The SAM4S series has been designed to achieve very low power in active and standby mode. So how low is low in terms of power efficiency and consumption? The SAM4S series manages to achieve 180 µA/MHz in active mode with a RAM retention mode below 25 µA, and 1 µA at 1.8 V in back-up mode with the real-time clock running. The SAM4S offers some of the best power consumption and performance rates on the market for standby mode, achieving 120 MHz operating frequency with a RAM retention mode below 25 µA.