Through Hole Technology (THT) Varistors
Description
Through Hole Technology (THT) 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, effectively shunting excess voltage away from sensitive components.
Working Principle
THT Varistors operate by forming a low-resistance path when the voltage across them exceeds a certain threshold. This behavior is due to their ceramic-based, polycrystalline structure, which allows them to absorb and dissipate the energy from voltage spikes. This capability makes them highly effective in protecting electronic circuits from transient voltage events such as lightning strikes, inductive load switching, and electrostatic discharge (ESD). Their symmetrical breakdown characteristics enable them to clamp transient voltages to safe levels, preventing damage to the circuit.
Applications
THT Varistors are used in a variety of applications where circuit protection from overvoltage is critical. Specific examples include industrial automation controls, solar power inverters, security systems, fire alarm and smoke detectors, smart meters, outdoor LED lighting, and base transceiver station (BTS) power supplies. They are also employed in harsh environment and outdoor power supplies, where they provide reliable protection against voltage surges.
Advantages over other Varistors
One of the key advantages of THT Varistors over other types is their ability to handle high surge currents, with ratings up to 10 kA (8/20µs). They also offer high isolation voltage, up to 2500 V, and can operate at elevated temperatures, reducing the need for additional cooling components such as heat sinks. This makes them particularly suitable for applications requiring high reliability and performance under thermal stress.
Limitations
Despite their advantages, THT Varistors have limitations, including their physical size, which can be larger compared to surface mount technology (SMT) varistors. This can be a constraint in applications where space is limited. Additionally, their performance can degrade over time with repeated exposure to high-energy transients, potentially requiring replacement to maintain effective circuit protection.
Considerations
When selecting THT Varistors, several factors should be considered. Initial costs can vary based on the varistor's specifications, such as voltage and current ratings. Operating expenses are generally low, but durability can be affected by the frequency and magnitude of voltage transients encountered. Accuracy in clamping voltage is crucial for effective protection, and regular maintenance checks are recommended to ensure the varistors are functioning correctly. Replacement costs should also be factored in, especially in environments with frequent overvoltage events.
from DigiKey
430V 1.2kA Varistor 1 Circuit Through Hole Disc 7mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
620V 4.5kA Varistor 1 Circuit Through Hole Disc 12.50mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
VARISTOR 1KV 3.5KA DISC 10MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
1.8kV 3.5kA Varistor 1 Circuit Through Hole Disc 10mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
270V 4.5kA Varistor 1 Circuit Through Hole Disc 14mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from DigiKey
180V 2.5kA Varistor 1 Circuit Through Hole Disc 10mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
180V 6.5kA Varistor 1 Circuit Through Hole Disc 20mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
180V 3.5kA Varistor 1 Circuit Through Hole Disc 10mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
180V 6kA Varistor 1 Circuit Through Hole Disc 14mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
180V 12kA Varistor 1 Circuit Through Hole Disc 20mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
VARISTOR 240V 5KA DISC 10MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
100V 1.2kA Varistor 1 Circuit Through Hole Disc 7mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
VARISTOR 100V 1.2KA DISC 7MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
VARISTOR 620V 1.2KA DISC 7MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
100V 4.5kA Varistor 1 Circuit Through Hole Disc 14mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 185
from DigiKey
VARISTOR 1KV 4.5KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
VARISTOR 56V 1KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
100V 6.5kA Varistor 1 Circuit Through Hole Disc 20mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
VARISTOR 1.5KV 6.5KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 221
from DigiKey
180V 3.5kA Varistor 1 Circuit Through Hole Disc 10mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40 to 257
from DigiKey
180V 6kA Varistor 1 Circuit Through Hole Disc 14mm 3-Lead [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from DigiKey
314V 6kA Varistor 1 Circuit Through Hole Disc 14mm 3-Lead [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from DigiKey
360V 6kA Varistor 1 Circuit Through Hole Disc 14mm 3-Lead [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from DigiKey
620V 6kA Varistor 1 Circuit Through Hole Disc 14mm 3-Lead [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from DigiKey
270V 10kA Varistor 1 Circuit Through Hole Disc 20mm [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67 to 185
from M&I Materials Limited
Introduction. This data sheet describes the range of Metrosilvaristors of 26mm diameter, which are supplied with radial wire leads. Coating/protection. PVC is standard, but epoxy coating can besupplied. Identification is provided by the colour of the coating or by printing on it. Specification. By... [See More]
- Mounting Option: Through Hole
- Diameter: 26
- Lead Style: Radial
- Operating DC Voltage: 290
from Trigon Components, Inc.
