48V systems demand passive
components made from higher-quality
materials, offering improved mechanical
stability and greater robustness.
Additionally, compact designs and
integrated modules help minimize ESR
and ESL, enhancing overall performance."
Lucijan Korošec
Senior Power Electronics Engineer,
Magna International
Importantly, 48V systems do not cross the safety
threshold for electric shock. Most regulatory
frameworks draw that line at 60V of direct current
(DC). Staying below this limit enables original
equipment manufacturers (OEMs) to avoid the more
expensive connector insulation and safety isolation
requirements associated with high-voltage systems.
From a design standpoint, 48V systems do
not replace the 12V domain. Instead, they
supplement it. The vehicle still requires 12V
rails for legacy electronics, but 48V systems
now power newer higher-load subsystems. This
creates a mixed-voltage environment that
requires step-down DC-DC conversion that
introduces additional switching elements and
opportunities for EMI. These converters must
operate efficiently under tight thermal constraints
when embedded near heat sources like motors or
engine blocks.
Challenges for Passives at 48V
For passive components, challenges include higher
ripple current, faster switching transitions, and
greater EMI exposure.
C h a p t e r 1 | T h e 4 8V S h i f t— Po w e r i n g M o r e W i t h L e s s
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Powering the New Automotive Era with Smart Passive Solutions
