PT4115

PT4115 is the SOT-89-5 tape-and-reel ordering code for the UMW (UTD Semiconductor) PT4115 constant-current LED driver, listed word-for-word in the ordering information of the UMW datasheet at 1,000 pieces per reel. UMW publishes no lifecycle grading system; the code is current in its datasheet and product line. By UMW’s own electrical table the input range is 6 V to 30 V with an absolute maximum of 35 V - documents from other vendors for a same-name part quote a 40 V ceiling, which does not apply to the UMW device and is not used here. The current-sense threshold is 95 mV minimum, 100 mV typical and 105 mV maximum, the internal switch carries 1.2 A maximum with 0.4 Ω typical on-resistance at a 24 V input, switching runs up to 1 MHz, thermal protection trips at 160 °C typical and output current accuracy is ±5%. The selection point is a single-inductor buck driver for one or a string of high-brightness LEDs in retrofit lamps, signage and appliance lighting. Selection advice: set the LED current with the sense resistor against the 100 mV threshold and design the SOT-89-5 tab copper for the worst-case dissipation - the package, not the 1.2 A switch rating, sets the practical ceiling. Parameters verified against the UMW PT4115 datasheet (ordering information and electrical characteristics).