High Q MLCC for 5G and 6G Base Stations in Vietnam (Hanoi): 30 Walsin 1.0 pF 0402 Parts From Venatech, Walsin’s Authorised Distributor in Hong Kong

For a high Q MLCC in a 5G or 6G base-station radio built in Vietnam, Walsin Technology (Walsin) lists 30 part numbers at 1.0 pF in 0402 across its HH, RF and UF series, 9 at plus or minus 0.05 pF or tighter and 50 V or more. Venatech, Walsin’s authorised distributor in Hong Kong, crosses them and holds two.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for an RF engineer in Hanoi or elsewhere in northern Vietnam who is laying out the matching and filter network of a radio unit and needs a small, stable, low-loss capacitor in the signal path. We parsed Walsin’s MLCC export, 00_ALL_MLCC_parts_combined.xlsx (24,026 rows, 23,601 distinct part numbers), and our stock list as at 23 September 2026. Every part number below is real and every count is ours, re-measured on 11 November 2026. The market statement names its source and the day we fetched it.

What did Viettel and Qualcomm announce for 6G in Vietnam?

A first pre-commercial 6G call by early 2029. According to TNGlobal on 20 July 2026, Viettel High Tech signed a 6G Platform Early Access Program agreement with Qualcomm Technologies, the first partner Qualcomm selected for that programme, and aims for a first pre-commercial 6G call by early 2029 on equipment Viettel researches, develops and manufactures itself.

The same report says Viettel has deployed 24,000 5G base stations nationwide and plans 20,000 more in 2026, and that Viettel High Tech researches and produces more than 15 percent of that equipment. Under the agreement Viettel handles research, design, integration, manufacturing and testing, while Qualcomm supplies the chipset platform. Those are TNGlobal’s figures, not ours. The conclusion we draw is ours: Vietnam now designs and builds radio hardware at home, and every radio board needs RF-grade capacitors. We have no relationship with Viettel or Qualcomm and say nothing about what either buys.

Why does a base-station radio need a high Q MLCC?

Because in the RF path, loss is the specification. A high Q MLCC is an NP0 (C0G) capacitor built for low ESR, the series resistance at radio frequency, so less of the signal turns into heat in a matching network, a filter or a coupling position; Walsin publishes 5,606 such part numbers across its HH, RF and UF series, a count we first published in our Johanson cross-reference.

A general-purpose NP0 part is stable in value but is not characterised for loss at gigahertz frequencies. In a power amplifier output match, a few tenths of a decibel lost per stage add up across a radio unit, and the heat lands on a tiny part. That is why RF designers specify a series rather than just a value. Tolerance matters as much: at 1.0 pF, plus or minus 0.25 pF is a 25 percent swing, enough to detune a matching network. Our guide to high Q, low ESR MLCC for RF explains the series in more depth.

Which Walsin 1.0 pF 0402 high Q MLCC parts cross a tight-tolerance RF brief?

Nine match on every export field. We filtered the HH, RF and UF rows of 00_ALL_MLCC_parts_combined.xlsx to 1.0 pF in 0402 and found 30 part numbers; 9 are plus or minus 0.05 pF or tighter and rated 50 V or more, the brief we set for a base-station match, and 1 of those is on our Hong Kong shelf.

The table shows the nine plus two near misses. Your incumbent goes in the last column.

Walsin part	Series	Tolerance	Rated voltage	Thickness (mm)	Match / mismatch with the brief	Your incumbent
RF15N1R0A500	RF	0.05 pF	50 V	0.50	Match, on our 23 September 2026 snapshot
RF15N1R0A101	RF	0.05 pF	100 V	0.50	Match
RF15N1R0A201	RF	0.05 pF	200 V	0.50	Match
RF15N1R0Q500	RF	0.03 pF	50 V	0.50	Match, tighter tolerance
HH15N1R0A500	HH	0.05 pF	50 V	0.50	Match
HH15N1R0A101	HH	0.05 pF	100 V	0.50	Match
UF15N1R0A500	UF	0.05 pF	50 V	0.50	Match
UF15N1R0Q500	UF	0.03 pF	50 V	0.50	Match, tighter tolerance
UF15N1R0P500	UF	0.02 pF	50 V	0.50	Match, tightest tolerance in the set
RF15N1R0B500	RF	0.1 pF	50 V	0.50	Mismatch: tolerance is wider; on our snapshot
HH15N1R0B160	HH	0.1 pF	16 V	0.50	Mismatch: tolerance wider and voltage lower

All 11 are 1.0 x 0.5 mm parts. A match here is a match on export fields, no more. Take Q and ESR at your frequency from Walsin’s own datasheets, which we hold as 06_Microwave_RF.pdf, 08_Microwave_Narrow_Tolerance_UF.pdf and 10_High_Q_Low_ESR_HH.pdf, and qualify in your own circuit.

