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Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs — main product image
Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs
Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs
Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs
Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs
Panasonic

Panasonic FM Series Capacitors - 50V 220uf Low ESR 6pcs

★★★★★4.9 (40 reviews)

Drop-in low-ESR capacitors that cut impedance up to 70% versus standard electrolytics for cleaner power delivery.

$7.67*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Panasonic FM series (part number EEU-FM1H221) is a low-impedance aluminum electrolytic capacitor rated at 220µF and 50V, engineered for applications where power supply ripple and impedance directly affect performance — most notably audio amplifiers, DACs, and digital circuit power rails. The "low impedance" designation is not marketing language: Panasonic specifies 40% to 70% less impedance than their standard FC series at equivalent ratings. This translates to more efficient current delivery to the load, reduced voltage ripple at the power supply output, and lower thermal stress on the capacitor itself during operation. The 1650 mA ripple current rating is substantial for a 10 × 16mm radial capacitor, meaning these can handle the demands of Class AB amplifier power stages without approaching their thermal limits. Rated endurance is 4000 hours at 105°C, which — through the well-established Arrhenius doubling rule — projects to tens of thousands of hours at the 40-60°C temperatures found inside typical consumer audio equipment.

These capacitors are primarily purchased for recapping aging audio equipment — receivers, integrated amplifiers, and powered speakers where original electrolytic capacitors have drifted out of specification after 20-30 years of service. The 50V rating accommodates most solid-state audio power supply rails, though builders working with tube amplifiers should verify their B+ voltage doesn't exceed this rating. The standard 5mm lead spacing and 10 × 16mm dimensions fit the vast majority of through-hole PCB layouts without modification, though height clearance should be verified in compact chassis. Sold in a 6-piece pack, this quantity covers a typical stereo amplifier's main filter capacitors. For full-system recaps requiring additional values, supplementary purchases will be needed. As genuine Panasonic components from a well-documented product line, these offer a reliable, measurable upgrade path over generic or deteriorated original capacitors.

Key Features

Panasonic FM Series

Low Impedance (40 % to 70 % less than FC Series)

Endurance : 105 °C 2000 h to 7000 h

100% Authentic Panasonic made P/N EEU-FM1H221

10 x 16mm Lead spacing 5mm(0.394" x 0.689" 0.197")

Specifications

Manufacturer
Panasonic
Series
FM (Low Impedance)
Part Number
EEU-FM1H221
Capacitance
220 µF
Voltage Rating
50V
Impedance
Low (40%–70% Less Than FC Series)
Ripple Current
1650 mA
Temperature Rating
105°C
Endurance
4000 Hours at 105°C
Dimensions
10 × 16 mm (Diameter × Height)
Lead Spacing
5 mm
Quantity
6 pcs

Pros & Cons

👍 Pros

  • 40% to 70% lower impedance than standard FC series electrolytics delivers measurably cleaner power filtering in audio and digital circuits.
  • 1650 mA ripple current rating handles high-demand power supply stages without thermal stress or premature degradation.
  • 105°C temperature rating with 4000-hour endurance provides extended real-world lifespan well beyond consumer operating temperatures.
  • Standard 10 × 16mm radial form factor with 5mm lead spacing fits most PCB footprints without modification.
  • 6-piece quantity per pack provides enough units for a typical stereo amplifier power supply recap in a single purchase.

👎 Cons

  • 50V rating limits use to circuits operating below 50V — not suitable for higher-voltage tube amplifier power supplies without verifying rail voltages.
  • 10 × 16mm physical size may be taller than some original capacitors in compact or vintage equipment with tight board clearances.
  • Only available in 220µF at 50V in this listing — recapping a full amplifier typically requires multiple capacitance values, necessitating additional purchases.
  • 6-piece quantity may leave you short for larger projects like full receiver recaps that require 8-12 capacitors of the same value.

Frequently Asked Questions

The Panasonic FM series delivers 40% to 70% lower impedance than the FC series at the same capacitance and voltage rating. In audio circuits, lower impedance means the capacitor can supply current more efficiently to the amplifier's power stage, reducing ripple voltage and the audible hum or noise that comes with it. This is a measurable improvement in power supply filtering.
These FM capacitors handle 1650 mA of ripple current at 105°C. Ripple current is the AC component that flows through a filter capacitor in a power supply. A higher rating means the capacitor absorbs more AC noise without overheating, which directly extends its operational life and maintains cleaner DC output to your audio circuitry.
At 10mm diameter × 16mm height with 5mm lead spacing, these are a standard radial form factor. Verify that your existing capacitors match or are smaller than these dimensions and use the same lead pitch. The 50V voltage rating and 220µF capacitance must also match or exceed your original component's specs. Voltage can be higher than the original; capacitance should match the circuit design requirements.
Panasonic rates these at 4000 hours at 105°C. Since most consumer audio equipment operates well below 105°C — typically 40-60°C — the actual lifespan extends dramatically due to the Arrhenius relationship. At 60°C, you can expect roughly 60,000+ hours of service, which translates to many years of normal use.
Yes. These are authentic Panasonic FM series capacitors with the part number EEU-FM1H221. The FM series is a well-documented product line in Panasonic's catalog, and the specifications listed — impedance, ripple current, endurance, and dimensions — correspond to the official datasheet values.

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