The **EEFST0D331R** is a specific part number for a Surface Mount (SMT) Conductive Polymer Aluminum Solid Capacitor, manufactured by **Panasonic** (specifically under their **SP-Cap** line). --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the EEFST0D331R: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Panasonic | | **Series** | SP-Cap ST | | **Capacitance** | 330 µF | | **Voltage (Rated)** | 2.0 V | | **Tolerance** | ±20% | | **ESR (Equivalent Series Resistance)** | 12 mΩ (Very Low) | | **Case Code / Size** | 7343 (Metric) / D Case | | **Dimensions (L x W x H)** | 7.3mm x 4.3mm x 1.9mm | | **Operating Temperature** | -40°C to +105°C | --- ### 2. Key Features The EEFST0D331R belongs to the **ST Series**, which is known for several high-performance traits: * **Low ESR:** With a resistance of only 12 mΩ, it is highly efficient at handling ripple current and minimizing heat generation. * **Solid Polymer Electrolyte:** Unlike standard "wet" electrolytic capacitors, this uses a conductive polymer. This prevents drying out and ensures a longer lifespan and better stability over temperature changes. * **Low Profile:** At a height of 1.9mm, it is designed for slim electronic devices. * **High Ripple Current:** It can handle high-frequency current fluctuations, making it ideal for power smoothing. --- ### 3. Common Applications These capacitors are typically used in power management circuits where space is limited and stability is critical: * **Voltage Smoothing:** Used after a DC-DC converter to smooth out output ripples. * **CPU/GPU Power Rails:** Providing stable current to high-speed processors in laptops or servers. * **Telecommunications:** In base stations and networking hardware. * **Consumer Electronics:** High-end tablets and ultra-portable computers. --- ### 4. Comparison to Tantalum Capacitors The EEFST0D331R is often used as a safer alternative to traditional Tantalum capacitors: * **Safety:** Polymer capacitors do not have the "ignition" failure mode (fire risk) that some Tantalum capacitors exhibit when they fail. * **Performance:** They generally offer lower ESR than standard Tantalum parts.