680PF 2kv Dip Ceramic Capacitor

If your board needs a 680pf 2kv ceramic disc capacitor, and the old part is a 2kV disc marked 681, this is the part to order. Read the code first: 681 does not mean 681 picofarads. Under the standard 3-digit code, 681 means 68 followed by one zero in picofarads — 680 pF, which is 0.68 nF or 0.00068 µF. So this is a 680 pF disc capacitor rated at 2kV (2000V DC), in a through-hole DIP disc body, built for filtering, coupling, and voltage regulation in high-power circuits. It fits solar inverters and power electronics that need a fixed 680 pF value at up to 2kV. It does not fit jobs that need a different capacitance value, a lower voltage rating, or a surface-mount body. Check the checks below before you order, so the value, the voltage, and the body all match your board.

This is an original, high-quality part.

What it does

A capacitor stores electrical energy and releases it again. A ceramic disc capacitor does that job with a ceramic disc as the insulator between two metal layers, which gives a small, tough part for filtering and smoothing work. This 680pf disc capacitor holds 680 pF within 10%, so a board that calls for 680 pF gets between 612 and 748 pF. In a circuit it works as a 680pf 2kv capacitor for filtering, where it lets the wanted signal pass and blocks the noise, and for coupling, where it passes the signal from one stage to the next while blocking the DC level. The 2kV rating is what sets it apart from the low-voltage discs used on logic boards — it can stand across a high-voltage stage without damage, as long as the voltage limits below are respected.

Repair techs use a part like this as a 680pf 2kv ceramic disc capacitor for filtering, coupling, and voltage regulation in solar inverters and power electronics, and for protecting circuits from transient surges, where it soaks up the short voltage spikes that would disturb the next stage. It is a through-hole disc, so it mounts through holes on a board with two radial leads, not on the surface. The disc body is small and the part is non-polar, so it fits either way round — there is no positive or negative lead to get wrong.

Key features

• 680 pF (0.68 nF) capacitance — code 681 = 680 pF
• 2kV (2000V DC) rated voltage
• ±10% tolerance
• Ceramic disc construction, radial leads, through-hole (DIP) mounting
• Non-polar — fits either way round
• Lead spacing about 12.5 mm
• For filtering, coupling, voltage regulation, and transient surge protection

Checks before you order

• Value — read the code: your board list must call for 680 pF (0.68 nF), which is the part marked 681. If your board list calls for 681 picofarads, that is a different part — stop and check the board list again. The code 681 is 680 pF, not 681 pF.
• Voltage: the voltage across this part must stay at or below 2kV DC. Above 2kV this part is the wrong pick — a higher-voltage disc is a different job, not a swap. Never fit a low-voltage disc in a 2kV stage: a 50V 104-code ceramic disc capacitor is a low-voltage disc for a different board, not a swap for this one.
• Tolerance: the real value may sit up to 10% away from 680 pF, so between 612 and 748 pF. If your circuit needs tighter than 10%, this part is the wrong pick — do not hope the part you get sits near the middle.
• Body and fit: your board must take a through-hole disc body with two radial leads, about 12.5 mm apart. Measure the old part and match it against the holes and the space on your board. If the spacing does not match, check the board list again before you order.
• Fit for the job: this part suits filtering, coupling, and voltage regulation in high-voltage circuits. If your job needs a polarised capacitor or a much larger value for bulk energy storage, this disc is the wrong pick — a 50V 10uF electrolytic capacitor is a different type for a different job, not a swap for this one.

Specifications

All figures below are from the high-voltage ceramic disc series documents and the live page’s own spec. No figure here was guessed. The maker and the dielectric of the exact part on this page are not stated on the live page, so the publisher should confirm the series figures against the Download file at publish time (see the gates note). No temperature range and no body size are claimed, because neither is fixed for the stocked part by the documents.

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 680pf is the plain name from its value. 680pf 2kv capacitor is the name buyers use when the full rating matters. Ceramic disc capacitor is the name for its construction type. 2kv capacitor is the short name buyers use when the voltage is the key point. 681 capacitor is the name from the code printed on the part — but remember it means 680 pF, not 681 picofarads. If your board list calls for 680 pF at 2kV in a disc body, this page is the right match. Do not judge by the code alone — check the true value and the voltage too.

Frequently Asked Questions

What does 681 mean on a capacitor?

It means 680 picofarads, which is 0.68 nF or 0.00068 µF. The first two digits are the value (68) and the third digit is the number of zeros to add (one), all in picofarads: 68 followed by one zero is 680 pF.

What does 2kV mean?

It is the rated voltage: 2 kilovolts, or 2000V DC — the most DC voltage the part is built to take across it in normal use. Keep the working voltage at or below 2kV with room to spare. Above that, this part is the wrong pick.

Is this capacitor polarised?

No, a ceramic disc capacitor is non-polar, so it has no positive or negative lead and fits either way round on the board. Do not mix it up with an electrolytic capacitor, which is polarised and must be fitted the right way round.

Can I use a lower-voltage disc, like a 50V disc, in a 2kV circuit?

No. A disc rated for 50V can fail if it sees 2kV across it. Always match or exceed the voltage your circuit needs, and check the body still fits your board.

How do I fit a ceramic disc capacitor?

Push the two leads through the matching holes on the board and solder them. Check the spacing of the holes against the lead spacing (about 12.5 mm) before you solder, and keep the disc clear of parts that cannot take heat.

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 680PF 2kV DIP ceramic capacitor for precise capacitance and stability in power electronics including solar inverters, with a DIP design for easy integration into circuit boards, for filtering, coupling, and voltage regulation in high-power systems, managing voltage fluctuations, improving power conversion efficiency, and protecting circuits from transient surges, for consistent performance and longevity in renewable energy applications — and that use still stands.