This part is a kind of semiconductor called BA103.
Function of this product has DC to DC Converter.
Manufacturers : XP Power
Image and pinout :
Some of the text within the PDF file :
DC/DC Converters International Power Sources, Inc. 260 Hopping Brook Road Holliston, Massachusetts 01746 Tel. (508) 429-4440 Fax (800) 226-2100 http://www.intlpower.com BA/BC Series: 1.5 - 6.0 Watts Single and Dual Outputs FEATURES • Input π Filter • Fully Regulated Outputs • Industry Standard Pinouts • 5, 12, 24, 28, and 48 VDC Inputs • Ripple and Noise Less Than 50mVpp • Input/Output Isolation Ordering Guide: Series/Input Code/Output Code Example: BC302 - BC Series, 24 Volt Input, 12 Volt Output @ 0.47A DataShee Input Code Series BA BC Output 1.5 Watts 5-6 Watts 1 2 3 4 5 Input Voltage BA/BC Series 5 V Nominal 12 V Nominal 24 V Nominal 28 V Nominal 48 V Nominal Output Code 01 02 03 04 05 Output Voltage(s) 5 VDC 12 [ ... ]