Surface Mount Technology (SMT) Varistors
Description
Surface Mount Technology (SMT) Varistors are electronic components designed to protect circuits from overvoltage conditions. They function as voltage-dependent resistors, where their resistance decreases as the voltage increases, forming a low-resistance path to shunt excess voltage away from sensitive components.
Working Principle
SMT Varistors operate by utilizing a ceramic-based structure that changes resistance in response to voltage levels. When the voltage across the varistor exceeds a certain threshold, its resistance drops significantly, allowing it to conduct current and divert the excess voltage away from the protected circuit. This mechanism is crucial for safeguarding electronic devices from voltage spikes caused by events such as lightning, inductive load switching, and electrostatic discharge (ESD). Their ability to quickly respond to overvoltage conditions makes them invaluable in maintaining the integrity and longevity of electronic systems.
Applications
SMT Varistors are employed in a wide range of applications due to their compact size and efficiency. They are particularly useful in automotive electronics, electric vehicles (EVs) and charging stations, building automation systems, household appliances, consumer electronics, power storage systems, and high-end power supplies. Their integration into these systems ensures reliable protection against voltage surges, enhancing the durability and performance of the devices.
Advantages over other Varistors
Compared to other varistor types, SMT Varistors offer several advantages. Their compact size allows for seamless integration into modern electronic designs, supporting fully automated and SMT PCB assembly processes. This is particularly beneficial in applications where space is limited, such as in automotive and consumer electronics. Additionally, SMT Varistors provide excellent repetitive surge capability and can operate at high temperatures, making them suitable for demanding environments.
Limitations
Despite their benefits, SMT Varistors have limitations. They may not be suitable for applications requiring extremely high energy absorption or where through-hole components are preferred for mechanical stability. Additionally, their performance can degrade over time with repeated exposure to high-energy surges, potentially necessitating replacement.
Considerations
When selecting SMT Varistors, several factors should be considered. Initial costs can vary depending on the specific requirements of the application, such as voltage and current ratings. Operating expenses are generally low, but it's important to account for potential replacement costs due to wear from repeated surges. Durability is a key advantage, but accuracy in voltage clamping can vary, so careful selection based on the application's voltage tolerance is essential. Maintenance costs are typically minimal, but regular inspection and testing can help ensure continued protection and performance.
from KOA Speer Electronics, Inc.
Features. Varistors own two-way symmetries and can absorb positive and negative surges. Multilayer construction allows its small size to absorb a large surge. Small space and high density mounting available due to the small package. Suitable for both flow and reflow solderings. Products with lead... [See More]
- Mounting Option: Surface Mount Technology
- Operating DC Voltage: 6.8
from DigiKey
VARISTOR 21.6V 5A 2SMD JLEAD [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from KOA Speer Electronics, Inc.
Features. SMD type metal oxide varistors. Ideal for countermeasures against ESD (Conforming to IEC61000-4-2). Symmetrical non-linearity V-I characteristics absorb positive and negative surge. High maximum energy type. Low leakage current. High resistance to cyclic temperature stress. Suitable for... [See More]
- Mounting Option: Surface Mount Technology
- Operating DC Voltage: 10
from DigiKey
8V 1A Varistor 1 Circuit Surface Mount, MLCV 0402 (1005 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 185
from KOA Speer Electronics, Inc.
Features. Varistors own two-way symmetries and can absorb positive and negative surges. Multilayer construction allows its small size to absorb a large surge. Small space and high density mounting available due to the small package. Suitable for both flow and reflow solderings. Products meet EU RoHS... [See More]
- Mounting Option: Surface Mount Technology
- Operating DC Voltage: 10.2
from DigiKey
VARISTOR MULTILAYER 27V 0402 [See More]
- Mounting Option: Surface Mount Technology; Other
from DigiKey
24V 120A Varistor 1 Circuit Surface Mount, MLCV 0805 (2012 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 302
from DigiKey
24V 120A Varistor 1 Circuit Surface Mount, MLCV 0805 (2012 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
24V 120A Varistor 1 Circuit Surface Mount, MLCV 0805 (2012 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
33V Varistor 1 Circuit Surface Mount, MLCV 1210 (3225 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 302
from DigiKey
68V 1.2kA Varistor 1 Circuit Surface Mount, MLCV 2220 (5750 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
VARISTOR 9.9V 80A 0805 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR 8.5V 10A 0402 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR 8.5V 20A 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR 9.9V 80A 0805 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR 11V 200A 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR MLV AUTO 9VAC [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR MLV AUTO 10VAC [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
22V 20A Varistor 1 Circuit Surface Mount, MLCV 0402 (1005 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
Varistor 1 Circuit Surface Mount, MLCV 0603 (1608 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
VARISTOR 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 185
from DigiKey
Varistor 1 Circuit Surface Mount, MLCV 0402 (1005 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
VARISTOR 36.5V 30A 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
VARISTOR 47.5V 200A 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from DigiKey
180V 400A Varistor 1 Circuit Surface Mount, MLCV 3225 (8063 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 257
from DigiKey
180V 400A Varistor 1 Circuit Surface Mount, MLCV 2-SMD, J-Lead [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40 to 185
from DigiKey
22V 120A Varistor 1 Circuit Surface Mount, MLCV 0805 (2012 Metric) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 302
from DigiKey
VARISTOR 22V 800A 1812 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67 to 257
from EPCOS AG
The development, manufacture and marketing of electronic components, modules and systems represents the largest business segment of the TDK Group. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. Electronic... [See More]
- Mounting Option: Surface Mount Technology
- Operating DC Voltage: 1465
- Lead Style: Radial; Axial; None
- Operating AC Voltage: 1100
from Karl Kruse GmbH & Co. KG
Karl Kruse is a worldwide leading franchised distributor (ISO: 9001-2008 certified). A service provider specializing in the supply and material management of electronic components, since 1951. We are an innovative company who is dedicated to collaborating with customers and partners to develop... [See More]
- Mounting Option: Surface Mount Technology
from Trigon Components, Inc.
