Stackpole Introduces New Leaded Thru-Hole Power Inductors

Stackpole Electronics, Inc. introduced two new series of ferrite bobbin inductors. Designated the DRGH and DRGR Series, they are available in a wide range of inductance values with tight tolerances and remarkably low dc resistance. The parts are intended to provide solutions to many design challenges where low cost and high-power performance are important. The precise control of core materials creates the exceptionally large range of values and contributes to the ability of the DRGH and DRGR inductors to achieve tolerances as tight as 5%. Both series are DIP power inductors, but the DRGR features a ferrite sleeve to effectively shield nearby components from the EMI.

The addition of this type of leaded power inductor fills a significant void in the Stackpole power inductor offering. Bobbin-style inductors are a popular choice for applications requiring both noise attenuation and protection of sensitive components. The single layer of windings generates very low parasitic capacitance, making both series efficient power chokes. The DRGH and DRGR are typically larger than many SMD power chokes, creating two distinct advantages. First, the large size enables the DRGH and DRGR to handle large currents with low saturation losses, a key requirement in today’s design environment. Second, the relatively large size and thru-hole configuration help the DRGH and DRGR efficiently transfer heat away from the part, minimizing susceptibility to overheating which is a common cause of power inductor failures.

The versatility of the DRGH and DGR Series makes them suitable for a wide array of applications. The noise attenuation and low saturation losses make them suitable for personal computers and high-power/high-frequency power supplies. Furthermore, the variety of sizes available and robust surge capability makes them suitable in a number of battery-supplied devices, such as electronic testing equipment and many other higher-power portable electronic devices.

The DRGH Series is a non-shielded power choke available in values from 10 to 47,000µH, is rated for current up to 5.3A, and offers dc resistance as low as 50mΩ. The DRGR is magnetically shielded and available in values from 10 to 10,000µH, with current ratings up to 3.9A. Both series are available in diameters between 6mm and 10mm, and offer significant cost and space savings over comparable toroid inductors. For both series, the larger part sizes have four leads instead of two to enhance mechanical integrity.

Pricing for the DRGH is typically $.138 to $.161, and DRGR pricing is around $.185 to $.219. Lead times for both series are eight to 10 weeks, with samples available in three to four weeks.