Magnetics Business & Technology - January/February 2021 - 17

TECH TIPS
Table 1, Summary of Reliability Testing
Items

Condition

Passing
Units

High Temperature
Storage Life(HTSL)

105℃+2/-0, 1000h

20/20

Thermal Shock and
Humidity/Temperature
Cycling

Step1:-65℃ ~ 125℃/15min, 25cycle.

20/20

Step2:-10℃~65℃, 80%~98%RH, 10cycle (240h).

Temperature Cycling

Step1:105℃/6h baking.

20/20

Step2:-15C~85C, 5℃/min rate, dwell time 10min, 500 cycle

To summarize this 3 part series, embedded magnetics are
essentially fabricated as you would a printed circuit boards
and exhibit reliability consistent with most PCBs. Devices
are fabricated in a batch process using automated manufacturing technology. The labor content is a small fraction
of what is used to fabricate wire-wound magnetics. The fact
that the windings are defined by photolithography provides
a high degree of consistency from device to device. This is
particularly useful for RF applications, where the high frequency performance can be modeled and optimized before
a design is committed to fabrication.

(400hrs)
Random Vibration and
Mechanical shock

2

Step1:Random Vibration 20~500Hz, PSD 0.02g /Hz, RMS

20/20

3.10g, 15min/axial, XYZ axial.
Step2:Mechanical Shock 50g/11ms, 3cycle/direction, XYZ axial.

Hipot Test

Step1:1500Vrms, 1 min

20/20

down can occur vertically through a surface defect to the underlying trace, rather than between adjacent traces that reside
under the insulating layer. To prevent this from happening, 2 or
more solder mask layers should be applied to cover any micro
defects in the first layer. An alternative is to use a dry film or
polyimide cover lay material, which are homogeneous and have
dielectric breakdown voltages of 3000kV/mil (117kV/mm). The
cover-lay provides higher breakdown voltages; however the
material and process cost is higher than applying solder mask.
The GbE media filters in figure one have a polyimide cover-lay
and exhibit breakdown voltages exceed 2.5 kVrms.

www.MagneticsMag.com

About the Author: Jim Quilici

develops PCB magnetics for
Shennan Circuits (www.scc.com.
cn). He holds an MSEE from University of Arizona and has over 30
years of experience in developing
magnetics and microelectronics.
He has been awarded 9 patents associated with PCB magnetics. Jim also
is a part-time lecturer at California
State University Sacramento where
he teaches courses on Network
Analysis and Microelectronics. He
can be reached at jim.quilici@sccamerica.com.

January/February 2021 * Magnetics Business & Technology

17


http://www.scc.com.au http://www.scc.com.au http://metrolab.com http://www.MagneticsMag.com

Magnetics Business & Technology - January/February 2021

Table of Contents for the Digital Edition of Magnetics Business & Technology - January/February 2021

Magnetics Business & Technology - January/February 2021
Editor’s Choice/ Features
eTrucks and eBuses with Permanent Magnet Powertrains Charge into Commercial Vehicle Market
Linear Labs Rolls Toward Production of Its Magnetic Flux Tunnel Motors
Protean Electric’s In-Wheel Motor Reaches for Traction in Global EV and Industrial Markets
Embedding Magnetics Achieves Reliability & Consistency, Part 3 of 3
Tech Tips
Research & Development
Product News
Industry News
Events Calendar/ Advertising Index
Visions
Magnetics Business & Technology - January/February 2021 - Magnetics Business & Technology - January/February 2021
Magnetics Business & Technology - January/February 2021 - Cover2
Magnetics Business & Technology - January/February 2021 - 3
Magnetics Business & Technology - January/February 2021 - Editor’s Choice/ Features
Magnetics Business & Technology - January/February 2021 - 5
Magnetics Business & Technology - January/February 2021 - eTrucks and eBuses with Permanent Magnet Powertrains Charge into Commercial Vehicle Market
Magnetics Business & Technology - January/February 2021 - 7
Magnetics Business & Technology - January/February 2021 - 8
Magnetics Business & Technology - January/February 2021 - 9
Magnetics Business & Technology - January/February 2021 - Linear Labs Rolls Toward Production of Its Magnetic Flux Tunnel Motors
Magnetics Business & Technology - January/February 2021 - 11
Magnetics Business & Technology - January/February 2021 - Protean Electric’s In-Wheel Motor Reaches for Traction in Global EV and Industrial Markets
Magnetics Business & Technology - January/February 2021 - 13
Magnetics Business & Technology - January/February 2021 - 14
Magnetics Business & Technology - January/February 2021 - 15
Magnetics Business & Technology - January/February 2021 - Tech Tips
Magnetics Business & Technology - January/February 2021 - 17
Magnetics Business & Technology - January/February 2021 - Research & Development
Magnetics Business & Technology - January/February 2021 - 19
Magnetics Business & Technology - January/February 2021 - Product News
Magnetics Business & Technology - January/February 2021 - 21
Magnetics Business & Technology - January/February 2021 - 22
Magnetics Business & Technology - January/February 2021 - 23
Magnetics Business & Technology - January/February 2021 - 24
Magnetics Business & Technology - January/February 2021 - 25
Magnetics Business & Technology - January/February 2021 - Industry News
Magnetics Business & Technology - January/February 2021 - 27
Magnetics Business & Technology - January/February 2021 - 28
Magnetics Business & Technology - January/February 2021 - 29
Magnetics Business & Technology - January/February 2021 - 30
Magnetics Business & Technology - January/February 2021 - 31
Magnetics Business & Technology - January/February 2021 - Events Calendar/ Advertising Index
Magnetics Business & Technology - January/February 2021 - 33
Magnetics Business & Technology - January/February 2021 - Visions
Magnetics Business & Technology - January/February 2021 - Cover3
Magnetics Business & Technology - January/February 2021 - Cover4
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