For the anti-surge resistor in a power supply built in the Philippines, Walsin Technology (Walsin) lists 9 surge-rated parts at 10 ohm and 1 percent alone, from 1/5 W in 0402 to 2 W in 2512, and 4 fit 1206 or smaller at 1/3 W or more. Venatech, Walsin’s authorised distributor in Hong Kong, crosses your incumbent free.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a power supply or NPI engineer at an EMS plant in Laguna who is placing resistors that must survive a pulse: inrush limiters, snubber resistors, gate resistors and bleeders across the input of a server or industrial power supply. We parsed the Walsin chip resistor export files in our data folder, kept the three anti-surge series (from Thick_Film_Anti_Surge_Chip_Resistor_1.xlsx to Thick_Film_Anti_Surge_Chip_Resistor_Jumper.xlsx), and checked our stock list as at 23 September 2026. We re-measured every figure on 11 November 2026.
What did Context.ph report about EMS Group in Laguna?
A capacity push driven by AI demand. According to Context.ph on 25 May 2026, Philippine electronics maker EMS Group expects to double its capacity by September 2026, with AI-related products making up about 15 to 17 percent of its EMS business and possibly as much as 25 percent.
The report says the company began scaling up in the fourth quarter of 2025, makes power supply components and circuit boards that clients integrate into larger platforms, serves international clients particularly in the US, and is upgrading and reconfiguring existing plants in Laguna rather than building a large new factory. It also quotes the company’s president warning of intense regional competition. Those are Context.ph’s figures, not ours. Our reading: more power supply boards are being built in Laguna, and power supply boards are where surge-rated resistors earn their place. We have no relationship with EMS Group and say nothing about what it buys.
Where does a power supply need an anti-surge resistor?
Wherever a resistor sees a pulse larger than its steady rating. A standard thick film chip resistor is rated for continuous power, while an anti-surge part is built to survive short pulses many times that power, which matters in inrush limiting, RC snubbers, gate drive and bleeder positions; Walsin offers 17,180 such part numbers.
At switch-on, a power supply’s bulk capacitor draws a large inrush current, and a resistor in that path takes a pulse far above its continuous rating. RC snubbers across switches take repeated pulses every cycle. Bleeder resistors across high-voltage capacitors see the full voltage at turn-off. A general purpose part in any of these positions can drift or open early. Our guide to anti-surge chip resistors explains how the construction differs.
How many Walsin anti-surge resistors are there?
17,180. We counted 17,180 distinct Walsin part numbers in three surge series: 8,340 Thick Film Anti-Surge, 5,810 Triple Power Surge (Automotive) and 3,030 Power Surge (Automotive), in seven sizes from 0402 to 2512.
Power ratings run from 1/10 W in 0603 to 2 W in 2512. The plain anti-surge series is offered at 5, 10 and 20 percent tolerance, 2,780 parts at each; the two automotive-labelled surge series add 1 percent parts and higher ratings per size, such as 3/4 W in 1206 and 1/2 W in 0805. For a Laguna EMS, that means the surge position can usually stay in the footprint the customer already uses. The chip resistor range lists the families.
Which Walsin 10 ohm surge resistors cross a 1206-or-smaller brief?
Four match. We filtered the surge series to 10 ohm at 1 percent and found 9 part numbers in 7 sizes, from 1/5 W in 0402 to 2 W in 2512; 4 are rated 1/3 W or more in 1206 or smaller, the brief we set for an inrush or snubber position on a compact board.
Your incumbent goes in the last column.
| Walsin part | Family as the export names it | Size | Rated power | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|
MF12E10R0FTL |
Triple Power Surge (Automotive) | 1206 | 3/4 W | Match, highest power in the brief | |
MF08E10R0FTL |
Triple Power Surge (Automotive) | 0805 | 1/2 W | Match | |
MF06E10R0FTL |
Triple Power Surge (Automotive) | 0603 | 1/3 W | Match, smallest body in the brief | |
MK08S10R0FTL |
Power Surge (Automotive) | 0805 | 1/3 W | Match | |
MK06S10R0FTL |
Power Surge (Automotive) | 0603 | 1/4 W | Mismatch: power below the brief | |
MF04E10R0FTL |
Triple Power Surge (Automotive) | 0402 | 1/5 W | Mismatch: power below the brief | |
MF10E10R0FTL |
Triple Power Surge (Automotive) | 1210 | 3/4 W | Mismatch: body larger than 1206 | |
MF25E10R0FTL |
Triple Power Surge (Automotive) | 2512 | 2 W | Mismatch: body larger than 1206 |
All nine carry a TCR of 100 ppm in the export. Rated power is a continuous figure; the pulse the part survives comes from the pulse-withstand curve in Walsin’s own datasheet, which we request from Walsin for the part you shortlist. We hold Walsin’s MR automotive and WR general purpose datasheets, Walsin_MR_Automotive_Thick_Film_Chip_Resistor.pdf and Walsin_WR_General_Purpose_Chip_Resistor.pdf, for comparison.
