RF Coupler Multiplexer Cross Reference: 17 of Walsin’s 33 Shelves Hold One Part

An RF coupler multiplexer cross reference against Walsin’s own data starts from 133 real part numbers — 17 couplers, 116 multiplexers — split by case size, series and frequency band into 33 distinct shelves. 17 of those 33 shelves hold exactly one part number. There is no second Walsin candidate on more than half the catalogue.

Couplers and multiplexers are the two smallest lines in Walsin’s RF range. Measured against the whole 457-part RF catalogue, they are thin, and the thinness is not spread evenly.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds Walsin Technology (Walsin)’s whole RF parametric data folder, including Walsin_Coupler.xlsx and Walsin_Multiplexer.xlsx. We compared each of those two files against its folder twin, FRESH_rf_cpl.xlsx and FRESH_rf_multiplexer.xlsx, row for row: identical part numbers, identical values, in both pairs. Every part number below is real and came from one of the two primary files. We hold no RF datasheet of any kind, so every specification below is the export’s own value, stated as such.

How many real coupler and multiplexer part numbers does Walsin publish, and are the files doubled?

17 couplers and 116 multiplexers — 133 real part numbers, not 266. We checked Walsin_Coupler.xlsx against FRESH_rf_cpl.xlsx and Walsin_Multiplexer.xlsx against FRESH_rf_multiplexer.xlsx cell by cell: 17 of 17 and 116 of 116 rows match exactly between each pair. The same duplication runs across the whole RF folder — we found it in the balun, antenna switch, SAW and BAW files too — so the real deduplicated RF catalogue is 457 part numbers, not the 914 a naive sum of every file in the folder produces.

File	Rows (deduplicated)	Series / type	Sizes present
Walsin_Coupler.xlsx	17	Coupler (15), Thin Film Coupler (2)	1608 (15), 605 (2)
Walsin_Multiplexer.xlsx	116	Diplexer (105), Triplexer (11)	1608 (57), 2012 (46), 2520 (7), 1005 (5), 2109 (1)

Combined, couplers and multiplexers are 133 of the 457-part deduplicated RF catalogue — 29.1% of the part count, concentrated into the two smallest exports Walsin publishes.

How thin is each shelf once it is split by size, type and frequency band?

Very. We grouped every row in both files by case size, series or type, and frequency band — normalising only the punctuation that separates a band’s low and high edge, never the numbers themselves — to see how many real alternatives exist at each point in the catalogue. The result is 33 distinct shelves across the two files, and 17 of them hold exactly one part number. We have not seen this counted anywhere.

File	Distinct size/type/band shelves	Shelves with exactly 1 part	Shelves with more than 1 part
Coupler	6	3	3
Multiplexer	27	14	13
Combined	33	17	16

Just over half of every band-and-size combination Walsin’s coupler and multiplexer lines offer has no Walsin alternative at all. The 16 shelves with more than one part are not evenly populated either — the largest single shelf, a 1608-size 2.4 GHz WiFi diplexer, holds 38 part numbers on its own, which is more than the entire coupler file.

What does the coupler shelf actually offer across its two sizes?

Two sizes and effectively two frequency families. Walsin’s 17 couplers sit in 1608 (15 parts, the Coupler series) and 605 (2 parts, the Thin Film Coupler series) — no other case size exists in the file. We grouped all 17 rows by frequency window and found a wide telecom band near 700–2700 MHz covering 13 parts across four slightly different window edges, and a 2.4 GHz WiFi/Bluetooth/Zigbee band covering the remaining 4.

Frequency window	Parts	Second source inside this file?
698–2690 MHz, 1608, Coupler	10	Yes — 10 candidates
617–2690 MHz, 1608, Coupler	1	No — one part, RFCPL1608070PFT
699–2690 MHz, 1608, Coupler	1	No — one part, RFCPD1608050PS5T92
700–2700 MHz, 1608, Coupler	1	No — one part, RFCPL1608070PM9T16
2400–2500 MHz, 1608, Coupler	2	Yes — 2 candidates, RFCPL1810B2450T and RFCPL1806B2450T
2400–2500 MHz, 605, Thin Film Coupler	2	Yes — 2 candidates, both written with the tilde spelling

Only one of the six real coupler shelves — the 698–2690 MHz window in 1608 — carries double-digit candidates. Everything else in the file is a single part or a pair.

What does the multiplexer shelf actually offer across its five sizes?

Heavily concentrated at one band. 1608 and 2012 between them hold 103 of the 116 multiplexer rows — 88.8% of the file — and 2520, 1005 and 2109 share the remaining 13. We normalised every spelling of Frequency 1 and counted the real population of each band: 70 of the 116 rows sit at 2400–2500 MHz once the tilde, the hyphen and the spaced-tilde spellings are read as the same band. A naive filter on the single most common exact string, 2400~2500 MHz, returns only 62 of those 70 — an 8-part undercount nobody filtering this file by string match would notice.

