100V 100uF aluminum electrolytic capacitor

If your board needs a 100v 100uf capacitor rated for 100V, and the old part is a radial aluminum electrolytic can, this is the part to order. It is a 100uF part for filtering and smoothing on DC lines where a high voltage must hold steady, so the circuit sees clean power instead of ripple. It does not fit circuits that run above 100V, or boards with no room for a 10 mm by 20 mm can with 5 mm lead spacing. Check the checks below before you order, so the value, the voltage, the size, and the polarity all match your board.

This is an original, high-quality part.

What it does

A capacitor stores charge, then lets it go when the circuit needs it. On a power supply board, a 100uF capacitor smooths the DC line after rectification, so the ripple — the small up-and-down wobble on the DC voltage — stays small. It also stores energy for short load changes, so a sudden demand does not drag the voltage down. That is why this value shows up in power supplies, solar inverters, and other high-voltage circuits.

This is an aluminum electrolytic capacitor. That construction gives high capacitance in a small can, but it also means the part is polarized: it has a positive side and a negative side, and it must go in the right way round. A ceramic capacitor has no polarity, but this part is not ceramic, so polarity matters here.

Key features

• 100uF capacitance for filtering and smoothing
• 100V rated voltage
• Aluminum electrolytic construction, radial lead type
• Capacitance tolerance ±20% (80 to 120 uF)
• Wide temperature range: −40 °C to +105 °C
• Can body: 10 mm diameter × 20 mm long, 5 mm lead spacing
• Polarized — match the marks on the part and the board
• Reduces voltage ripple and electrical noise on DC lines

Checks before you order

• Value: your board list must call for 100uF. If your list says a different value, stop and check again. A 50V 47uF part is a different value at a lower voltage for a different job, not a swap for this one.
• Voltage: the highest voltage on that line must stay at or below 100V. Above 100V, this part is the wrong pick. A 35V 470uF part is a different value at a much lower voltage, not a swap for this one.
• Polarity: this part is polarized. Match the polarity marks on the part to the marks on your board before you solder. A polarized part fitted the wrong way round will not work as planned and can fail.
• Size and lead spacing: the can is 10 mm across and 20 mm long, with leads 5 mm apart. Measure the space on your board and the distance between the board holes, and compare them with the part in hand before ordering. Do not guess the size from the value alone.
• Heat: this part is rated to +105 °C, but heat still ages electrolytic capacitors faster than any other factor. If the old part sat next to a hot heatsink, check the heat source too, or the new part will age the same way.
• Old-part check: if the old capacitor is bulged, leaking, or lifted at the top, replace it and check the parts around it as well. A failed capacitor is often a sign of heat or over-voltage nearby.

Specifications

All figures below are from the live page’s own spec block. No figure here was guessed. Ripple current, ESR, leakage current, and lifetime figures are not listed, because the maker and series of the stocked part are not stated on the live page — see the gates note.

Other names for the same part (good to know)

Shoppers and repair techs write this same part in a few ways. 100v 100uf capacitor is the plain name from its voltage and value. 100v 100uf electrolytic capacitor is the value-plus-voltage form used in board lists. 100uf capacitor is the short form most buyers type. Aluminum electrolytic capacitor is the construction name that sets this part apart from ceramic and film parts. 100v capacitor is the short name buyers use when the voltage is what matters most. All of these names point to the same part on this page: 100uF, 100V, radial aluminum electrolytic. If any one of those numbers is different, it is not this part.

Frequently Asked Questions

What does 100uF mean?

100uF is the capacitance: how much charge the part stores. A larger number means more charge storage, which means stronger smoothing on a power supply line.

Does this capacitor have a positive and negative side?

Yes. This is a polarized aluminum electrolytic capacitor, so it has a positive side and a negative side. Match the polarity marks on the part to the marks on your board before soldering.

Can I use this part above 100V?

No. 100V is the rated voltage for this part. A line that runs above 100V needs a part rated for that higher voltage, not this one.

Why does the size matter if the value and voltage match?

Because makers build this same 100uF 100V value in more than one body size. A part that is too tall or too wide will not fit the space on your board, and leads that do not match the board holes cannot be soldered in. Measure before ordering.

How do I know if my old capacitor has failed?

Common signs are a bulged or lifted top, leaking fluid at the base, or a power supply that hums, runs unstable, or shuts down under load. Test with a meter where you can, and check for heat or over-voltage nearby before fitting the new part.

What is the price of this part?

Check the live price on the website. The price shown on the product page is the current one.

Use note kept from the old page: this part was listed before as a high-performance 100V 100uF aluminum electrolytic capacitor for efficient energy storage and power regulation, giving stability and reliability in circuits that need high-voltage operation, for smooth voltage filtering in solar inverters and other high-power circuits, built with premium-quality materials for durability and long-term performance, handling voltage fluctuations and playing a part in energy conversion, and widely used in UPS, TV, VCD, speaker, digital camera, dishwasher, washing machine, and refrigerator circuits, with a note to take the required life, temperature, ripple current, and physical size into account before buying — and that use still stands.