The **AD8505ARJZ-R2** is a high-precision, micropower operational amplifier (op-amp) manufactured by Analog Devices. It is specifically designed for portable and battery-powered applications where power consumption and space are critical. --- ## 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Supply Voltage Range** | 1.8V to 5.5V | | **Supply Current** | ~20 μA maximum | | **Input Offset Voltage** | 3 mV (typical) | | **Output Type** | Rail-to-Rail Input/Output (RRIO) | | **Package Type** | SOT-23-5 | | **Operating Temperature** | -40°C to +125°C | | **Unity Gain Bandwidth** | 95 kHz | --- ## 2. Core Features ### Micropower Consumption The AD8505 is optimized for extremely low power draw. Consuming only about 20 microamps, it is ideal for devices that must remain "always on" or run for years on a single coin-cell battery. ### Rail-to-Rail Input and Output This feature allows the input and output signals to swing very close to the supply rails (V+ and Ground). This maximizes the dynamic range, which is essential when working with low-voltage power supplies like 1.8V. ### Low Input Bias Current With very low input bias current (typically in the picoampere range), this op-amp is excellent for high-impedance sensor interfaces, such as photodiode amplifiers or pH probes. --- ## 3. Typical Applications * **Portable Medical Devices:** Glucose meters, pulse oximeters, and heart rate monitors. * **Remote Sensors:** IoT sensor nodes and wireless transmitters where battery life is paramount. * **Battery Monitoring:** Precision current sensing and voltage monitoring in mobile electronics. * **Active Filters:** Low-frequency filtering in audio or sensor signal conditioning. --- ## 4. Pin Configuration (SOT-23-5) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | OUT | Output of the amplifier | | 2 | V- | Negative power supply (or Ground) | | 3 | +IN | Non-inverting input | | 4 | -IN | Inverting input | | 5 | V+ | Positive power supply | --- ## 5. Ordering Information Meaning The suffix **ARJZ-R2** provides specific details about the packaging: * **ARJZ:** Indicates the package type (SOT-23) and lead-free status. * **R2:** Refers to the "Reel" size, specifically a 7-inch reel containing 250 units (standard for prototyping or small production runs).