Spelling of the 2400–2500 MHz band in Frequency 1	Rows
2400~2500 MHz	62
2400 ~ 2500 MHz	6
2400-2500 MHz	2
Total at this band	70

Of the 27 size/type/band shelves in the multiplexer file, 14 hold exactly one part. The Triplexer type alone is nearly all one shelf: 8 of its 11 rows sit in a single 2012-size, three-band combination covering 1560–1606 MHz, 2400–2500 MHz and 4900–5950 MHz.

Which multiplexer candidates actually match a stated 2.4 and 5 GHz WiFi requirement?

Three of seven checked clear both bands at the stated loss ceiling. We filtered the 57 1608-size diplexers to the 2.4G/5G WiFi application and checked each against a stated requirement: 2400–2500 MHz at 0.6 dB insertion loss or better, and 4900–5950 MHz at 0.7 dB or better, 50 Ω throughout.

Part number	Frequency 1 loss	Frequency 2 band	Frequency 2 loss	Match / mismatch vs the stated requirement
RFDIP1606L51T	0.35 dB	4900–5950 MHz	0.5 dB	Match on both bands, best loss of the group
RFDIP1606L367N3T	0.5 dB	4900–5950 MHz	0.6 dB	Match on both bands
RFDIP1606L168M1U	0.55 dB	4900–5950 MHz	0.7 dB	Match at the boundary of the second-band ceiling
RFDIP1606L16T	0.6 dB	4900–5950 MHz	0.8 dB	Mismatch — exceeds the second-band ceiling; also spells both bands with a hyphen, not the file’s dominant tilde
RFDIP1606L238Q1C	0.6 dB	5150–5850 MHz	1.5 dB	Mismatch — second band is narrower than required and loss exceeds ceiling by more than double

The impedance column, Pin Description and Category fields are not shown here because the file’s own offset defect — already established in Venatech’s RF data notes — shifts them one column to the left from Pin Description onward on all 116 rows. Read those three fields only after correcting for the shift.

What documentation does Venatech hold for Walsin couplers and multiplexers?

None. We hold 28 Walsin datasheets, 451 pages, across 26 MLCC series and 2 chip resistor series, and we checked all 28 filenames against the RF line: not one covers a coupler, multiplexer, balun or antenna switch. Every coupling factor, insertion loss figure and frequency band in this post is the parametric export’s own value. Power handling, return loss and land pattern are not in the export and cannot be confirmed from our side.

What does a one-part shelf mean for second sourcing?

It means the question to ask is not “does Walsin have this,” but “is this the only Walsin part at this band and size, or one of several.” Seventeen of the 33 shelves measured in this post are the first kind. A one-part shelf is not a reason to walk away — Walsin may still be the right second source against an incumbent from another manufacturer — but it does mean there is no fallback inside this catalogue if that one part does not qualify.

1. State the band, size and type before you search, not after. A 2.4 GHz WiFi diplexer in 1608 has 38 Walsin candidates; a 617–2690 MHz coupler in the same size has exactly one.
2. Cross the whole BOM in one pass at the free cross-reference tool — paste up to 500 part numbers or drop an Excel or CSV, and it matches against 800,000+ crossable Walsin part numbers, decoding 18 manufacturers’ part numbers and stating every difference field by field — we will not tell you a part is equivalent, we will show you where it differs.
3. Check what is physically in Hong Kong on ready stock, a dated snapshot as at 23 September 2026, before committing a production slot to a single-source shelf.
4. Ask for the datasheet before you qualify a one-part shelf. We hold none for this line, and your request is what puts it on the list to Walsin.

For the companion RF posts, see Walsin RF couplers vs thin film couplers and The Walsin multiplexer export is offset by one column. The full line is on the Walsin RF products page.

The short version

Walsin’s coupler and multiplexer lines are 133 real part numbers, confirmed against the folder’s duplicate files, out of a 457-part RF catalogue. Split by size, series or type and frequency band, that becomes 33 real shelves, and 17 of them — just over half — hold exactly one part number. The multiplexer file alone concentrates 70 of its 116 rows at a single 2.4 GHz band, and a naive string filter on that band’s commonest spelling silently drops 8 of them. We have not seen either figure counted anywhere else.

Send us the coupler or multiplexer candidates off your BOM with the band, size and loss ceiling you need, and we will tell you plainly whether Walsin offers one shelf or several — and name the exact part if it is one. Qualification stays with you.

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Frequently asked questions

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