Exactly one band appears in all three of Walsin’s RF component lines. We normalised the frequency string on every base station rf passive components row Walsin Technology (Walsin) publishes — 235 filters across 60 bands, 72 baluns across 27 bands, 17 couplers across 5 bands — and intersected them. The only band with a filter, a coupler and a balun is 2400–2500 MHz. Every cellular band in the export is missing at least one of the three.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds Walsin’s 15 RF parametric export files. We hold no Walsin RF datasheet — not for filters, couplers, baluns, multiplexers or antennas — so every specification figure below is quoted from the parametric export only and is flagged accordingly. Every part number is real. Counts are of part numbers, not pieces.
Which bands are covered by a filter, a coupler and a balun together?
One: 2400–2500 MHz. We collapsed each frequency string to a plain numeric range before comparing, so spelling differences could not split a band.
| Band | Filter parts | Coupler parts | Balun parts | Match / mismatch vs a complete front end |
|---|---|---|---|---|
| 2400–2500 MHz | 111 | 4 | 24 | Match — all three lines |
| 2300–2690 MHz | 3 | 0 | 6 | Mismatch — no coupler |
| 4900–5950 MHz | 7 | 0 | 6 | Mismatch — no coupler |
| 698–960 MHz | 8 | 0 | 0 | Mismatch — filter only |
| 1710–1910 MHz | 6 | 0 | 0 | Mismatch — filter only |
| 698–2690 MHz | 0 | 10 | 0 | Mismatch — coupler only |
| 617–2690 MHz | 0 | 1 | 0 | Mismatch — coupler only |
Of the 60 bands in the filter file, 5 are also in the balun file and 1 is also in the coupler file. The balun and coupler files share one band. The three-way intersection is a single entry, and it is the 2.4 GHz ISM band rather than any cellular allocation.
For a base station front end that means the component choice is not a single-vendor decision per
band. A 2.4 GHz small-cell or backhaul path can be filtered, coupled and balanced from this one
catalogue; a 700 MHz or 1800 MHz path cannot. RBBPF2012050AHT is a 2012 band pass filter at
2400–2500 MHz, TFCPL0605B2450T the thin film coupler at the same band, RFBLN1608070ADT a
1608 balun at 1.0 dB insertion loss. Those three are the only shape of complete set the export
supports.
Why can I not filter Walsin’s RF data by band?
Because the same band is written several different ways in the same column. The filter file’s 60 real bands are recorded as 85 distinct frequency strings, and 14 of the 60 appear in more than one spelling.
| Band | Parts | Spellings in the file |
|---|---|---|
| 2400–2500 MHz | 111 | 6 |
| 4900–5950 MHz | 7 | 4 |
| 824–915 MHz | 7 | 4 |
| 1125–1675 MHz | 5 | 3 |
| 4900–5900 MHz | 4 | 3 |
| 5150–5950 MHz | 5 | 3 |
| 698–960 MHz | 8 | 2 |
| 1880–2025 MHz | 7 | 2 |
The worst case is the band with the most parts. 2400–2500 MHz is written
2400 - 2500 MHz on 29 rows, 2400 ~ 2500 MHz on 27, 2400~2500 MHz on 26, 2400-2500 MHz on
24, 2400-2500MHz on 4 and 2400- 2500 MHz on 1. A text search on any single spelling returns
at most 29 of the 111 parts. RBBPF1005040A1T uses the tilde-with-spaces form,
RFBPF2009A12T the plain hyphen, RFBPB2520090A7T the no-space form and
RFBPB2012090AM1T59 the one-off 2400- 2500 MHz. Four part numbers, one band, four strings.
The Filter Type column has the same problem in miniature: 110 rows read Band Pass Filter with
a double space and 2 read Band Pass Filter with one. Any grouping on that column reports two
filter types where there is one.
What does the cellular wideband coupler line actually cover?
