EV Charger Electronics for China from Hong Kong: Shenzhen Reported 1,227 Ultra-Fast Charging Stations Above 480 kW, and Among 776 Walsin X7R Capacitors Rated 1 kV or More, the 1000 V 1812 Size Stops at 100 nF With 3 of 61 on the Shelf

EV charger electronics for China start with high-voltage ceramics, and the Walsin Technology (Walsin) catalogue holds 776 X7R capacitors rated 1 kV or more, excluding the safety series. At 1000 V the 1812 size stops at 100 nF, and our Hong Kong shelf holds only 3 of the 61 parts at that rating, as at 23 September 2026.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from the Venatech upload files for Walsin MLCC (23,360 rows, 23,360 distinct part numbers) and our stock list as at 23 September 2026. It is for a design or sourcing engineer at a Chinese maker of DC fast-charger power modules or charging-pile electronics who is choosing a 1 kV class ceramic. Every part number is real and every count is ours. The market fact names its source and the day we fetched it, 10 November 2026.

What did Shenzhen report about its ultra-fast charging network, and why does a component buyer care?

It reported more than a thousand very high-power stations. According to a Shanghai Metals Market news item dated 27 July 2026, Shenzhen had built 1,227 ultra-fast charging stations, each with power above 480 kW, plus 120 flash-charging stations for passenger vehicles and 48 ultra-fast charging and battery-swap stations for heavy trucks.

Those are the report’s figures, relayed from media coverage of 26 July, not ours. Our reading is ours: a 480 kW station is built from power modules, and every module carries ceramic capacitors at the DC bus, in snubbers and across isolation barriers, where the rating is in the kilovolt class. We have no relationship with any Shenzhen operator or charger maker and say nothing about what any of them buys.

How many Walsin X7R capacitors are rated 1 kV or more, and which series hold them?

Seven hundred and seventy-six, mostly in two series. We filtered the Venatech upload files for X7R parts with a rated voltage of 1000 V or higher, leaving out the S2 safety series whose export voltage is an impulse figure, and found 776 part numbers: 457 in Middle to High Voltage, 146 in Big Sizes, 141 in the SH soft-termination series, 13 in the ST automotive soft-termination series, 10 in SG and 9 in the MT AEC-Q200 series.

The S2 exclusion matters. Its export column carries 5000 V or 6000 V impulse figures, while the working voltage is a separate datasheet value, so counting those rows would overstate the 1 kV class. The automotive split is covered in our post on MT versus MG series, and the derating question sits in MLCC DC bias and voltage derating.

What is the largest X7R value at 1000 V in 1206, 1210 and 1812?

It rises with case size, from 22 nF to 100 nF. In the Venatech upload files, X7R parts rated exactly 1000 V number 110 in 1206 (largest 22 nF), 59 in 1210 (largest 47 nF) and 61 in 1812 (largest 100 nF); the hold-up is the shelf, which covers 9, 3 and 3 of them as at 23 September 2026.

A design that needs 100 nF at 1 kV in a standard footprint therefore has one size to choose, 1812, or a larger case: 1825 and 2220 also reach 100 nF at 1000 V. We have not seen this ladder counted anywhere else. The values on the shelf in 1812 are 3.3 nF, 5.6 nF and 6.8 nF, so a 100 nF line is a to-order enquiry, not a shelf pick.

Which Walsin parts cross a 47 nF, 1000 V, X7R, 1210, plus or minus 10 percent brief, and what differs?

One is a clean match and two are near misses. Of the three 47 nF, 1000 V, 1210 X7R parts in the export, only 1210B473K102 matches a plus or minus 10 percent, standard-termination brief on every field we hold.

The reader’s incumbent goes in the last column.

Walsin part	Description	On shelf 23 Sep 2026	Match / mismatch with the brief	Your incumbent
1210B473K102	Middle to High Voltage, 1210, X7R, 47 nF, plus or minus 10 percent, 1000 V	No	Match on size, dielectric, value, tolerance and voltage
1210B473M102	Middle to High Voltage, 1210, X7R, 47 nF, plus or minus 20 percent, 1000 V	No	Mismatch: tolerance is plus or minus 20 percent, wider
SH32B473K102	SH soft termination, 1210, X7R, 47 nF, plus or minus 10 percent, 1000 V	No	Match on the electrical fields; mismatch: termination is Ag-poly soft termination
1210B153K102	Middle to High Voltage, 1210, X7R, 15 nF, plus or minus 10 percent, 1000 V	Yes	Mismatch: value is 15 nF; the nearest shelf part, so two in parallel fall short
1812B682K102	Middle to High Voltage, 1812, X7R, 6.8 nF, plus or minus 10 percent, 1000 V	Yes	Mismatch: value and case size differ

A match in the table is a match on the export fields, no more. Confirm against both datasheets and qualify in your own circuit. The field-by-field method is in how to cross-reference an MLCC.

Do soft-termination twins exist at 1 kV, and what does the shelf hold?

Yes for most values, and the shelf holds few. Of the 776 X7R parts at 1 kV or more, 31 are on our stock list as at 23 September 2026, 30 of them in the Middle to High Voltage series and 1 in the Big Sizes series.

The SH series repeats many Middle to High Voltage values with a flexible termination, for example SH43B104K102 beside 1812B104K102 at 100 nF, which matters where board flex is a concern. None of the SH twins is on the shelf. The ready stock list is a dated snapshot, never live-synced, and the MLCC range lists the families. Our post on soft-termination MLCC explains what the extra termination layer does and does not change.

What will we not tell you about EV chargers?

Anything about your converter, your safety approval or your charging standard. Of the 28 Walsin datasheets we hold, none names an EV charger, so every count here is catalogue coverage, not suitability.

We make no claim that any part suits a charger, a creepage distance or an insulation class. We hold no ISO 9001 or IATF 16949 certificate. We give no legal, customs or conformity advice; confirm with your compliance team. Qualification stays with you.

How can Venatech help a Shenzhen charger designer?

How Venatech helps starts with a free paste box. The cross-reference tool, called VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts; paste up to 500 part numbers or an Excel or CSV file and each Walsin candidate returns 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.

Worked example from our own files: the 47 nF, 1000 V, 1210 brief returned 1 exact part among 3 at the value, none stocked. Venatech Limited is an authorised Walsin Technology distributor in Hong Kong; Stackpole and Viking are lines we supply. We serve from Hong Kong, welcome small lots, and you request a quote through the site.

The short version

For a Chinese charger designer, the 1 kV X7R question is a size and shelf question: 776 parts at 1 kV or more, a 100 nF ceiling at 1000 V in 1812, and 3 of 61 parts at that rating on the shelf. Name the voltage, the termination and the size, not just the value.

Send us one 1 kV capacitor line from your BOM, with the tolerance, termination and size you can accept, and we will return the Walsin parts with every difference stated. If your incumbent prints only 47 nF and 1 kV, do you know which termination you are buying?

Sources

Fetched 10 November 2026.

• Shanghai Metals Market news, Shenzhen builds 1,227 ultra-fast charging stations, each over 480 kW, 27 July 2026: https://news.metal.com/newscontent/104026713-shenzhen-builds-1227-ultra-fast-charging-stations-each-over-480-kw-capacity-citywide

Related reading

• MLCC DC bias and voltage derating
• Soft-termination MLCC: SH, SG, ST and VT
• AEC-Q200 MLCC: MT versus MG series
• Free cross-reference tool (VenaMatch)
• Ready stock, Hong Kong snapshot dated 23 September 2026

Last reviewed 10 Nov 2026.

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