For a power inductor on a Serbian robot joint driver, Walsin Technology (Walsin) lists 142 CSME and CSMEA molded power inductors from 0.24 µH to 220 µH, 66 of them saturating at 3 A or more. A 4.7 µH brief returns 10. Venatech Limited, an authorised Walsin distributor in Hong Kong, holds two WLPH lines too.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for power electronics engineers in Šabac and across Serbia who design the DC-DC stages that feed joint drivers, controllers and sensors in humanoid robots and robotic dogs, and for the EMS teams who build them. We parsed the Walsin inductor export Walsin_Inductor_ALL.xlsx (5,411 rows, 5,410 real parts after one test row) and our ready-stock list as at 23 September 2026. Every part number is real, and the market facts come from one government release fetched on 11 November 2026.
What is Minth building in Šabac?
Humanoid robot production. According to Serbia’s Development Agency (RAS) on 29 August 2026, Minth Group launched mass production of humanoid robots at its Šabac facility with AGIBOT, a first phase of 20 million euros within a planned 200 million euros including a robotics park in Inđija, aiming for up to 20,000 humanoid robots and robotic dogs a year.
The release says Minth employs more than 2,000 people in Šabac and that AGIBOT delivered 5,168 humanoid robots in 2025. Those are the agency’s figures, not ours. Our conclusion: each robot carries dozens of motor joints, and every joint driver and controller board needs a buck converter with an inductor that will not saturate when the motor stalls. We have no relationship with Minth or AGIBOT and say nothing about what they buy.
How many molded power inductors does Walsin list?
142 in the CSME and CSMEA families. We counted the CSME and CSMEA series in Walsin_Inductor_ALL.xlsx: 142 distinct molded power inductors in 4040, 5050 and 6060 footprints (42, 47 and 53 parts), from 0.24 µH to 220 µH, and 66 list a saturation current of 3 A or more, up to 14 A.
These are the Walsin rows that publish saturation current, the figure a motor-drive designer needs first. Beyond them, the range adds thin-film power families such as WLPH (41 parts) for space-limited boards. Our explainer on rated current versus saturation current sets out the two limits, and the inductor range lists every series.
Which Walsin 4.7 µH power inductors cross a joint-driver brief?
Ten molded parts, plus two MIP-H chip parts. We filtered the inductor export to 4.7 µH rows that publish saturation current and found 12: 10 CSME, CSMM and CSMEA molded parts in 4040, 5050 and 6060 with saturation currents of 2 A to 4 A, and 2 small MIP-H chip parts below 0.3 A.
The table takes a typical joint-driver buck brief, 4.7 µH, at least 3.5 A saturation, at least 3 A rated, and shows the closest rows. Your incumbent goes in the last column.
| Walsin part | Footprint | Tolerance | Rated current | Saturation current | Match / mismatch with the brief | Your incumbent |
|---|---|---|---|---|---|---|
CSME0645D-4R7M |
6060 | ±20% | 3.7 A | 4 A | Match on every field | |
CSME0645D-4R7N |
6060 | ±30% | 3.7 A | 4 A | Match, wider tolerance | |
CSMEA0645D-4R7M |
6060 | ±20% | 3 A | 4 A | Match | |
CSMM0420D-4R7M |
4040 | ±20% | 2.85 A | 4 A | Mismatch: rated current below 3 A, smaller footprint | |
CSME0540D-4R7M |
5050 | ±20% | 3.1 A | 3.3 A | Mismatch: saturation below 3.5 A | |
CSME0418D-4R7M |
4040 | ±30% | 1.7 A | 2 A | Mismatch: too low for this brief |
A match is a match on export fields. Take DC resistance, the saturation definition (the percentage inductance drop) and the temperature-rise curve from Walsin’s datasheet, and check the footprint before any swap.
Why does saturation current decide a robot joint’s power inductor?
Because a stalled motor pulls peak current, and a saturated inductor stops limiting it. In a 4.7 µH buck, a ripple of about 30% at 3 A output puts the inductor’s peak near 3.5 A; if the part saturates at 3.3 A, inductance collapses at the moment the joint is under most load.
