A buyer in Italy or Spain sourcing passive components from Hong Kong should ask six questions, and a distributor worth the order will answer all six against its own data. We answer them here about the inductor and antenna lines from Walsin Technology (Walsin), where the honest answer to several is uncomfortable: we hold no datasheet at all, and four part numbers contradict themselves.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this checklist from its own files: Walsin’s inductor parametric export of 5,411 rows, of which one is a QA test artefact and 5,410 are real parts; Walsin’s antenna export of 44 rows; and our Hong Kong ready-stock snapshot dated 23 September 2026. Every part number below is real. Counts are of part numbers rather than pieces. We hold no Walsin inductor datasheet and no Walsin antenna datasheet, so every specification figure here describes what the parametric export prints rather than what a document guarantees.
Why does this checklist exist, and who is it for?
For a buyer in Italy or Spain placing a first order with a distributor eleven time zones away, on a line whose documentation they have not seen. Italian appliance and industrial electronics and Spanish renewable-energy equipment both buy passive components in volume, and both carry audit obligations on provenance that a working part does not satisfy by itself.
Venatech has no Italian entity and no Spanish entity. There is no warehouse, no local inventory, no sales office and no local support line in either country. The operating entities are Hong Kong, Shenzhen, Singapore and the Jiangmen factory in Guangdong, with Chengdu in preparation. Everything ships from Hong Kong. That is the context the six questions are asked in, and the reason the answers have to be documentary rather than geographic. For the provenance side of it, see what an authorised distributor means and how to verify one.
Question 1: which manufacturer documents do you actually hold?
Not “can you get one” — which ones are on file today. The distinction matters because a distributor who can request a document in two weeks and a distributor who has it open on the desk give very different answers to a design review on Friday.
Ours, for Walsin: 26 MLCC datasheet PDFs, 2 chip resistor datasheet PDFs, and nothing at all for the inductor, antenna, MOV, disc capacitor or RF lines. Not one inductor datasheet. Not one antenna datasheet. For those lines we link only to Walsin’s own site, we mark every specification claim for confirmation, and we put the document request to the manufacturer against your exact part number.
That is an awkward answer to publish and it is the right one. A buyer can plan around a known gap. A buyer cannot plan around a gap they were not told about.
Question 2: how many part numbers in this line have no datasheet?
Ask for the number, not the reassurance. On Walsin’s inductor line our answer is 208 part numbers across five series — VEFL, WIP, SCM, SCA and BIH — for which we have located no datasheet anywhere, including on Walsin’s own site. That is our established finding and it is already published. The parametric export returns 129 rows for those five series: 27 VEFL, 53 WIP across four sub-series, 18 SCM, 18 SCA and 13 BIH.
It matters more than the share suggests, because the undocumented series are not the dull corners of the catalogue. VEFL holds some of the highest rated currents in the whole inductor line. See the 208 Walsin inductors with no datasheet for the field-by-field audit.
Question 3: which fields are blank, and on how many parts?
A parametric table looks complete because every row is populated. Ask which cells are populated with nothing useful.
On the inductor line, 146 of 5,410 part numbers publish a saturation current — the magnetic limit — and 5,264 leave it blank. That figure is ours and already published. It means 97.3% of the inductor catalogue tells you a thermal limit and nothing about where the core stops working.
Three more gaps are worth the question. The export’s fourteen columns include no temperature
field of any kind, so rated current arrives without the ambient it was measured at. The
antenna export’s ten columns include no radiation efficiency, no ground-plane requirement and
no return loss. And a literal 0 is used where a figure is absent on several inductor
columns, which reads as a measurement rather than a blank.
Question 4: does the part number agree with the data behind it?
This is the question almost nobody asks, and it is the one that found something. Walsin’s
µH-class inductor part numbers encode the inductance in the code itself — R47 for 0.47 µH,
1R5 for 1.5 µH, 4R7 for 4.7 µH. So the part number and the Inductance column are two
independent statements of the same fact, and they can be checked against each other.
We decoded all 488 µH part numbers that carry an R-notation value and compared each against
its own Inductance cell. Four disagree. This is the measurement we established for this
post, and it is reproducible in one pass over the file.
| Part number | Value encoded in the code | Value in the Inductance column |
RDC | Rated current | Match / mismatch |
|---|---|---|---|---|---|
WLPH201610MR47PP |
0.47 µH | 4.0 µH | 33mΩ |
3.5 A | Mismatch — the code and the column disagree |
WIP201610P-R47ML |
0.47 µH | 4.0 µH | 33mΩ |
3.5 A | Mismatch — same defect in a mirror series |
WQPH201610M1R5PS |
1.5 µH | 2.2 µH | 0.086Ω |
2.4 A | Mismatch — duplicates the next value up |
WPA201610S-1R5ML |
1.5 µH | 2.2 µH | 0.086Ω |
2.4 A | Mismatch — same defect in a mirror series |
Two distinct defects, each appearing twice because those four series publish mirrored data under different names. And in both cases the surrounding rows settle which statement is right.
