This part is a kind of semiconductor called MSJ-40xA-xxx.
Function of this product has ISDN SO Compact SMD Interface Modules.
Manufacturers : Nuvotem Talema
Image and pinout :
Some of the text within the PDF file :
ISDN SO Compact SMD Interface Modules Features • excellent output characteristics ensure compliance with CCITT.I.430 pulse waveform template when used with recommended IC pairing • SMD modules are designed for pick and place compatability • excellent and consistent balance between windings • modular design maximizes suppression effectivity and transmission properties • compact module eliminates three components reducing assembly and storage cost • full compatibility with all common IC's • operating temperature: 0 to 70°C Electrical Specifications @ 25°C Turns Ratio: Bold = IC side windings Compact SMD Modules comply with Basic Insulation Level EN60950, UL1950 and UL1459 Part Number MSJ-400A-XXX MSJ-403A-XXX MSJ-405A-XXX MAJ-400A-XXX MAJ-403A-XXX MAJ-40 [ ... ]