A power inductor sets the ripple and the efficiency of every DC-DC stage in a cobot joint, and Walsin Technology (Walsin) lists 403 power inductors in 16 series, 222 of them rated 3 A or more; a 4.7 uH, 20 percent, 3 A brief returns 13. Venatech is Walsin’s authorised distributor in Hong Kong.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for a motor-drive or power-supply engineer, or a buyer, in Toyohashi or elsewhere in Aichi, Japan, choosing the buck-converter inductors that feed a joint controller, encoder and gate drivers from a 24 V or 48 V robot bus. We parsed Walsin’s inductor export, Walsin_Inductor_ALL.xlsx (5,410 real parts after one test row), and our stock list as at 23 September 2026. Every part number is real. The hook is from June 2025 and we date it plainly.
What did JETRO report about collaborative robot production in Toyohashi?
A new cobot assembly site in Aichi. JETRO reported on 2 June 2025 that JAKA Robotics Japan, a subsidiary of Shanghai-based JAKA Robotics, set up a robot assembly and inspection plant with a showroom in Toyohashi City, Aichi Prefecture, in April 2025, and that its cobots are used in more than ten key automobile manufacturing processes.
The report gives no capacity or headcount, and it is from 2025; we fetched it again on 11 November 2026 and use it as a dated signal that cobot assembly is taking root next to Aichi’s car plants. The figures are JETRO’s, not ours, and we say nothing about what JAKA buys. For the engineers who design and service robot electronics in the region, the relevant part is inside each joint: a motor drive and its auxiliary DC-DC rails, each built around a power inductor.
How many Walsin power inductors are there, and how much current do they carry?
403 in 16 series. We counted every Walsin inductor in the export specified in microhenries, leaving aside the WLF filter families: 403 power inductors in 16 series, from 0.1 uH to 220 uH, with 359 rated 1 A or more and 222 rated 3 A or more.
| Walsin series group | Footprints in the export (mm) | Part numbers rated 3 A or more |
|---|---|---|
| AIP | 4.4 x 4.2 to 7.2 x 6.5 | 60 |
| CSME and CSMEA | 4.0 x 4.0 to 6.0 x 5.9 | 55 |
| VEFL | 5.7 x 5.4 and 7.1 x 6.5 | 27 |
| WIP, WIP_A, WIP_S, WIP_Y | 2.0 x 1.2 to 3.2 x 2.5 | 31 |
| WLPH, WLPH(HC), WQPH, WPA | 2.0 x 1.6 and 2.5 x 2.0 | 47 |
| MAP | 1.6 x 0.8 | 2 |
The large-body AIP, CSME and VEFL parts carry the current for a joint’s main buck stage; the 2.0 by 1.6 and 2.5 by 2.0 mm chip parts suit lighter rails. Our guide to Walsin power inductors above 1 A walks through the families, and the inductor range page lists them.
Which Walsin power inductors match a 4.7 uH, 20 percent, 3 A buck-converter brief?
Thirteen do. We filtered the 403 power inductors to 4.7 uH and a rated current of 3 A or more and found 16 part numbers in four series; 13 list a 20 percent tolerance and match the brief, and 3 list 30 percent.
| Walsin part | Series | Footprint (mm) | Height (mm) | Rated current | Saturation current | Match / mismatch with 4.7 uH, 20%, 3 A | Your incumbent |
|---|---|---|---|---|---|---|---|
AIP0518MB-4R7M |
AIP | 5.4 x 5.2 | 1.6 | 3.5 A | not listed | Match, low profile | |
AIP0615MB-4R7M |
AIP | 7.0 x 6.6 | 1.3 | 3.2 A | not listed | Match, lowest height | |
AIP0630MB-4R7M |
AIP | 7.0 x 6.6 | 2.8 | 6 A | not listed | Match | |
AIP0530GX-4R7MPB |
AIP | 5.7 x 5.4 | 3.0 | 5.9 A | not listed | Match | |
AIP0630GX-4R7MPB |
AIP | 7.2 x 6.5 | 3.0 | 7.1 A | not listed | Match, most current | |
CSME0540D-4R7M |
CSME | 5.0 x 5.0 | 4.0 | 3.1 A | 3.3 A | Match | |
CSME0645D-4R7M |
CSME | 6.0 x 5.9 | 4.5 | 3.7 A | 4 A | Match | |
CSMEA0540D-4R7M |
CSMEA | 5.0 x 5.0 | 4.0 | 3.1 A | 3.3 A | Match | |
VEFL2C0530-4R7MPA |
VEFL | 5.7 x 5.4 | 3.0 | 5.9 A | not listed | Match | |
CSME0540D-4R7N |
CSME | 5.0 x 5.0 | 4.0 | 3.1 A | 3.3 A | Mismatch: 30% tolerance |
The other matches are CSMEA0645D-4R7M and three more VEFL parts at 7 A to 7.1 A. Rated current is usually a temperature-rise limit and saturation current an inductance-drop limit; size the part for your peak ripple current against the lower of the two. Our explainer on rated current against saturation current shows why.