SERIES. VMO05. DESCRIPTION. Transient/Surge Absorber, Ø5mm. VOLTAGE RANGE. 18 to 560V. ENERGY. 0.6 to 20J. TYP CAPACITANCE. 40 to 2400pF. PACKAGE. Radial. FEATURE. •Fast response time. •Low leakage current. •Excellent voltage & energy ratio. •Low standby power and no... [See More]
- Mounting Option: Through Hole
- Diameter: 5
- Lead Style: Radial
- Temperature Coefficient: -0.05% / C
from Littelfuse, Inc.
Metal Oxide Varistors (MOVs)are rated for specific AC line operating voltages, and exceeding these limits through the application of a sustained abnormal over-voltage condition could result in overheating and damage to the MOV. The Littelfuse TMOV25S ™ (Thermal MOV) Series was designed to... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 198
- Lead Style: Radial
- Operating AC Voltage: 115
from Utmel Electronic Limited
EPCOS B72207S0170K101 VARISTOR, 1.1J, 17VAC [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40
from Trigon Components, Inc.
SERIES. VMO07. DESCRIPTION. Transient/Surge Absorber, Ø7mm. VOLTAGE RANGE. 18 to 560V. ENERGY. 1.2 to 39J. TYP CAPACITANCE. 75 to 3500pF. PACKAGE. Radial. FEATURE. •Fast response time. •Low leakage current. •Excellent voltage & energy ratio. •Low standby power and no... [See More]
- Mounting Option: Through Hole
- Diameter: 7
- Lead Style: Radial
- Temperature Coefficient: -0.05% / C
from Littelfuse, Inc.
Metal Oxide Varistors (MOVs)are rated for specific AC line operating voltages, and exceeding these limits through the application of a sustained abnormal over-voltage condition could result in overheating and damage to the MOV. The Littelfuse TMOV25S ™ (Thermal MOV) Series was designed to... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 240
- Lead Style: Radial
- Operating AC Voltage: 140
from Utmel Electronic Limited
EPCOS B72220S0381K101 VARISTOR, 150J, 385VAC [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40
from Trigon Components, Inc.
SERIES. VMO10. DESCRIPTION. Transient/Surge Absorber, Ø10mm. VOLTAGE RANGE. 18 to 1100V. ENERGY. 2.4 to 124J. TYP CAPACITANCE. 90 to 7500pF. PACKAGE. Radial. FEATURE. •Fast response time. •Low leakage current. •Excellent voltage & energy ratio. •Low standby power and... [See More]
- Mounting Option: Through Hole
- Diameter: 10
- Lead Style: Radial
- Temperature Coefficient: -0.05% / C
from Littelfuse, Inc.
The C-III Series of metal oxide varistors are specifically designed for high surge energy absorption ratings. This is achieved through a special dielectric material formulation which also results in higher repetitive surge ratings than other MOV types.The C-III series is primarily intended for use... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 1800
- Lead Style: Radial
- Operating AC Voltage: 1000
from Utmel Electronic Limited
LC Series ?7 mm 320 VAC 420 VDC 1.2 kA Radial Metal Oxide Varistor [See More]
- Mounting Option: Through Hole; Other
- Lead Style: Radial
from Trigon Components, Inc.
SERIES. VMO14. DESCRIPTION. Transient/Surge Absorber, Ø14mm. VOLTAGE RANGE. 18 to 1800V. ENERGY. 4.7 to 342J. TYP CAPACITANCE. 120 to 18000pF. PACKAGE. Radial. FEATURE. •Fast response time. •Low leakage current. •Excellent voltage & energy ratio. •Low standby power and... [See More]
- Mounting Option: Through Hole
- Diameter: 14
- Lead Style: Radial
- Temperature Coefficient: -0.05% / C
from Littelfuse, Inc.
The C-III Series of metal oxide varistors are specifically designed for high surge energy absorption ratings. This is achieved through a special dielectric material formulation which also results in higher repetitive surge ratings than other MOV types.The C-III series is primarily intended for use... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 228
- Lead Style: Radial
- Operating AC Voltage: 130
from Utmel Electronic Limited
Metal Oxide Varistor, 420V, 1.12Kv, Radial [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Operating DC Voltage: 680
from Trigon Components, Inc.
