Shown on this slide and the next is the family of AC switches, beginning at the top with the ACS and the ACST. This is a type of AC switch which has built-in overvoltage protection, therefore, if there are transient voltages across the main terminals of the device, it automatically protects itself. These types of parts also have very high immunity to noise, dV/dt, which is fast rising transient voltages across the main terminals of the AC switch, and high commutation capability, which means when it turns off and on, it has a very rugged capability on the rise time of the current, dI/dt. There are two types of junction temperatures available in this type of device, the standard 125°C and the 150°C version. These switches are available in current ratings of up to 16 A. The H series is another series of high immunity devices with a junction temperature of 150°C which can be used in higher ambient temperature applications or in applications where a smaller heat sink is desirable due to space constraints. The switch commutation is guaranteed at 150°C, with current ratings up to 30 A. Next is the standard family of Triacs; the BTA is an isolated package, BTB is non-isolated. These switches have a standard junction temperature of 125°C, with current ratings up to 40 A. The T series is a family of improved commutation and dV/dt rating-type Triacs which can be used in cost-sensitive applications because they are less expensive than the high-performance ACS switches at the top of the list. The T series switches are selectable also in 125°C and 150°C junction temperatures with current ratings up to 16 A.