LTC4300A-3IDD#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4300A-3IDD#TRPBF is a hot swappable 2-wire bus buffer designed for I/O card insertion into live backplanes without data corruption. It provides bidirectional buffering between backplane and card sides, isolating capacitances to maintain signal integrity. The device supports level translation between 2.7V and 5.5V supplies on both VCC and VCC2 pins. It features rise time accelerators that inject up to 2mA of transient boost current to meet SMBus/I2C timing requirements with weaker pull-ups. A CMOS threshold ENABLE pin controls operation, forcing the part into a low current shutdown mode when grounded. The component operates within a temperature range of –40°C to 85°C and is housed in an 8-lead (3mm × 3mm) plastic DFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Hot swap controller prevents SDA and SCL line corruption during live board insertion and removal from backplanes by precharging lines to 1V.
• Rise time accelerator circuitry boosts pull-up currents during positive transitions, allowing the use of weaker DC pull-up resistors while maintaining compliance with I2C and SMBus standards.
• Bidirectional buffering isolates backplane and card capacitances, supporting clock stretching, arbitration, and synchronization protocols.
• CMOS threshold ENABLE input forces the device into a low current state and disconnects the backplane from the card when driven low.

Signal Buffers, Repeaters, Splitters Applications

• Servers
• Desktop computers
• PCI applications requiring hot insertion capabilities

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging configuration. Confirm the IDD suffix corresponds to the industrial temperature grade (-40°C to 85°C). Ensure the DD package designation matches the required 8-lead (3mm × 3mm) plastic DFN footprint for your PCB layout. Cross-reference the manufacturer's latest documentation for any potential product change notifications or lead-free marking updates.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring hot swapping of I/O cards into active backplanes. It is suitable for applications needing isolation between backplane and card capacitances to preserve signal rise times. Choose this part if the design requires level translation between different supply voltages ranging from 2.7V to 5.5V on both bus sides. Ensure the system accommodates the 8-lead DFN package dimensions and thermal characteristics specified for the industrial grade variant.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4300A family of hot swappable 2-wire bus buffers. Variants such as the LTC4300A-1 and LTC4300A-2 offer similar buffering functions but may lack specific enable controls or have different package options. The LTC4300A-3 specifically adds the logic threshold ENABLE pin for external control of the connection state. Other family members like the LTC4301 provide supply-independent buffering without hot swap capabilities.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitute part numbers include the LTC4300A-1 and LTC4300A-2 series. These alternatives provide similar hot swap and buffering functions but differ in feature sets, such as the absence of the ENABLE pin in the -1 and -2 variants. Verify package compatibility and electrical specifications before substitution.