Walsin Power Inductors Above 1A: A Checklist

1,118 of Walsin Technology (Walsin)’s 5,410 real inductor part numbers publish a rated
current of 1 A or higher. Reaching that count takes a correction first: 71 rows export
Rated Current as a bare number with no unit at all, and cross-checking those against
sibling part numbers that do carry a unit shows the bare figure is milliamps, not amps or a
stray integer. Skip the correction and you will misread some of the largest parts in the
catalogue as the smallest.

Venatech Limited, an authorised Walsin distributor in Hong Kong, holds Walsin’s full
5,410-row inductor parametric export (5,411 rows as delivered, less one known QA test row).
Venatech holds no Walsin inductor datasheet PDF, and 208 parts across the VEFL, WIP, SCM,
SCA and BIH series have no datasheet at all. Confirm every figure below against Walsin’s own
documentation before design-in. Every part number is real.

How many Walsin inductors clear 1A rated current?

1,118 of 5,410, once two corrections are applied: converting 71 unit-less rows to
milliamps and excluding 30 WLFI Series rows whose exported current is physically
implausible for their package size (covered in Shielded vs unshielded chip
inductors). Without those two steps, a
straight read of the Rated Current column would either drop the 71 unit-less rows from any
numeric filter entirely, or worse, read a bare “1000” as 1,000 A instead of 1 A.

Why can’t you just filter the Rated Current column directly?

Because 71 of 5,410 rows carry no unit character at all — not “A,” not “mA,” just a bare
number. They sit in three series: WLCM (41 rows), WLBD (16 rows) and WLBD(HC) (14 rows). A
numeric filter that strips non-digit characters will either skip these rows or misread
them by three orders of magnitude.

The correction is checkable inside the data itself. WLBD(HC) Series exports the same
physical part twice under two packaging suffixes, TH and PH, and the PH rows carry a
proper unit while the matching TH rows do not:

Every TH/PH pair we can match this way agrees exactly once the bare TH number is read as
milliamps: 6000 = 6 A, 1000 = 1 A, 2500 = 2.5 A, 9000 = 9 A. The same pattern holds across
all 71 affected rows in WLCM and WLBD. We apply that correction throughout this post.

Which sizes carry the most parts above 1A?

The top two sizes alone account for 346 of the 1,118 parts, or 31%. 1.6×0.8 mm (the
1608/0603 case) is the single most common footprint above 1A in the export, not the larger
power-inductor sizes further down the list.

What is the smallest Walsin inductor that clears 1A?

1.0×0.5 mm — the 1005(0402) case — at 104 parts. The two smallest examples:

No part at the smaller 0603(0201) case clears 1 A anywhere in the export. If your design
needs both the smallest possible footprint and 1 A or more, 1005(0402) is the floor Walsin’s
catalogue currently offers.

What should I check before trusting a rated-current figure above 1A?

Three things, in order. First, check whether the part number falls in WLCM, WLBD or
WLBD(HC) — if so, confirm whether the Rated Current cell carries a unit, and if it does
not, treat it as milliamps per the correction above. Second, check whether the series is
WLFI at an inductance of 1.0 µH or above, where 30 of 44 rows carry an exported value we
could not verify as physically plausible; treat those as unconfirmed rather than as
qualifying parts. Third, remember that rated current is a thermal figure, not a saturation
figure — for a switching application, cross-check against Choosing an inductor for a buck
converter before finalising a part at or
near its rated limit. The full range is on the Walsin inductor page.

The short version

1,118 of 5,410 real Walsin inductor part numbers clear 1 A rated current, concentrated at
the 1.6×0.8 mm and 2.92×2.79 mm footprints. Getting that count right required correcting 71
rows that export Rated Current with no unit at all, verified as milliamps by cross-checking
matching part-number stems, and excluding 30 WLFI rows with an implausible figure. The
smallest footprint that clears 1 A is 1.0×0.5 mm.

Send us your target current and footprint and we will run the corrected numbers against
your BOM, not the raw export.

Already holding a part number? Paste it into the cross-reference tool — it reads the manufacturer from the number itself, returns the Walsin inductor candidates and states every field that differs rather than calling anything an alternative. Then check Hong Kong ready stock to see what is on the shelf today.

Frequently asked questions