A 2.2uH power inductor search in Walsin’s export returns 56 rows. We kept the 36 credible rows rated 2 A or more and grouped them by height, DC resistance and current: they collapse to 18 distinct electrical choices, because the same part is listed under two to four part numbers. Only 10 of the 56 publish a saturation current.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at a power supply, charger or power-conversion maker in Manila or Calabarzon, the Philippines, choosing a buck or boost inductor. Walsin Technology (Walsin) is the only line we are authorised for. We re-measured Walsin’s inductor export, Walsin_Inductor_ALL.xlsx, on 11 November 2026: 5,411 rows, of which 5,410 are real parts after the known test row, and 146 publish a saturation current. Every part number is real.
What is happening in Calabarzon’s power and passive component industry?
Capacity is being added on both sides of the board. Context.ph reported on 21 September 2026 that Samsung Electro-Mechanics Philippines submitted a project of about 2 billion pesos to PEZA for a new building at Calamba Premiere International Park in Laguna, to expand its inductor business for automotive, AI and high-performance computing uses.
On 20 April 2026 Context.ph reported that onsemi plans a brownfield expansion in Cavite, Cebu and Tarlac for power semiconductors aimed at hyperscale data centres, AI infrastructure and electric vehicles, with more than 6,000 workers in the country. We fetched both on 11 November 2026; the figures are theirs. Our conclusion is ours: Calabarzon builds and uses power stages, and a second source for a power inductor is a routine request there. We have no relationship with either company and say nothing about what they buy.
How many Walsin 2.2uH power inductor rows carry 2 A or more, and how many are really different?
Eighteen real choices from 36 rows. We filtered Walsin_Inductor_ALL.xlsx for 2.2 uH: 56 rows; 38 rate 2 A or more, 2 of which we set aside as implausible; the other 36 fall into 18 groups when we match height, DC resistance and rated current.
The duplication follows series pairs. WLPH parts reappear as WIP, WQPH as WPA, and in one case four part numbers, WLPH201610M2R2PS, WQPH201610M2R2PS, WIP201610S-2R2ML and WPA201610S-2R2ML, all state 117 milliohm and 2.2 A in a 2.0 by 1.6 by 1.0 mm body. That WLPH and WIP twin is already in our earlier Indonesian power-bank post; the count for a single 2.2 uH line is ours, and we have not seen it anywhere. Read twins as one candidate with several codes, and confirm with Walsin which code is current.
Which Walsin parts cross a 2.2 uH, 2.5 A, 2520, 1.2 mm brief, and what differs?
Two codes, one electrical part. We filtered the 36 rows for 2.5 A in a 2.5 by 2.0 mm body: WLPH252012M2R2PS and WIP252012S-2R2ML match at 1.20 mm high and 74 milliohm; WQPH252012M2R2PS and WPA252012S-2R2ML state the same 74 milliohm and 2.5 A but 1.00 mm.
Put your incumbent in the last column.
| Walsin part | Body (mm) | DCR (milliohm) | Rated current | Saturation current published | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|---|
WLPH252012M2R2PS |
2.5 x 2.0 x 1.20 | 74 | 2.5 A | No | Match on value, size, height, current | |
WIP252012S-2R2ML |
2.5 x 2.0 x 1.20 | 74 | 2.5 A | No | Match: same electrical row, different code | |
WQPH252012M2R2PS |
2.5 x 2.0 x 1.00 | 74 | 2.5 A | No | Mismatch on stated height, though the code reads 2520-12 | |
WLPH252012M2R2PP |
2.5 x 2.0 x 1.20 | 85 | 2.27 A | No | Mismatch: 2.27 A against 2.5 A; on our shelf as at 23 September 2026 | |
WIP322512A-2R2ML |
3.2 x 2.5 x 1.10 | 60 | 3 A | No | Mismatch: larger body; more current | |
AIP0420MB-2R2M |
4.4 x 4.2 x 1.80 | 58 | 4.5 A | No | Mismatch: much larger body |
Rated current in an inductor export is usually a temperature-rise figure. It does not tell you where inductance collapses. Confirm against both datasheets and test at your ripple current; see rated current versus saturation current in chip inductors.
How many 2.2 uH rows publish a saturation current?
Ten of 56. We counted the 2.2 uH rows in Walsin_Inductor_ALL.xlsx with a value in the saturation current column: 2 in MIP-H, 0.23 A and 0.55 A, and 8 in the CSME, CSMEA and CSMM moulded families, from 3 A to 6 A, such as CSMM0420D-2R2M at 6 A.
