Please recommend me a protection switch to work in the receiver of magnetic resonance device. The specs are like this: 700MHz-800MHz , absorptive, SPDT, minimum losses, 5 ns switching time, high isolation, TTL control is preferable, 20 dBm input. Size is not a problem. Thanks!
HMC284A is a GaAs switch. I am note sure if GaAs is a suitable process for magnetic resonance device application.
You can also look at HC8038 which is absorptive SPDT switch in SOI process. HMC8038 can meet your application requirements except for switching speed as it has turn on/off time of 150ns.