A continuous sweep, which is why it matches nothing else. 13 of the 17 couplers are cut as wide cellular ranges rather than per-band parts.
| Band as written | Coupler parts | Example | Matches a filter band? | Matches a balun band? |
|---|---|---|---|---|
| 698–2690 MHz | 10 | RFCPL1608070P2T |
No | No |
| 700–2700 MHz | 1 | RFCPL1608070PM9T16 |
No | No |
| 699–2690 MHz | 1 | RFCPD1608050PS5T92 |
No | No |
| 617–2690 MHz | 1 | RFCPL1608070PFT |
No | No |
| 2400–2500 MHz | 4 | RFCPL1810B2450T |
Yes | Yes |
The four wideband strings are four near-identical ranges — 617, 698, 699 and 700 MHz at the
bottom, 2690 or 2700 MHz at the top — written as four separate values. They differ by a few
megahertz at each edge and none of them equals another. A tool that groups couplers by band
reports four single-part bands plus one ten-part band, when the engineering reality is one
cellular sweep. The 2400–2500 MHz couplers split two ways as well: the thin film parts write
2400~2500 MHz and RFCPL1810B2450T and RFCPL1806B2450T write 2400-2500 MHz.
This is also why the coupling and insertion loss figures are unusable as columns. On
RFCPL1608070P2T the insertion loss field holds three sub-band figures in one cell —
0.20 dB, 0.22 dB and 0.25 dB over three different ranges — separated by newlines. One row, three
specifications, no column to put them in. For the 17 couplers compared field by field, see
Walsin RF couplers vs thin film couplers.
What is wrong with the balun phase and impedance columns?
Two things, and both break a sort. The Phase Difference column writes the same specification with three different Unicode characters for the degree symbol.
| Character | Code point | Rows | Example part |
|---|---|---|---|
| ° | U+00B0 degree sign | 51 | RFBLN20121G8D0T |
| ∘ | U+2218 ring operator | 16 | RFBLN20121G8D1T |
| ˚ | U+02DA modifier letter ring above | 5 | RFBLN2012090A1T |
RFBLN20121G8D0T and RFBLN20121G8D1T are one character apart in the part number, both specify
180° ± 10°, and the two rows do not match as strings. A group-by on Phase Difference splits one
specification into three.
The Balanced Impedance column has a different fault: on three rows it holds a chipset name instead of an impedance.
| Part number | Balanced Impedance as published | Match / mismatch vs a numeric field |
|---|---|---|
RFBLN1608070ADT |
100 | Match |
RFBLN1608060ACT |
“Conjugate match to Nordic nRF24LE1” | Mismatch — free text |
RFBLN1608050AAT |
“Conjugate match to AR6003 Chipset” | Mismatch — free text |
RFBLN2012060A8T |
“Conjugate match to TI2530 and 2531 Chipsets” | Mismatch — free text |
Three of 72 baluns are specified against a named transceiver rather than an impedance. That is useful information and it is in the wrong place: a numeric filter on balanced impedance drops all three, and they are the parts whose match is most tightly defined.
What high-Q MLCC is available for the matching network?
1,709 parts in the High Q and Low ESR (HH) series, and the shape of the offering is narrow in one axis and wide in another.
| Case size | HH parts | Dielectric |
|---|---|---|
| 0201 | 217 | NPO only |
| 0402 | 509 | NPO only |
| 0603 | 514 | NPO only |
| 0805 | 469 | NPO only |
| 1206 and above | 0 | — |
All 1,709 high-Q parts are NPO and none is larger than 0805. Rated voltages run from 10 Vdc to 630 Vdc. Alongside them Walsin publishes 3,615 Microwave (RF series) parts and 285 Ultra Microwave (UF series) parts, the UF line concentrated at 0201 with 206 of its 285 parts. For the dielectric reasoning behind an NPO-only high-Q range, see High-Q low-ESR MLCC for RF. The full range is on the Walsin RF range page.
Does Venatech hold an RF datasheet?
No, and that is worth saying plainly. We hold 26 MLCC datasheet PDFs and 2 chip resistor datasheets. For the RF line — filters, couplers, baluns, multiplexers, SAW and BAW filters — and for inductors, varistors, disc capacitors and antennas, we hold parametric export files and nothing else. So every RF figure in this post is a figure from that export, not a figure read off a qualified datasheet.
That is also why the defects above matter more here than they would on the MLCC line. On an MLCC you can check an odd export row against a datasheet. On an RF filter there is no second source to check against in anything we hold, and the export is the specification until Walsin sends the datasheet. Link only to Walsin’s own site for RF specifications, and ask us to request the datasheet for any part number you are serious about.