| Part number | Inductance as exported | RDC | Rated current | Match / mismatch against the ladder |
|---|---|---|---|---|
WLPH201610MR33PP |
0.33 µH | 24mΩ |
4.1 A | Match — the rung below |
WLPH201610MR47PP |
4.0 µH | 33mΩ |
3.5 A | Mismatch — DC resistance and current place it at 0.47 µH |
WLPH201610MR68PP |
0.68 µH | 41mΩ |
3.4 A | Match — the rung above |
WLPH201610M4R7PS |
4.7 µH | 240mΩ |
1.3 A | Mismatch — what a real 4.7 µH part looks like |
WIP201610S-R47ML |
0.47 µH | 23mΩ |
4.5 A | Match — the sibling 0.47 µH part exports correctly |
WLPH201610MR47PP has 33 mΩ and 3.5 A, sitting exactly between the 0.33 µH and 0.68 µH rungs.
A genuine 4.7 µH part in the same family has 240 mΩ and 1.3 A — seven times the DC resistance
and a third of the current. The code is right and the column is wrong.
The WQPH case is the one that will bite a search. WQPH201610M1R5PS exports 2.2 µH, which is
the value WQPH201610M2R2PS already holds. Filter the WQPH 2016(0806) family for 2.2 µH and
you get two part numbers, one of which is not a 2.2 µH part. Their DC resistances, 0.086 Ω
and 0.117 Ω, differ by a third, which is what you would expect from 1.5 µH and 2.2 µH rather
than from two parts of the same value.
Question 5: what is in stock, and when was it counted?
Ask for the date on the count. Any stock figure without one is a claim, not a number. Ours is a snapshot, never a live sync.
Our Hong Kong ready-stock snapshot dated 23 September 2026 holds 1,125 part numbers, and its composition answers a question an inductor buyer should ask before assuming a stock pull:
| Product line | Part numbers in the 23 September 2026 snapshot | Match / mismatch for an inductor enquiry |
|---|---|---|
| MLCC | 732 | Mismatch — different line |
| Chip resistor | 254 | Mismatch — different line |
| MLCC, specialty | 132 | Mismatch — different line |
| Safety capacitor | 3 | Mismatch — different line |
| Resistor array | 1 | Mismatch — different line |
| Inductor | 2 | Match — and that is the whole inductor shelf |
| Antenna | 0 | Mismatch — order-in line, no stock on that date |
Exactly two of the 1,125 part numbers were inductors: WLPH252012M2R2PP and
WLPH252012M4R7PP. Both are WLPH 2520(1008) parts at 1.2 mm thickness and ±20%, and
neither publishes a saturation current — 0 of 2, consistent with the 146-of-5,410 figure
across the line. No antenna part number appeared on that date at all, which is why we quote
antennas as an order-in line rather than a shelf item.
So the honest shape of the inductor line from Hong Kong is: a 5,410-part catalogue, a two-part stock snapshot, and a production lead time for everything else. Stock moves, so treat that snapshot as dated and ask by part number. Ready stock carries the current snapshot.
Question 6: what will you not claim?
The most useful answer in the whole checklist. Ask a distributor to state its limits and see whether it can.
Ours, on these two lines. We hold no inductor datasheet and no antenna datasheet. We hold no ISO 9001 and no IATF 16949 certification of our own, and we never claim one. We hold no manufacturer’s affected-part list for any brand, so we will not tell you that any competitor part number is discontinued, obsolete or end-of-life — we have no such list and say so. Walsin’s own certifications and its AEC-Q200 statements are Walsin’s; its datasheets say compliant rather than certified, and we do not upgrade that. We have no entity, office, warehouse or stock in Italy or Spain. And we will not tell you a part is equivalent. We will show you where it differs.
That last one is what the cross-reference tool does: paste one part number or drop in a spreadsheet of the whole line, and each result names what matches and what does not, field by field. It is live and public. What it adds over a manufacturer’s search box is the column that says where the difference is — including, on this line, where the data disagrees with itself. The catalogue sits on the Walsin inductor range page.
The short version
Six questions: which documents do you hold, how many parts have none, which fields are blank, does the part number agree with the data, when was the stock counted, and what will you not claim. Our answers on Walsin’s inductor and antenna lines: no datasheet at all for either; 208 part numbers across five series with none published anywhere; 146 of 5,410 with a saturation current; four µH part numbers whose code contradicts their own inductance cell; two inductor part numbers and no antennas in the 23 September 2026 snapshot; and no entity or stock in Italy or Spain.
