The **UTM1A331MPD** is a specific aluminum electrolytic capacitor manufactured by **Nichicon**. It belongs to the **TM series**, which is characterized by its high reliability and "Standard" grade for general-purpose applications but with a focus on specific voltage and capacitance requirements. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the UTM1A331MPD: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Nichicon | | **Series** | TM | | **Capacitance** | 330 µF | | **Rated Voltage (DC)** | 10 V | | **Tolerance** | ±20% (at 120Hz, 20°C) | | **Operating Temp Range** | -55°C to +105°C | | **Endurance (Lifetime)** | 2,000 Hours @ 105°C | | **Termination** | Radial Lead (Through-hole) | | **Dimensions** | 8.00mm Diameter x 11.50mm Length | | **Lead Spacing** | 3.50mm | --- ## 2. Key Features ### Bi-Polarized (Non-Polar) Design The "TM" series is a **bi-polarized** (non-polar) aluminum electrolytic capacitor. Unlike standard electrolytic capacitors that have a specific positive and negative terminal, this part can be used in circuits where the polarity may reverse or is unknown. ### Temperature Stability With an upper limit of **105°C**, this part is more robust than standard 85°C capacitors, making it suitable for environments with moderate heat dissipation. ### Compact Form Factor The 8mm x 11.5mm size allows it to fit into relatively dense PCB layouts while still providing a significant 330µF of capacitance. --- ## 3. Applications Because this is a non-polar capacitor, it is typically used in the following scenarios: 1. **Audio Signal Coupling:** Used in signal paths where a DC offset might fluctuate or where the polarity of the signal is not constant. 2. **Phase Correction:** Used in AC circuits or crossover networks in speakers. 3. **Reverse Voltage Protection:** Used in circuits where accidental battery reversal might occur, preventing the capacitor from exploding. 4. **Vertical Deflection Circuits:** Commonly found in older television or monitor circuits. --- ## 4. Part Number Breakdown Understanding the Nichicon nomenclature: * **UTM:** The Series name (Non-polar, 105°C). * **1A:** Voltage Rating (1A = 10 Volts). * **331:** Capacitance Code (33 + one zero = 330µF). * **M:** Tolerance (M = ±20%). * **PD:** Configuration/Packaging (Radial lead, bulk or specific lead forming).