Sumida Expands its Line of Automotive SMD Power InductorsOctober 05, 2020 by Gary Elinoff
The new line of AEC-Q200 qualified high-current inductors tolerate the high temperatures characteristic of the automotive environment.
The new CDEP13D**/T150 line of surface mounted device (SMD) power inductors encompass ten high-power devices and ten standard types. As described by Sumida, the new family of inductors offer benefits not found in similar devices. These include magnetic shielding, high insulation voltage, temperature tolerance and high current capacity.
Modified Image courtesy of Sumida
Taking the Heat
Inductance values for the new series of inductors range from 0.8 to 22 µH. Defining saturation current as the actual value of DC current that causes the inductance becomes 30% lower than its stated nominal value, this parameter ranges from 5.5 to 32 amps at 20℃ and from 3.8 to 21.6 amps at 150℃.
The new products are said by Sumida to be an outgrowth of their current CDEP15D**/T150 line.
These devices feature saturation currents of between 50.4 an 8.8 amps at 20℃, and from 34.4 and 6 amps at 150℃.
This older line, like the new CDEP13D**/T150 line, can operate at 150℃. Members of both lines feature a 120 VDC withstand voltage. Like the newer line, the 20 CDEP15D**/T150 units are divided into 10 standard types and ten high power types. This higher series can
Ferrite Cores and Flat Coil Windings for Stronger Performance
These SMD Power inductors feature Mn-Zn (Manganese-Zinc) ferrite cores, allowing for not only high-magnetic permeability, but also for low power losses, even at the elevated switching frequencies characteristic of automotive power circuitry.
The devices feature flat-coil windings, which serve to counter the “skin-effect” and to enable better high frequency performance. Flat coil windings also present lower DC resistance, and take up less space than round coil winding inductors.
The geometry of the new inductors was conceived with an eye to providing very effective magnetic shielding. Because of the cramped, densely packed environment of automotive electronics, this is of ever-more importance, because EMI/RFI can have a devastating effect on the operation on electronic circuitry.
Sumida provides extensive documentation for both the CDEP13D76/T150 series and the CDEP15D90/T150 series of SMD power inductors. The information includes saturation current and temperature rise graphs for each member of the series.
Image courtesy of Sumida
The above image is the saturation current and temperature rise graph for the CDEP13D76T150NP-6R8MC-105, one of the CDEP13D76/T150 series’ high-current devices
Applications for the DEP13D**/T150 line of SMD Inductors
These new devices will serve well in any high-reliability application that must tolerate a wide temperature range, including:
- Powertrain Control Modules (PCM)
- Hybrid Engine Controls
- LED Headlight Driver Modules
- Adaptive Driving Beam (ADB)
- Adaptive LED Boards
- Adaptive Front-lighting System (AFS)
- Daylight Running Light (DRL) systems
- Pulse Width Dimming (PWD) circuits
The compact CDEP13D**/T150 devices measure 13.5 x 13.5 x 10 mm. In addition to being AECQ100 qualified, the new units are also halogen free and RoHS compliant. Members of the DEP15D**/T150 line are also about 2 mm longer and wider than members of the new CDEP13D**/T150 line.
Headquartered in Japan, Sumida is a manufacturer of inductors and transformers for RF signal, power, and sensing applications. These devices are used in a range of markets, including communications, automotive, consumer electronics, renewable energy, and medical technology.