I2C hot-swap buffer in a 12-MSOP footprint
The LTC4315IMS#TRPBF is a single-channel I2C buffer and accelerator from Analog Devices, purpose-built for hot-swap applications on a 2-wire bus. It sits in a 12-MSOP package (0.118", 3.00mm width) and operates from a 2.9 V to 5.5 V supply, drawing 8.1 mA typical. Rated for a maximum data rate of 400 kHz, it meets the standard I2C Fast-mode ceiling. The 10 pF input capacitance keeps bus loading predictable when multiple devices share the same 2-wire bus. The operating temperature range spans -40°C to 85°C, covering industrial enclosures and outdoor telecom cabinets without a grade upcharge.
Supply range and current budget for the BOM
The 2.9 V to 5.5 V supply range means this buffer works on both 3.3 V and 5 V I2C rails. The 8.1 mA supply current is the total draw from the VCC pin — budget this into the rail's total load, not just the I2C pull-up current. Because it is a hot-swap buffer, it isolates the bus capacitance of a plug-in card from the main bus. The 10 pF input capacitance is the load the buffer presents to the upstream bus, not the downstream side.
Lifecycle and compliance posture
The LTC4315IMS#TRPBF carries an active lifecycle status from Analog Devices. It is also ROHS3 compliant, so it meets the current EU restriction threshold without an exemption. Sourced through independent distribution channels; availability and current pricing are confirmed at RFQ against the BOM quantity.