The **Z201250R00DB** is a high-precision, ultra-stable resistor part of the **Z-Series** manufactured by **Vishay Foil Resistors** (now under the VPG Foil Resistors brand). This specific part uses **Bulk Metal® Z-Foil technology**, which is designed to provide the lowest temperature sensitivity in the industry. --- ### 1. Part Number Breakdown To understand the specific properties of the Z201250R00DB, we can deconstruct its nomenclature: | Segment | Value | Meaning | | :--- | :--- | :--- | | **Z201** | Model Series | Through-hole, high-precision Z-Foil resistor. | | **250R00** | Resistance | **250.00 Ohms**. | | **D** | Tolerance | **±0.5%** precision. | | **B** | Bulk Packaging | Standard bulk delivery packaging. | --- ### 2. Key Technical Specifications The Z201 series is renowned for its stability across varying environmental conditions. * **Technology:** Z-Foil (Improved version of the standard Bulk Metal Foil). * **Temperature Coefficient of Resistance (TCR):** * $\pm0.05 \text{ ppm/}^\circ\text{C}$ (typical from $0^\circ\text{C}$ to $+60^\circ\text{C}$). * $\pm0.2 \text{ ppm/}^\circ\text{C}$ (typical from $-55^\circ\text{C}$ to $+125^\circ\text{C}$). * **Power Rating:** 0.6 Watts at $70^\circ\text{C}$. * **Load Life Stability:** $\pm0.005\%$ (at $70^\circ\text{C}$ for 2,000 hours). * **Rise Time:** 1.0 nanosecond (effectively non-inductive). * **Noise:** -40 dB (virtually silent). --- ### 3. Advantages of Z-Foil Technology The Z201 series offers several benefits over standard thin-film or thick-film resistors: 1. **Thermal Stability:** Because it uses a specialized foil bonded to a ceramic substrate, it compensates for temperature changes via matched expansion coefficients. 2. **Electrostatic Discharge (ESD):** Capable of withstanding electrostatic discharges up to 25,000 Volts. 3. **Low Thermal EMF:** Minimizes the voltage generated by the junction of dissimilar metals, which is critical for low-voltage DC circuits. 4. **Non-Inductive/Non-Capacitive:** The etched pattern is designed to minimize internal inductance, making it suitable for high-speed signal processing. --- ### 4. Typical Applications Given its extreme precision and stability, this part is used in: * **Metrology:** Reference standards in calibration laboratories. * **Medical Imaging:** High-resolution MRI or CT scan signal paths. * **Aerospace/Defense:** Guidance systems and satellite instrumentation. * **Audio Equipment:** High-end "audiophile" grade pre-amplifiers where thermal noise must be eliminated.