Crossing Johanson High-Q and RF Ceramic Families to Walsin: 5,606 Part Numbers Across 3 Shelves, Field by Field

A johanson cross reference to walsin starts with three shelves, not one. We counted 5,606 distinct high-Q NP0 part numbers across Walsin’s HH, Microwave RF and Ultra Microwave UF series. We will not tell you one of them is equivalent to your incumbent. We will show you, field by field, where it differs.

Venatech Limited, an authorised Walsin distributor in Hong Kong, re-parsed three Walsin Technology (Walsin) export files for this post — 08_High_Q_Low_ESR_HH.xlsx, 12_Microwave_RF.xlsx and 22_Ultra_Microwave_UF.xlsx — rather than quoting a figure we had banked earlier. Every part number below is real. We name Johanson Technology at family level only: no competitor part number appears here, and no competitor specification is reproduced. What we put in the table is Walsin’s data and an empty column for yours.

Which Walsin families answer a Johanson high-Q or RF ceramic line?

Four, and they do not overlap the way a selector implies. Johanson Technology’s catalogue spans a high-Q, low-ESR multilayer ceramic capacitor family and a set of RF ceramic component families — baluns, band-pass filters, couplers and diplexers. Walsin answers the first with three MLCC series totalling 5,606 distinct part numbers and the second with a separate RF line of 457.

The fourth row is the one to read twice. We hold 28 Walsin datasheets, 451 pages, and zero of them cover an RF component part number. The three capacitor shelves are covered. The balun, filter, coupler and multiplexer shelf is not, and we say so before you ask.

How many high-Q NP0 parts does Walsin publish, and where does the shelf stop?

5,606 distinct part numbers, and the ceiling depends entirely on which series you are standing in. We re-measured a figure we had previously banked — all 1,709 High Q / Low ESR MLCC are NP0 and none exceeds 0805 — and it needs two corrections.

First, 1,709 is a row count, not a part-number count. The file holds 1,709 rows and 1,706 distinct part numbers. Three codes appear twice: HH21N2R4C500, HH21N4R3C500 and HH21N5R1C500. We compared the pairs field by field. Capacitance, tolerance, voltage, dielectric, length and width agree on all three. Thickness does not — one row reads 0.60 ± 0.10 mm and the other 0.80 ± 0.10 mm, and the thinner row carries the remark “Customized product.” The same orderable code names two heights and nothing in it distinguishes them. We have not seen this counted anywhere. See how to cross reference an MLCC.

Second, the 0805 ceiling is true of HH and false of Walsin’s high-Q shelf as a whole. The Microwave RF series carries 149 parts at 1111 and 97 at 0505, both larger than 0805, with the 1111 parts published at 2.79 by 2.79 mm. “Walsin high-Q stops at 0805” sends a reader who needs a larger body away from 246 parts that exist.

Three more things we measured and will not round off:

• HH capacitance runs 0.1 pF to 3,300 pF. 0201 stops at 100 pF; 0603 reaches 3,300 pF.
• HH voltage runs 10 Vdc to 630 Vdc in 9 steps. 630 Vdc exists at 0805 only, on 42 parts.
• The HH Termination column states a finish on zero of 1,709 rows, and on 13 rows it holds a tolerance value instead — +-0.1pF where a plating code belongs, on parts including HH15N1R0B500 and HH21N1R0B201.

Which fields must match before you call a high-Q capacitor a candidate?

Six, and a cross result that ticks fewer than six is a shortlist entry, not a decision. This is the method, with Walsin’s real data and a column left empty for the part you are replacing. Fill it from your own datasheet, not from a distributor’s table — including ours.

Read the last row before the others. The series is called High Q & Low ESR and neither Q nor ESR appears as a column in any of the three files. The export will not rank parts on the parameter you are buying them for. For what the three series are actually aimed at, see high-Q, low-ESR MLCC for RF.

What breaks when you join Walsin’s three high-Q series on case size?

