Tape & Reel (TR) is the solid enclosure in which optical attenuator is packaged.Due to its 0805 (2012 Metric) packaging, the RF Attenuator is convenient for international shipping.
E-TA2012 T 3DB N4 Features
E-TA2012 T 3DB N4 Applications
There are a lot of Nidec Copal Electronics E-TA2012 T 3DB N4 Attenuators applications.