A Vietnam audio EMS buyer who crosses a ferrite bead to Walsin meets two names for one part: 51 of the 139 distinct electrical rows in Walsin’s MCB-S, WLBD and WLBD(HC) ferrite bead export carry both an MCB-S and a WLBD part number. Every export field matches between the two. None is on our 23 September 2026 shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds the Walsin Technology (Walsin) inductor and ferrite bead parametric export: 5,411 rows, 5,410 real part numbers once a QA test row is removed. This post is for a procurement or design engineer at a Vietnamese contract manufacturer whose audio products carry ferrite beads on power, USB and signal lines and who wants Walsin candidates with every difference stated. Every Walsin part number below is real, every count is ours, and the one news fact is dated and sourced (fetched 2 November 2026).
What did Vietnam’s customs data report that touches an audio EMS buyer?
Vietnam’s foreign trade passed 1 trillion US dollars for the first time on 29 October 2026, with foreign-invested enterprises accounting for 77.5 percent of it. VOV, citing Vietnam Customs, reported exports of about 493.64 billion US dollars (up 27.2 percent) and imports of 507.66 billion (up 37.6 percent) for the year to that date.
The same article groups computers, electronic products and components, phones and components, and machinery together at 532 billion US dollars, 54 percent of trade value and up 49 percent. It does not separate audio equipment, and it does not say what the group’s parts content is. We draw no conclusion about any Vietnamese company, and we have no relationship with VOV or Vietnam Customs.
| Point | What the source says | Source date | Match / mismatch |
|---|---|---|---|
| Total trade | 1 trillion US dollars reached on 29 October 2026 | VOV, 29 October 2026 | Match for context only |
| Foreign-invested share | 77.5 percent of trade value | VOV, 29 October 2026 | Match for context only |
| Electronics, phones and machinery group | 532 billion US dollars, 54 percent, up 49 percent | VOV, 29 October 2026 | Match for context only; includes machinery |
| Audio equipment or ferrite beads | Not separated in the article | VOV, 29 October 2026 | Mismatch with any audio-specific claim |
How many Walsin ferrite bead rows are really the same part under two names?
We parsed all 220 rows of the MCB-S (81), WLBD (68) and WLBD(HC) (71) families. They collapse to 139 distinct electrical rows, and 51 of those carry two part numbers, one MCB-S and one WLBD. We grouped on size, thickness, impedance at 100 MHz, DC resistance, rated current and tolerance, with rated current normalised to milliamps because 16 WLBD rows write 200, 500, 600 or 800 with no unit.
Before that normalisation the count of WLBD-only rows looked like 17; after it, 1. The spelling of a unit, not the electrics, was hiding the twins. The 51 twin rows span seven case sizes (13 at 1608, 12 at 1005, 10 at 2012, 9 at 3216, 3 at 4532, 2 at 3225, 2 at 4516) and six rated currents from 100 to 800 mA. All carry plus or minus 25 percent. We have not seen this counted anywhere.
| Impedance at 100 MHz | Size, DC resistance, rated current | MCB-S name | WLBD name | Match / mismatch |
|---|---|---|---|---|
| 10 ohm | 1005, 0.1 ohm, 300 mA | MCB1005S100FBP |
WLBD1005K2U100TP |
Match on all export fields; prefix and suffix differ |
| 30 ohm | 1005, 0.25 ohm, 300 mA | MCB1005S300FBP |
WLBD1005K2U300TP |
Match on all export fields |
| 10 ohm | 1608, 0.05 ohm, 600 mA | MCB1608S100IBP |
WLBD1608K2U100TP |
Match on all export fields |
| 120 ohm | 1608, 0.15 ohm, 600 mA | MCB1608S121IBP |
WLBD1608K2U121TP |
Match on all export fields |
| 10 ohm | 1005, 0.09 ohm, 2 A | none | WLBD1005HCU100TH |
Mismatch: the HC family has no MCB-S name and carries 2 A, not 300 mA |
Your incumbent part goes in a sixth column on your own copy; we do not name one.
What does the export not tell you about these twins?
The export shows 11 fields per bead and the twins agree on all 11, but 0 of our 28 datasheets cover an inductor or ferrite bead. We hold no Walsin datasheet for the MCB-S, WLBD or WLBD(HC) families, so we cannot state a temperature range, a packaging quantity or an impedance curve for either name.