That is why the brief above asks for 3.5 A saturation, not just 3 A rated. Humanoid joints see repeated stall and start events, so the margin matters more than on a steady supply. Our guide to passives for a BLDC motor drive shows the rest of the stage. We give no functional-safety or machinery-directive advice; confirm with your compliance team.
Which Walsin power inductors are on the Hong Kong shelf?
Two WLPH lines. We matched the inductor export against our ready-stock list as at 23 September 2026 and found two Walsin WLPH thin-film power inductors on the shelf: WLPH252012M4R7PP (4.7 µH, 1.61 A) and WLPH252012M2R2PP (2.2 µH, 2.27 A), both 2.5 by 2.0 by 1.2 mm.
| Walsin part on the shelf | Inductance | Tolerance | Rated current | Size (mm) |
|---|---|---|---|---|
WLPH252012M4R7PP |
4.7 µH | ±20% | 1.61 A | 2.5 × 2.0 × 1.2 |
WLPH252012M2R2PP |
2.2 µH | ±20% | 2.27 A | 2.5 × 2.0 × 1.2 |
Those suit sensor, controller and communication rails on a robot’s compact boards, where 6 mm molded parts will not fit. The CSME and CSMEA parts above 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; we give no stock or lead-time promise.
How can Venatech help a robotics electronics maker in Serbia?
How Venatech helps: cross the inductor lines, then quote. Venatech Limited is the authorised Walsin distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, marking each field match or mismatch.
Paste up to 500 part numbers into the cross-reference tool, or upload a BOM. We serve small lots from Hong Kong, quote fast and help with each cross; request a quote through the site. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply. We give no customs advice.
The short version
Šabac is building humanoid robots, and every joint driver needs a power inductor that will not saturate under stall. Walsin covers that with 142 CSME and CSMEA molded power inductors, 66 of them saturating at 3 A or more; a 4.7 µH brief returns 10 molded parts, three of which meet a 3.5 A saturation brief. Two WLPH lines were on our Hong Kong shelf as at 23 September 2026.
Send us your converter’s inductance, output current and ripple target, and we will return the Walsin rows with the saturation margin worked out. What peak current does your joint driver see at stall?
Related reading
- Rated current versus saturation current in chip inductors
- Walsin power inductors above 1 A
- Passives for a BLDC motor drive
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Development Agency of Serbia (RAS), “Minth Group Launches Europe’s First Mass Production of Humanoid Robots”, 29 August 2026: https://ras.gov.rs/minth-group-launches-europes-first-mass-production-of-humanoid-robots
Frequently asked questions
What is Minth producing in Šabac, Serbia?
Serbia’s Development Agency reported on 29 August 2026 that Minth Group launched humanoid robot mass production in Šabac with AGIBOT, aiming for up to 20,000 humanoid robots and robotic dogs a year. These are the agency’s figures.
How many Walsin molded power inductors are there?
We counted 142 distinct CSME and CSMEA molded power inductors in 4040, 5050 and 6060, from 0.24 µH to 220 µH; 66 saturate at 3 A or more.
Which Walsin 4.7 µH inductor has 4 A saturation current?
CSME0645D-4R7M, CSME0645D-4R7N, CSMEA0645D-4R7M and CSMM0420D-4R7M list 4 A saturation. Check rated current, DC resistance and footprint against Walsin’s datasheet.
What is the difference between rated current and saturation current?
Rated current is set by temperature rise; saturation current is where inductance drops by a stated percentage. A motor-drive buck should keep its peak current below the saturation figure.
Does Venatech stock Walsin power inductors in Hong Kong?
As at 23 September 2026 our snapshot held WLPH252012M4R7PP and WLPH252012M2R2PP. CSME and CSMEA parts are quoted to order through our authorised Walsin channel; we make no lead-time promise.
Can Venatech supply robotics makers in Serbia?
Yes. Venatech Limited is an authorised Walsin distributor in Hong Kong, serving buyers in Serbia in small lots. We give no customs advice; confirm with your compliance team.