The **FRTD-R-H2-R** is a specialized electronic component, typically categorized as a **Surface Mount Device (SMD) Platinum Resistance Temperature Detector (RTD)**. These parts are designed for high-precision temperature sensing in industrial and automotive applications. Below is a breakdown of its electronic characteristics and specifications. --- ### 1. Technical Specifications The part number typically follows a standard nomenclature for thin-film RTDs. | Feature | Specification (Typical) | | :--- | :--- | | **Element Type** | Pt1000 (Platinum Resistance) | | **Base Resistance** | 1000 $\Omega$ at 0°C | | **Temperature Coefficient** | 3850 ppm/K (Standard DIN/IEC 60751) | | **Tolerance Class** | Class B (F 0.3) or Class A (F 0.15) | | **Package Size** | SMD (likely 0805 or 1206 footprint) | | **Operating Range** | -50°C to +150°C (up to +175°C depending on coating) | --- ### 2. Internal Composition The FRTD-R-H2-R utilizes **Thin-Film Technology**, which involves the following layers: * **Ceramic Substrate:** High-purity Alumina ($Al_2O_3$) serves as the base. * **Platinum Layer:** A thin layer of platinum is sputtered onto the substrate and laser-trimmed to reach the exact 1000 $\Omega$ resistance. * **Passivation:** A glass or epoxy coating protects the platinum from moisture and contaminants. * **Termination:** Lead-free (Sn) plated contact pads for SMD soldering. --- ### 3. Key Electronic Characteristics * **Linearity:** Unlike Thermistors (NTC/PTC), this RTD offers a highly linear resistance-to-temperature curve, making calibration simpler. * **Stability:** Platinum is chemically inert, leading to extremely low "drift" over time compared to semiconductor sensors. * **Self-Heating:** Because it is an SMD part with low thermal mass, care must be taken with the excitation current (typically kept below 1mA) to avoid false temperature readings. --- ### 4. Circuit Implementation To read this sensor, it is usually placed in a **Wheatstone Bridge** configuration or a constant current source circuit. ```python # Simplified calculation for Resistance to Temperature def get_temp_from_res(R_measured, R0=1000): # Standard DIN coefficients A = 3.9083e-3 B = -5.775e-7 # Simple linear approximation for quick checks: # T = (R_measured - R0) / (R0 * Alpha) alpha = 0.003851 temp = (R_measured - R0) / (R0 * alpha) return temp ``` ---