TAV1-551+ Ultra-Low-Noise E-PHEMT Transistor Mini-Circuits TAV1-551+ Ultra-Low-Noise E-PHEMT Transistor is a low noise, high gain device manufactured using E-PHEMPT technology enabling it to work with a single positive supply voltage. A small footprint saves space in dense layouts while providing low inductance, repeatable transitions, and excellent thermal contact to the PCB. It features an outstanding Noise figure, particularly below 2.5GHz, and when combining this noise figure with gain in a single device it makes it an ideal amplifier for multiple applications.