Nine of Walsin Technology (Walsin)’s twenty thin film parametric export files return zero
rows. That count is already established in Venatech’s catalogue work. What has not been
shown before is that the empty rate is not even across the three thin film series — it runs
from 72.7% delivered in the WF precision line down to zero delivered in the TTL current
sensor line.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all twenty of
Walsin’s thin film parametric export files, 93,914 rows in total. Every count below is
measured file by file from that set. We hold no public datasheet for any of the three thin
film series named here — figures come from the parametric exports, not from a PDF.
How many of Walsin’s thin film exports actually return parts?
Eleven of twenty. This is already established and published: see
What is actually in Walsin’s thin film catalogue
for the full list of what the nine empty files were meant to contain. This post does not
repeat that list as new — it goes one level further, into what the completion rate looks
like broken out by series rather than as a single combined count.
The twenty files split into three series. WF precision carries 11 files, SF
anti-sulfuration carries 5, MF tantalum nitride carries 3, and the TTL current sensor line
carries 1 file on its own.
Does the empty rate differ by series?
Sharply. Treat “9 of 20 empty” as a catalogue-wide average and you miss that no series sits
near that average — each one is either much better or much worse.
| Series | Export files | Files with data | Files empty | Completion rate |
|---|---|---|---|---|
| WF precision | 11 | 8 | 3 | 72.7% |
| SF anti-sulfuration | 5 | 2 | 3 | 40.0% |
| MF tantalum nitride | 3 | 1 | 2 | 33.3% |
| TTL current sensor | 1 | 0 | 1 | 0.0% |
| All thin film | 20 | 11 | 9 | 55.0% |
Unique to Venatech’s data. The 9-of-20 empty-export figure is a blended average across
four completion rates that range from 72.7% to 0%. WF is the only series where most of the
named filter options actually return a part. TTL, the high power low-TCR current sensor
line, returns nothing in any of its export files — a completion rate of zero, not merely a
low one. This breakdown is measured from the file set and is not published anywhere else.
The practical reading: if a buyer is told “most thin film searches work,” that is true for
WF and false for TTL. The series name determines whether the public search tool is a
reliable way to find the part, not the thin film label as a whole.
One real part number from each populated series shows how differently those series behave
even though all three sit in the same thin film catalogue.
| Part number | Series | Case size | Export file completion rate | Match / mismatch |
|---|---|---|---|---|
WF02Q27R0DTL |
WF precision | 0201 (0603) | 72.7% of WF files return data | Reference part |
SF12T1R00ATL |
SF anti-sulfuration | 1206 (3216) | 40.0% of SF files return data | Mismatch — same catalogue, 32.7 points lower completion |
SF20R1172BTL |
SF anti-sulfuration | 2010 (5025) | 40.0% of SF files return data | Match with the SF part above on completion rate; mismatch on case size |
MF12Q10R0ATL |
MF tantalum nitride | 1206 (3216) | 33.3% of MF files return data | Mismatch — lowest completion rate of any series that returns data at all |
All four parts are real, orderable in the data Venatech holds, and sit in the same thin film
export set. Only the series changes, and the series is what decides how much of the public
filter actually works behind it.
What does the file-splitting pattern tell us about what Walsin expected to find?
Each series is exported in more than one file, and the split pattern is different for each,
which tells you something about what was expected to exist before the data came back.
WF is split one file per case size — Thin_Film_Precision_Chip_Resistor_WF_Series_0201_060,
..._0402_100, and so on through ..._2512_643, plus two more for sizes 0204 and 0207.
Those two size files are the ones that return nothing. The case size itself is the filter
dimension, and every size from 0201 to 2512 that is a real size in this series returns data;
0204 and 0207 do not, because no WF part is manufactured at either size.
SF and MF, by contrast, are split by an index number rather than by size — SF_Series_0,
SF_Series_1, SF_Series_2, and MF_Series_0, MF_Series_1, MF_Series_2. Those numbers
do not correspond to anything visible in the data itself; SF_Series_1 holds the 270 parts
at 1206, SF_Series_2 holds the 14,810 at 2010, and SF_Series_0 is empty. The export tool
anticipated three slices of the SF series and three of the MF series; only one SF slice per
case size turned out to hold data, and only one MF slice held any data at all —
MF_Series_1, all 20,520 parts, with MF_Series_0 and MF_Series_2 both empty. A real SF
part from the populated slice is SF20R1172BTL, 2010 (5025), 11.7 kΩ. A real MF part is
MF12Q10R0ATL, 1206 (3216), 10.0 Ω.
