Slide 1: CTVS Multilayer Varistors for Automotive
CTVS® Multilayer Varistors for Automotive Automotive E series for ESD and transient protection EPCOS AG A TDK Group Company Piezo & Protection Devices Business Group • Multilayer Technology Munich, Germany September 1, 2014
Slide 2: CTVS multilayer varistors: Contents
CTVS* multilayer varistors: Contents ● Product range 3 ● Functionality 7 ● Advantages vs. TVS diodes 11 ● Automotive E series 18 Key product data 18 Application examples 19 ESD protection for bus interfaces 23 Protection against high-energy transients 26 Design support 29 ● Annex 30 * Cera
Slide 3: CTVS multilayer varistors: Product range
CTVS multilayer varistors: Product range EPCOS CTVS (Ceramic Transient Voltage Suppressors) components feature excellent characteristics for a wide range of applications. ESD (Electro Static Discharge) and surge pulse protection is the key functionality. © EPCOS AG 2014 CTVS® Multilayer Varistors fo
Slide 4: CTVS multilayer varistors: just everywhere
CTVS multilayer varistors: just everywhere… High data rates for wireless communications High system integration in applications sensitive to ESD High safety and reliability, especially for automotive Reliable surge protection for telecom and industrial devices ESD protection of ESD/EMI prote
Slide 5: Application fields
CTVS multilayer varistors: Application fields Automotive The range of CTVS components suitable for automotive applications includes the product series multilayer varistors (automotive E series) and leaded transient voltage/ RFI suppressors (SHCV series). ● ESD protection according to ISO 10605/ IEC
Slide 6: Portfolio E series
CTVS multilayer varistors: Portfolio Shapes 150 °C Features • Case sizes EIA 0402 … 2220 + SHCV • Voltage range 14 … 60V • Qualification according to AEC-Q200 (E series) • ESD protection acc. to IEC61000-4-2 • Specified load dump & jump start • Low leakage current Single types Array types SHCV types
Slide 7: Functionality
CTVS multilayer varistors: Functionality Multilayer varistors or so-called Ceramic Transient Voltage Suppressors (CTVS) are voltage-dependent resistors with a symmetrical V/I characteristic curve whose resistance decreases with increasing voltage. Because of their application as overvoltage protecti
Slide 8: Design
CTVS multilayer varistors: Design Electrode Termination AgNiSn Ceramic layers ZnO ● The chip of a CTVS multilayer consists of a stack of alternating ceramic/ electrode layers. The thickness of the ceramic layers affects the protection level. ● In the active volume of the ceramic chip there are a num
Slide 9: V/I characteristic curve
CTVS multilayer varistors: V/I characteristic curve CTVS are operated in one of two modes. These modes concern two different segments of the CTVS V/I curve which lies within a well defined tolerance band : ● “High-resistance” mode (<1 mA) If the circuit is operated at normal operating voltage the
Slide 10: Transient environment
CTVS multilayer varistors: Transient environment Common automotive transients and test standards Phenomena ESD BURST/ EFT Surge Surge Load dump Jump start (electrical fast transients) Cause Electrostatic Switching Lighting Switching of Disconnected Use case discharge processes inductive loads batter
Slide 11: Package vs. TVS
CTVS multilayer varistors: Package vs. TVS CTVS multilayer varistor Semiconductor diode (TVS) No leads on the component Long leads on the component Low parasitic inductance Causes a high parasitic inductance No influence on clamping voltage Influences the clamping voltage level at very fast
Slide 12: Construction vs. TVS
CTVS multilayer varistors: Construction vs. TVS CTVS multilayer varistor Semiconductor diode (TVS) Epoxy molding Lead frame Silicon chip Plating and solder Millions of “P-N junctions” One “P-N junction” Energy absorption takes place Energy absorption only in the inside the ZnO grains and is relative
Slide 13: V/I characteristics vs. TVS
CTVS multilayer varistors: V/I characteristics vs. TVS CTVS multilayer varistor Semiconductor diode (TVS) Bidirectional Unidirectional © EPCOS AG 2014 CTVS® Multilayer Varistors for Automotive - E series A TDK Group Company PPD ML PM 09/14 13
Slide 14: Clamping voltage vs. TVS
CTVS multilayer varistors: Clamping voltage vs. TVS Tests acc. to IEC61000-4-2 method Y: Mean value of the clamping voltage between 30 and 100 ns, calculated by Multilayer varistors can significantly clamp the ESD peak pulse lower than TVS diodes, especially for high voltage >> 6 kV. © EPCOS AG 2014
Slide 15: Signal integrity vs. TVS
CTVS multilayer varistors: Signal integrity vs. TVS CTVS multilayer varistor Semiconductor diode (TVS) CTVS MLVs have typically a higher TVS have typically a lower clamping voltage clamping voltage The V/I curve is less steep The V/I curve is steep The diode does clip the RF signal The V/I c
Slide 16: RF filtering vs. TVS
CTVS multilayer varistors: RF filtering vs. TVS DPI method (Direct Power Injection): Continuous RF disturbance power (from 1 MHz to 1 GHz, yellow line) delivered by a generator is fed into a pin of a test board. By coupling out of interference power, a characterization of the immunity of the integra
Slide 17: ML varistors: Advantages vs. TVS diodes
CTVS ML varistors: Advantages vs. TVS diodes ● Surge current handling capability The interleaved electrode arrangement of multilayer ceramic devices allows surge currents of over 1 kA to be handled, whereas semiconductors can often withstand only a few amperes. This characteristic enables multilayer
