Hot-swap controller for I2C and SMBus backplanes
The TCA4307DGKR is a single-channel hot swap controller from Texas Instruments designed to insert and remove I2C-bus and SMBus cards from a live backplane without corrupting the bus or causing glitches on the data and clock lines. It integrates an internal switch and operates from a 2.3V to 5.5V supply rail, drawing 2.5 mA typical supply current. The 2.3V minimum means it works with both standard 2.5V and 3.3V I2C logic levels, and the 5.5V ceiling covers the 5V-tolerant SMBus specification.
Programmable protection and temperature range
Programmable features include slew-rate control and undervoltage lockout (UVLO) threshold. The slew-rate setting limits inrush current when the card is inserted, preventing the backplane supply from drooping; the UVLO threshold ensures the bus controller does not attempt to communicate until the supply rail is stable.
Package options and board-level fit
The TCA4307DGKR is offered in an 8-VSSOP package (supplier device package,), also described as 8-TSSOP or 8-MSOP with a 3.00mm body width. The 0.65mm pin pitch is a common footprint that routes easily on a two-layer board without micro-vias. The reel quantity is the standard TI 2500-unit reel for this package — a single reel covers most prototype runs and low-volume production without breaking the tape.