338S00839 USB Charging IC

When an iPhone 14 series device won't charge at all, or the charging cuts in and out even after you've already swapped the charging port flex, the fault usually sits deeper on the board — at the Tigris IC itself. The 338S00839 sits in the charging power path and manages how the device negotiates power input, so a damaged or corroded chip creates exactly the kind of "dead after flash" or "charging issue" symptoms your customers describe.You'll find this IC on iPhone 14, iPhone 14 Plus, iPhone 14 Pro, and iPhone 14 Pro Max boards, where technicians commonly refer to it by its schematic label, U4001. It replaced the earlier 338S00770 used on the iPhone 13 series and was itself succeeded by the 338S00946 on iPhone 15 boards, so keeping the correct generation in stock matters — installing the wrong revision won't restore charging and can create new faults on the board.Board-level repair on this chip is not a beginner task. You're working with a BGA package, so you need a hot air rework station capable of precise, low-airflow reflow, along with a stencil sized for this chip's ball layout and a reliable reballing process. Rushing the reflow or using excess heat risks lifting nearby pads or damaging adjacent components, so controlled temperature profiling on your rework station matters more here than raw airflow power.In your actual workflow, this chip comes into play on a few recurring jobs. A phone that shows no response to any charger, cable, or power source after a drop or liquid exposure often points here once you've ruled out the charging port and battery connector. A board that charges only at certain angles, or that charges briefly and then stops, points to a cracked or partially lifted IC rather than a fully dead one — reflow first before jumping to a full chip swap. And boards that show charging current on your DC power supply but never register in diagnostics mode also lead back to this IC once the PMU and battery connector test clean.Before you commit to swapping the IC, confirm your diagnosis on the bench. Run the board on a DC power supply and watch the current draw pattern — a short or abnormal draw around the charging power rail narrows things down fast. Cross-check with a multimeter for continuity and shorts around the U4001 pads, and inspect under your microscope for corrosion, lifted pads, or visible damage before you commit to a reflow. Confirming the fault at the component level saves you from reflowing a chip that wasn't actually the problem.Stock genuine 338S00839 chips alongside your existing iPhone 14 series repair inventory — charging port flex cables, battery connectors, and your hot air and reballing toolkit — so you're not stopping mid-job to source a single part. For a shop running regular iPhone 14 series charging repairs, having this IC on the shelf turns a multi-day turnaround into a same-day fix.