What the export does not say is which name a given Walsin region or release uses, whether the two share a production line, or whether either family is preferred for new designs. We do not guess. A sourcing engineer can ask for either part number and compare the supplier’s own sheet against the incumbent’s. The 71 WLBD(HC) rows, which print 1 to 9 A in mixed unit spellings, are a different family and belong in a different conversation: 57 electrical rows, none shared with MCB-S.
Why buyers in Vietnam choose Venatech
Buyers in Vietnam choose Venatech because we work from Hong Kong in small lots, we are an authorised Walsin Technology distributor, and we show you the mismatch as well as the match. For this one family we counted 220 rows down to 139 electrical rows and told you which 51 have two names. That is the level of detail a contract manufacturer needs when a bill of materials lists one bead and a second source must be named in writing.
We also give you the tools to do it yourself. The VenaMatch cross-reference tool decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts, with every difference from your original stated. The BOM page takes up to 500 part numbers at a time. We tell you what we do not hold, and we do not claim certifications we lack: we hold neither ISO 9001 nor IATF 16949. Lot and date-code traceability and a certificate of conformity per shipment are available on request. Ask, and we will say plainly what we can and cannot supply.
What will we not tell you about Vietnam?
Anything about Vietnamese customs, certification or import rules. We hold no office, entity or stock in Vietnam; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We state no duty rate, transit time or conformity requirement and give no legal or customs advice; confirm with your compliance team. We also make no statement about any bead’s audio performance, because the export carries no noise or impedance curve.
How Venatech helps
Paste the incumbent bead number into the free cross-reference tool, which decodes 18 manufacturers’ part numbers across 800,000+ crossable parts and lists Walsin candidates with match and mismatch fields, or upload the list to the BOM checker, up to 500 part numbers. The Hong Kong ready-stock list is a dated snapshot, 23 September 2026, never live-synced; of 134 power-inductor rows in related families only 2 are on it, and none of the 220 bead rows. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We work from Hong Kong, in small lots, and you can request a quote through the site. Worked example from our export: MCB1608S121IBP and WLBD1608K2U121TP agree on 120 ohm, 0.15 ohm and 600 mA. Our post on rated current versus saturation current explains the current fields, multilayer versus wirewound inductors covers the families, and the inductor range lists them. Qualification stays with you.
The short version
Count the names before you count the parts. Walsin’s MCB-S and WLBD ferrite bead families are 139 electrical rows, not 220, and 51 of those rows carry two part numbers with identical export fields. None is on the 23 September 2026 shelf. Confirm against the datasheet and qualify in your own board.
Send us one ferrite bead line from your audio bill of materials and we will return the Walsin candidates with every difference stated. Does your supplier approval list name the bead by part number or by electrical row?
Sources
Fetched 2 November 2026. The trade statistics come from this page; the part data, counts and stock position come from our own Walsin exports and stock list.
- VOV, “Vietnam’s trade turnover hits historic 1 trillion US dollar milestone”, 29 October 2026: https://english.vov.vn/en/economy/vietnams-trade-turnover-hits-historic-us1-trillion-milestone-post1345756.vov
Frequently asked questions
What did Vietnam’s trade data show?
VOV reported on 29 October 2026, citing Vietnam Customs, that trade passed 1 trillion US dollars for the first time. Exports were about 493.64 billion and imports 507.66 billion. The article does not separate audio equipment, so we draw no conclusion about any company.
How many Walsin ferrite bead rows are duplicates?
Of 220 rows in the MCB-S, WLBD and WLBD(HC) families, 139 are distinct electrical rows. Fifty-one of those carry two part numbers, one MCB-S and one WLBD, with the same size, thickness, impedance, resistance, current and tolerance in the export.
Why did the count change after normalising current?
Sixteen WLBD rows write rated current as 200, 500, 600 or 800 with no unit, while their MCB-S twins write milliamps. Read literally, the twins look different. Normalised to milliamps, the WLBD-only count falls from 17 to 1.
Does Walsin publish a datasheet for these beads?
We hold none. Our 28 Walsin datasheets cover 26 MLCC series and 2 chip resistor series, and nothing for inductors or ferrite beads. Ask Walsin for the family sheet, and treat any impedance curve or temperature range as unconfirmed until you hold it.
Are any of these ferrite beads on your shelf?
None of the 220 rows is on our 23 September 2026 Hong Kong ready-stock snapshot, which is dated and not live. Check the ready-stock page, or ask us to quote a lot, which we can do in small quantities from Hong Kong.
Do you ship to Vietnam or state its import rules?
We ship from Hong Kong and state no duty, customs, certification or transit information for Vietnam. We hold no office or stock there and give no legal or customs advice; confirm with your compliance team. You can request a quote through the site.