A Y2 safety capacitor from Walsin comes in four ratings, and one digit in the part number tells them apart. For marine electronics buyers in Greece, Walsin lists 186 X1/Y2 disc parts, from 10 pF to 10 nF. A 4.7 nF brief returns 11 disc parts, all ±20%, and none is on our shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design engineer or technical buyer at a marine electronics maker, ship manager or retrofit house in Athens or Piraeus who is choosing a mains safety capacitor for a power supply, a drive or a filter. Walsin Technology (Walsin) is the manufacturer and the only line we are authorised for. We re-measured every count on 11 November 2026 from Walsin’s disc capacitor export, Walsin_DiscCap_ALL.xlsx (929 rows, 929 distinct part numbers), the S2 rows of the MLCC export, and our stock list as at 23 September 2026. Every part number is real.
What did Shipping Herald report about Greek newbuilding orders, and why does a capacitor buyer care?
Steady ordering. According to Shipping Herald on 29 October 2026, citing Naftemporiki, Greek shipowners placed 40 newbuilding orders in October 2026, excluding options: 12 bulk carriers, 12 tankers, 14 containerships and 2 gas carriers.
Earlier, on 5 October 2026, Greek City Times reported, citing Xclusiv Shipbrokers, that Greek interests had 1,003 vessels on order, about 16.7 percent of the global orderbook in those four sectors. Those are the reports’ figures, not ours. Our inference is narrow: every ship carries switch-mode supplies, drives and filters, and every mains-facing supply carries Y-class capacitors from line to earth. The ships are built abroad, but their specifications, spares and retrofits are often managed from Piraeus. We say nothing about what any owner or yard buys.
How many Walsin Y2 safety capacitor disc parts are there, and in which ratings?
One hundred and eighty-six, in four ratings. We counted the X1/Y2 rows in Walsin’s disc export: 57 rated X1 440 Vac / Y2 250 Vac, 57 rated X1 440 Vac / Y2 300 Vac, 23 automotive parts rated X1 440 Vac / Y2 300 Vac with 1,500 Vdc, and 49 rated X1 500 Vac / Y2 500 Vac with 1,500 Vdc.
All four ratings run from 10 pF to 10 nF, except the automotive group, which starts at 100 pF. The 186 parts sit in five series labels of the AC family, in four dielectrics: SL (63), YP or Y5P (53), YU or Y5U (38) and YV or Y5V (32). None of the 186 is on our stock list as at 23 September 2026. The UR column that carries these ratings mixes AC safety ratings with plain DC ratings across the 929 rows, a point we have published before.
How do you read the Y2 rating from a Walsin disc part number?
From the third character. We cross-tabulated the third character of all 186 X1/Y2 part numbers against the rating column and found a clean one-to-one map: 0 means X1 440 / Y2 250 Vac (57 parts), 1 means X1 440 / Y2 300 Vac (57), 5 means X1 500 / Y2 500 Vac with 1,500 Vdc (49) and 7 means the automotive X1 440 / Y2 300 Vac with 1,500 Vdc (23).
So YU0AC472M120, YU1AC472M120, YU5AC472M120 and YU7AC472M120 are the same 4.7 nF Y5U disc at four different ratings. We have not seen this mapping written down anywhere, including in the export. It holds on every one of the 186 rows we hold; it is our reading, not a Walsin ordering key, so confirm it against Walsin’s datasheet before you build a filter on it.
Which Walsin parts cross a 4.7 nF X1/Y2 disc brief?
Eleven, all ±20%. We filtered the 186 X1/Y2 parts for 4.7 nF and found 11: 7 in Y5U and 4 in Y5V, across all four ratings and five series labels. None is on our shelf.
The last column is for your incumbent.
| Walsin part | Rating in the export | Dielectric | Series label | Match / mismatch with a 4.7 nF, X1 440 / Y2 300 Vac, ±20% brief | Your incumbent |
|---|---|---|---|---|---|
YU1AC472M120 |
X1 440 Vac / Y2 300 Vac | Y5U | AC series | Match on value, rating and tolerance | |
YU1AC472M100 |
X1 440 Vac / Y2 300 Vac | Y5U | AC series, small size | Match; smaller body code | |
YV1AC472M100 |
X1 440 Vac / Y2 300 Vac | Y5V | AC series | Match on rating; mismatch in dielectric (Y5V) | |
YU0AC472M120 |
X1 440 Vac / Y2 250 Vac | Y5U | AC series | Mismatch: Y2 rating 250 Vac | |
YU5AC472M120 |
X1 500 Vac / Y2 500 Vac, 1,500 Vdc | Y5U | AC series 500 V | Mismatch above the brief: Y2 500 Vac rating | |
YU7AC472M120 |
X1 440 Vac / Y2 300 Vac, 1,500 Vdc | Y5U | AC series Auto | Match on rating; automotive label |
A match is a match on the export fields. The Lead Spacing column is empty on all 929 disc rows, so the footprint cannot be checked from the export at all. Confirm against both datasheets and the certificate, and qualify in your own circuit. Our post on X1/Y1 versus X1/Y2 safety capacitors explains the classes; the disc capacitor range lists the families.
