High Power Low TCR Current Sensor: Walsin’s TTL Export Is 6,289 Bytes and Zero Rows

We opened Walsin’s high power low TCR current sensor file ourselves rather than repeat a note that it returns nothing. It is 6,289 bytes, carries the standard nine-column header, and holds zero data rows. No TTL part number exists anywhere in the 360,078-line master part list we hold.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, holds all 20 of Walsin Technology (Walsin)’s thin film parametric export files, including High_Power_Low_TCR_Current_Sensor_TTL_Series.xlsx. A prior note said this file returns zero rows. Rather than repeat that as given, we opened the file itself — not just the row count, but the underlying archive — and this post reports what is actually inside it. Every figure below is measured from that file and from the master part-number set, not assumed.

Does Walsin’s TTL high power low TCR current sensor file actually contain any parts?

No. We opened High_Power_Low_TCR_Current_Sensor_TTL_Series.xlsx with pandas and it loads cleanly to an empty table: zero rows, nine columns — Part Number, Series, Size, Resistance, Tolerance, TCR, Rated Power, Packaging, Termination. We then went a level below the spreadsheet reader and inspected the file’s own internal XML. One worksheet, one header row, A1 through I1, and a sharedStrings.xml holding exactly nine strings — the nine column names and nothing else. There is no hidden second sheet, no filtered-out data, no formula referencing rows that do not render. The file is not broken; it is complete, and it is empty.

What we checked	Result
File size	6,289 bytes
Data rows (pandas)	0
Columns present	9 (Part Number, Series, Size, Resistance, Tolerance, TCR, Rated Power, Packaging, Termination)
Worksheets in the archive	1
Shared strings in the archive	9 — the nine column headers, no data strings
TTL part numbers in Venatech’s 360,078-line master list	0

Is the empty TTL file broken, or is it part of the same process that built the other 19 exports?

Part of the same process, and we can show the minute it happened. Every Excel file carries a creation timestamp in its own metadata. We read that timestamp out of all 20 thin film export files, and the TTL file’s is 2026-09-19T10:13:46Z — sitting inside an unbroken 111-second run that starts at 10:13:23Z and ends at 10:15:14Z across all 20 files, in the same alphabetical order they sort in today.

TTL is not isolated in that sequence. The file created immediately before it, Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_Series_2.xlsx, returned 14,810 real rows. The file created immediately after it, Tantalum_nitride_Thin_Film_Chip_Resistor_MF_Series_0.xlsx, is itself empty, and the one after that, MF_Series_1.xlsx, returned 20,520 real rows. A working export and a failing one sit on either side of TTL, seconds apart, from the same automated run. That is the strongest evidence we have that TTL’s emptiness is a real answer from Walsin’s system, not a transfer fault on our side.

File created around TTL	Timestamp (UTC)	Rows returned
SF_Series_2.xlsx	10:13:35	14,810
High_Power_Low_TCR_Current_Sensor_TTL_Series.xlsx	10:13:46	0
MF_Series_0.xlsx	10:13:52	0
MF_Series_1.xlsx	10:13:54	20,520

Does a TTL part number exist anywhere else in Venatech’s data?

We checked three places and found it in none of them. First, the master part-number file we verify every blog draft against — 360,078 lines, built from all eight Walsin parts extracts plus both stock files — contains zero part numbers starting TTL. Second, the 23 September 2026 ready-stock snapshot of 1,125 part numbers held in Hong Kong contains none. Third, our 28 Walsin datasheet PDFs — 451 pages, covering 26 MLCC series and 2 chip resistor series — contain no TTL filename and no current-sensor datasheet of any kind; thin film holds zero of those 28. TTL is not merely absent from one export file. It is absent from every document Venatech holds.

What would a high power low TCR current sensor file actually need to publish?

A resistance range low enough to sense current without dropping much voltage, and a TCR tight enough that the sensed value does not drift with self-heating. Walsin’s own schema for every thin film file — including the empty TTL one — only has nine columns, and a current-sense part specifically needs at least one more: a power rating high enough to survive continuous load current, which the schema does carry as Rated Power, and ideally a four-terminal Kelvin connection flag, which no thin film export column records at all. Even if TTL returned rows tomorrow, the schema it would arrive in cannot state whether a part is four-terminal.

