Automotive infotainment inductors for Japan split into two families at Walsin. We parsed all 5,410 inductor rows: 289 sit in series named Automotive, and none exceeds 120 nH or states a saturation current. The power inductors a supply rail needs, 171 rows at 1 to 4.7 uH and 2 A or more, carry no automotive marker.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds the Walsin Technology (Walsin) inductor parametric export: 5,411 rows as delivered, 5,410 after we remove one QA test row. This post is for a Japanese design or procurement engineer building a head unit, display audio or telematics board who needs to know which Walsin inductor families carry an automotive marker and which do not. We hold no inductor datasheet. Every part number is real, and every news item was fetched on 23 October 2026.
What did JAMA report that touches a Japanese component buyer?
A rising build. SteelOrbis, citing the Japan Automobile Manufacturers Association, reported on 6 October 2026 that Japanese automobile production, passenger cars, trucks and buses, totalled 5,101,152 units in January to July 2026, up 3.7 percent, with July alone at 802,102 units, up 7.8 percent.
The report says nothing about infotainment, inductors or any supplier, and we draw no conclusion about which parts any maker buys. We have no relationship with JAMA or its members. The figure is the reason a Japanese buyer is asking the question, not an answer to it.
| Point | What the source says | Source date | Match / mismatch |
|---|---|---|---|
| January to July 2026 output | 5,101,152 units, up 3.7% | SteelOrbis, 6 October 2026, citing JAMA | Match for context only |
| July 2026 output | 802,102 units, up 7.8% | Same | Match for context only |
| Component demand | Not stated | Same | Mismatch: no part, volume or shortage is named |
Which Walsin inductor families are marked automotive?
Two series names carry the word Automotive, 289 rows of 5,410. The 139-row MCI Automotive Series is signal inductors from 0.3 to 120 nH at 0402 and 0603, rated 0.2 to 1.0 A; the 150-row MCB / MHC Automotive Series is ferrite beads, 20 to 2,500 ohm at 100 MHz, rated 0.15 to 4.0 A.
We counted the largest inductance in any automotive-marked row: 120 nH, and 0 of the 289 rows is above it. None of the 289 rows states a saturation current; the whole export states one on 146 rows, all in the CSME, CSMEA and MIP-H series, none marked automotive. We have not seen this intersection counted anywhere.
| Function on an infotainment board | Walsin family in the export | Rows | Automotive-marked | What is published | Match / mismatch for your incumbent |
|---|---|---|---|---|---|
| RF matching for GNSS, radio, Bluetooth | MCI Automotive | 139 | Yes, in the series name | 0.3 to 120 nH, 0.2 to 1.0 A, Q min 8 to 12 | Match if your value is 120 nH or less; mismatch above that |
| Supply and signal filtering beads | MCB / MHC Automotive | 150 | Yes, in the series name | 20 to 2,500 ohm at 100 MHz, 0.15 to 4.0 A | Match if you need a bead; mismatch: 26 rows reach 2 A |
| Buck inductor, 1 to 4.7 uH, 2 A or more | WLPH, WQPH, WIP, WPA, CSME, CSMEA and others | 171 in 13 series | No | Rated current on all; saturation current on 53 | Mismatch on the automotive marker; match on value and size |
The marker is the series name only. We hold no inductor datasheet, so we cannot say which test, if any, the word Automotive refers to. Our earlier post on the MCB, MHC and MCI automotive inductors compares the commercial twins.
Where does a head-unit supply rail find its inductor?
In the 171 rows with no automotive marker. We filtered the export to 1.0 to 4.7 uH, rated current 2 A or more, and series not named Automotive: 171 rows in 13 series, of which 53 state a saturation current, the 32 CSME and 21 CSMEA rows; the other 118 state none.
A buck rail needs the saturation current, because rated current is the thermal limit and saturation is where inductance collapses. Our post on rated current against saturation current explains the gap. On a rail where you must see it, 118 of 171 rows leave you asking Walsin.
Which parts fit a 2.2 uH rail at 2 A in 2520 or 2016?
Sixteen rows, six series, one on the shelf. Filtering to a 2R2 code, 2016 or 2520 size and 2 A or more gives 16 rows: WLPH, WLPH(HC), WQPH, WIP, WIP_S and WPA. Only WLPH252012M2R2PP is on our 23 September 2026 list, and none of the 16 states a saturation current.
