire buses
• Supports nested addressing with 27 distinct configurable addresses
• Includes programmable disconnect from stuck low bus conditions
• Features SMBus compatible ALERT response protocol for fault reporting

Specialized Applications

• I²C and SMBus bus extension and fan-out increase
• Live board insertion and removal protection for backplanes
• Level shifting between different voltage domains (e.g., 5V/3.3V)
• Nested addressing in complex multi-master systems

Specialized Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the IDHD package variant matches the required thermal and physical constraints. Ensure the operating temperature range aligns with industrial specifications if ambient conditions exceed commercial limits.

Specialized Selection Notes

Select this component for applications requiring isolation between I²C masters and multiple downstream slaves. Consider the rise time accelerator feature for high-capacitance buses. Verify that the downstream pull-up voltages remain within the 2.2V to 5.5V range to ensure proper buffer operation.

Specialized Part Context

This part belongs to the LTC4305 family of 2-wire bus multiplexers. It is designed to manage connectivity between a single upstream bus and two downstream channels. The IDHD suffix denotes the 16-lead DFN package version, which offers improved thermal performance compared to SSOP variants.

Specialized Replacement Considerations

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