Everything, and the reason is three characters wide. The HH and UF files write case size as a three-digit integer — 201, 402, 603, 805. The Microwave RF file writes it as a four-character string — 0201, 0402, 0603, 0805, 01R5, 0505 — with one exception, 1111, stored as an integer. We joined the HH and Microwave RF Size columns and the intersection is empty: zero shared values across 5,321 part numbers. HH against UF intersects on two values, 201 and 402, because both files use integers.

So a cross tool that asks “what else does Walsin have at 0402 in high-Q NP0?” and joins on the raw column returns 509 HH parts or 908 Microwave RF parts, never both, and reports no error either way. We have not seen this counted anywhere.

The tolerance column has the same disease in a different form. Across the 5,609 rows in the three files, 5,571 write tolerance with the ASCII characters +- and 38 write it with the Unicode plus-minus sign. Plus or minus 0.5 pF alone is spelled three ways — +-0.50pF on 162 rows, +-0.5pF on 121 and ±0.5pF on 26 — one specification appearing as three values on 309 parts. This is why we publish mismatches instead of asserting matches: the data will not support the assertion.

Can you cross a Johanson RF ceramic balun, filter or coupler to Walsin?

You can start, and you cannot finish from data alone. Walsin’s RF line holds 457 part numbers across 8 functions — 235 filters, 116 multiplexers, 72 baluns, 17 couplers, 9 antenna switches, 5 BAW filters, 3 SAW filters and one file with zero rows. It answers the same functional families. What it does not have is documentation.

Four real Walsin RF parts you can take to Walsin’s own site and check: RFBLN16081G8D1T (balun, 1608), RFBPF1608050A0T (band pass filter, 1608), RFCPL1608070P2T (coupler, 1608) and RFDIP1606L168M1U (diplexer, Size 1608 while its own code reads 1606). We read both fields on that last one and we are not going to reconcile them for you.

What stays with you after the cross?

The qualification. A cross result from us is a shortlist with the differences stated: not an approval, not a test report, not a guarantee of fit. Three things we will do today, against 5,606 high-Q part numbers:

1. Cross the list. Paste up to 500 part numbers or drop your Excel or CSV into the free cross-reference tool, filter for high Q / low ESR, and read every stated difference. Commercial is shown first with the AEC-Q200 version beneath where one exists, and AEC-Q200 is compliant, never certified — ask us for the qualification report for your exact part number.
2. Send the datasheet. We hold 28 Walsin datasheets, 451 pages, and the three high-Q MLCC series are covered. Ask for the one covering your part number and it will be in your inbox, not in a brochure.
3. Check what is in Hong Kong. 89 of the 1,125 lines in our 23 September 2026 snapshot are high-Q NP0 parts — 22 HH, 66 Microwave RF and 1 UF — out of 5,606 distinct part numbers on those shelves. That is a dated snapshot, not a live feed. See ready stock and the Walsin MLCC range.

Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation, and nowhere else. Unit 207, 2/F, Sun Ling Plaza, 30 On Kui Street, Fanling, N.T., Hong Kong. (852) 2628 4777.

The short version

Walsin answers a high-Q and RF ceramic line with 5,606 distinct MLCC part numbers on three shelves and 457 RF components on a fourth. The HH file holds 1,709 rows but 1,706 part numbers, and 3 codes name two thicknesses each. The 0805 ceiling applies to HH only — the Microwave RF series reaches 0505 and 1111 on 246 parts. HH and Microwave RF share zero case-size strings, because one file stores integers and the other stores text. Neither Q nor ESR is a column in any of the three files. We hold zero datasheet pages for the RF component line. 89 of 1,125 snapshot lines are high-Q parts as at 23 September 2026. Qualification stays with you — our job is to hand you the differences before you find them on the bench.

Send us the high-Q and RF ceramic lines off your bill of materials and we will return a field-by-field position on each: which Walsin shelf answers it, which fields match, which do not, and which specification nobody publishes. And a question back: the last high-Q cross you accepted — did anyone show you the Q figure, or just the capacitance?

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