For a UK power supply that needs a surge-withstanding chip resistor, none of the 8,340 parts in the Walsin Technology (Walsin) Anti-Surge series is tighter than plus or minus 5 percent. The plus or minus 1 percent surge parts, 6,165 of them, sit in two other series: Triple Power Surge and Power Surge, both labelled automotive.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a design or sourcing engineer at a UK maker of power supplies or power electronics who is choosing a resistor that must survive pulses. It uses the Walsin chip resistor export, re-measured on 10 November 2026 (234,815 rows, 234,401 distinct part numbers), and our stock list dated 23 September 2026. Every part number is real and every count is ours.
What did the UK government report about the grid demand queue in March 2026?
It reported a very large jump in demand waiting to connect. The Department for Energy Security and Net Zero said on 11 March 2026 that the queue for demand connections to the transmission network grew 460 percent in the six months to June 2025, driven largely by speculative applications, with some projects facing waits of up to 15 years.
That is the government’s statement, fetched 10 November 2026, and it names no sector or figure in gigawatts. A separate UK compute roadmap, reported by RCR Wireless on 22 July 2025, set a target of at least 6 GW of AI-capable data centre capacity by 2030. We make no claim about which loads join the queue or what any supplier buys. The engineering point is narrower: power supplies sit between the grid and every such load, and the resistor beside the input stage sees line transients.
How tight is the tolerance on Walsin anti-surge chip resistors?
Not tighter than plus or minus 5 percent. We counted all 8,340 part numbers in the Walsin Thick Film Anti-Surge series: 2,780 are plus or minus 5 percent, 2,780 are plus or minus 10 percent and 2,780 are plus or minus 20 percent; zero are plus or minus 1 percent.
The series runs from 0603 to 2512, from 0.27 ohm to 22 megohm, with 100 or 200 ppm. We have not seen this counted anywhere. Our post on anti-surge chip resistors explains the construction. A designer who carries a plus or minus 1 percent value in a surge position, for a divider or a bleeder, will not find it in this series.
Where do plus or minus 1 percent surge parts exist in the Walsin export?
In two automotive-labelled series. We parsed the three surge series (17,180 part numbers) and found 6,165 at plus or minus 1 percent: 4,795 in Thick Film Triple Power Surge (Automotive), from 0402 to 2512 and 1 ohm to 1 megohm, and 1,370 in Thick Film Power Surge (Automotive), 0603 and 0805 only.
The Power Surge series also holds the only plus or minus 0.5 percent surge parts, 1,370 of them. Rated power differs from the anti-surge series at the same size: at 1206 the Triple Power Surge parts publish 3/4 W against 1/4 W or 1/3 W, and at 2512 they publish 2 W against 1 W. The series name carries the automotive label, so confirm what your application needs with Walsin documentation, since we hold no datasheet for these series and make no AEC-Q200 claim.
| Surge series | Part numbers | Tolerances published | Sizes | Match / mismatch against a 1 percent need |
|---|---|---|---|---|
| Thick Film Anti-Surge | 8,340 | 5, 10, 20 percent | 0603 to 2512 | Mismatch: no plus or minus 1 percent |
| Thick Film Triple Power Surge (Automotive) | 5,810 | 1 percent on 4,795; 5 percent on 1,015 | 0402 to 2512 | Match on tolerance |
| Thick Film Power Surge (Automotive) | 3,030 | 0.5 percent 1,370; 1 percent 1,370; 5 percent 290 | 0603, 0805 | Match on tolerance, only two sizes |
Which Walsin parts cross a 10 kilohm, 1206, 1 percent surge brief?
Exactly one. At 10 kilohm in 1206 we found 9 anti-surge part numbers (three tolerances, three variants) and none at plus or minus 1 percent; the only surge match is MF12E1002FTL in the Triple Power Surge series, 3/4 W and 100 ppm.
| Walsin part | Description | On shelf 23 Sep 2026 | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|
MF12E1002FTL |
Triple Power Surge (Automotive), 1206, 10 kilohm, plus or minus 1 percent, 100 ppm, 3/4 W | No | Match on size, value and tolerance; series is labelled automotive | |
MF12E103 JTL |
Triple Power Surge (Automotive), 1206, 10 kilohm, plus or minus 5 percent, 200 ppm, 3/4 W | No | Mismatch: tolerance and TCR | |
WK12S103 JTL |
Anti-Surge, 1206, 10 kilohm, plus or minus 5 percent, 100 ppm, 1/3 W | No | Mismatch: tolerance is five times wider; power 1/3 W | |
WF12S103 KTL |
Anti-Surge, 1206, 10 kilohm, plus or minus 10 percent, 100 ppm, 1/4 W | No | Mismatch: tolerance 10 percent |
Note the embedded space in MF12E103 JTL and WK12S103 JTL: it is part of the part number string, and it will not paste cleanly into a BOM. Our chip resistor power rating by case size post explains why 1206 ratings differ by series. A match is a match on export fields only, and surge capability needs the datasheet.
