1. Supply Current (150 nA vs. 2.5 µA): The PS081FN features extremely low power consumption, only 1/16 that of the PS09FN. It is specifically designed for battery-powered, power-critical long-term monitoring applications (e.g., wireless sensor nodes, implantable devices), enabling ultra-long standby times. The power consumption level of the PS09FN is more suitable for general-purpose equipment with stable power supplies or batteries that can be replaced periodically. 2. Package & Pinout (56-QFN vs. 40-QFN): The higher pin count of the PS081FN typically indicates integration of more extensive analog front-end channels, digital interfaces (e.g., higher-resolution ADC, more programmable gain amplifiers), or more complex signal processing capabilities. The PS09FN, with fewer pins, likely offers a more streamlined or highly integrated feature set, but this may come at the cost of reduced expandability and flexibility. This directly impacts system design complexity and sensor configuration capabilities. 3. Performance & Feature Trade-offs: The differences above fundamentally represent a trade-off between ultra-low power consumption and functional/performance completeness. The PS081FN prioritizes minimal power draw, which may involve compromises in certain areas such as dynamic range, sampling rate, or internal compensation features. Conversely, within its available power budget, the PS09FN may deliver superior signal chain performance or more comprehensive digital features (e.g., on-chip calibration memory, faster output data rates).