Which Walsin power inductor did Venatech hold in Hong Kong on 23 September 2026?
A 4.7 uH chip power inductor. Our stock list as at 23 September 2026 held WLPH252012M4R7PP, a Walsin WLPH 2520 chip inductor at 4.7 uH, 20 percent and 1.61 A, and WLPH252012M2R2PP at 2.2 uH and 2.27 A, both 2.5 by 2.0 mm and 1.2 mm high.
Neither carries the 3 A of the main joint brief, so treat them as a mismatch on current there. They do suit the lighter rails in a cobot joint, such as an encoder or sensor supply at a few hundred milliamps, and a bench prototype. The 13 matching parts are quoted to order: 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 stock or lead-time promise.
What should a Toyohashi robot engineer check beyond inductance and current?
Height, shielding and heat. In the 13 matching parts, height runs from 1.3 mm to 5.4 mm and rated current from 3 A to 7.1 A, so the joint’s enclosure depth and its airflow decide the pick as much as the electrical brief.
A cobot joint is a sealed, warm space next to a motor. A shielded construction, where the datasheet confirms one, keeps the inductor’s field off the encoder and current-sense traces nearby. A low-profile part such as the 1.3 mm AIP0615 fits under a stacked board, while a taller part runs cooler at the same current. Check the core-loss behaviour at your switching frequency on Walsin’s datasheet, then confirm against both datasheets and qualify in your own circuit. We hold no ISO 9001 or IATF 16949 certificate of our own and give no customs advice; confirm with your compliance team.
How Venatech helps: how can a Toyohashi robotics team cross its power inductors?
Paste or upload. VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, marking each field as a match or a mismatch, so a Toyohashi team can check its joint-drive inductors against Walsin’s 403 power inductors in one pass.
Use the cross-reference tool for a few parts or the BOM page for a whole drive board. Venatech is Walsin’s authorised distributor in Hong Kong; Stackpole and Viking are lines we supply. We serve small lots from Hong Kong and you request a quote through the site.
The short version
JAKA Robotics Japan opened a cobot assembly plant in Toyohashi in April 2025, per JETRO. For the DC-DC stages inside each robot joint, we counted 403 Walsin power inductors in 16 series, 222 rated 3 A or more; a 4.7 uH, 20 percent, 3 A brief returns 13, and a 4.7 uH WLPH chip inductor sat on our Hong Kong shelf.
Send us your joint-drive inductor lines with the ripple current and height limit, and we will return Walsin crosses with every field difference marked. Is your inductor sized against saturation current, or only against rated current?
Related reading
- Walsin power inductors above 1 A
- Rated current against saturation current in chip inductors
- Robotics passive components for a humanoid joint controller
- VenaMatch cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- JETRO, JAKA Robotics Japan sets up a plant in Toyohashi City, Aichi Prefecture, 2 June 2025 (older source, re-fetched 11 November 2026): https://www.jetro.go.jp/en/invest/newsroom/2025/6df8b8a5e8aee63e.html
- Walsin inductor parametric export, Walsin_Inductor_ALL.xlsx, and Venatech stock snapshot as at 23 September 2026, both re-measured by Venatech on 11 November 2026.
Frequently asked questions
How many power inductors does Walsin offer for robot makers in Toyohashi, Japan?
We counted 403 Walsin power inductors in 16 series, from 0.1 to 220 microhenry, with 222 rated 3 amperes or more. Venatech, Walsin’s authorised distributor in Hong Kong, quotes all of them.
Which Walsin power inductor matches 4.7 uH, 20 percent, 3 A?
Thirteen match, including AIP0518MB-4R7M, AIP0630GX-4R7MPB, CSME0540D-4R7M, CSMEA0540D-4R7M and VEFL2C0530-4R7MPA. Choose by height and current, then confirm against both datasheets and qualify in your own circuit.
What is the difference between rated current and saturation current?
Rated current is usually the current at which the inductor’s temperature rises by a set amount; saturation current is where its inductance falls by a set percentage. Size the part for your peak current against the lower of the two.
Did Venatech hold Walsin power inductors in Hong Kong stock?
Our snapshot dated 23 September 2026 held WLPH252012M4R7PP at 4.7 microhenry and 1.61 amperes and WLPH252012M2R2PP at 2.2 microhenry, both 2520 chip parts. Other parts are quoted to order; we give no stock or lead-time promise.
Which Walsin power inductor is the lowest profile at 4.7 uH and 3 A?
In our count, AIP0615MB-4R7M at 1.3 millimetres high and 3.2 amperes rated, on a 7.0 by 6.6 millimetre footprint. AIP0518MB-4R7M is 1.6 millimetres high on a smaller 5.4 by 5.2 footprint.
What did JETRO report about Toyohashi?
On 2 June 2025 JETRO reported that JAKA Robotics Japan set up a robot assembly and inspection plant with a showroom in Toyohashi City, Aichi Prefecture, in April 2025. The report gives no capacity figures.