SMD Choke Coils , Toroidal Inductors , Surface Mount Inductor

Introduction:

• In general, a toroidal inductor/transformer is more compact than other shaped cores because they are made of fewer materials and include a centering washer, nuts, and bolts resulting in up to a 50% lighter weight design. This is especially the case for power devices.
• Because the toroid is a closed-loop core it will have a higher magnetic field and thus higher inductance and Q factor than an inductor of the same value with a straight core (solenoid coils). This is because most of the magnetic field is contained within the core. By comparison, with an inductor with a straight core, the magnetic field emerging from one end of the core has a long path through air to enter the other end.
• In addition, because the windings are relatively short and wound in a closed magnetic field, a toroidal transformer will have a lower secondary impedance which will increase efficiency, electrical performance and reduce effects such as distortion and fringing.
• Due to the symmetry of a toroid, little magnetic flux escapes from the core (leakage flux). Thus a toroidal inductor/transformer, radiates less electromagnetic interference (EMI) to adjacent circuits and is an ideal choice for highly concentrated environments. We have adopted toroidal coils in recent years to comply with increasingly strict international standards limiting the amount of electromagnetic field consumer electronics can produce.

Features:

• Low impedance of working frequency band and high impedance of interference frequency .
• High permeability, low loss, inductance ranging from several microhertz to several hundred millihertz, maximum operating current up to tens of amperes.
• Stable inductance value and good thermal stability.
• CE, UL, RoHS compliant Lead-free products with high saturation current, low magnetic leakage and environmental friendly.
• good attenuation of frequency
• Highly reliable lightweight
• Compact and provides a large inductance
• Prevention of noise emitted from other components.
• Custom designs are provided for different requirement according to Electrical Characteristics: Inductance Range, Inductance Tolerance , Related Current, Operating temperature ...etc

Application:

• Noise filter/Radiation interference suppressor
• Main Applications of Ring Inductor Products
• Noise suppression filter of switching power supply;
• Electrostatic noise filters for power and signal lines;
• Radiation interference suppressors such as converters and ultrasonic devices.
• Switching power supplies
• Television image equipment (such as television and video recorder), office automation equipment, audio equipment, communication equipment, measuring instruments, motors and their equipment.
• Lighting enquipment
• Industrial controls
• Electronic instruments
• Others...

Notes:

• Test frequency: 100KHz,0.1V
• Testing Instrument : L:HP4284A, WK3260B, WK3261A
• All test data is referenced to 25℃ ambient
• Idc: DC current (A) that will cause an approximate △T of 40℃
• Isat: DC current (A) that will cause Lo to drop approximately 25%
• Operating temperature range -40℃ to +125℃ (Including temperature rise 40℃ Max)
• Storage temperature range -40℃ to +85℃
• UL 94V-0 packaging materials
• J-STD-020D reflow
• Custom inductance values available

Note:1. K=±10%,M=±20%,N=±30%

Note: Product specifications can be customized.