What does Venatech add on an RF line with no datasheet?
Three things, and the first is the honest statement above — a catalogue page will not tell you that the specification you are reading has no datasheet behind it in the supply chain you are buying through. Second, the measurements: the band intersection, the six spellings, the three degree characters and the three free-text impedance rows are all things a selection tool silently gets wrong, and we can hand you the corrected band list rather than the raw column. Third, a dated snapshot of Hong Kong stock plus lot and date-code traceability with a certificate of conformity on request, so an RF part arrives with a paper trail rather than just a reel label.
We will not tell you a part is equivalent. We will show you where it differs, field by field, and the qualification decision stays with you.
The short version
One band — 2400–2500 MHz — has a filter, a coupler and a balun. No cellular band has all three. The filter file writes 60 bands as 85 strings, and 2400–2500 MHz alone has six spellings over 111 parts, so a text filter returns at most 29 of them. The four wideband cellular couplers match nothing else in the export. The balun phase column uses three different degree characters and three balun rows hold a chipset name where an impedance belongs. All 1,709 high-Q MLCC are NPO and none exceeds 0805. And we hold no RF datasheet, so treat every figure here as an export figure.
Send us the bands your front end has to cover and we will tell you which of the three component types exists at each one, using the corrected band list rather than the raw column. Or give us one part number and ask us to cross it, and we will request the datasheet from Walsin at the same time.
Faster than an email. The cross-reference tool takes a pasted list or a spreadsheet and returns Walsin candidates field by field, differences included. Ready stock shows what is physically in Hong Kong as a dated snapshot, so you can see straight away whether a line is a stock pull or a production slot. Qualification stays with you.
Frequently asked questions
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Which bands does Walsin cover with a filter, a coupler and a balun?
One: 2400–2500 MHz. Walsin’s RF export holds 235 filters across 60 bands, 72 baluns across 27 bands and 17 couplers across 5 bands. The three-way intersection is the single 2.4 GHz entry. 2300–2690 MHz and 4900–5950 MHz have a filter and a balun but no coupler.
How many ways does Walsin write 2400-2500 MHz in its filter data?
Six, across 111 parts: 2400 - 2500 MHz on 29 rows, 2400 ~ 2500 MHz on 27, 2400~2500 MHz on 26, 2400-2500 MHz on 24, 2400-2500MHz on 4 and 2400- 2500 MHz on 1. A text search on any one spelling returns at most 29 of the 111 parts.
What frequency range do Walsin’s cellular couplers cover?
Four near-identical wideband ranges plus one narrow band. 10 parts read 698–2690 MHz, and there is one each at 700–2700 MHz, 699–2690 MHz and 617–2690 MHz. None of the four equals another and none matches any filter or balun band in the export. The remaining 4 couplers are at 2400–2500 MHz.
Why does Walsin’s balun phase difference column not sort correctly?
Because the degree symbol is written three ways: the degree sign U+00B0 on 51 rows, the ring operator U+2218 on 16 and the modifier letter ring above U+02DA on 5. RFBLN20121G8D0T and RFBLN20121G8D1T both specify 180 degrees plus or minus 10 degrees and do not match as strings.
Which Walsin baluns have no numeric balanced impedance?
Three of 72. RFBLN1608060ACT, RFBLN1608050AAT and RFBLN2012060A8T carry a conjugate-match note naming a transceiver chipset in the balanced impedance field instead of a number. A numeric filter on that column drops all three.
How many high-Q MLCC does Walsin offer and in what sizes?
1,709 parts in the High Q and Low ESR series, all NPO, at 0201 (217), 0402 (509), 0603 (514) and 0805 (469). There are none above 0805. Rated voltages run from 10 to 630 volts direct current. Walsin also publishes 3,615 Microwave series and 285 Ultra Microwave series parts.
Does Venatech hold Walsin RF datasheets?
No. We hold 26 MLCC datasheet PDFs and 2 chip resistor datasheets. For RF, inductors, varistors, disc capacitors and antennas we hold parametric export files only, so every RF specification in this post is an export figure. Ask us to request the datasheet from Walsin for any part number you intend to design in.
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.