What does Venatech hold in Hong Kong in surge resistors?
Four Triple Power Surge lines in 1206. Of the 1,125 distinct part numbers on our stock list as at 23 September 2026, 4 are Walsin surge-rated resistors: MF12E1R00FTL (1 ohm), MF12E2200FTL (220 ohm), MF12E3300FTL (330 ohm) and MF12E3902FTL (39 kilohm), all 1206 at 3/4 W.
They are the same family as MF12E10R0FTL in the table, so a Laguna NPI team can trial the construction from the shelf while the production value is quoted. For the 10 ohm parts, request a quote and we source them through our authorised Walsin channel. The ready-stock list is a dated snapshot, never live-synced; we give no lead time or stock promise.
What will we not tell you about your customers’ power supplies?
Whether a cross is approved, or what pulse your circuit really sees. Our counts cover catalogue coverage only: 17,180 surge-rated parts, 9 at 10 ohm and 1 percent, 4 inside a compact brief; none of it is a pulse calculation or a customer approval.
Measure the inrush pulse on your own board and compare it with Walsin’s pulse curve, and keep your customer’s approved vendor list in charge. We hold no office or entity in the Philippines; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We hold no ISO 9001 or IATF 16949 certificate and give no legal or customs advice; confirm with your compliance team.
How Venatech helps: what should a Laguna EMS team send us?
Your pulse-position resistor lines. Venatech is Walsin’s authorised distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, with every difference from your original stated.
Paste up to 500 part numbers into the free cross-reference tool, or upload a BOM and request a quote; mark which lines are inrush, snubber or bleeder positions and we return surge-rated candidates for them. Worked example from our own export: a 10 ohm, 1 percent, 1206-or-smaller, 1/3 W brief returned 4 matches in 2 families. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply. Small lots and fast quotes from Hong Kong.
The short version
For power supply boards built in Laguna, the Philippines, Walsin covers the anti-surge resistor position with 17,180 surge-rated part numbers, and 9 at 10 ohm and 1 percent alone. Venatech, Walsin’s authorised distributor in Hong Kong, holds 4 Triple Power Surge lines on its 23 September 2026 snapshot and crosses the rest.
Send us your inrush, snubber and bleeder resistor lines, and we will return the Walsin surge-rated crosses with every difference stated. Which resistor on your input stage takes the inrush?
Related reading
- Anti-surge chip resistors
- Chip resistor power rating by case size
- Walsin automotive chip resistors and the AEC-Q200 split
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Context.ph, “EMS Group ramps up for AI boom”, 25 May 2026: https://context.ph/2026/05/25/ems-group-ramps-up-for-ai-boom/
Frequently asked questions
What did Context.ph report about EMS Group in Laguna, the Philippines?
Context.ph reported on 25 May 2026 that EMS Group expects to double its capacity by September 2026, with AI-related products at about 15 to 17 percent of its EMS business, and that it is upgrading existing plants in Laguna. These are the publication’s figures.
How many Walsin anti-surge resistors are there?
We counted 17,180 distinct part numbers across Walsin’s Thick Film Anti-Surge, Triple Power Surge (Automotive) and Power Surge (Automotive) series, from 0402 to 2512 and 1/10 W to 2 W.
Which Walsin 10 ohm 1 percent surge resistors fit 1206 or smaller?
At 1/3 W or more, four match: MF12E10R0FTL (1206, 3/4 W), MF08E10R0FTL (0805, 1/2 W), MF06E10R0FTL (0603, 1/3 W) and MK08S10R0FTL (0805, 1/3 W). Check the pulse curve in Walsin’s datasheet.
Is a higher rated power enough to survive inrush?
Not on its own. Rated power is continuous; pulse survival depends on the pulse energy and duration, so compare your measured inrush with the pulse-withstand curve in the datasheet.
Does Venatech stock surge resistors in Hong Kong?
Yes. As at 23 September 2026 our snapshot holds four Walsin Triple Power Surge 1206 lines, MF12E1R00FTL, MF12E2200FTL, MF12E3300FTL and MF12E3902FTL. For other values, 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 and serves the Philippines from Hong Kong.