What are multilayer varistors (MLVs)?
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MLVs are multilayer semiconductor ceramic components for ESD protection of safety-
relevant data lines and bus systems and for high-energy transient protection (e.g. load
dump and jump start) in automotive electronic devices.
MLVs can replace semiconductor diodes.
Benefits for customer applications
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Bidirectional protection for ESD and high energy transients
Low capacitance types for bus systems
Use of parasitic capacitance for RFI suppression and RF filtering
(replacement of additional MLCC)
High signal integrity due to low non-linearity
no signal distortion
Use at temperatures up to 150 °C
No temperature derating up to 125 °C/150 °C (depending on type)
High energy handling capability
Low parasitic inductance
Low leakage current
Fast response time < 0.5 ns
Qualification
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Reliability based on AEC-Q200, Rev. C
ESD protection according to IEC61000-4-2 and ISO10605
Jump start and load dump protection to ISO7637
Overview of transient overvoltages
Electrostatic discharge (ESD)
Surge (high energy transients µs)
Burst (fast transient single pulse ns)
Switched inductive loads
Load dump
Jump start
Selection Guide
Typical requirements for automotive applications
ESD protection.
Typical applications: Bus systems, car infotainment. Typical case sizes: 0603, 0805
ESD specification (e.g. IEC, ISO, AEC, JEDEC, HBM, customer specification)
Type of bus system (e.g. LIN, CAN, FlexRay) defines capacitance requirement on protection device
Special capacitance range (controlled
capacitance, low capacitance, high-speed)
Enhanced temperature requirement (150 °C)
High temperature (HT) range
Load dump/jump start protection.
Typical application: battery line. Typical case sizes: 1210, 2220
Load dump / jump start requirements (e.g. ISO 7637)
Additional requirements (e.g. centralized or module protection)
Enhanced temperature requirement (150 °C)
AUTO range
AUTO high temperature range
Transient voltage/RFI suppression.
Typical application: DC motors. Typical case sizes: SR1 (1812), SR2 (2220), SR6 (1206)
RFI suppression requirements:
Noise suppression level (e.g. VDE 0879, part 3), capacitance value, frequency range
Additional requirements (e.g. load dump, jump start, ISO 7637, JASO)
Leaded transient voltage / RFI suppressors (SHCV)
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Surge current protection.
Typical application: motors. Typical case sizes: 3225, 4032
Additional requirements (e.g. load dump, jump start)
SMD disk varistors AUTO range (CU AUTO)
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For samples or further information please contact your EPCOS sales office.
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