LTC4301LCMS8#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4301LCMS8#TRPBF is a hot swappable, supply-independent 2-wire bus buffer designed for I2C and SMBus applications. It enables safe insertion of I/O cards into live backplanes by isolating input and output capacitances and preventing bus corruption during connection. The device supports bidirectional buffering for SDA and SCL lines, allowing pull-up voltages as low as 1V on the input side while translating to standard 3.3V or 5V logic rails on the output. Key electrical parameters include a supply voltage range of 2.7V to 5.5V, a maximum operating frequency of 600kHz, and an operating temperature range of 0°C to 70°C for the LC variant. It features 10kV HBM ESD protection and includes a READY digital output to indicate connection status.

Signal Buffers, Repeaters, Splitters Feature Summary

• Supply-independent operation allows level translation from 1V signals to standard 3.3V and 5V logic rails without requiring specific connector pin designs.
• Prevents data and clock bus corruption during live board insertion and removal through controlled connection sequencing and capacitance isolation.
• Supports I2C Fast Mode and SMBus standards up to 400kHz with capabilities for clock stretching, arbitration, and synchronization.

Signal Buffers, Repeaters, Splitters Applications

• Hot swap I/O card insertion into active server backplanes
• Capacitance buffering and bus extension in desktop computer systems
• Level translation between low-voltage embedded controllers and standard logic buses

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify that the LC suffix corresponds to the commercial temperature range (0°C to 70°C) rather than the industrial range (-40°C to 85°C). Confirm the TRPBF suffix indicates tape and reel packaging with lead-free composition. Ensure the application environment remains within the specified voltage limits and thermal constraints defined in the datasheet.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when supply independence is required to bridge different voltage domains on a single bus. The MSOP-8 package is suitable for space-constrained designs. Consider the LC temperature rating against environmental conditions; use the LI variant if operation below 0°C is necessary. Verify that the 600kHz maximum frequency meets system timing requirements.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4301L family of hot swappable bus buffers. It shares functionality with the LTC4300A but offers supply-independent level translation. The MS8 package designation refers to the 8-lead plastic MSOP form factor. It serves as a bridge between backplane interfaces and peripheral cards, distinct from addressable buffers like the LTC4302.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitutes include the LTC4301LIMS8#PBF for industrial temperature range or the LTC4300A series for non-level-shifting hot swap applications. Verify package compatibility and electrical specifications before substitution.

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4301L handle live insertion without corrupting the bus?

It uses a precharge circuitry and connection sense logic to delay connecting the SDA and SCL pins until a stop bit or bus idle condition is detected, ensuring transients settle before establishing the link.

What is the function of the CS pin?

The CS pin gates the connection between input and output. Driving it high isolates the sides and asserts READY low, while driving it low allows the part to connect after a stop bit or bus idle occurs.

Can the device operate with different supply voltages on the input and output sides?

Yes, it is supply-independent and can translate signals from input pull-ups as low as 1V to output rails of 3.3V or 5V, provided the VCC supply is within the 2.7V to 5.5V range.