None of the 2.5 by 2.0 mm parts in the table publishes one. For a buck converter that runs near its peak current, that gap decides whether the export alone is enough. It is not. Ask us to request the datasheet for the exact part number from Walsin.
Which 2.2 uH rows should you not trust as printed?
Four kinds, by our reading. In Walsin_Inductor_ALL.xlsx we found 2 WLFI rows rating 15 A and 30 A at 1.15 and 0.65 ohm, 5 CSME-family rows printing 18.2 to 42 ohm DCR beside 2.2 to 4.5 A, 2 parts coded 1R5 listed at 2.2 uH, and WQPH and WPA 2520 rows stating a 2.0 by 1.6 mm body.
The two coded 1R5, WQPH201610M1R5PS and WPA201610S-1R5ML, would read as 1.5 uH from the part number, yet the Inductance column says 2.2. WLFI2012Z0M2R2TB at 30 A and 0.65 ohm would dissipate several hundred watts; a milliamp-to-amp slip is the likely reading. The CSME ohm-for-milliohm slip, for example CSME0418D-2R2M, is already in our earlier inductor posts.
How Venatech helps: what should a Philippine power electronics team do next?
Paste the inductor lines with the current you need. The free cross-reference tool, VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts; each Walsin candidate returns with every field marked match or mismatch, and differences are stated. Upload a BOM, and see the inductor range.
Worked example from our export: the 2.2 uH, 2.5 A, 2520, 1.2 mm brief returned one electrical part under two codes and a same-current part listed at a different height. One 2.2 uH line, WLPH252012M2R2PP, is on our ready stock list as at 23 September 2026, a dated snapshot that is never live-synced; the rest are to order. We serve from Hong Kong, welcome small lots, and you request a quote through the site. We hold no office, entity or stock in the Philippines and give no customs advice; confirm with your compliance team.
The short version
- 56 Walsin rows at 2.2 uH; 36 credible rows at 2 A or more; 18 distinct electrical choices.
- Twin series list the same part under two to four codes.
- Only 10 of 56 publish a saturation current.
- Two 1R5-coded parts sit at 2.2 uH in the export; check before ordering.
- One 2.2 uH line,
WLPH252012M2R2PP, is on our 23 September 2026 shelf.
Send us your inductor line with value, current, body and height, and we will return the Walsin candidates with every difference stated.
Sources, fetched 11 November 2026:
- Context.ph, “Samsung lines up P2B inductor project in Laguna”, 21 September 2026: https://context.ph/2026/09/21/samsung-lines-up-p2b-inductor-project-in-laguna/
- Context.ph, “onsemi plans Philippines expansion via brownfield investment”, 20 April 2026: https://context.ph/2026/04/20/onsemi-plans-philippines-expansion-via-brownfield-investment/
Frequently asked questions
How many Walsin 2.2uH power inductor part numbers rate 2 A or more?
38 of 56 rows. We set aside 2 WLFI rows whose current cannot be right; the other 36 fall into 18 distinct electrical choices by height, DC resistance and rated current, because twin series repeat the same part.
Which Walsin part matches 2.2 uH, 2.5 A, 2520, 1.2 mm?
WLPH252012M2R2PS and WIP252012S-2R2ML, both 74 milliohm and 2.5 A at 1.20 mm, are one electrical part under two codes. Confirm against the datasheet and test at your ripple current.
Do Walsin 2.2 uH power inductors publish saturation current?
Ten of 56 rows do: 2 MIP-H parts and 8 in the CSME, CSMEA and CSMM families, from 3 A to 6 A. None of the 2520 thin-film power parts in our table publishes one. Request the datasheet.
Why do some Walsin inductor codes ending in 1R5 show 2.2 uH?
WQPH201610M1R5PS and WPA201610S-1R5ML are listed at 2.2 uH in the export, though the code reads 1.5 uH. We cannot tell which is right. Ask Walsin to confirm before you order.
What is Samsung building in Laguna?
Context.ph reported on 21 September 2026 that Samsung Electro-Mechanics Philippines filed a project of about 2 billion pesos with PEZA to expand its inductor business at Calamba. Those are the report’s figures, not ours.
Do you hold 2.2 uH inductor stock or an office in the Philippines?
One 2.2 uH line, WLPH252012M2R2PP at 85 milliohm and 2.27 A, is on our Hong Kong shelf as at 23 September 2026. We have no office, entity or stock in the Philippines; ask through the site for current availability.