LTC4304IMS#PBF

The LTC4304IMS#PBF from Analog Devices is a hot-swappable 2-wire (I²C/SMBus) bus buffer and accelerator with integrated stuck-bus recovery, designed to enable live board insertion and removal in multi-point backplane architectures. The device provides bidirectional capacitive isolation between the backplane and the plug-in card, preventing signal corruption during connection. Key technical features include automatic stuck-bus detection and recovery; if a device holds the SDA or SCL line low for an extended period, the LTC4304 disconnects the card and generates clock pulses to release the bus, restoring normal operation without system reset. Rise-time accelerator circuits allow driving of heavily loaded buses up to 400 kHz, while a pre-charge function minimizes glitches on the bus when a card is inserted. The buffer supports level translation between 2.7 V to 5.5 V card-side supplies and 2.2 V to 5.5 V backplane supplies, and the MSOP package provides a compact footprint for space-constrained designs.

Typical applications include live-insertion backplanes in telecommunications equipment, industrial control systems, enterprise servers and data storage arrays, as well as high-reliability systems where uninterrupted operation is critical. In aerospace and defense platforms, the device is used in mission computers and fault-tolerant bus architectures that require board swap under power. The part number suffix indicates an industrial temperature range (–40°C to +85°C) and lead-free MSOP packaging, making it suitable for robust commercial and industrial environments. From a procurement standpoint, the LTC4304 remains an active, mature Analog Devices product with low obsolescence risk. ZZX Electronics sources this device through authorized channels with full traceability, supporting long-term availability for programs in the industrial, defense, and avionics sectors where qualification stability and continuity of supply are essential.