What is on the Hong Kong shelf?
Four surge parts, all one series. Of the 17,180 surge part numbers we parsed, 4 are on our stock list dated 23 September 2026: MF12E1R00FTL, MF12E2200FTL, MF12E3300FTL and MF12E3902FTL, all 1206, plus or minus 1 percent; 0 of the 8,340 anti-surge parts is stocked.
The list holds 1,125 distinct codes, 254 of them chip resistors. It is a snapshot, never live. The values are 1 ohm, 220 ohm, 330 ohm and 39 kilohm; 10 kilohm is not among them. The Walsin chip resistor range lists the families, and a to-order enquiry goes through the site with no promise on timing.
What do we hold on Stackpole for surge and pulse resistors?
No Stackpole data. Stackpole is a line Venatech supplies; Walsin is the only line we are authorised for. We tried stackpole.com on 10 November 2026 and every requested page redirected to the johnsonelectric.com homepage, which held no product data, so this post cites no Stackpole specification.
We hold no Stackpole export or datasheet. Send your incumbent’s part number and datasheet and we will read it against the Walsin fields, stating each difference. A pulse rating depends on pulse shape and test method, and we state none for any line. Confirm against both datasheets and qualify in your own circuit.
How can Venatech help a UK power-supply designer?
How Venatech helps starts with the free cross-reference tool (VenaMatch): it decodes 18 manufacturers’ part numbers across 800,000+ crossable parts, takes up to 500 part numbers or an Excel or CSV file, and marks each field match or mismatch. Paste a power-supply BOM to check every resistor line. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.
We serve from Hong Kong in small lots, and you request a quote through the site. We hold no office or stock in the UK. We give no legal, customs or conformity advice, so confirm with your compliance team.
The short version
For a UK power supply, tolerance decides which surge series you can use: none of 8,340 anti-surge parts is tighter than plus or minus 5 percent, 6,165 surge parts reach plus or minus 1 percent in two automotive-labelled series, and 4 surge parts are on the shelf. Check tolerance, power and series label together.
Send us one surge-position resistor from your power-supply BOM with the value, tolerance and size, and we will return the Walsin parts with every difference stated. If your incumbent is plus or minus 1 percent in a surge position, do you know which series label you can accept?
Related reading
- Anti-surge chip resistors
- Chip resistor power rating by case size
- Thin film against thick film chip resistors
- Free cross-reference tool and the dated ready-stock list
Last reviewed 10 Nov 2026.
Sources
Fetched 10 November 2026.
- GOV.UK, Government to tackle speculative demand grid connection requests, 11 March 2026: https://www.gov.uk/government/news/government-to-tackle-speculative-demand-grid-connection-requests
- RCR Wireless, UK sets 6 GW target for AI-capable DC capacity by 2030, 22 July 2025: https://www.rcrwireless.com/?p=421903
- Venatech Walsin chip resistor export, re-measured 10 November 2026; Venatech stock list, as at 23 September 2026.
Frequently asked questions
What did the UK government say about the grid demand queue in March 2026?
The Department for Energy Security and Net Zero said on 11 March 2026 that the demand connection queue grew 460 percent in the six months to June 2025, driven largely by speculative applications, with waits of up to 15 years for some projects.
What is the tightest tolerance in Walsin anti-surge chip resistors?
Plus or minus 5 percent. Of 8,340 part numbers, 2,780 are 5 percent, 2,780 are 10 percent and 2,780 are 20 percent. None is plus or minus 1 percent.
Does Walsin make a plus or minus 1 percent surge chip resistor?
Yes, in the export: 6,165 part numbers in the Triple Power Surge and Power Surge series, both labelled automotive. Confirm the datasheet and qualification status for your exact part number.
Is MF12E1002FTL a drop-in match for a 10 kilohm, 1206, 1 percent surge resistor?
It matches size, value and tolerance, with 3/4 W and 100 ppm. Its series is labelled automotive and we hold no datasheet for it. Check surge data and qualify in your own circuit.
Does Venatech hold Stackpole surge or pulse resistor data?
No. Stackpole is a line we supply and Walsin is the only line we are authorised for. We hold no Stackpole export or datasheet, and stackpole.com redirected to the johnsonelectric.com homepage on 10 November 2026.
Which surge resistors are on the Hong Kong shelf?
As at 23 September 2026, four 1206 plus or minus 1 percent parts: 1 ohm, 220 ohm, 330 ohm and 39 kilohm. None of the 8,340 anti-surge parts is stocked. The snapshot is dated, not live.