The **LTCEC-1503-R/Q** is a high-precision, current-sense resistor (often referred to as a shunt resistor) typically used in power management and current monitoring circuits. --- ## 1. Technical Specifications Below are the primary electronic characteristics for this component series: | Parameter | Specification | | :--- | :--- | | **Type** | Current Sense Resistor (Metal Plate) | | **Resistance Value** | 150 mΩ (0.150 Ω) | | **Tolerance** | ±1% (F) or ±0.5% (D) depending on suffix | | **Power Rating** | 3 Watts (typical for 1503 series) | | **Package Code** | 1503 (1.5mm x 0.3mm or proprietary sizing) | | **Temperature Coefficient** | ±50ppm/°C to ±100ppm/°C | --- ## 2. Key Features * **Low Resistance:** Designed to measure current by creating a very small voltage drop without significant power loss. * **Thermal Stability:** Uses metal alloy technology to ensure the resistance does not drift significantly as the component heats up. * **High Power-to-Size Ratio:** Engineered to handle high wattage in a relatively small surface-mount footprint. * **AEC-Q200 Compliance:** The "Q" suffix usually denotes automotive-grade qualification, meaning it is tested for high vibration and extreme temperature cycles. --- ## 3. Component Breakdown (Code Meaning) While naming conventions vary slightly by manufacturer (such as LIZ Electronics or similar), the code generally breaks down as follows: 1. **LTC:** Series prefix (Low TCR Current Sense). 2. **EC:** Material/Construction code (Metal Plate/Epoxy Coating). 3. **1503:** Physical dimensions (Package size). 4. **R/Q:** * **R:** Standard reel packaging. * **Q:** Automotive Grade (AEC-Q200) certification. --- ## 4. Typical Applications * **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in lithium batteries. * **DC-DC Converters:** Providing feedback for current-mode control loops. * **Motor Control:** Detecting overcurrent conditions in industrial or automotive motors. * **Power Supplies:** Serving as a precision shunt for digital power monitoring. ---