SERIES. VMO20. DESCRIPTION. Transient/Surge Absorber, Ø20mm. VOLTAGE RANGE. 18 to 1800V. ENERGY. 9.4 to 682J. TYP CAPACITANCE. 220 to 39000pF. PACKAGE. Radial. FEATURE. •Fast response time. •Low leakage current. •Excellent voltage & energy ratio. •Low standby power and... [See More]
- Mounting Option: Through Hole
- Diameter: 20
- Lead Style: Radial
- Temperature Coefficient: -0.05% / C
from Littelfuse, Inc.
The HMOV ™ Varistor Series is specifically designed for applications requiring high surge energy absorption and high operating temperature of 125 °C. The maximum peak surge current is rated up to 10kA (8/20 μs pulse) to protect against indirect lightning strikes, switching surge... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 162
- Lead Style: Radial
- Operating AC Voltage: 115
from Utmel Electronic Limited
Radial Varistor 20MM Rohs/lead Free [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -67
- Lead Style: Radial
from Littelfuse, Inc.
The UltraMOVTM 25S Varistor Series is designed for applications requiring high peak surge current ratings and high energy absorption capability. UltraMOVTM varistors are primarily intended for use in AC Line Voltage applications or other products that require voltage clamping of high transient surge... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 198
- Lead Style: Radial
- Operating AC Voltage: 115
from Utmel Electronic Limited
VARISTOR 1.1KV 5KA DISC 13MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 14
- Lead Style: Radial
- Operating DC Voltage: 1100
from Littelfuse, Inc.
The high reliability Liettelfuse varistor is the latest step in increased product performance, and is available for applications requiring quality and reliability assurance levels consistent with military or other standards. (MIL-STD-19500, MIL-S-750, Method 202.) Additionally, Littelfuse varistors... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 225
- Lead Style: Radial
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 1.2KV 10KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Operating DC Voltage: 1200
from Littelfuse, Inc.
The high reliability Liettelfuse varistor is the latest step in increased product performance, and is available for applications requiring quality and reliability assurance levels consistent with military or other standards. (MIL-STD-19500, MIL-S-750, Method 202.) Additionally, Littelfuse varistors... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 225
- Lead Style: Radial
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 1.65KV 4.5KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 14
- Lead Style: Radial
- Operating DC Voltage: 1800
from Littelfuse, Inc.
The UltraMOV Metal Oxide Varistor Series is designed for applications reqiring high peak surge current ratings and high energy absorption capability. UltraMOV varistors are primarily intended for use in AC Line Voltage applications such as Transient Voltage Surge Suppressors (TVSS), Uninterruptable... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 226
- Lead Style: Radial
- Operating AC Voltage: 130
from Utmel Electronic Limited
VARISTOR 120V 2.5KA DISC 10MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40
from Littelfuse, Inc.
The UltraMOV Metal Oxide Varistor Series is designed for applications reqiring high peak surge current ratings and high energy absorption capability. UltraMOV varistors are primarily intended for use in AC Line Voltage applications such as Transient Voltage Surge Suppressors (TVSS), Uninterruptable... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 787
- Lead Style: Radial
- Operating AC Voltage: 440
from Utmel Electronic Limited
VARISTOR 180V 4.5KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 14
- Lead Style: Radial
- Temperature Coefficient: 0.05 ppm/°C
from Littelfuse, Inc.
The RA Series transient surge suppressors are varistors (MOVs) supplied in a low-profile box that features a precise seating plane to increase mechanical stability for secure circuit-board mounting. This feature makes these devices suitable for industrial applications critical to vibration. Their... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 110
- Lead Style: Radial
- Operating AC Voltage: 60
from Utmel Electronic Limited
VARISTOR 18V 250A DISC 7MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 7
- Lead Style: Radial
- Temperature Coefficient: 0.05 ppm/°C
from Littelfuse, Inc.
The ZA Series of transient voltage surge suppressors are radial-lead varistors (MOVs) designed for use in the protection of low and medium-voltage circuits and systems. Typical applications include motor control, telecom, automotive systems, solenoid, and power supply circuits to protect circuit... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 110
- Lead Style: Radial
- Operating AC Voltage: 60
from Utmel Electronic Limited
VARISTOR 22V 1KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 14
- Lead Style: Radial
- Temperature Coefficient: 0.05 ppm/°C
from Littelfuse, Inc.
