The **ADR381ARTZ-R2** is a precision band gap voltage reference manufactured by Analog Devices. It is part of the ADR38x family, known for its high accuracy, low power consumption, and small footprint. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the ADR381ARTZ-R2: | Parameter | Specification | | :--- | :--- | | **Output Voltage ($V_{out}$)** | 2.500 V | | **Initial Accuracy** | ±5 mV (0.2%) | | **Temperature Coefficient** | 25 ppm/°C (Maximum) | | **Input Voltage Range** | 2.8 V to 18 V | | **Quiescent Current** | 120 µA (Maximum) | | **Output Current Capability** | +5 mA (Source) / -2 mA (Sink) | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | SOT-23-3 (Surface Mount) | --- ### 2. Core Features The ADR381 is designed for high-performance applications where space and power are critical. Its main features include: * **Low Dropout:** It requires a very small headroom between the input and output voltage (only 300mV). * **High Stability:** It maintains a steady 2.5V output despite changes in temperature or input voltage fluctuations. * **Wide Input Range:** While it outputs 2.5V, it can handle input spikes up to 18V, providing robust protection. * **No External Capacitor Required:** It is stable without an output capacitor, though one can be added to improve transient response. --- ### 3. Pin Configuration (SOT-23) The device uses a standard 3-pin configuration: | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **$V_{in}$** | Input Voltage Supply | | 2 | **$V_{out}$** | Reference Output Voltage (2.5V) | | 3 | **GND** | Ground | --- ### 4. Typical Applications Due to its precision and low power draw, the ADR381ARTZ-R2 is commonly found in: * **Data Acquisition Systems:** Providing a stable reference for ADCs (Analog-to-Digital Converters). * **Battery Powered Equipment:** Its low current consumption (120µA) extends battery life. * **Industrial Process Control:** Used in sensors and transmitters for precise signal scaling. * **Precision Instruments:** Handheld multimeters and calibration tools. --- ### 5. Part Number Breakdown Understanding the suffix `ARTZ-R2`: * **ADR381:** The base model (2.5V output). * **A:** Initial accuracy grade. * **RT:** Package designator (SOT-23). * **Z:** RoHS compliant (Lead-free). * **R2:** Reel size (typically indicates a 7-inch reel with 250 units).