The **C0805Y393DZGALTU** is a high-reliability surface-mount Multilayer Ceramic Capacitor (MLCC) manufactured by **KEMET**. It belongs to the **KPS (KEMET Power Solutions)** series, specifically designed for harsh environments and automotive applications. --- ## 1. Technical Specifications Below is a breakdown of the core technical parameters for this component: | Parameter | Specification | | :--- | :--- | | **Part Number** | C0805Y393DZGALTU | | **Capacitance** | 0.039 µF (39 nF) | | **Case Size (EIA)** | 0805 (2012 Metric) | | **Voltage Rating (DC)** | 250 V | | **Dielectric** | C0G (NP0) - Ultra-Stable | | **Tolerance** | ±0.5 pF (Note: Typically "D" refers to small pF values, check specific series datasheet for 39nF tolerance) | | **Operating Temperature** | -55°C to +125°C | | **Termination** | Flexible Termination (Floating Electrode) | --- ## 2. Key Features and Construction ### A. Floating Electrode Design (FE-CAP) The "Y" in the part number signifies **KEMET’s Floating Electrode** technology. * **Mechanism:** It uses a cascaded electrode design which essentially places two capacitors in series within a single device. * **Safety:** If the capacitor develops a mechanical crack due to board flex, it is much less likely to result in a short circuit. This "fail-safe" mode prevents catastrophic failures in power lines. ### B. C0G (NP0) Dielectric * **Stability:** C0G is a Class I material. It shows no change in capacitance with respect to time and voltage. * **Temperature Coefficient:** The capacitance change is limited to ±30 ppm/°C across the entire temperature range. ### C. AEC-Q200 Qualified The "AU" suffix indicates it is **Automotive Grade**. It has undergone rigorous stress testing to meet the quality standards required for automotive under-the-hood or safety systems. --- ## 3. Part Number Breakdown (KEMET Naming Convention) | Code | Meaning | | :--- | :--- | | **C** | Ceramic | | **0805** | Case Size (0.08" x 0.05") | | **Y** | Floating Electrode / Low ESR / High Reliability | | **393** | Capacitance Code (39 followed by 3 zeros = 39,000 pF or 39 nF) | | **D** | Capacitance Tolerance (Standard code, check specific series for nF variance) | | **Z** | Failure Rate Designator | | **G** | Voltage Rating (250 V) | | **A** | Dielectric (C0G/NP0) | | **L** | Termination Finish (Tin) | | **TU** | Packaging (7" Reel / Marked) | --- ## 4. Typical Applications * **Automotive Electronics:** Airbag control units, engine sensors, and infotainment. * **Power Supplies:** Input/Output filtering in DC-DC converters where high reliability is paramount. * **High-Flex Circuits:** Applications where the PCB might be subject to bending or vibration. ---