SERIES. VMOC_C. DESCRIPTION. Suppressor, General Purpose Wide Range. VOLTAGE RANGE. 5 to 151V. ENERGY. 0.05 to 1.4J. TYP CAPACITANCE. 27 to 6200pF. PACKAGE. SMD 0402 to 1210. FEATURE. •Fast response time. •Full range from 0402 to 1210 series. •Working voltage from 2.5 to 95Vrms,. 3.3... [See More]
- Mounting Option: Surface Mount Technology
- Operating DC Voltage: 95
- Lead Style: None
- Operating AC Voltage: 270
from Littelfuse, Inc.
CH series transient surge suppressors are small, metal-oxide varistors (MOVs) manufactured in leadless chip form. They are intended for use in a variety of applications from low voltage DC to off-line board-level protection. These devices, which have significantly lower profiles than traditional... [See More]
- Mounting Option: Surface Mount Technology
- Operating AC Voltage: 75
- Operating DC Voltage: 132
from Utmel Electronic Limited
1.12kV 0.25W 75pF@1kHz 560V 30J 420V 680V 1.2kA SMD,11x8.2mm Varistors ROHS [See More]
- Mounting Option: Surface Mount Technology
from Littelfuse, Inc.
Littelfuse SM10 Varistor Series is the first surface-mount Metal Oxide Varistor (MOV) with ultra-high surge current handling capability, specifically designed for primary circuit transient voltage surge protection. The SM10 Varistor Series is constructed with an MOV disc and tin-plated terminals... [See More]
- Mounting Option: Surface Mount Technology
- Operating AC Voltage: 130
- Operating DC Voltage: 226
![BOURNS - CG0603MLC-05E - TVS Varistor, 8 V, 5 V, ChipGuard MLC Series, 20 V, 0603 [1608 Metric], Multilayer Varistor (MLV) -- 103-CG0603MLC-05E - Image](https://partimages.globalspec.com/49/3699/7533699_medium.png "BOURNS - CG0603MLC-05E - TVS Varistor, 8 V, 5 V, ChipGuard MLC Series, 20 V, 0603 [1608 Metric], Multilayer Varistor (MLV) -- 103-CG0603MLC-05E - Image")
from Utmel Electronic Limited
BOURNS - CG0603MLC-05E - TVS Varistor, 8 V, 5 V, ChipGuard MLC Series, 20 V, 0603 [1608 Metric], Multilayer Varistor (MLV) [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 8
- Operating DC Voltage: 5
- Operating Temperature: -40
from Littelfuse, Inc.
The Littelfuse SM7 Series is a plastic-encapsulated surface-mount metal oxide varistor (MOV) transient voltage surge suppressor that is designed to be operated continuously across AC power lines. The series comprises a Nylon molded package with tin plated lead frame for soldering to board. The... [See More]
- Mounting Option: Surface Mount Technology
- Operating AC Voltage: 275
- Operating DC Voltage: 473
from Utmel Electronic Limited
VARISTOR 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40
from Littelfuse, Inc.
The Littelfuse SM20 Series is a 20mm SMD metal oxide varistor device. The AC rated parts are designed to operate continuously across AC power lines. The DC rated parts are suitable for Automotive applications. The series comprises a Nylon molded package with folded tin plated metal leads for... [See More]
- Mounting Option: Surface Mount Technology
- Operating AC Voltage: 175
- Operating DC Voltage: 303
from Utmel Electronic Limited
VARISTOR 100V 400A 1812 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 60
- Operating DC Voltage: 100
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 12.7V 30A 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 6.4
- Operating DC Voltage: 12.7
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 12.7V 30A 0805 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 6.4
- Operating DC Voltage: 12.7
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 120V 250A 2SMD [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 75
- Operating DC Voltage: 120
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.1V 150A 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 20.3
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.1V 30A 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 18.1
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.5V 150A 1206 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 18.5
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.5V 20A 0402 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 18.5
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.5V 40A 0805 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 18.5
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 18.7V 30A 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 10
- Operating DC Voltage: 18.7
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 22V 0402 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 22V 400A 1210 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -67
- Operating AC Voltage: 14
from Utmel Electronic Limited
VARISTOR 25V 500A 1210 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 14
- Operating DC Voltage: 25
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 27V 0402 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 27
- Operating DC Voltage: 27
- Operating Temperature: -40
from Utmel Electronic Limited
VARISTOR 27V 0603 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 27
- Operating DC Voltage: 27
- Operating Temperature: -40
from Utmel Electronic Limited
VARISTOR 41.5V 30A 0805 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 25
- Operating DC Voltage: 46
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 47V 800A 1812 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 30
- Operating DC Voltage: 42.3
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 70V 4A 0405 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 14
- Operating DC Voltage: 70
- Operating Temperature: -67
from Utmel Electronic Limited
Varistors 385Vdc 400A 9600mJ 100mW CU3225K300G2 [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating Temperature: -40
from Utmel Electronic Limited
VISHAY - MLV0603E30703T - VARISTOR, 0603, 30A, 7V [See More]
- Mounting Option: Surface Mount Technology; Other
- Operating AC Voltage: 7
- Operating DC Voltage: 14
- Operating Temperature: -67