This part is a kind of semiconductor called B2405LS-1W.

Function of this product has DC-DC CONVERTER.

Manufacturers : WAYJUN

Image and pinout :

Some of the text within the PDF file :

DC-DC CONVERTER Features: z BXXXXLS-1W z HIGH POWER DENSITY z SIP7 PACKAGE z SINGLE OUTPUT z INDUSTRIAL STANDARD PIN-OUT z NO HEAT SINK REQUIRED z 1KVDC ISOLATION z FIXED INPUT z UNREGULATED OUTPUT z PCB MOUNTING ELECTRICAL SPECIFICATIONS All specifications tested typically @ 25°C, humidity<75%, nominal input and rated output unless otherwise noted. Input Voltage:5V/12, 15, 24 VDC Output Voltage: 3.3, 5, 9, 12, 15 ,24 VDC OUTPUT SPECIFICATIONS Items: Testing condition Output accuracy: At full load and nominal Vin Continued short circuit time Line voltage calibration For Vin change of 1% Load regulation: From 20% to full load Ripple and noise: 20MHz bandwidth Temperature drift: Switching frequency Min Typ 100 mV p-p 100KHz Max ±5% <1S +/- 1.2 % +/-8% ±0.02 %/°C COMMO [ ... ]

B2405LS-1W PDF Datasheet Download