Karnataka plans 1 GW of data centre parks, 500 MW of it near Bengaluru. For the current sense resistor in every rack supply, Venatech, Walsin’s authorised distributor in Hong Kong, crosses your incumbent shunt to 1,188 Walsin metal current-sense part numbers, including 58 at 1 milliohm or below and 156 rated 3 W in 2512.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for power-supply and rack-power engineers in Bengaluru, Hoskote and Mysuru, and for the buyers who place their orders. Walsin Technology (Walsin) is the line we are authorised for, and our VenaMatch tool decodes 18 manufacturers’ part numbers into Walsin crosses. The Walsin side below is our own export file, Metal_Low_Ohm_Current_Sense_Chip_Resistor__1of1.xlsx, which we re-measured on 11 November 2026. Every part number quoted is real and appears in that file.
What is Karnataka planning for data centres around Bengaluru?
A 1 GW programme across three cities, with 500 MW at Bengaluru. W.Media reported on 7 May 2026 that Karnataka plans three sustainable data centre parks with a combined 1 GW, including a 500 MW park near Hoskote that will take solar power from Pavagada, with the remaining capacity split between Mangaluru and Mysuru.
The W.Media report, which we read on 11 November 2026, says the Bengaluru Water Supply and Sewerage Board can supply 60 million litres a day of treated water to the park, and that about 350 acres in the Baikampady Industrial Area at Mangaluru have been identified. It also cites a Mordor Intelligence estimate that Bengaluru’s data centre market was about 203.17 MW in 2025 and could reach 398.22 MW by 2031. These are the state’s plans and a third party’s forecast as reported, not our figures.
Why does a 1 GW build-out matter for the current sense resistor?
Because every megawatt passes through supplies that measure their own current. A server power supply, a 48 V to 12 V bus converter, a hot-swap controller and a battery backup unit each carry at least one low-ohm current sense resistor, and at rack currents of 40 to 60 A that resistor is a power part as much as a measurement part.
The arithmetic is simple and it decides the case size. At 40 A, a 1 milliohm shunt dissipates 1.6 W (40 squared times 0.001). At 60 A, a 0.5 milliohm shunt dissipates 1.8 W. Both sit comfortably inside a 3 W 2512 rating with margin for derating at board temperature, and both would overload a 1 W part. Read the power derating curve on Walsin’s datasheet for the exact part before you fix the value; our post on chip resistor power rating by case size explains the method.
How many Walsin metal current sense resistors can Venatech cross to?
1,188, across five series. We counted 1,188 distinct Walsin metal low-ohm current sense part numbers in our export: 322 metal foil power-sensing parts, 448 metal plate parts and 418 metal plate parts labelled automotive, from 0.5 milliohm to 0.7 ohm.
By rated power, 156 are 3 W, 320 are 2 W, 502 are 1 W, 46 are 3/4 W, 155 are 1/2 W and 9 are 1/3 W. All 156 of the 3 W parts are 2512. By tolerance, 721 are plus or minus 1 percent, 32 are plus or minus 0.5 percent and 435 are plus or minus 5 percent. By temperature coefficient, 612 are rated 50 ppm per degree C or better. That breadth is what makes a cross useful: you can usually hold value, case size and wattage and still pick a tolerance and TCR.
| Brief from a rack-power BOM | Walsin part | Size, value, power | Tolerance, TCR | Match / mismatch | On our shelf, 23 Sep 2026 |
|---|---|---|---|---|---|
| 0.5 milliohm, 2512, 3 W | WW25AR0L5FTL |
2512, 0.0005 ohm, 3 W | 1%, 70 ppm | Match | Request a quote |
| 1 milliohm, 2512, 3 W | WW25BR001FTL |
2512, 0.001 ohm, 3 W | 1%, 70 ppm | Match | Request a quote |
| 1 milliohm, wide terminal | WW25YR001FTL |
1225, 0.001 ohm, 2 W | 1%, 100 ppm | Match; mismatch on footprint against a 2512 pad | Request a quote |
| 1 milliohm, compact, 1 W | WW12YR001FTL |
0612, 0.001 ohm, 1 W | 1%, 100 ppm | Match | Request a quote |
| 2 milliohm, 2512, 2 W | WW25RR002FTL |
2512, 0.002 ohm, 2 W | 1%, 75 ppm | Match | Request a quote |
| 5 milliohm, 1206, 1 W | WW12RR005FTL |
1206, 0.005 ohm, 1 W | 1%, 70 ppm | Match | Request a quote |
None of these lines was in our Hong Kong ready stock snapshot as at 23 September 2026, so request a quote and we source them through our authorised Walsin channel. We make no lead-time promise.
Which Walsin shunts reach 1 milliohm and below?
