View utc81xx-series datasheet:

UTC 81XX LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE PIN CODE PIN 1 PIN 2 PIN 3 PIN4 PIN 5 MARKING 3 2 VCC VOUT GND -- -- DATE CODE SOT-23 VOLTAGE PIN CODE CODE 3 VOUT GND VCC -- -- 2 1 5 GND VOUT VCC -- -- 3 2 1 A NC NC GND VOUT VCC DATE CODE VOLTAGE SOT-25 CODE PIN CODE B VOUT VCC GND NC NC 4 5 UTC D Vcc GND Vout -- -- 81XX TO-92 DATE PIN CODE CODE E Vout Vin GND 1 2 3 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNIT Storage temperature TSTG -40~+125 °C Operating temperature TOPR -20~+75 °C Power supply voltage VCC -0.3~+10 V ELECTRICAL CHARACTERISTICS (Ta=25°C, The unit of resistance is Ω unless otherwise indicated.) PARAMETER SYMBOL (*1) TEST CONDITIONS MIN TYP MAX UNIT Detection Voltage Vs 1 RL=470Ω, UTC 8150