EEVFK1J221Q

The EEVFK1J221Q is a surface-mount aluminum electrolytic capacitor from Panasonic’s EEV-FK series, a high-performance line of SMD aluminum electrolytics engineered specifically for demanding automotive and industrial applications. As part of Panasonic’s extensive capacitor portfolio, the FK series is known for its high ripple current capability, low equivalent series resistance (ESR), long operating life, and AEC-Q200 automotive qualification — making it suitable for environments where reliability under harsh temperature and vibration conditions is critical. This particular device offers 220 microfarads of capacitance with a 63 volt DC rating in a compact 10mm × 10.2mm (diameter × length) surface-mount package, providing substantial energy storage and filtering capability for its size. The FK series uses an optimized aluminum electrolytic construction featuring a high-purity etched aluminum foil anode, a paper separator impregnated with a specialized electrolyte formulation, and a cathode foil wound into a cylindrical element and housed in a sealed aluminum can with rubber end seals and epoxy reinforcement. The internal construction is designed to maximize ripple current handling while maintaining long life. A key performance characteristic is the high ripple current rating of 1.1 A rms at 105°C and 100 kHz, which allows the capacitor to handle significant AC current components associated with switching power supplies and DC-DC converters without excessive internal heating. The low ESR of 60 milliohms (typical) contributes to efficient ripple filtering and low power dissipation. The 2000-hour life rating at 105°C (with rated ripple current applied) translates to much longer operational life at lower temperatures — approximately 15 to 20 times longer at 85°C, per the standard 10-degree doubling rule for electrolytic capacitors. The AEC-Q200 qualification ensures the device meets the rigorous automotive passive component qualification standards including thermal shock, vibration, and load life testing. Packaged in tape-and-reel for automated SMT assembly and RoHS compliant, the EEVFK1J221Q is an excellent choice for input and output filtering in automotive electronics, industrial power supplies, DC-DC converters, switching regulators, and other high-reliability power applications.

An aluminum electrolytic capacitor operates on the principle of anodic oxidation to form the dielectric layer. The capacitor consists of two aluminum foils separated by a paper spacer, all rolled (wound) into a cylindrical element and impregnated with a liquid or gel electrolyte. The anode foil is the positive electrode; it is etched to greatly increase its effective surface area (by a factor of 50-200 depending on voltage rating), and then anodized — subjected to an electrochemical process that forms a thin layer of aluminum oxide (Al₂O₃) on the foil surface. This aluminum oxide layer serves as the dielectric, with a typical breakdown field strength of about 1 V per nanometer of thickness. The cathode foil is the negative electrode; it is also etched for increased surface area but does not have a formed oxide layer (or has a very thin one). The paper separator, impregnated with electrolyte, physically separates the anode and cathode foils while providing ionic conductivity. The electrolyte serves as the true cathode of the capacitor — it makes electrical contact with the cathode foil and provides the ionic conduction necessary for the capacitor to function. Because the dielectric (aluminum oxide) is very thin (tens to hundreds of nanometers) and the effective electrode area is very large (due to etching), aluminum electrolytic capacitors achieve extremely high capacitance per unit volume compared to other capacitor types. However, this comes with trade-offs: they are polarized (the anode must always be at a higher voltage than the cathode), have relatively high ESR compared to ceramic or film capacitors, and are limited in their high-frequency performance. The EEVFK1J221Q, as an SMD chip type, has the wound element housed in an aluminum can with a sealed bottom, and the leads are formed into surface-mount terminations at the bottom of the can. The rubber seal at the bottom prevents electrolyte loss while allowing for pressure relief if the capacitor fails. When voltage is applied with correct polarity, the oxide dielectric on the anode foil blocks DC current flow while allowing the capacitor to store charge (energy is stored in the electric field across the dielectric). In power supply filtering applications, the capacitor charges during voltage peaks and discharges during voltage dips, effectively smoothing out ripple voltage. The ripple current (AC component) flows through the capacitor’s ESR, generating heat (I²R power loss) — the FK series’ low ESR and high ripple current rating means it can handle higher ripple currents with less temperature rise, contributing to longer life and higher reliability. Life expectancy of aluminum electrolytic capacitors follows Arrhenius behavior: roughly doubling for every 10°C decrease in operating temperature, making derating (operating below the rated voltage and temperature) an effective way to extend service life.

The EEVFK1J221Q is a 2-terminal surface-mount polarized aluminum electrolytic capacitor in a cylindrical chip package.

Package Dimensions:

• Case Diameter (D): 10.0 mm
• Body Length (L): 10.2 mm
• Termination Style: Bottom-mount SMD pads
• Polarity Marking: Cathode side marked with stripe/band on aluminum can
• Mounting: Surface mount technology (SMT), reflow solder compatible
• Packaging: Tape and reel (standard for automated assembly)

Soldering & Handling Notes:

• Compatible with standard reflow soldering processes
• Observe correct polarity — reverse voltage can cause catastrophic failure
• Do not apply voltage exceeding the 63 V DC rating
• Store in controlled humidity and temperature conditions
• Refer to Panasonic’s FK series datasheet for complete soldering profiles and handling recommendations

• Automotive Electronics: Used in automotive body electronics, infotainment systems, ADAS controllers, and under-hood power modules for input voltage filtering and bulk energy storage, with AEC-Q200 qualification ensuring reliability under automotive temperature cycling and vibration conditions
• DC-DC Converter Filtering: Deployed as input and output capacitors in buck, boost, and buck-boost DC-DC converters, providing bulk energy storage and ripple voltage filtering — the low ESR and high ripple current rating make them well-suited for switching converter topologies
• Switching Power Supplies (SMPS): Used in switch-mode power supplies for industrial, telecom, and consumer equipment as secondary-side output filter capacitors, handling the high ripple currents associated with high-frequency switching regulators
• Linear Voltage Regulators: Used as output capacitors for linear regulators (LDOs) to provide output voltage smoothing, improve transient response, and ensure regulator stability — the 63V rating supports higher voltage regulator outputs
• Industrial Power Supplies & Inverters: Deployed in industrial power supplies, variable frequency drives, and inverter systems where high-temperature operation, long life, and high reliability are required for continuous duty applications
• LED Drivers & Lighting: Used in AC-DC and DC-DC LED drivers for output current filtering and energy storage, supporting high-efficiency LED lighting applications including industrial and automotive lighting
• Motor Drive Circuits: Found in motor drive circuits for pumps, fans, and small motors as DC bus capacitors and ripple filters, handling the high ripple currents associated with motor drive switching
• Telecommunications Power Systems: Used in telecom power supplies, PoE (Power over Ethernet) equipment, and base station power systems where long life, high reliability, and stable performance are essential for 24/7 operation