The TPS2115PW is a source selector switch from Texas Instruments, designed to automatically or manually select between two power inputs (2:1 ratio) and route the chosen rail to the load. The part is rated for a continuous output current of 1.25 A, which covers most portable peripherals, sensors, and low-power MCU boards. The delay times — 1 ms turn-on and 5 ms turn-off — are long enough to debounce the source transition but short enough that the downstream regulator or load does not see a brownout.
Supply range, quiescent current, and thermal envelope
The operating voltage range of 2.8 V to 5.5 V covers single-cell Li-ion (3.0 V to 4.2 V) and standard 3.3 V or 5 V rails. The quiescent supply current is 55 µA typical, which is low enough that the selector does not dominate the standby budget in a battery-powered design. The 8-TSSOP package (4.40 mm width) is a compact surface-mount footprint that fits on dense two-layer or four-layer boards.
For volume requirements or tape-and-reel preference, the reel variant TPS2115PWR is the same silicon in a different packaging format — the electrical specifications are identical.