The M3 Varistor Series is a compact MOV with high surge current withstanding and energy absorption capabilities. It is designed to meet the 6 kV/3 kA (1.2/50 μs, 8/20 μs) combination wave surge as required by Annex G of IEC 62368-1, and 3 kA (E130~E420), 2 kA (E440~E625), Nominal Discharge... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 226
- Lead Style: Radial
- Operating AC Voltage: 130
from Utmel Electronic Limited
VARISTOR 22V 3KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Operating DC Voltage: 22
from Littelfuse, Inc.
TMOV and iTMOV Varistor SeriesThe Littelfuse TMOV and iTMOV thermally protected varistors represent a new development in integrated circuit protection. Both versions are comprised of radial leaded MOVs (Metal Oxide Varistors) with an integrated thermally activated element designed to open in the... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 198
- Lead Style: Radial
- Operating AC Voltage: 115
from Utmel Electronic Limited
VARISTOR 240V 1.2KA DISC 7MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 7
- Lead Style: Radial
- Temperature Coefficient: 0.05 ppm/°C
from Littelfuse, Inc.
Radial Leaded Varistor [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 226
- Lead Style: Radial
- Operating AC Voltage: 130
from Utmel Electronic Limited
VARISTOR 270V 100A SOD83A AXIAL [See More]
- Mounting Option: Through Hole; Other
- Diameter: 3
- Lead Style: Radial; Axial
- Operating DC Voltage: 270
from Littelfuse, Inc.
The Littelfuse LV UltraMOV ™ Series of low voltage, high surge current, radial leaded varistors provides an ideal circuit protection solution for lower DC voltage applications by offering higher surge ratings than ever before available in such small discs. The maximum peak surge current rating... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 16.2
- Lead Style: Radial
- Operating AC Voltage: 11
from Utmel Electronic Limited
VARISTOR 33V 2KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Temperature Coefficient: 0.05 ppm/°C
from Littelfuse, Inc.
The Littelfuse LV UltraMOV ™ Series of low voltage, high surge current, radial leaded varistors provides an ideal circuit protection solution for lower DC voltage applications by offering higher surge ratings than ever before available in such small discs. The maximum peak surge current rating... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 90.2
- Lead Style: Radial
- Operating AC Voltage: 50
from Utmel Electronic Limited
VARISTOR 360V 4.5KA DISC 11.5MM [See More]
- Mounting Option: Through Hole; Other
- Operating AC Voltage: 230
- Operating DC Voltage: 360
- Operating Temperature: -40
from Littelfuse, Inc.
The AUMOV ® Series Varistor offers 50% greater surge withstanding capability than existing technologies on the market for low DC voltage applications. The maximum peak surge current is rated up to 5KA (8/20 μs pulse) to protect sensitive automotive systems from voltage transients induced... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 24.2
- Lead Style: Radial
- Operating AC Voltage: 14
from Utmel Electronic Limited
VARISTOR 390V 2.5KA DISC 10MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 10
- Lead Style: Radial
- Operating DC Voltage: 390
from Littelfuse, Inc.
The AUMOV ® Series Varistor offers 50% greater surge withstanding capability than existing technologies on the market for low DC voltage applications. The maximum peak surge current is rated up to 5KA (8/20 μs pulse) to protect sensitive automotive systems from voltage transients induced... [See More]
- Mounting Option: Through Hole
- Operating DC Voltage: 73.8
- Lead Style: Radial
- Operating AC Voltage: 50
from Utmel Electronic Limited
VARISTOR 390V 6.5KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Operating DC Voltage: 429
- Diameter: 14
- Operating AC Voltage: 250
from Utmel Electronic Limited
VARISTOR 470V 1.2KA DISC 7MM [See More]
- Mounting Option: Through Hole; Other
- Operating AC Voltage: 300
- Operating DC Voltage: 470
- Operating Temperature: -67
from Utmel Electronic Limited
VARISTOR 470V 1.2KA DISC 9MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 9
- Lead Style: Radial
- Operating DC Voltage: 470
from Utmel Electronic Limited
VARISTOR 470V 6KA DISC 14MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40
from Utmel Electronic Limited
VARISTOR 470V 800A DISC 5MM [See More]
- Mounting Option: Through Hole; Other
- Operating Temperature: -40
from Utmel Electronic Limited
VARISTOR 47V 3KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Operating DC Voltage: 47
from Utmel Electronic Limited
VARISTOR 510V 10KA DISC 20MM [See More]
- Mounting Option: Through Hole; Other
- Diameter: 20
- Lead Style: Radial
- Operating DC Voltage: 459