Solar battery storage electronics for Pakistan need a current-sense shunt at a few milliohm, and the Walsin Technology (Walsin) export lists 638 metal plate parts at 10 milliohm or less against only 34 in thick film. A 5 milliohm, plus or minus 1 percent brief returns 43 metal parts, and none of the 1,188 metal parts is on our shelf.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from the Walsin chip resistor export (234,815 rows, 234,401 distinct part numbers) and our stock list as at 23 September 2026. It is for a design or sourcing engineer at a Pakistani inverter, battery pack or storage assembler who is crossing a low-ohm shunt. Every part number is real and every count is ours, re-measured on 10 November 2026. The market statements name their sources and the day we fetched them.
What did Karachi’s press report about local lithium battery production, and why does a component buyer care?
It reported battery lines in Korangi, both for solar backup and for two-wheelers. According to ARY News on 12 April 2026, a Karachi engineering firm planned a lithium cell plant in the Korangi Industrial Area with an initial capacity of 4 megawatts, enough for about 2,000 e-bikes and e-scooters a month, and ProPakistani reported in a 13 May 2026 article that Zilo Lithium Batteries had installed a lithium-ion assembly line in Korangi for LiFePO4 solar backup batteries.
Those are the reports’ figures, not ours. The ProPakistani page states no capacity or investment, and its date is the one in its web address. The conclusion we draw is ours: every assembled pack needs a battery management board, and the board needs a current-sense element sized in milliohm. We have no relationship with either company or any Pakistani maker, and we say nothing about what any of them buys.
Which Walsin low-ohm resistors match a 5 milliohm, plus or minus 1 percent, 2512, 2 W brief, and what differs?
Two match on every export field, and six more come close. We parsed the 11,616 low-ohm rows (1,188 metal plate, 10,428 thick film) and found 43 metal plate parts at 5 milliohm and plus or minus 1 percent; 11 of them hold 50 ppm per degree Celsius or better, and only 2 of those 11 are 2512 at 2 W: WW25NR005FTL and WW25NR005FTLJ.
Our brief is ours: at 20 A, 5 milliohm dissipates 2 W, which is why the power column matters. The reader’s incumbent goes in the last column.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|
WW25NR005FTL |
Metal plate low-ohm, 2512, 5 milliohm, plus or minus 1%, 2 W, 50 ppm or better | No | Match on size, value, tolerance, power and coefficient | |
WW25NR005FTLJ |
Metal plate low-ohm, 2512, 5 milliohm, plus or minus 1%, 2 W, 50 ppm or better | No | Match on the export fields; mismatch in suffix (J), meaning not stated in the export | |
WW25MR005FTL |
Metal plate low-ohm, 2512, 5 milliohm, plus or minus 1%, 1 W, 50 ppm or better | No | Mismatch: rated 1 W, half the brief | |
WW25RR005FTL |
Metal plate low-ohm, 2512, 5 milliohm, plus or minus 1%, 2 W, 75 ppm | No | Mismatch: coefficient is 75 ppm, looser | |
WW25AR005FTL |
Metal plate low-ohm, 2512, 5 milliohm, plus or minus 1%, 3 W, 70 ppm | No | Mismatch: coefficient is 70 ppm; power is higher | |
WW15WR005FTL |
Thick film low-ohm, 0815, 5 milliohm, plus or minus 1%, 1 W, 200 ppm | No | Mismatch in construction, size, power and coefficient | |
WW08WR270FTL |
Thick film low-ohm, 0805, 0.27 ohm, plus or minus 1%, 1/4 W, 100 ppm | Yes | Mismatch: 0.27 ohm, not 5 milliohm; the only shelf family in low-ohm |
A match in the table is a match on the export fields, no more. Confirm against both datasheets and qualify in your own circuit. Our post on low-ohm current sense, thick film against metal explains the construction trade-off, and tolerance, TCR and dielectric codes decoded covers the coefficient notation.
Is thick film an option for a shunt at 10 milliohm or below?
Rarely. In the same export 638 of the 1,188 metal plate parts sit at 10 milliohm or less, against 34 of the 10,428 thick film parts; the lowest thick film value is 5 milliohm, on 2 parts, both 0815 with a coefficient of 200 ppm.
The metal plate family reaches 0.5 milliohm in 2512, 1225 and 0612, and its coefficient is 50 ppm or better on 612 of 1,188 parts. The thick film low-ohm file is looser on coefficient too, running up to 2,100 ppm. We counted this so the reader does not have to; we have not seen it counted anywhere. Paste your value into the cross-reference tool and read the coefficient before the footprint.
What does the Hong Kong shelf hold in low-ohm resistors?
Three thick film parts and no metal plate. Of the 1,188 metal plate parts, 0 are on our stock list as at 23 September 2026; of the 10,428 thick film parts, 3 are, all 0805 at plus or minus 1 percent: WW08WR270FTL (0.27 ohm), WW08WR390FTL (0.39 ohm) and WW08WR470FTL (0.47 ohm).
None is in the shunt range. The ready stock list is a dated snapshot, never live-synced, and the chip resistor range lists the families. If your brief is a milliohm shunt, ask for a to-order enquiry through the site; we will say plainly what we hold and what we do not.
Do the tolerance letters in low-ohm part numbers always agree with the Tolerance column?
