Low-field MRI is of increasing interest due to its low cost, improved safety, portability, and low power requirements. A transmit/receive switch is an essential piece of hardware used to dynamically connect a coil to either the transmitter or receiver. Current low field systems typically use passive crossed-diode TR switches. For RF excitation with small flip angles, there may not be sufficient forward bias voltage to turn on the diodes in passive switches, which limits fast imaging and MR fingerprinting. In this study we evaluate alternative active T/R switches for low power experiments and compare them, at 6.7 and 30 mT.