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Internal thermal protection removes some of the con- st raints of power derating for abnormal operating condi- tions. The amplifier will protect itself for many codditions of excess power dissipation (see Power Derating Curve). This allows the use of a smaller heat sink to protect agai'nst abnormal output conditions since the amplifier has its own internal protection for many conditions of excess power dissipation. The output constraints of the Safe Operating Area Curves must still be observed. The 3571AM and 3572AM have several other features that improve their utility. For instance. the metal case of the units is completely electrically isolated. (This can be contrasted to most power semiconductors where the case is connected to the collector ofthe device.) This simplifies mounting and reduces cost because the need for insulating spacers and bushings is eliminated. The hermetically sealed package improves reliability and will withstand severe environments better than discrete component amplifiers. The small package size makes mounting more convenient.