Two more rows trap a column filter. WQPH201610M1R5PS and WPA201610S-1R5ML have 1R5 in the part number but 2.2 uH in the Inductance column, so a filter on the column returns 18 rows and a filter on the code returns 16. Check the code, not only the column.
| Walsin part | Series as exported | Size, thickness | Rated current, DC resistance | Shelf | Match / mismatch against a 2.2 uH, 2 A rail |
|---|---|---|---|---|---|
WLPH252012M2R2PP |
WLPH | 2520, 1.2 mm | 2.27 A, 85 mohm | Yes | Match on value and current; mismatch: saturation current not published |
WIP252012P-2R2ML |
WIP | 2520, 1.2 mm | 2.27 A, 85 mohm | No | Match on every published field with the WLPH part; mismatch: different series, none on shelf |
WLPH252010M2R2PP |
WLPH | 2520, 1.0 mm | 2.30 A, 99 mohm | No | Match on value and current; mismatch: 0.2 mm thinner, higher resistance |
WLPH252012M2R2PS |
WLPH(HC) | 2520, 1.2 mm | 2.50 A, 74 mohm | No | Match on value; mismatch: higher current, lower resistance |
WQPH252012M2R2PS |
WQPH | 2520, 1.2 mm | 2.50 A, 74 mohm | No | Match on every published field with the WLPH(HC) part; mismatch: series |
WPA252012S-2R2ML |
WPA | 2520, 1.2 mm | 2.50 A, 74 mohm | No | Same published fields; mismatch: series |
WLPH201610M2R2PS |
WLPH(HC) | 2016, 1.0 mm | 2.20 A, 117 mohm | No | Match on value and current; mismatch: smaller footprint, higher resistance |
WIP201610S-2R2ML |
WIP_S | 2016, 1.0 mm | 2.20 A, 117 mohm | No | Same published fields as the WLPH(HC) 2016 part; mismatch: series |
The stocked line has a twin in a second series: WIP252012P-2R2ML shows the same size, thickness, rated current and resistance. We hold no datasheet to say whether the two are the same part under two names, and we will not claim it.
What do we not know about these inductors?
Most of what a qualification file needs. We hold 28 Walsin datasheets, 451 pages, 26 for MLCC and 2 for chip resistors, and none covers an inductor: the inductor line has zero datasheets on our file, so the automotive marker, the temperature range and the saturation current are all unconfirmed.
What will we not tell you about Japan?
Anything about Japanese automotive qualification, customs or trade rules. We hold no office, entity or stock in Japan; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We state no duty, customs procedure or transit time, and give no legal or compliance advice; confirm with your compliance team. We hold neither ISO 9001 nor IATF 16949, and we make no statement about any named maker.
How Venatech helps
Start with the free tool. Paste your incumbent inductor 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 up to 500 lines to the BOM checker. The Hong Kong ready-stock list is a dated snapshot, 23 September 2026, never live-synced.
Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We work from Hong Kong, in small lots, with cross-referencing help, and you can request a quote through the site. Lot and date-code traceability and a certificate of conformity per shipment are on request. The tables came from our own export; the inductor range lists the families, and our post on multilayer against wirewound chip inductors helps choose the construction. Qualification stays with you.
The short version
The automotive-marked Walsin inductors are small signal parts and beads, 289 rows, none above 120 nH and none with a saturation current. A supply rail finds its inductor in 171 unmarked rows, 118 of which state no saturation current, and the one stocked 2.2 uH line is among them.
Send us one inductor line from your head-unit bill of materials and we will return the Walsin candidates with every difference stated. If your rail needs a saturation current in writing, are you willing to ask Walsin for it before the design freeze?
Sources
Fetched 23 October 2026. The vehicle-output statement comes from the page below; every part figure comes from our own Walsin inductor export and stock list.
- SteelOrbis, “Japanese auto output up 3.7 percent in Jan-Jul 2026”, 6 October 2026, citing JAMA: https://www.steelorbis.com/steel-news/latest-news/japanese-auto-output-up-37-percent-in-jan-jul-2026-1481832.htm
Frequently asked questions
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Which Walsin inductors are marked automotive?
Two series names carry the word, 289 of 5,410 rows: the 139-row MCI Automotive Series of signal inductors up to 120 nH, and the 150-row MCB / MHC Automotive Series of ferrite beads. We hold no inductor datasheet, so we cannot say what the marker certifies.
Is there an automotive-marked Walsin power inductor?
Not by series name. None of the 289 automotive-marked rows exceeds 120 nH, so none is a buck inductor. The 171 rows at 1 to 4.7 uH and 2 A or more sit in 13 series with no automotive marker. Ask Walsin for any qualification it holds.
Do Walsin power inductors state a saturation current?
On 53 of 171 rows, all CSME or CSMEA. The 118 others, including every WLPH, WQPH, WIP and WPA part in the 2.2 uH table, state rated current only. Without it, the thermal limit is known but the saturation point is not.
Which 2.2 uH inductor is on the Hong Kong shelf?
WLPH252012M2R2PP, 2520, 1.2 mm, 2.27 A, 85 milliohm, is on our list as at 23 September 2026. The snapshot is dated and not live, and it counts part numbers, not pieces. We give no stock, price or lead-time guarantee.
Why does a column filter return 18 rows and a code filter 16?
Two rows, WQPH201610M1R5PS and WPA201610S-1R5ML, carry 1R5 in the part number but 2.2 uH in the Inductance column. Check the code in the part number as well as the column before you accept a candidate.
Does this say anything about Japanese vehicle makers?
No. The JAMA output figure names no supplier, and we draw no conclusion about any maker’s parts. We hold no office in Japan and give no customs or compliance advice; confirm with your compliance team.