The two real series that come closest to “high power, low TCR” in what we actually hold are SF anti-sulfuration at 2010 and MF tantalum nitride at 1206 — neither marketed as a current sensor, both rated for more power than Walsin’s own WF precision line at the same footprint.

Part number	Series	Case size	Resistance	TCR	Rated power	Match / mismatch vs “high power, low TCR, current sensing”
SF20R1172BTL	SF anti-sulfuration	2010 (5025)	11,700 Ω	≦±25 ppm/°C	3/4 W	Mismatch — not low-ohm, not marketed for current sensing
SF12T1R00ATL	SF anti-sulfuration	1206 (3216)	1.00 Ω	≦±50 ppm/°C	1/8 W	Match on low resistance; mismatch — power is modest, no Kelvin terminal field
MF12Q10R0ATL	MF tantalum nitride	1206 (3216)	10.0 Ω	≦±50 ppm/°C	2/5 W	Match on power step up from WF; mismatch — no TTL-grade TCR exists to compare against

None of these three is a current sensor. We will not tell you a part is equivalent to one that, as far as our data shows, does not exist. We will show you where each real candidate falls short of the brief TTL’s own series name describes, rather than implying a substitute.

Is TTL the only empty file of its kind, or part of a wider pattern?

One of nine. We counted every thin film export file by hand: 20 total, 11 return data, 9 return zero rows. The nine are Anti_Sulfuration_AEC_Q200_Thin_Film_Chip_Resistor_SF.xlsx, Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_A_Series.xlsx, Anti_Sulfuration_Thin_Film_Chip_Resistor_SF_Series_0.xlsx, the TTL file itself, Tantalum_nitride_Thin_Film_Chip_Resistor_MF_Series_0.xlsx and _MF_Series_2.xlsx, Thin_Film_Precision_Chip_Resistor_WF_Series_0204.xlsx and _0207.xlsx, and Thin_Film_Professional_AEC_Q200_Chip_Resistor_WF_Q_S.xlsx. All nine, including TTL, are exactly 6,289 bytes — the same size, generated by the same template, down to the byte count. TTL is the only one of the nine named for an application (current sensing) rather than a case size or a qualification grade, which is why its absence reads as a bigger gap than an empty 0204 or 0207 case-size file does.

What should a buyer looking for a Walsin current sensor do instead?

Ask us to put the request to Walsin directly, because nothing in our data can answer it today. We hold zero rows, zero part numbers and zero datasheet pages for the TTL series — there is nothing to parse a specification out of, and we would rather say that plainly than guess at a TCR figure from the series name.

1. Do not spec “TTL” into a BOM. No part number starting TTL exists in our 360,078-line master list, and a design review that assumes one will stall at sourcing.
2. Tell us the actual current, voltage drop and TCR budget your sensing circuit needs. We can check it against SF, MF and WR/MR shunt options we do hold data for, honestly stating where each one falls short of a dedicated current-sensor spec.
3. Cross what you do have. Paste up to 500 part numbers or drop an Excel or CSV into the free cross-reference tool. It decodes 18 manufacturers’ part numbers and matches against 800,000+ crossable Walsin part numbers.
4. Check ready stock on ready stock for what is physically in Hong Kong — a dated snapshot as at 23 September 2026, not a live feed, and currently zero TTL parts because there are zero TTL parts to hold.

For the other eight empty thin film exports and what they were meant to contain, see Walsin thin film availability: why nine of twenty exports return nothing. For what the eleven populated files actually cover, see What is actually in Walsin’s thin film catalogue. The full range is on the Walsin thin film range page.

The short version

Walsin’s high power low TCR current sensor file is real, complete and empty: 6,289 bytes, nine correct column headers, zero data rows, created at 10:13:46 UTC on 19 September 2026 inside an unbroken 111-second batch that produced 14,810 real rows in the file immediately before it and 20,520 in the file two steps after it. No TTL part number exists in our 360,078-line master list, our 1,125-line ready-stock snapshot or our 451 pages of Walsin datasheets. The absence is the finding, and we are stating it rather than filling the gap with a part that is not there.

If you need a Walsin current sensor, tell us the current, voltage drop and TCR budget and we will check it honestly against the thin film and thick film parts we do hold data for — and we will put the TTL series itself to Walsin directly, on your request, rather than guess at what an empty file was supposed to contain.

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Frequently asked questions

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