This part is a kind of semiconductor called STR81145A.

Function of this product has (STRxxxx) Voltage Doubler/Bridge Rectifier Automatic Switch ICs.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

sVoltage Doubler/Bridge Rectifier Automatic Switch ICs Absolute Maximum Ratings (Ta=25°C) Repetitive RMS Surge Operating Storage Voltage Peak Off-state On-state On-state Temperature Temperature Doubler Voltage Current Current Function Turn-on Voltage VDRM (V) IT (RMS)(A) ITSM (A) TOP (°C) Tstg (°C) Vs (V) 5.0 500 10.0 5.0 500 10.0 50 100 50 100 –10 to +100(TC) –20 to +100(TC) –30 to +125 –40 to +125 DC100 max AC80 max Electrical Characteristics (Ta=25°C) OFF-state ON-state Current Voltage Setting Switchover Voltage VC1 (V) 196±5 215±5 205±5 225±5 VC2 (VAC)* 145 100 max 159 145 100 max 159 *Reference value 1.8 max With latching capability 1.8 max IDRM (µA) VTH (V) Part No. Remarks STR80145A 81145A 81159A STR82145 83145 83159 sExternal Dimensions 4.5±0.2 (unit: mm) b [ ... ]

STR81145A PDF Datasheet Download