RITD-HBT means Resonant Interband Tunnel Diode - Heterojunction Bi-polar Transistor in Electronics
Similar to RITD-HBT
2W - Two Wire 3D - Three Dimensional 3R3 - 3.3 ohm Resistor 3SR - Three Station Rotating 4P4T - Quad-Pole Quad-Throw 4W - 4-Watt Resistor 4WA - Four Wire Analog