Is there a surface-mount Y2 safety capacitor in the Walsin range?
Yes, the S2 MLCC series. Walsin’s S2 series holds 165 distinct part numbers in 1808, 1812, 2211 and 2220; at 4.7 nF there are three, all 2220 X7R, such as S255B472K502. Two S2 lines are on our shelf: S242B102K502 (1 nF, 1808) and S252B222K502 (2.2 nF, 2211).
The S2 rated-voltage column reads 5,000 or 6,000 Vdc, which is the impulse voltage, not the working voltage. Walsin’s S2 approval sheet, which we hold, gives the working rating as X1 310 Vac / Y2 250 Vac and 1,500 Vdc. So an S2 part is a Y2 250 Vac part, and it does not match a Y2 300 Vac brief. We hold the S2 certificates and send them on request.
What will we not tell you about marine power electronics?
Whether a part meets a classification society’s rules. Of the 28 Walsin datasheets we hold, none is for a disc capacitor and none names a marine or classification approval, so every disc figure here is an export reading.
We do not know your supply voltage, your earthing scheme or your class society’s requirements. We hold no ISO 9001 or IATF 16949 certificate. We hold no office, entity or stock in Greece; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or conformity advice; confirm with your compliance team.
How can Venatech help a Greek marine electronics buyer?
How Venatech helps starts with a free paste box. The cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts. Paste up to 500 part numbers, or an Excel or CSV file, use the safety-certified filter, and each Walsin candidate comes back with every field marked match or mismatch. Load a whole BOM for a review; the ready stock list is a Hong Kong snapshot dated 23 September 2026.
Our worked example: the 4.7 nF X1/Y2 brief returned 11 disc parts across four ratings, and the third digit told them apart. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots, and you request a quote through the site.
The short version
- Walsin lists 186 X1/Y2 disc parts in four ratings: Y2 250, 300, 300 automotive and 500 Vac.
- The third character of the part number maps one-to-one to the rating: 0, 1, 7 and 5.
- A 4.7 nF brief returns 11 disc parts; none is on our shelf.
- S2 surface-mount parts are Y2 250 Vac; their export voltage is the impulse figure.
Paste your safety capacitor lines into the free cross-reference tool and see every field marked match or mismatch. Qualification stays with you.
Frequently asked questions
What did Shipping Herald report about Greek orders in October 2026?
On 29 October 2026, citing Naftemporiki, it reported 40 newbuilding orders by Greek owners in October, excluding options: 12 bulk carriers, 12 tankers, 14 containerships and 2 gas carriers. These are the report’s figures, not ours.
How many Walsin Y2 safety capacitor disc parts are there?
186 in our export: 57 at Y2 250 Vac, 57 at Y2 300 Vac, 23 automotive at Y2 300 Vac and 1,500 Vdc, and 49 at Y2 500 Vac. Counted on 11 November 2026.
How do I tell the Y2 rating from a Walsin disc part number?
In our reading of all 186 rows, the third character maps to the rating: 0 is Y2 250 Vac, 1 is Y2 300 Vac, 5 is Y2 500 Vac and 7 is the automotive Y2 300 Vac. Confirm with Walsin’s datasheet.
Which Walsin disc part crosses a 4.7 nF, Y2 300 Vac brief?
YU1AC472M120 matches on value, rating and tolerance; YU1AC472M100 matches with a smaller body code. Confirm against both datasheets and the certificate, and qualify in your own circuit.
What is the working voltage of the Walsin S2 safety MLCC?
X1 310 Vac and Y2 250 Vac, with 1,500 Vdc, per Walsin’s S2 approval sheet. The 5,000 or 6,000 Vdc in the export is the impulse voltage, not a working rating.
Do you hold stock or an office in Greece?
No. We hold no office, entity or stock in Greece; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no legal or customs advice.
Related reading
- X1/Y1 versus X1/Y2 safety capacitors
- Walsin passive components from Hong Kong stock
- How to cross-reference an MLCC
- Free cross-reference tool and ready stock
Last reviewed 11 Nov 2026. Sources: Shipping Herald, “Greek shipowners maintain newbuilding momentum with 40 orders in October”, 29 October 2026 (https://www.shippingherald.com/greek-shipowners-maintain-newbuilding-momentum-with-40-orders-in-october/, fetched 11 Nov 2026); Greek City Times, “Greek Shipping Enters New Era as Ship Orders Surpass 1,000”, 5 October 2026 (https://greekcitytimes.com/2026/10/05/greek-shipping-enters-new-era-as-ship-orders-surpass-1000/, fetched 11 Nov 2026); Walsin disc capacitor and MLCC exports and Venatech stock list as at 23 September 2026, re-measured 11 Nov 2026.