## Z201 250R00 FB: Component Overview The **Z201 250R00 FB** is a high-precision, ultra-stable resistor manufactured by Vishay Precision Group (VPG), specifically from their **Z-Foil** technology series. These resistors are designed for applications where accuracy and stability under temperature changes are critical. ### 1. Part Number Breakdown | Segment | Meaning | Detail | | :--- | :--- | :--- | | **Z201** | Series Type | Ultra-High Precision Z-Foil Resistor (Through-hole). | | **250R00** | Resistance Value | **250.00 $\Omega$** (The 'R' acts as a decimal point). | | **F** | Tolerance | **±1.0%** (Though Z201 series often offers tighter tolerances like 0.005%). | | **B** | Bulk Packaging | Standard industrial bulk packaging. | --- ### 2. Technical Specifications The Z201 series is famous for its "Bulk Metal® Foil" technology, which offers performance superior to typical thin-film or thick-film resistors. | Parameter | Typical Specification | | :--- | :--- | | **Resistance Value** | 250 $\Omega$ | | **TCR (Temperature Coefficient)** | ±0.05 ppm/°C (0°C to +60°C) | | **Tolerance** | ±1.0% (standard for this specific suffix) | | **Power Rating** | 0.6 W at 70°C | | **Load Life Stability** | ±0.005% ΔR (after 2000 hours) | | **Rise Time** | 1.0 nanosecond (effectively non-inductive) | | **Operating Temp Range** | -55°C to +125°C | --- ### 3. Key Electronic Characteristics * **Ultra-Low TCR:** The Z-Foil technology minimizes the change in resistance caused by temperature fluctuations. This is vital for precision measurement equipment. * **Non-Inductive/Non-Capacitive:** The design uses a photo-etched circuit pattern that cancels out inductance, making it ideal for high-speed switching and high-frequency applications. * **Electrostatic Discharge (ESD) Immunity:** Unlike many electronic components, these resistors are highly resistant to ESD (up to 25 kV), ensuring reliability in harsh environments. * **Thermal Stabilization:** The part reaches thermal equilibrium almost instantly, preventing "drift" during initial power-up. --- ### 4. Common Applications Due to its high cost and high precision, the Z201 250R00 FB is typically used in: 1. **Metrology Labs:** Used as a secondary standard resistor. 2. **Medical Instrumentation:** Precision imaging and diagnostic tools. 3. **Aerospace & Defense:** Guidance systems and high-reliability satellites. 4. **Audio Equipment:** High-end "audiophile" grade amplifiers where signal purity is paramount. 5. **Precision Weighing Scales:** To maintain accuracy across different ambient temperatures. ---