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SMD Transient Voltage Suppressors
Table of contents
Table of Contents…………………………………………..……… 1-1
Introduction…………………………………………………..….. 2-2
Transient Voltage Suppressors…………………………………. 3-3
Information for Designer…………………………………………. 4-5
Multilayer varistor introduction …………………….….……… 6-6
Part number identification ………………………………… 7-7
ML - A Series High surge protection………………………….. 8-8
ML - C Series Classification…….………………………………. 9-11
CH Series………………..………………………………….……… 12-12
ESD solution protection varistor…………………………. 13-13
Array Varistor…………………………………………………
14-14
MOV Disc Varistor protection……………………………….. 15-15
New development item
16-16
Package information…………………………………………….. 17-17
Typical application ………………………………………………. 18-18
Test information………………………………………….………. 19-19
Reliability experiment……………………………………………. 20-20
Recommendation for soldering……………………………….. 21-22
Cross reference ……………………………………………..
23-24
1
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SMD Transient Voltage Suppressors
Introduction
Company Profile
SFI, is the trading mark and logo of SFI
Groups, which are established under the
spiritual concept of “Innovation, Services,
Quality, and sincerity”. There are three
subsidiary companies under SFI Groups,
including Sun Flower semiconductor Co.,
Ltd established in Aug 1999known as Sun
Flower Instruments Inc. established in 1984
is responsible for the production mainly on
mono-chip, multilayer chip TVS, advanced
varistors etc. and the nearly completed brand
factory, Leader Well Technology Co., Ltd for
satisfying the tremendous supplies of the
worldwide demand on the varistor in the new
century, and the mission of SFI Electronics
Technology Inc is responsible for the
marketing and sales under the independent
responsibilities on production, marketing and
sales.
Advanced Techniques Applied
In order to meet the market trend and fast
market change, we build our R&D team to
control the reliability and stability of the
products. We have been utilizing the
advanced material and manufacturing
techniques on producing the electronic
elements and parts. In Taiwan, we are the first
company to launch the Zinc Oxide (ZnO)
based Ceramic Semiconductor devices with
full range and with the highly advanced
multilayer formation technologies to apply the
high density circuit assemblies. We obtained
many kinds of patents and awards for
excellent product designs, and had been
selected by government to attend the inter-
national trade fair on behalf of Taiwan.
Our SFI varistors and TVSs reliably protect
the electronics systems from overvoltages by
limiting surge voltages and by absorbing
energy. They are used to safeguard the
components, to ensure electromagnetic
compatibility and suppress the transients
caused by electrostatic discharge. In other
words they have the added advantage of
greater surge current and energy handling
capabilities as well as EMI/RFI attenuation.
SFI varistors and TVSs have established
themselves as a secure and low-cost means
of protection in general-purpose use.
2
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SMD Transient Voltage Suppressors
Transient Voltage Suppressor
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 gua-
ranteeing 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 are
significantly smaller footprints and lower
profiles than traditional zener diodes or radial
MOVs,
Material
1. Body material: ZnO
2. Termination: electrode
Ag/Ni/Sn
termination
is
multilayer formation technologies
Section of the chip
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SMD Transient Voltage Suppressors
Information for Designer
Voltage Dependent Characteristic
Transient Voltage Suppressorsvaristors
are voltage-dependent electrical resistors
with symmetrical V/I characteristic and the
breakdown region, their resistance value
decreases with increasing voltage, thus
“short-circuiting” further rises in overvoltage.
Breakdown
Region
Current A
The Prevention of Overvoltage
In other words, as long as the voltage increases
above the threshold of the TVS, the suppressor
will draws a rapidly increasing current, and then
the overvoltage is considerably attenuated away
from the protected circuit, that is why the
inherent protection of the equipments should be
supplemented by including specific components
that will raise the withstand capabilities to the
required level. Varistors provide protection
against all kinds of overvoltage and prevent
electronic equipment from being damaged by
transient events.
Normal State
Circuit to be
Protected
Overvoltages occur
Overvoltage State
Circuit to be
Protected
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SMD Transient Voltage Suppressors
Information for Designer
When selecting the TVS for designing within the circuit, some characteristic parameter should
be considered carefully to meet the circuit condition. The following guideline 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
operating voltage of the protected circuit.
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 with 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.
INPUT
OUTPUT
System
to be
Protected
Overvoltage
System Max. allowed
operating voltage
Clamping Voltage Level
System Rated Voltage
INPUT
OUTPUT
6. Protection Principle : When the voltage increase above the threshold of the varistor, the suppressor
draws a rapidly increasing current. The the overvoltage is considerably attenuated.
Transient
Clamping
Vc Transient voltage
Transient Current
Protected
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