Send your BOM or a single part number and we will answer all six questions against your lines in writing — including the lines where the answer is that we do not hold the document. Qualification stays with you.
Frequently asked questions
Does Venatech have an entity, office or stock in Italy or Spain?
No, in neither country. The operating entities are Hong Kong, Shenzhen, Singapore and the Jiangmen factory in Guangdong, with Chengdu in preparation. There is no Italian or Spanish entity, warehouse, local inventory, sales office or support line. Everything ships from Hong Kong, and delivery terms should be quoted and compared at enquiry.
Does Venatech hold a Walsin inductor or antenna datasheet?
No, neither. Venatech holds 26 Walsin MLCC datasheet PDFs and 2 chip resistor datasheet PDFs, and nothing at all for the inductor, antenna, MOV, disc capacitor or RF lines. For those lines Venatech links only to Walsin’s own site and requests the document from Walsin against the exact part number.
How many Walsin inductors have no published datasheet?
208 part numbers across five series — VEFL, WIP, SCM, SCA and BIH — for which Venatech has located no datasheet anywhere, including Walsin’s own site. The parametric export returns 129 rows for those five series: 27 VEFL, 53 WIP across four sub-series, 18 SCM, 18 SCA and 13 BIH.
Can a Walsin part number disagree with its own specification data?
Yes, on four part numbers that we found. Of the 488 microhenry-class inductor part numbers that encode the inductance in the code, four export a different value in the Inductance column. WLPH201610MR47PP and WIP201610P-R47ML show 4.0 microhenry against a 0.47 microhenry code; WQPH201610M1R5PS and WPA201610S-1R5ML show 2.2 microhenry against a 1.5 microhenry code.
How many inductors were in Venatech’s Hong Kong stock snapshot?
Two of 1,125 part numbers on 23 September 2026: WLPH252012M2R2PP and WLPH252012M4R7PP. Both are WLPH 2520 metric parts at 1.2 millimetres and plus or minus 20 percent, and neither publishes a saturation current. No antenna part numbers appeared on that date. Stock moves, so treat the figure as a dated snapshot.
What will Venatech not claim about a component line?
Five things. We will never tell you a part is equivalent; we show you where it differs. We will not say any competitor part number is discontinued or end-of-life, because we hold no manufacturer’s affected-part list. We claim no ISO 9001 or IATF 16949, holding neither. We do not upgrade Walsin’s AEC-Q200 wording from compliant to certified. And we do not imply a datasheet for the inductor or antenna lines, holding none.
Three ways to get this answered today
1. Cross a part, free. Paste up to 500 part numbers, or drop an Excel or CSV file, into the free cross-reference tool. It is matched against Walsin’s published catalogue and returns candidates field by field, with every difference from your original stated rather than hidden. Filter by commercial or automotive grade, or for soft termination, high temperature, safety certified, high Q / low ESR or low profile. There is no login and no charge.
2. Send the whole BOM. Upload a BOM and request a quote and we will come back line by line — including the lines we cannot help with, which is usually the more useful half of the answer.
3. Check the shelf before you commit. Ready stock shows what was physically in Hong Kong as at 23 September 2026. It is a dated snapshot, never a live feed, and quantities are never permanent.
Why take our word for any of this? Don’t — check it.
Venatech Limited (威納電子有限公司) is an authorised Walsin Technology distributor in Hong Kong. Confirm that with Walsin rather than with us. On the safety capacitor series we hold UL file E182369, which is searchable in UL’s own public database, together with TUV certificates R50381780 and R50195920 and CQC CQC20001280137 and CQC20001280136, against EN 60384-14:2023, IEC 60384-14:2023 and UL 60384-14. We hold 28 Walsin datasheets, 451 pages, and we will send the one covering your part number. Shipments arrive in original sealed Walsin packaging with lot and date-code traceability, and a certificate of conformity is available per shipment on request.
We will also tell you what we do not hold, which no competitor publishes. REACH, SVHC, conflict minerals, PFAS, China RoHS, ISO 9001, IATF 16949, PPAP, IMDS and a Declaration of Conformity appear nowhere in those 451 pages. You would rather hear that from us now than from your own supplier-approval team later. AEC-Q200 is compliant in Walsin’s own words and never certified, we hold no manufacturer’s end-of-life or allocation list for any brand, and qualification in your own circuit stays with you. We will not tell you a part is equivalent. We will show you where it differs.
Venatech Limited · Unit 207, 2/F, Sun Ling Plaza, 30 On Kui Street, Fanling, N.T., Hong Kong · (852) 2628 4777 · Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation.