For the current sense resistor in a battery pack built in Indonesia, Walsin Technology (Walsin) offers 26 part numbers at 10 milliohm in 1206 alone, 20 of them metal plate at 50 to 70 ppm and 10 automotive-labelled. Venatech, Walsin’s authorised distributor in Hong Kong, crosses your shunt to them free and quotes small lots for Surabaya pilot builds.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a battery management system (BMS) engineer or buyer in Surabaya or elsewhere in East Java who is choosing the shunt that measures pack current. We parsed every low-ohm current sense family in the Walsin chip resistor export files in our data folder, read the Resistance, Size, Rated Power, TCR and Tolerance columns, and checked our stock list as at 23 September 2026. We re-measured every figure on 11 November 2026. The market statement below names its source and the date we fetched it.
What did Listrik Indonesia report about EV batteries in Surabaya?
A Chinese battery maker opened a production base there. According to Listrik Indonesia on 29 June 2026, Tianneng Group inaugurated factory operations on 25 June 2026 in the Surabaya and Sidoarjo border area of East Java, making lead-acid batteries and IP67-rated lithium batteries, with solid-state batteries still in development.
The report quotes Tianneng’s international business president as saying the company chose East Java because most of its customers are on Java, logistics are more efficient and most of its industrial partners already operate around Surabaya. It also lists cooperation agreements with PT Tri Mega Baterindo, Goda, U-Winfly, GreenTech and Aima. The article gives no capacity, investment or jobs figure, so we give none. Our conclusion is simple: battery packs assembled near Surabaya need a BMS, and every BMS measures current through a shunt. We have no relationship with Tianneng and say nothing about what it buys.
What does a current sense resistor do in a battery pack?
It turns pack current into a small voltage the BMS can read. At 10 milliohm, a 10 A load produces 100 mV across the shunt and dissipates 1 W, which is why the shunt on a two-wheeler or e-bike pack is a low-ohm power part even in a 1206 body.
That arithmetic (V = I x R, P = I squared x R) drives three choices: the resistance sets the signal and the loss, the power rating must cover the continuous current with margin, and the temperature coefficient (TCR) decides how far the reading drifts as the shunt heats. Metal plate and metal foil constructions reach lower resistance and lower TCR than thick film. Our guide to low-ohm current sense, thick film against metal explains the trade-off.
How many Walsin current sense resistors are there?
11,760 part numbers. We counted 11,760 distinct Walsin low-ohm current sense part numbers across 11 series, 1,188 of them in metal plate or metal foil construction, and 672 are 10 milliohm or lower.
The families split into thick film low-ohm, thick film power low-ohm (including a reverse-geometry type), wide terminal power low-ohm, metal plate, metal plate power and metal foil. For a Surabaya battery maker that means one supplier covers both the cost-sensitive thick film position on a small charger and the metal-element position on the main pack shunt. The chip resistor range lists them.
Which Walsin 10 milliohm 1206 shunts cross an automotive-labelled 1 W brief?
Three do, and the TCR split is the real story. We filtered the current sense rows to 10 milliohm in 1206 and found 26 part numbers: 20 metal plate parts at 50 to 70 ppm and 6 thick film parts at 1,000 to 2,100 ppm; 10 are automotive-labelled, and 3 are automotive-labelled, 1 percent and rated 1 W, the brief we set for an electric two-wheeler pack.
Your incumbent goes in the last column.
| Walsin part | Family as the export names it | Tolerance | Rated power | TCR (ppm/K) | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|---|
WW12NR010FTLJ |
Metal Plate Low Ohm (Automotive) | 1% | 1 W | 50 | Match, lowest TCR in the set | |
WW12KR010FTLJ |
Metal Plate Low Ohm (Automotive) | 1% | 1 W | 70 | Match | |
WW12RR010FTLV |
Metal Plate Power Low Ohm (Automotive) | 1% | 1 W | 70 | Match | |
WW12MR010FTLJ |
Metal Plate Low Ohm (Automotive) | 1% | 1/2 W | 50 | Mismatch: power below the brief | |
WW12JR010FTLJ |
Metal Plate Low Ohm (Automotive) | 1% | 1/2 W | 70 | Mismatch: power below the brief | |
WW12NR010FTL |
Metal Plate Low Ohm | 1% | 1 W | 50 | Mismatch: not automotive-labelled | |
WW12WR010FTL |
Thick Film Low Ohm | 1% | 1/3 W | 1,000 | Mismatch: thick film, power and TCR outside the brief | |
WW12XR010FTL |
Thick Film Low Ohm | 1% | 1/4 W | 2,100 | Mismatch: thick film, power and TCR outside the brief |
The TCR gap matters inside a warm pack: across a 50 K rise, 50 ppm/K moves the reading by 0.25 percent, while 2,100 ppm/K moves it by about 10 percent. A match is a match on export fields, no more. Automotive-labelled is the export’s series label; ask for Walsin’s own qualification documents before you treat any part as AEC-Q200 for your programme, and read our note on what AEC-Q200 actually certifies.
What should a Surabaya BMS engineer check beyond the export?
Three things the export does not carry. Of the five columns we used for the 26-part filter, none gives the pad layout, the four-terminal (Kelvin) option or the pulse rating, so take those from Walsin’s own datasheet for the exact part number.
Kelvin sensing matters at 10 milliohm, because the solder joint can add resistance of the same order as the shunt. Pulse rating matters for motor start and regenerative braking on an electric two-wheeler. And the derating curve decides how much of the 1 W you can use inside a sealed IP67 pack. We hold Walsin’s MR automotive thick film datasheet, Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf, and request metal plate datasheets from Walsin on your behalf.
What does Venatech hold in Hong Kong for current sense?
Three thick film current sense lines. Of the 1,125 distinct part numbers on our stock list as at 23 September 2026, 3 are Walsin current sense resistors: WW08WR270FTL, WW08WR390FTL and WW08WR470FTL, all 0805 thick film at 1/4 W.
Those suit charger and auxiliary sensing positions. For the 10 milliohm metal plate parts, request a quote and we source them through our authorised Walsin channel. The ready-stock list is a dated snapshot, never live-synced, and we give no lead time or stock promise.
How Venatech helps: what should an Indonesian battery team send us?
Your shunt part numbers and the current they carry. Venatech is Walsin’s authorised distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, field by field, with every difference stated.
Paste up to 500 part numbers into the free cross-reference tool and filter for automotive grade, or upload a BOM and request a quote. The ready-stock list is a Hong Kong snapshot dated 23 September 2026. Worked example from our own export: a 10 milliohm, 1206, 1 percent, 1 W, automotive-labelled brief returned 3 matches across 2 metal plate families. We hold no office in Indonesia and give no customs advice; confirm import rules with your compliance team. Walsin is our authorised line; Stackpole and Viking are lines we supply.
The short version
For a battery pack built in Surabaya, Indonesia, Walsin covers the current sense resistor position in depth: 11,760 current sense part numbers, and 26 at 10 milliohm in 1206 alone, 20 of them metal plate at 50 to 70 ppm. Venatech, Walsin’s authorised distributor in Hong Kong, crosses your shunt and quotes small lots.
Send us your shunt lines with resistance, power and grade, and we will return the Walsin crosses with every difference stated. What continuous current does your main pack shunt carry?
Related reading
- Low-ohm current sense: thick film against metal
- Passives for a battery management system
- What AEC-Q200 actually certifies
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Listrik Indonesia, “Produsen baterai EV China pilih Surabaya sebagai basis produksi”, 29 June 2026: https://listrikindonesia.com/detail/20488/produsen-baterai-ev-china-pilih-surabaya-sebagai-basis-produksi
Frequently asked questions
Which battery maker opened production in Surabaya, Indonesia?
Listrik Indonesia reported on 29 June 2026 that Tianneng Group inaugurated factory operations on 25 June 2026 in the Surabaya and Sidoarjo border area, making lead-acid and IP67-rated lithium batteries. The article gives no capacity figure.
Which Walsin 10 milliohm 1206 current sense resistors are automotive-labelled?
We counted 10 of the 26 Walsin 10 milliohm 1206 parts as automotive-labelled. At 1 percent and 1 W, three match: WW12NR010FTLJ, WW12KR010FTLJ and WW12RR010FTLV.
How much power does a 10 milliohm shunt dissipate?
Power is current squared times resistance, so at 10 A a 10 milliohm shunt dissipates 1 W and produces 100 mV. Choose a power rating with margin and check the derating curve in Walsin’s datasheet.
Are Walsin automotive-labelled shunts AEC-Q200 qualified?
The export labels series as automotive. Ask for Walsin’s qualification documents for the exact part number before treating it as AEC-Q200 for your programme; compliant is not certified.
Does Venatech stock current sense resistors in Hong Kong?
As at 23 September 2026 our snapshot holds three Walsin thick film current sense lines in 0805. For metal plate 1206 shunts, request a quote and we source them through our authorised Walsin channel.
Is Venatech an authorised Walsin distributor?
Yes. Venatech Limited is Walsin’s authorised distributor in Hong Kong, serving Indonesia from Hong Kong with small lots and fast quotes.