The part number **CK45-R3AD331KAVRA** refers to a high-voltage ceramic disc capacitor manufactured by **TDK Corporation**. These components are primarily used for noise suppression, decoupling, and ballast circuits in power supplies. --- ### 1. Technical Specifications | Parameter | Value | | :--- | :--- | | **Capacitance** | 330 pF | | **Tolerance** | ±10% (K) | | **Rated Voltage** | 1000V DC (1kV) | | **Temperature Characteristic** | R (Low dissipation factor / High reliability) | | **Mounting Type** | Through-Hole (Radial Lead) | | **Lead Spacing** | 5.0 mm | | **Package/Case** | Disc (Resin coated) | --- ### 2. Part Number Breakdown Understanding the alphanumeric code helps identify the specific physical and electrical traits: * **CK45**: The series name (TDK High Voltage Ceramic Capacitors). * **R**: Temperature characteristic (stable performance across temperature shifts). * **3A**: Rated Voltage (3A corresponds to 1000V DC). * **D**: Lead shape/style (typically indicates a kinked lead for PCB standoff). * **331**: Capacitance code. The first two digits (33) are significant figures; the third digit (1) is the multiplier ($10^1$). Result: $33 \times 10 = 330$ pF. * **K**: Tolerance ($\pm 10\%$). * **A**: Lead spacing/dimensions code. * **V**: Internal factory/packaging code. * **RA**: RoHS compliance and standard environmental rating. --- ### 3. Key Applications Because this capacitor is rated for **1000V**, it is commonly found in the following environments: 1. **Switching Power Supplies (SMPS):** Used for snubber circuits to protect MOSFETs from voltage spikes. 2. **Lighting Ballasts:** Used in fluorescent and LED driving circuits. 3. **CRT Displays/TVs:** Handling high-voltage horizontal resonance. 4. **Surge Protection:** Acting as a filter to bypass high-frequency noise to the ground. --- ### 4. Handling & Safety * **Voltage Derating:** Always ensure the operating voltage does not exceed the 1kV rating. It is best practice to run the component at 50-70% of its rated voltage for long-term reliability. * **Polarity:** This is a **non-polarized** capacitor; it can be installed in either direction.