474J/630V Polypropylene Film Capacitor

If your board needs a 474j 630v film capacitor, and the old part is a 0.47 µF CBB21 film part rated at 630V DC, this is the part to order. It is a 474j 630v capacitor in a radial box body, built as a metallized polypropylene film capacitor for filtering, coupling, and energy storage in high-voltage DC circuits where a low-voltage part would fail. It fits solar inverters, DC-DC converters, and high-frequency circuits that need a fixed 0.47 µF value at up to 630V DC.

It does not fit jobs that need a different capacitance value, a higher voltage rating, an X2 safety capacitor across the mains, or a surface-mount body. Check the checks below before you order, so the value, the voltage, the tolerance, 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 polypropylene film capacitor does that job with a thin plastic film as the insulator, which gives low loss and high stability for DC and pulse work. This CBB21 capacitor holds 0.47 µF within 5%, so a board that calls for 0.47 µF gets between 0.4465 and 0.4935 µF. The 630V DC rating is what sets it apart from the low-voltage film capacitors used on logic boards — it can stand across a high-voltage DC stage without damage, as long as the voltage limits below are respected. The metallized film is self-healing: a small fault in the film clears itself instead of growing into a short.

Repair techs use a part like this as a 474j 630v film 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. It also fits energy storage in solar inverters and DC-DC converters, where it holds charge and releases it to smooth the voltage, and DC-link and resonance circuits, where a stable high-voltage value matters.

Key features

• 0.47 µF capacitance (470 nF) — code 474 = 470,000 pF
• ±5% tolerance (J)
• 630V DC rated voltage
• Metallized polypropylene film (CBB21), self-healing
• Low loss: dissipation factor ≤0.001 at 1 kHz
• Wide temperature range: −40°C to +105°C (series figure — see the gates note)
• Radial box body, through-hole mounting

Checks before you order

• Value — read the code: your board list must call for 0.47 µF (470 nF), which is the part marked 474J. If your board list calls for 474 picofarads, that is a different, far smaller part — stop and check the board list again. The code 474 is 470,000 pF, not 474 pF. A 206K 350VAC 20uF box capacitor is a much larger AC film part for a different job, not a swap for this one.
• Voltage — DC, not AC mains: the voltage across this part must stay at or below 630V DC. This is a DC film capacitor, not an X2 safety capacitor — never use it across the mains in place of an X2 part. A 50V 1uF SMD capacitor is a low-voltage ceramic part for a different job, not a swap for this one.
• Tolerance: the real value may sit up to 5% away from 0.47 µF, so between 0.4465 and 0.4935 µF. If your circuit needs tighter than 5%, 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 radial box body with two leads. Measure the old part and match it against the holes and the space on your board. The live page states a 20 mm lead spacing — if your old part has a different spacing, check the board list again before you order. No body size is stated on this page, so measure the old part rather than guessing from the value alone.
• Fit for the job: this part suits DC filtering, coupling, and energy storage in high-voltage DC circuits. If your job needs a safety capacitor across the mains or a much larger value for bulk energy storage, this part is the wrong pick — match the board list exactly.

Specifications

All figures below are from the CBB21 series document for this film capacitor family, except the lead spacing, which is the live page’s own figure. No figure here was guessed. The maker of the exact part on this page is 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 body size is claimed, because neither the live page nor the series document gives one for this value.

Other names for the same part (good to know)

Shoppers and repair techs call this same part by a few names. 474j 630v is the plain name from its code and its voltage. 474j 630v film capacitor is the name buyers use when the construction matters. Polypropylene film capacitor is the name for its dielectric type. CBB21 capacitor is the name for its series — the stocked part is a CBB21 part. 630v film capacitor is the short name from its voltage rating. If your board list calls for 0.47 µF at 630V DC in a CBB21 box body, this page is the right match. Do not judge by value alone — check the voltage, the tolerance, and the safety class too.

Frequently Asked Questions

What does 474J mean?

It means 0.47 µF with ±5% tolerance. Under the standard 3-digit code, 474 means 47 followed by four zeros in picofarads — 470,000 pF, which is 0.47 µF or 470 nF. The letter J means the tolerance is ±5%.

What does 630V mean — is it AC or DC?

It is 630V DC: the most DC voltage the part is built to take across it in normal use. Keep the working DC voltage at or below 630V with room to spare. Above that, this part is the wrong pick. Do not use it as a 630V AC part.

Is this an X2 capacitor?

No. This is a CBB21 DC film capacitor, not an X2 safety capacitor. An X2 part is built and tested to sit across the mains for EMI suppression. This part must never take the place of an X2 part across the mains — match the safety class as well as the value and the voltage.

What does self-healing mean?

It means the metallized film can clear a small fault by itself: if a tiny weak spot in the film breaks down, the thin metal layer around it burns away and seals the fault, instead of the fault growing into a short. That is why this type lasts long in DC and pulse work.

How do I fit a box film capacitor?

Push the two leads through the matching holes on the board and solder them. Check the lead spacing against the holes before you solder — the live page states 20 mm, so measure the old part rather than guessing from the value alone. Keep the box 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 474J/630V metallized polypropylene film capacitor for stable power delivery in solar inverters and other power circuits, with a 474J (0.47uF) capacity and a 630V rating, for filtering, energy storage, and noise suppression in high-frequency circuits, for DC-link circuits and resonance circuits in solar inverters, with metallized polypropylene film giving low power loss, self-healing, high durability, and heat resistance, for power supplies, inverters, and energy conversion systems — and that use still stands.