Almost always, and three times they do not. We read the tolerance letter in 11,531 low-ohm part numbers and compared it with the Tolerance column: WW20MR015FTL and WW15WR010FTL carry F (plus or minus 1 percent) but read plus or minus 5 percent, and WW15WR005JTL carries J (plus or minus 5 percent) but reads plus or minus 1 percent.
Another 85 rows in the 11,616 have no parsable letter. Three in 11,531 is a small defect, and it matters only if a script joins on one column. Treat the part number as the key, check the datasheet for a part with a mismatch, and do not carry the column into a BOM unchecked.
What will we not tell you about battery management and inverter boards?
Anything about your pack design, your cell protection or your inverter topology. Of the 28 Walsin datasheets we hold, 26 cover MLCC and 2 cover chip resistors (the MR and WR families), so for the 11,616 low-ohm rows every count here is catalogue coverage, not suitability.
We make no claim that any part suits a battery pack, an inverter or a particular current. We hold no ISO 9001 or IATF 16949 certificate. We hold no office, entity or stock in Pakistan; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or conformity advice; confirm with your compliance team. Qualification stays with you.
How can Venatech help a Pakistani inverter or battery assembler?
How Venatech helps starts with a free paste box. The cross-reference tool (VenaMatch) decodes 18 manufacturers’ part numbers, covers 800,000+ crossable parts, accepts up to 500 part numbers or an Excel or CSV file, and shows Walsin candidates with each field marked match or mismatch. Load a whole BOM for a check. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
Worked example from our own export: the 5 milliohm, plus or minus 1 percent, 2512, 2 W, 50 ppm brief returned 2 exact parts among 43 metal plate variants at the value, none stocked, and the only shelf low-ohm family is 0.27 ohm and above. Walsin is the only line we are authorised for; Stackpole and Viking are lines we supply. We serve from Hong Kong in small lots, we help cross-reference, and you request a quote through the site.
The short version
For a Pakistani storage or inverter board, a milliohm shunt is a metal plate question: 638 metal plate parts at 10 milliohm or less against 34 thick film, 43 at 5 milliohm and plus or minus 1 percent, 2 that match a 2 W, 2512, 50 ppm brief, and none of the 1,188 on the shelf. State power and coefficient, not just the value.
Send us one shunt line from your BOM, with the value, power and coefficient you can accept, and we will return the Walsin parts with every difference stated. If your incumbent prints only 5 milliohm, do you know which of the 43 you are buying?
Sources
Fetched 10 November 2026.
- ARY News, first lithium battery manufacturing plant set to open in Karachi, 12 April 2026: https://arynews.tv/pakistan-first-lithium-battery-production-plant-to-open-in-karachi
- ProPakistani, Zilo installs lithium-ion assembly line in Korangi Industrial Area, dated 13 May 2026 in its web address: https://propakistani.pk/2026/05/13/zilo-installs-pakistans-most-advanced-lithium-ion-assembly-line-in-korangi-industrial-area/
- Walsin chip resistor export and Venatech ready-stock snapshot as at 23 September 2026, re-measured 10 November 2026 (internal files).
Related reading
- Low-ohm current sense: thick film against metal
- Tolerance, TCR and dielectric codes decoded
- Chip resistor power rating by case size
- Free cross-reference tool (VenaMatch)
- Ready stock, Hong Kong snapshot dated 23 September 2026
Last reviewed 10 Nov 2026.
Frequently asked questions
What did ARY News report about lithium batteries in Karachi in April 2026?
On 12 April 2026 it reported a plan for a lithium cell plant in the Korangi Industrial Area with an initial capacity of 4 megawatts, enough for about 2,000 e-bikes and e-scooters a month. These are the report’s figures, not ours, and we have not seen a later status report.
How many Walsin low-ohm resistors are 5 milliohm, plus or minus 1 percent?
43 metal plate parts, of which 11 hold 50 ppm per degree Celsius or better. Only WW25NR005FTL and WW25NR005FTLJ are 2512 at 2 W with that coefficient. Neither is on our shelf.
Can a thick film chip resistor replace a metal plate shunt at 5 milliohm?
Rarely. Thick film reaches 5 milliohm on just 2 of 10,428 parts, both 0815 at 200 ppm, while metal plate offers 638 parts at 10 milliohm or less. Confirm against both datasheets and qualify in your own circuit.
Which Walsin low-ohm resistors are on the Hong Kong shelf?
As at 23 September 2026, three thick film parts: WW08WR270FTL, WW08WR390FTL and WW08WR470FTL, all 0805 at plus or minus 1 percent and 0.27 to 0.47 ohm. No metal plate part is stocked. The snapshot is dated, not live.
Do the tolerance letters in Walsin low-ohm part numbers match the Tolerance column?
In 11,528 of 11,531 parsed part numbers they do. WW20MR015FTL and WW15WR010FTL carry F but read plus or minus 5 percent, and WW15WR005JTL carries J but reads plus or minus 1 percent. Check the datasheet for those.
Does the 2 W rating assume a particular current?
No. Our brief is ours: 5 milliohm at 20 A dissipates 2 W, so a 2 W part is the floor for that case. Your current, derating and board temperature decide the real requirement.
Do you hold stock or an office in Pakistan?
No. We hold no office, entity or stock in Pakistan; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen. We hold no ISO 9001 or IATF 16949 certificate and give no legal, customs or conformity advice.