BCL Series Power Inductors

Figure 1 provides an overview of the BCL series. The BCL series consists of two sub-series: the BCL3520FT, which uses flat (rectangular) wire to achieve low RDC (DC resistance) and low inductance, and the BCL322520RT, which uses thin wire to achieve high inductance values.

The structure of the BCL series is illustrated in Figure 2. The BCL series consists of inductors manufactured using a wire-winding process. 
During fabrication, an air-core coil is molded with metal magnetic material, after which the wire leads extending from the bottom are connected to the terminals.

The BCL series uses metal magnetic materials with excellent DC bias (superimposition) characteristics, enabling it to handle higher current than ferrite inductors of the same size and shape.

Furthermore, the BCL series achieves lower RDC compared with similar products from other manufacturers as well as TDK’s ferrite inductors of equivalent size. 
This reduces heat generation and power loss in high-current power supply circuits, thereby contributing to higher efficiency.

Since the coil is a fully molded structure made of metal material, it results in low leakage flux. By using the BCL series, it is possible to achieve higher circuit efficiency, noise reduction, high current capability, and miniaturization.

	TDK BCL3520FT (3.3x3.5x2.0mm)	Company A Metal composite (3.2x3.5x2.0mm)	TDK  Ferrite Semi-Shield (3.0x3.0x1.5mm)	TDK  Ferrite Shield (4.5x3.0x2.0mm)	Peak Level [dBuV]
		BCL Similar Shape
Horizontal	Peak Level : 94.1 [dBuV]	Peak Level : 98.4 [dBuV]	Peak Level : 96.4 [dBuV]	Peak Level : 92.0 [dBuV]
Vertical	Peak Level : 99.1 [dBuV]	Peak Level : 104.6 [dBuV]	Peak Level : 99.9 [dBuV]	Peak Level : 94.3 [dBuV]

 [Measurement Conditions]
 Inductance 1.0μH
 Switching Frequency Fsw=2.2MHz
 Vin=12V、Vout=5.0V
 Iout=1.5A
 

Figure 6 shows application examples of the BCL series. With a guaranteed voltage rating of 40V, the BCL series can be used for input filters of 12V power supplies and DC/DC converters.
Within the 3mm square size, a wide lineup of inductance values is available, allowing selection of the optimal product based on switching frequency, inductance, and current requirements.

Click the links below to view detailed information on the BCL series or to request samples. By further expanding our lineup, we will continue to meet our customers' diverse needs for power circuit inductors.

Power inductors are inductors used for power supply circuit such as DC-DC converters. They are also called power coils or power choke coil. One of the inductors' characteristics is that they store energy by self-induction function. Chopper type DC-DC converters use inductors having such characteristics with switching devices for voltage conversion (see Figure 8).
Depending on the processing method, inductors can be classified into multilayer type, thin-film type, and wire-wound type. Since wire-wound type permits large current to flow, most of the power inductors are wire-wound type. Various wound-type power inductor products with ferrite or soft magnetic metal core are offered. Recently, the multilayer type and thin-film type, with which reduction of size and thickness can be achieved, are being improved to allow for larger current.