How do the Walsin HH, RF and UF series differ on paper?

In size range, voltage range and tolerance. We counted 1,706 HH part numbers in 0201 to 0805 rated 10 V to 630 V, 3,615 RF part numbers from 01R5 to 1111 rated up to 1,500 V, and 285 UF part numbers in 0201 and 0402 rated 25 V to 100 V; every HH row is NP0.

For a Hanoi radio team, that reads as a choice by job. The RF series covers the widest spread of sizes and voltages, including 1111 parts for higher-power stages. The UF series is narrow but offers the tightest tolerance codes in our 1.0 pF set, down to plus or minus 0.02 pF. The HH series sits between them and reaches 0805. The Walsin MLCC range lists the families, and our page on the UF ultra-microwave series covers the narrow-tolerance end. We measured the counts ourselves from the export; the electrical comparison belongs to the datasheets.

What does Venatech hold in Hong Kong for RF and high Q MLCC?

89 lines across the three series. Of the 1,125 distinct part numbers on our stock list as at 23 September 2026, 89 are Walsin HH, RF or UF high Q MLCC, including RF15N1R0A500 and RF15N1R0B500 at 1.0 pF in 0402.

That gives a Vietnamese prototype or pilot build a quick start from Hong Kong while the production line is quoted. For the other 28 parts at 1.0 pF, request a quote and we source it through our authorised Walsin channel. The ready-stock list is a dated snapshot, never live-synced, and we give no lead time or stock promise.

What will we not tell you about a Vietnamese 6G radio design?

Anything about your band plan, your antenna or your approval. Our counts cover catalogue coverage only: 30 part numbers at 1.0 pF in 0402, 9 inside the brief, 2 on our shelf; none of it says a part suits your radio.

6G spectrum and component requirements are still being set, and the matching values come from your own simulation and network analyser. We hold no office or entity in Vietnam; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We hold no ISO 9001 or IATF 16949 certificate and give no legal, customs or radio-approval advice; confirm with your compliance team.

How Venatech helps: what can a Hanoi telecom hardware team send us?

A list of part numbers, in any maker’s format. Venatech is Walsin’s authorised distributor in Hong Kong, and our VenaMatch tool decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, with every field marked match or mismatch.

Paste up to 500 part numbers into the free cross-reference tool, or upload a whole BOM and request a quote. Filter for high Q / low ESR when you cross RF capacitors. The ready-stock list is a Hong Kong snapshot dated 23 September 2026. Worked example from our own export: a 1.0 pF, 0402, plus or minus 0.05 pF, 50 V brief returned 9 matches in 3 series, one held in Hong Kong. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots with fast quotes.

The short version

For a Vietnamese base-station radio, Walsin covers the high Q MLCC position in depth: 30 part numbers at 1.0 pF in 0402 alone, 9 of them at plus or minus 0.05 pF or tighter and 50 V or more, across three series. Venatech, Walsin’s authorised distributor in Hong Kong, holds 89 high Q lines on its 23 September 2026 snapshot.

Send us the RF capacitor lines from your BOM with value, tolerance and voltage, and we will return the Walsin parts with every difference stated. Which series is on your matching network today?

Related reading

• High Q, low ESR MLCC for RF
• The UF ultra-microwave MLCC series
• Passives for a telecom base station front end
• Free cross-reference tool and ready-stock snapshot

Last reviewed 11 Nov 2026.

Sources

Fetched 11 November 2026.

• TNGlobal, “Vietnam’s Viettel targets first pre-commercial 6G call by early 2029 as Qualcomm’s first early access partner”, 20 July 2026: https://technode.global/2026/07/20/vietnams-viettel-targets-first-pre-commercial-6g-call-by-early-2029-as-qualcomms-first-early-access-partner/

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Frequently asked questions

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