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Solid state relays made in the past have also employed zero voltage crossing circuits to ensure turn on of the thyristor only when the a.c. voltage is within some small "window". These circuits have also been relatively complex and difficult tointegrate into the main power chip. Thus, zero cross firing circuits have required the use of a discrete resistor connected across the power terminals. These resistors have not been easily integrated into a single chip because of the difficulty offorming this resistor on the chip surface.

It has also been difficult to provide so-called "snubberless" operation for the relay under any inductive or resistive load. Thus, while solid state relays may operate well under resistive or slightly inductive loads, they may tend to "halfwave" or "chatter", which is a condition wherein a relay turns on only for one-half of a cycle, under a highly inductive load.