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Frame Core Chokes SQ2118 Horizontal Series

Frame Core Chokes SQ2118/2418/2820/2825 Horizontal

Smart Thermal Control and Wide Temperature Range Stability
Smart thermal control ensures that the SQ High Frequency Transformers maintain optimal performance across a wide operating temperature range of -40°C to +150°C, making them reliable in extreme conditions.
The inductance fluctuation is kept below 5%, ensuring stable operation in current transformers even in high or low-temperature industrial environments.

Low Loss and EMC Optimization
The high-frequency loss of the ferrite material used in the SQ series is below 200mW/cm³ at 100kHz, ensuring minimal energy loss and long-term performance in current transformers and high frequency transformers.
Integrated magnetic shielding and sandwich winding methods reduce radiation noise to less than 30dBμV/m (EN 55032 Class B), ensuring compliance with EMC standards and optimized operation in current transformers and high-frequency transformers.

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Model:
SQ2118/2418/2820/2825 Horizontal
Brand:
INF

Frame Core Chokes SQ2118/2418/2820/2825 Horizontal SQ Common Mode Choke SQ Common Mode Choke Coil SQ Common Mode Choke Inductor SQ Ferrite Core Common Mode Choke Square Core Common Mode Choke SQ EMI Filter Choke SQ EMI Suppression Choke

Product Description

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Applications

• Switching Mode Power Supplies (SMPS)
• LED Driver Power Supplies
• AC Power Line EMI Filters
• Industrial Power Equipment
• Home Appliance Power Systems
• Solar Inverters and Charging Equipment

Minimum Order Quantity (MOQ)

Prototype / Sample Orders:
Orders starting from 1 piece are accepted. Free sampling and customization services are available, with up to 5 free samples provided (shipping cost to be paid by the customer).

Bulk Orders:
Discounted pricing is available for orders of 5,000 pieces or more.

Parameter	Specification/Range
Inductance	1mH - 10mH (customizable with ±10% accuracy)
Operating Frequency	20kHz - 1MHz
Power Capacity	200W - 1.5kW (natural/forced cooling)
Insulation Withstand Voltage	Primary - secondary 4kV AC (1 minute)
Temperature Rise Limit	≤40°C (full load, natural cooling)
Package Form	DIP/SMD optional, automated pick-and-place

Model Comparison Table

Test Condition:1KHz/0.3V AT(25℃)

Specifications and Electrical Characteristics

SQ2118 Horizontal

INF Code	Inductance	Wire Diameter	Turns	DC Resistance	Applicable Enameled Wire Diameter	Operating Current	Applicable Power
SQ2118-7mH	7mH	0.3*1.5	37	80mΩ MAX	0.75	3.15～4.05A	150～360W
SQ2118-10mH	10mH	0.25*1.5	42	100mΩ MAX	0.57	2.62～3.75A	150～340W
SQ2118-10mH	10mH	0.25*1.2	45	100mΩ MAX	0.62	2.4～3.6A	150～320W
SQ2118-18mH	18mH	0.2*1.5	53	120mΩ MAX	0.62	2.4～3.6A	150～320W
SQ2118-20mH	20mH	0.18*1.0	58	180mΩ MAX	0.50	1.44～2.16A	150～200W

SQ2418 Horizontal

屏幕截图 2026-01-27 111643

SQ2820 Horizontal

SQ2825 Horizontal

Dimensions:[mm]

SQ2118,2418,2820,2825H_01(1)

SQ2118,2418,2820,2825H_02(1)

Customization & Procurement

Main Category	Subcategory	Details
MOQ	Prototyping & Small-batch	10 piece minimum order
	Sample Service	Free proofing & custom service, 5 free samples (shipping at buyer’s cost)
	Bulk Order	5,000 pieces and above with bulk pricing
Lead Time	All Standard Components	Shipped within 5–7 working days
	Custom Inductance / Pin Design (Sample)	Sample order confirmed within 5–7 working days
	Custom Inductance / Pin Design (Mass Order)	Shipped within 15–30 working days
Payment Terms	Main Payment Term	T/T in advance, L/C at sight
	Procurement Standard	Complies with global enterprise procurement standard for passive components
	Quality Deposit	No quality security deposit required
	Accepted Terms	FOB Shanghai / Nanjing / Hong Kong, T/T Advance
Quality Assurance	Manufacturing Defects	Free replacement for issues caused by manufacturing defects
Quality Assurance	Inspection Report	Batch inspection reports available as certification upon customer request
Packaging Specifications	Updated Packaging (2026)	Blister tray packaging; Sealed Tape & Reel for SMD products
Packaging Specifications	Optional Packaging	Vacuum sealed packaging for customers with strict moisture-proof requirements