Hongfa HFD31 Series Subminiature Signal Relays 1A SSS – Hongfa HFD31/5-S, A 1A subminiature signal relay from the HFD4 series with a single side stable 5V DC coil and a DPDT contact configuration. Comes in a compact SMT package that gives excellent board space savings. Hongfa HFD31/5-S 5 Volt Coil, DPDT , Fully Sealed, 2A, SMT Type, AgNi+Au