Step recovery diodes produce an abrupt turn-off (step) time by allowing a very fast release of stored charge when switching from forward to reverse bias, and from reverse to forward bias. Single step recovery diodes consist of one diode built into the chip. Step recovery diode arrays are composed of multiple, discrete, usually unconnected diodes on a single silicon chip. Performance specifications for step recovery diodes include forward voltage, maximum allowable reverse voltage, reverse current, breakdown voltage, reverse recovery time, power dissipation, terminal capacitance, and operating temperature. Pin count and the number of embedded diodes are factors to consider when selecting an integrated circuit (IC) package. Step-recovery diodes that are sold in Europe must comply with the Restriction of Hazardous Substances (RoHS) directive from the European Union (EU).