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Major
Additions and Improvements Multilayer Surface Mount Transient Voltage Suppressors (TVS) are manufactured from semiconducting ceramics by the highly advanced multilayer formation technologies, which can offer rugged protection, excellent transient energy absorption and internal heat dissipation. The devices are leadless chip form, eliminating lead inductance and guaranteeing a faster speed of response time of less than 0.5ns, which makes them fast enough to ensure reliable protection against ESD pulse and other specific transient events. These transient suppression devices have significantly smaller footprints and lower profiles than traditional Zener diodes or radial MOVs. SMD Transient Voltage Suppressors
Information for Designer Transient
Voltage Suppressors (varistors) are voltage-dependent electrical resistors
with symmetrical V/I characteristic. Their resistance value decreases with
increasing voltage, thus “short-circuiting”
further rises in over voltage. The Prevention of Over voltageIn other words, as long as the voltage increases above the threshold of the TVS, the suppressor will draw a rapidly increasing current, and then the over voltage is considerably attenuated away from the protected circuit. That is why the inherent protection of the equipment should be supplemented by including specific components that will raise the withstand capabilities to the required level. Varistors provide protection against all kinds of over voltage and prevent electronic equipment from being damaged by transient events. |
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When selecting the TVS for designing
within the circuit, some characteristic parameter should be considered
carefully to meet the circuit condition. The following guidelines are
recommended. 1. The surge handling ability of the
selected TVS should meet the need of dissipating
the expected transient surge current of the protected circuit. 2. The clamping voltage of the
selected TVS should be less than the maximum allowed 3. In high speed data transmission situation, the capacitance of the selected TVS should be considered. 4. The special requests of the TVS's
capacitance such as ESD prevention are available,
please contact us. 5. While choosing the TVS, the working voltage of the TVS should be greater than or equal to the normal operating voltage of the circuit.
Typical Application Telecommunications Private
branch exchanges –X- Telephone subscriber sets -X-Telephone push button
modules Telephone answering
sets Power supply units Transmitting systems Automotive
electronics Central
protection of automotive electrical systems -X-Load-dump protection
-X-Anti-skid controls -X-Trip recorders X-Radios -X-Motor controls
-X-Generator rectifiers -X-Central locking systems -X-Trip computers
-X-Wiper motors -X-Window lift motors -X-Airbag electronics X-Car phones
-X- Seat memories Data
systems Data
transmission lines -X- Power supply units -X- Personal computers Measuring
and control equipment
Tele metering systems -X- Remote
control systems -X- Machine tool control systems - X- Elevator control
systems -X-Alarm systems X-Proximity switches -X-Lighting controls -
X-Power supply units -X-Ground-fault interrupters -X-Gas heating
electronics-X- Electronic ballasts Stepped
protection Protection
of microelectronic systems X- EMI/RFI suppression -X- EMP/NEMP suppression
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Consumer
electronics Washing
machine control systems -X-Dimmers -X-Lamps -X-Quartz clocks
-X-Electric-motor tools X-Thermostats Medical
equipment Diagnostic
equipment X-Therapeutic equipment X- Power supply units Power
electronics Bridge
rectifiers -X-Brake rectifiers -X-Electric welding -X-Electric vehicles
X-Switch-mode power supplies Power
engineering Transformers
X- Inductors -X- Motor and generator windings X-Transmission line Entertainment
electronics Video
sets -X-TV sets -X-Slide projectors -X-Power supply units Traffic
lighting installations Traffic light systems -X-Runway lighting systems -X-Beacon lights |
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Comparison
of Characteristics of
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Metal
Oxide Varistors
Specifications in catalogs maybe subject to change without notice. |
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Performance
test data in the catalogs show typical values, which are not assured in
the catalogs. |
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For More Information Contact:
Inova Inc.
26331 Yolanda St. Laguna Hills, CA 92656
Tel: 949-916-9823
FAX: 949-916-1832
Internet: sales@inovatvs.com
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