Fifty-eight part numbers. We counted 58 Walsin metal current sense resistors at 1 milliohm or below in our export: 6 at 0.5 milliohm, the rest at 0.75 and 1 milliohm, in 0306, 0612, 1206, 1225 and 2512 cases.
The 0.5 milliohm parts are the ones a 12 V or 54 V rail designer reaches for when the drop across the shunt has to stay small. WW25AR0L5FTL is 2512 at 3 W; the same value also appears in 0612 at 1 W and 1225 at 2 W. Below about 1 milliohm the copper of your pads and traces adds resistance of the same order as the part, so the value on the label is only part of the answer.
What layout does a sub-milliohm current sense resistor need?
A Kelvin (four-wire) sense connection at the pads. At 1 milliohm, a few hundred micro-ohms of solder and copper in the sense path is an error of tens of percent, so route the two sense traces from the inner edge of each pad, away from the current path, and check the recommended land pattern on Walsin’s datasheet.
Three further checks belong on the review list. First, TCR: copper itself drifts by roughly 3,900 ppm per degree C, so the metal-alloy rating of 50 to 100 ppm only helps if the copper stays out of the measurement. Second, the wide-terminal 1225 and 0612 parts spread heat into the board along the long side, which helps in a dense 1U supply; they are not a pad-for-pad swap for 2512. Third, pick automotive-labelled parts, whose codes end in J such as WW25NR005JTLJ (2512, 5 milliohm, 2 W), only when your customer asks for them. Our post on what resistor TCR actually buys you covers the drift budget.
How can Venatech help a Bengaluru power team?
How Venatech helps is simple: one authorised Walsin channel, and a free tool that does the decoding. VenaMatch at /cross-reference/ decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, returning every field marked match or mismatch, so a shunt from another brand comes back with its Walsin value, case and wattage side by side.
Paste up to 500 part numbers, drop an Excel or CSV file, or upload a full BOM at /bom/. Browse the chip resistor range, check the dated ready stock list (snapshot as at 23 September 2026, never live-synced), and request a quote through the site. We serve from Hong Kong in small lots, with fast quotes. We hold no office or entity in India, give no legal or customs advice, and qualification stays with you.
The short version
- Karnataka plans 1 GW of data centre parks, 500 MW near Hoskote, per W.Media on 7 May 2026.
- Venatech crosses to 1,188 Walsin metal current sense resistors, 58 of them at 1 milliohm or below.
- 156 Walsin metal shunts are rated 3 W, all in 2512.
- At 40 A a 1 milliohm shunt dissipates 1.6 W: size the case for it and lay out a Kelvin connection.
Paste your shunt part numbers into the free cross-reference tool and read each field as match or mismatch.
Frequently asked questions
What is Karnataka’s data centre park plan?
Per W.Media on 7 May 2026, Karnataka plans three sustainable data centre parks with a combined 1 GW, including a 500 MW park near Hoskote in Bengaluru powered by solar from Pavagada, with the rest at Mangaluru and Mysuru.
How many Walsin current sense resistors does Venatech cross to?
We counted 1,188 distinct Walsin metal low-ohm current sense part numbers in our export, re-measured on 11 November 2026, from 0.5 milliohm to 0.7 ohm. Venatech is Walsin’s authorised distributor in Hong Kong.
Is there a Walsin 1 milliohm 2512 current sense resistor?
Yes. WW25BR001FTL is 2512, 0.001 ohm, 3 W, plus or minus 1 percent, 70 ppm per degree C. Request a quote; we source it through our authorised Walsin channel.
What power rating does a 1 milliohm shunt need at 40 A?
It dissipates 1.6 W at 40 A, so a 2 W part is tight and a 3 W 2512 part gives derating margin. Check the derating curve on Walsin’s datasheet at your board temperature.
Why does a sub-milliohm resistor need a Kelvin connection?
Because solder and copper in the sense path add resistance of the same order as the part. Route the sense traces from the inner pad edges, away from the current path.
Can Venatech guarantee stock or lead time for metal shunts?
No. We give no price, lead-time or stock guarantee. The ready stock list is a snapshot as at 23 September 2026; request a quote through the site for current availability.
Related reading
- Chip resistor power rating by case size
- What resistor TCR actually buys you
- What an authorised distributor means and how to verify one
- Free cross-reference tool, 800,000+ crossable parts, and ready stock, snapshot as at 23 September 2026
Last reviewed 11 Nov 2026. Sources: W.Media, “Karnataka plans three sustainable data center parks with combined capacity of 1 GW”, 7 May 2026 (w.media, fetched 11 Nov 2026); Venatech Walsin metal current sense export and ready stock list as at 23 September 2026, re-measured 11 Nov 2026.