LTC4303IDD#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4303IDD#PBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. in an 8-lead DFN (3mm × 3mm) package. It operates within a supply voltage range of 2.7V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device provides bidirectional buffering for SDA and SCL lines, featuring automatic disconnect when the bus remains stuck low for 30ms or more. It includes rise-time accelerators that provide up to 5.5mA transient boost current, ensuring compliance with I²C Fast-Mode standards up to 400kHz while isolating backplane and card capacitances.

Signal Buffers, Repeaters, Splitters Feature Summary

• Automatic recovery mechanism generates clock pulses to unstick buses held low for extended periods
• Rise-time accelerator circuitry enables the use of larger pull-up resistors without violating timing specifications
• Precharge logic forces SDA and SCL lines to 1V during insertion to minimize live board disturbance

Signal Buffers, Repeaters, Splitters Applications

• Hot swapping I/O cards into live CompactPCI backplanes
• Capacitance buffering and bus extension in RAID systems
• Isolating input and output sides in ATCA IPMB architectures

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific IDD suffix confirms the industrial temperature grade (-40°C to +85°C). Ensure the #PBF designation is present to confirm lead-free manufacturing compliance. Cross-reference the DFN package outline against your PCB footprint requirements before finalizing orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when active isolation between backplane and card capacitance is required during live insertion. The rise-time accelerators are essential for maintaining signal integrity with high-capacitance buses using standard pull-up values. Verify ENABLE pin control strategies align with staggered connector timing requirements.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4303 family of hot swappable bus buffers. It serves as a direct replacement for the LTC4300A-1 regarding pin compatibility. The IDD variant specifically extends the operating temperature range compared to commercial grade options, making it suitable for demanding industrial environments.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The LTC4300A-1 is confirmed as a pin-compatible substitute within the same product family.