SQ vertical double wire winding coils common mode choke coils Power supply EMC filtering.

 

             SQ (Square Core) is a square closed magnetic core. It mainly features flat wire common mode choke coils (CMC). Main models: SQ1010, SQ1212, SQ1515, SQ1918, SQ2418. It is available in both vertical and horizontal styles, in DIP package, and a few surface mount versions. It is specifically designed for power EMI common mode filtering, replacing traditional UU and ring-shaped common mode inductors.

 

Product parameters

Rated current	3A	Package Form	Through‑hole Inductor
Magnetic conductor properties	Ferrite core	Inductance	10mH
Kind	Common‑mode inductor	Winding form	Single‑layer close‑wound type
Application Fields	Household appliances	Brand	CXWON
Specifications	SQ1515	Installation Method	Vertical non‑sealed type
Core shape	E‑shaped	Inductive reactance XL	10（Ω）

 

 

Common models

Core advantages of SQ inductor

1.Closed‑square ferrite core, ultra‑low flux leakage, outstanding common‑mode EMI attenuation, reduce EMC debugging workload.

2.Flat copper winding design, low DCR, mitigate high‑frequency skin‑effect, high current‑handling capacity and low temperature rise.

3.Vertical & Horizontal dual package options, satisfy compact or low‑profile PCB layout requirements for slim power supplies.

4.Fully‑automatic winding process, tight parameter tolerance, excellent consistency for mass‑volume production.

5.UL94‑V0 flame‑retardant, AC1500‑2500V hipot rating, RoHS & REACH compliant.

6.Compact footprint, direct pin‑to‑pin replacement for UU and toroidal common‑mode chokes, custom specifications supported.

 

 

Flowchart

Why choose us

Q: What is SQ1515 common‑mode choke used for? 
A: SQ1515 flat‑wire common‑mode choke is applied for common‑mode EMI filtering at AC input of 65‑130W SMPS, widely used in PD adapters, LED drivers, industrial power supplies, energy‑storage auxiliary power and IoT devices.

Q: What is the difference between SQ1515‑V and SQ1515‑H?
A: V for vertical type, smaller PCB footprint with higher body height. H for horizontal type, low‑profile height for slim power supply. They share same electrical parameters, select according to mechanical constraints.

Q: SQ1515 can work as power inductor?
A: No. SQ series adopts closed square core without air‑gap, it is only designed for common‑mode noise filtering, not for energy‑storage power inductor. Suggest to use together with X‑capacitor and differential‑mode inductor for better EMC performance.

Q: What's the max rated current of SQ1515?
A: Standard rated current range 1.8‑4.5A. Higher inductance brings higher DCR and lower rated current. Custom flat‑wire specification is available to balance inductance and current capacity.

Q: Can SQ1515 replace UU‑type common mode choke?
A: Yes, direct pin‑to‑pin replacement for UU common‑mode choke. Closed‑loop core brings much lower flux leakage, better common‑mode noise suppression and lower DCR with improved temperature‑rise performance.