Hot swap controller for 2.7V to 16.5V rails
The Analog Devices ADM1172-2AUJZ-RL7 is a single-channel hot swap controller designed to manage inrush current and protect the upstream supply during board insertion. It operates from a 2.7V to 16.5V supply and draws 650 µA quiescent current. The part integrates latched fault protection and undervoltage lockout (UVLO), with programmable current limit, fault timeout, and turn-on voltage via external resistors. Housed in a TSOT-23-8 package, it suits general-purpose hot swap applications in industrial control, telecom infrastructure, and power distribution boards where the board must be inserted or removed live without glitching the bus.
The ADM1172-2AUJZ-RL7 lets you set the current limit threshold and the fault timeout period with external resistors, not fixed internal values. That means one BOM line covers multiple load currents — a 1 A card and a 3 A card can use the same controller with different resistor values. The UVLO threshold is also programmable, so you can tailor the turn-on voltage to the minimum rail voltage your system guarantees. For a procurement decision, this part reduces SKU count across a product family: one controller, one footprint, multiple current settings.
For a BOM planner, this means no last-time-buy scramble and no forced redesign for the foreseeable future. The TSOT-23-8 package is a common footprint, so second-sourcing or cross-referencing to a pin-compatible part like the ADM4210-2AUJZ-RL7 is straightforward if supply tightens.
Industrial temperature range and package handling
The TSOT-23-8 package is a thin SOT-23 variant — same 2.9 mm x 2.8 mm footprint as a standard SOT-23-8, but lower profile (1.1 mm max).