EEUFS1K471S - Panasonic

EEUFS1K471S Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for EEUFS1K471S to minimize ESR?
  Panasonic recommends a PCB layout with a large copper area for the capacitor pads, and a short and wide connection to the capacitor to minimize ESR. A 4-layer PCB with a solid ground plane is also recommended.
• How does the EEUFS1K471S behave under high-frequency conditions?
  The EEUFS1K471S is designed to operate up to 100 kHz, but its impedance may increase at higher frequencies due to the ESL (Equivalent Series Inductance). Panasonic recommends using impedance vs. frequency curves to determine the capacitor's behavior at specific frequencies.
• What is the derating curve for the EEUFS1K471S at high temperatures?
  Panasonic provides a derating curve in the datasheet, which shows the reduction in capacitance and voltage rating at high temperatures. For example, at 105°C, the capacitance is reduced to 80% of its nominal value, and the voltage rating is reduced to 80% of its nominal value.
• Can the EEUFS1K471S be used in a high-vibration environment?
  Yes, the EEUFS1K471S is designed to withstand vibrations up to 10G (10 Hz to 2000 Hz) and shocks up to 100G (11 ms). However, Panasonic recommends verifying the capacitor's performance in the specific vibration environment using vibration testing.
• What is the recommended soldering profile for the EEUFS1K471S?
  Panasonic recommends a soldering profile with a peak temperature of 260°C, a dwell time of 10-30 seconds, and a cooling rate of 2-4°C/second. The soldering process should be done in a nitrogen atmosphere to prevent oxidation.