The 421DD Series from Teledyne Relays is a RF Relay with Frequency 10 MHz to 1 GHz, Coil Voltage 5.0 to 32.0 V, Voltage 4.5 to 19.0 V (Set/Reset Voltage), Current 11.2 to 111.8 mA, Power 290 mW. Tags: TO-5. More details for 421DD Series can be seen below.