Slide 18: Automotive E series
CTVS multilayer varistors: Automotive E series ● No temperature derating up to 150 °C ● Very high life time robustness up to 150 °C ● Voltage range 14 … 40 V with low leakage current (typ. <1 µA) ● Reliable ESD protection up to 30 kV acc. to IEC 61000-4-2 (8 kV contact, 15 kV air) ● Broad product ra
Slide 19: Automotive E series applications
CTVS ML varistors: Automotive E series applications CTVS multilayer varistors for automotive applications are generally used for ● ESD protection (e.g. acc. to ISO 10605/ IEC 61000-4-2) for bus interfaces (e.g. CAN, LIN, MOST, Ethernet, FlexRay) ● Protection against high-energy transients (e.g. jump
Slide 20: E series application examples 1/3
CTVS ML varistors: E series application examples 1/3 Top column module ESD protection for CAN bus interfaces Convenience (TCM) Type Ordering code CT0603K20G B72500E0200K060 CT0603K25G B72500E0250K060 CT0603K17LCG B72500E2170K060 CT0603S20ACCG B72500E5200S160 Body controller ESD protection for CAN bu
Slide 21: E series application examples 2/3
CTVS ML varistors: E series application examples 2/3 Infotainment ESD protection for CAN bus interfaces and protection Convenience against high-energy transients (battery lines) Type Ordering code CT0603V150RFG B72500E7151V060 CT2220S14BAUTOE2G2 B72540E3140S272 Rain & light sensor ESD protection for
Slide 22: E series application examples 3/3
CTVS ML varistors: E series application examples 3/3 Headlight ESD protection for CAN bus interfaces Type Ordering code Safety CT0603K20G B72500E0200K060 CT0603K25G B72500E0250K060 CT0603S20ACCG B72500E5200S160 Airbag ESD protection for CAN bus interfaces & protection ag. high-energy transients (ind
Slide 23: ESD protection for bus interfaces - basics
Varistors: ESD protection for bus interfaces - basics Electrostatic discharge (ESD) are fast and high voltage transients. ESD transients are frequently caused by touching a device or contact with the fingers. More than 15 kV can be charged in a human body, thus a protection device for ESD requires h
Slide 24: ESD protection for bus interfaces/ data lines
Varistors: ESD protection for bus interfaces/ data lines ESD protection of bus interfaces/ data line ESD pulses (acc. to IEC 61000-4-2/ ISO 10605) Key product data Product overview ● No temperature derating up to 150 °C ● High life time robustness up to 150 °C ● Low clamping voltage ● Low leakage cu
Slide 25: MLV for ESD protection: Selection guide
CTVS MLV for ESD protection: Selection guide CVS multilayer varistors E series for automotive for different data rates: From 20 kbit/s to 100 Mbit/s CTVS E series for automotive © EPCOS AG 2014 CTVS® Multilayer Varistors for Automotive - E series A TDK Group Company PPD ML PM 09/14 25
Slide 26: Protection against high-energy transients: Basics
Protection against high-energy transients: Basics Transients are divided into several pulses ● Transient voltages in automotive supply lines occur due to disconnection of inductive load, sudden interruption of currents or switching processes. These transients may damage components connected to the s
Slide 27: Protection against high-transients in automotive
Protection against high-transients in automotive Central load dump protection ISO 16750-2: Load dump pulse Test pulse A Test pulse B Key product data ● No temperature derating up to 150 °C ● High life time robustness up to 150 °C ● Low clamping voltage ● Low leakage current <1 μA ● Reliable ESD prot
Slide 28: Protection against transient pulses: Product range
Protection against transient pulses: Product range Load dump transients occurs ● Cable corrosion ● Poor or loose connection ● Intentional disconnection with the engine running Load dump specified in ISO 16750-2 A severe transient voltage, caused by disconnection of the vehicle battery from the alter
Slide 29: ML varistors for automotive: Design support
CTVS ML varistors for automotive: Design support Product brief ● Ceramic Transient Voltage Suppressors: Combined EMI filtering and ESD protection for high-speed bus systems Ordering no. EPC:63005-7600 Sample kits ● Ceramic Transient Voltage Suppressors: E Series of Multilayer Varistors for ESD and H
Slide 30: Annex
TDK Annex
Slide 31: Multilayer varistors: Important terms
Multilayer varistors: Important terms ● Operating voltage Vop Specified by maximum AC and DC operating voltages. These figures should only be exceeded by transients. Our multilayer varistor automotive E series is rated to withstand excessive voltage (jump start) up to 5 minutes. ● Varistor voltage V
Slide 32: Multilayer varistors: Microstructure
Multilayer varistors: Microstructure Sintering zinc oxide (ZnO) together with other metal oxide additives under specific conditions produces a polycrystalline ceramic whose grain boundary resistance exhibits a non-linear dependence on voltage. This phenomenon is called the varistor effect. At those
Slide 33: Product series at a glance
CTVS multilayer varistors: Product series at a glance ● Multilayer varistors (MLV) are components designed for circuit protection in automotive, industrial, communication and consumer electronics. Standard For general protection purpose Automotive E series AEC-Q200 qualified Low clamping voltage For
Slide 34: www.global.tdk.com • www.epcos.com
www.global.tdk.com • www.epcos.com