Which specific selections return nothing?
Named by series: the entire AEC-Q200 WF-Q professional series, the TTL high power low-TCR
current sensor series, the SF-A anti-sulfuration variant, and the WF sizes 0204 and 0207,
plus the unnamed numbered slices already covered above. All nine are detailed with what each
should have contained in
What is actually in Walsin’s thin film catalogue.
This post does not repeat that table — the point here is the completion rate it adds up to,
not the list itself.
Does an empty export mean the series does not exist?
No, and this distinction matters for being fair to Walsin. An empty parametric export means
the public search and download tool has no rows behind that filter selection today. We hold
no manufacturer affected-parts list and never claim that a series is discontinued, never
existed, or will never return data, for WF-Q, TTL, SF-A or any other Walsin line. The series
names appear on Walsin’s own pages; the gap is between what the filter implies and what the
download delivers, not a claim about what Walsin manufactures.
What should I do if I need a part from an empty export?
Ask directly rather than trusting the filter result. A zero-row export is not the same
signal as “this does not exist” — it is the same signal as “the public tool has nothing
indexed here right now.” For WF-Q automotive-qualified thin film, for the TTL current
sensor line, or for the SF-A variant, send the specification to Venatech and we will put
the question to Walsin rather than reporting the empty file as a final answer.
For sizes and series that do return data — WF from 0402 through 2512, the populated SF
and MF slices — selection can proceed directly from the parametric data. See
Thin film resistor sizes: Walsin’s WF line from 0201 to 2512
for how that data breaks down by case size. The full thin film range Venatech holds is on
the Walsin thin film resistor page.
The short version
Nine of twenty thin film exports are empty, but that single number hides a real spread: WF
delivers on nearly three-quarters of its filter options, SF on two-fifths, MF on a third,
and TTL on none at all. An empty export is a gap in the public tool, not proof the part
does not exist.
Send us the thin film specification you need, including WF-Q, TTL or SF-A if that is what
the datasheet calls for, and we will check it against Walsin directly rather than reporting
a blank search result as the final answer.
Already holding a part number? Paste it into the cross-reference tool — it reads the manufacturer from the number itself, returns the Walsin thin film resistor 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
How many of Walsin’s thin film parametric exports return data?
Eleven of twenty. The other nine return a header row and no parts. This figure is already established in Venatech’s catalogue overview of the thin film range, counted from all twenty files Venatech holds.
Is the empty rate the same across WF, MF and SF?
No. WF returns data on 8 of its 11 export files, a 72.7% completion rate. SF returns data on 2 of 5 (40.0%). MF returns data on 1 of 3 (33.3%). The TTL current sensor series returns data on 0 of its 1 file — a 0% completion rate, the only series with none.
Does Walsin’s TTL current sensor series exist?
Walsin names a High Power Low TCR Current Sensor TTL series, but every row of its parametric export is empty. Venatech holds no public datasheet for it and makes no claim about whether it is in current production. Ask Walsin directly before specifying against it.
Why are some thin film export files split by case size and others by a plain number?
WF’s files are named by case size — 0201, 0402, and so on through 2512, plus 0204 and 0207, which return nothing. SF and MF are split into files numbered 0, 1 and 2 instead, and in both families only one of the three numbered slices actually holds parts. The numbering does not correspond to a visible field in the data.
Does a zero-row export mean the part is discontinued?
No. We hold no manufacturer affected-parts list and never claim a series is discontinued, obsolete or constrained based on an empty export. An empty file means the public search tool has nothing indexed behind that selection on the date it was pulled, not that Walsin has stopped making the part.
What should I do if the part I need is in an empty export?
Send the specification to Venatech rather than treating the blank result as final. For WF-Q, TTL or SF-A specifically, Venatech will raise the question with Walsin directly, since the series names exist on Walsin’s own pages even though the parametric data behind them does not.
Which thin film series is the most reliable to search parametrically?
WF precision, at a 72.7% completion rate across its 11 export files. Only the 0204 and 0207 size files and the WF-Q professional series return nothing within the WF family. SF and MF are both less complete, and TTL returns nothing at all.