From automotive SMD and leaded style varistors to a variety of low and medium voltage varistors, Bourns offers industry-leading solutions to protect your products from destructive transient voltage. Learn more about the six types of varistors Bourns offers and find the right level of protection for your design.
Bourns, after acquiring Keko Varicon company in 2019, is a leading manufacturer partner of overvoltage protection, including varistor and EMI suppression products. Their industry-leading overvoltage and overcurrent protection portfolio offers a broad variety of solutions for low voltage board level (LVBL), telecommunication, automotive grade electronics, AC-line, TVSS and high-energy industrial equipment applications.
AUTOMOTIVE GRADE SMD VARISTORS - AV SERIES
| Almost all electronic systems in an automobile, e.g. anti-lock brake system, direct ignition system, airbag control system, wiper motors, etc. are susceptible to damage from destructive voltage transients. AV series varistors are transient suppressors with temperature independent suppression characteristics enabling protection from -55 °C to 125 °C. AV series varistors, offering excellent transient energy distribution. AV series varistors require significantly less space and pad area as they offer greater circuit board layout flexibility than silicon TVS diodes. |  |
AUTOMOTIVE GRADE LEADED STYLE VARISTORS – AV TH SERIES
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The AV series of leaded automotive grade varistors includes multilayer TH varistors. Automotive grade varistors are intended for WLD applications typically requiring up to 50 J of energy, and disc automotive grade varistors for WLD applications requiring more than 50 J of energy. Automotive grade varistors offer excellent transient energy absorption due to improved internal energy distribution. Compared to equivalent disc automotive grade varistors they offer better electrical characteristics realized in a much smaller size. |
LOW VOLTAGE SMD VARISTORS - ZV SERIES
| The ZV series of low voltage varistors is designed to protect sensitive electronic devices against high voltage surges in the low voltage region. They offer excellent transient energy absorption due to improved energy volume distribution and power dissipation. Low voltage varistors cover a wide DC operating voltage range from 3 V to 170 V. ZV series varistors are typically applied to protect integrated circuits and other components at the circuit board level. |  |
Applications
• Suppression of inductive switching or other transient events such as surge voltage at the circuit board level
• ESD protection for components sensitive to IEC 1000-4-2, MIL-STD 883C Method 3015.7 and other industry specifications
• Replace larger surface mount TVS Zeners in many applications
• Used to achieve electromagnetic compliance of end products
• Provides on-board transient voltage protection of ICs and transistors
LOW VOLTAGE LEADED STYLE VARISTORS – ZV TH SERIES
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The ZV series of low voltage varistors is designed to protect sensitive electronic devices against high voltage and current surges in the low voltage region. They offer excellent transient energy absorption due to improved energy volume distribution and power dissipation. Low voltage varistors cover a wide DC operating voltage range from 3 V to 56 V. |
Applications
• Suppression of inductive switching or other transient events such as surge voltage at the circuit board level
• Provides on-board transient voltage protection for ICs and transistors
• Helps to achieve electromagnetic compliance of end products
• Replaces larger TVS Zener diodes in many applications
LOW & MEDIUM VOLTAGE PLASTICS-ENCAPSULATED VARISTORS - PV SERIES
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The PV series of low & medium voltage plastic-encapsulated varistors is designed to protect electronic equipment against high voltage surges in the low & medium voltage region. They offer direct SMD equivalents to leaded disc varistors of 5- and 7-mm sizes. The thermoplastic encapsulation is non-flammable according to the standard UL 94 V-0. Contacts are made of tinned copper sheet. PV series varistors are designed for surface mounting and are available in two model sizes. These transient voltage suppressors cover an operating voltage Vrms from 11 V to 300 V, featuring maximum surge currents from 100 A to 1200 A. |
MEDIUM VOLTAGE VARISTORS – DV SERIES
| The DV series of medium voltage varistors is designed to protect electronic equipment against high voltage surges in the medium voltage region. This series offers excellent transient energy absorption due to improved energy volume distribution and power dissipation. Compared to other medium voltage SMD varistors, DV series varistors have a very low profile. |  |
DV series varistors are designed for surface mounting and are available in two model sizes: 3225 and 4032 (the 2220 size is also available upon request). These transient voltage suppressors cover an operating voltage Vrms from 11 to 300 V, featuring maximum surge currents from 100 A to 1200 A.
| Series | Description | Product Photo | Technology & Package | Sizes (mm) or Package | Max Continuous Voltage (Vrms) | Max Continuous Voltage (Vdc) | Peak Single Pulse Current 8/20 µs (Imax) | Temperature Rating °C | Agency Listing |
|---|---|---|---|---|---|---|---|---|---|
| AV TH | Automotive grade through-hole multilayer |  |
MLV Leaded | 602, 802, 902, 1103 |
14-40 V | 16-56 V | 400-2000 A | -55 to +125 | AEC-Q200 Grade 1 |
| AV-SMD | Automotive grade varistors |  |
SMD | 0805, 1206, 1812, 2220, 3225 | 14-40 V | 16-56 V | 200-1200 A | -55 to +125 | AEC-Q200 Grade 1 |
| AV HT-SMD | Automotive grade varistors high temperature rated |  |
SMD | 0805, 1206, 1812, 2220, 3225 | 14-0 V | 16-56 V | 200-2000 A | -55 to +150 | AEC-Q200 Grade 1 |
| DV | Low & medium voltage varistors |  |
MOV SMD | 2220, 3225, 4032 | 11-300 V | 14-385 V | 100-1200 A | -55 to +125 | UL 1449 |
| PV | Low & medium encapsulated varistors |  |
MOV SMD | 3225, 4032 | 60-300 V* | 85-385 V* | 100-1200 A | -40 to +85 | UL 1449 |
| ZV | Low voltage varistors |  |
MLV SMD | 0603, 0805, 1206, 1210, 1812, 2220 | 11-130 V* | 14-170 V* | 30-1200 A | -55 to +125 | N/A |
| ZV HT | High temperature low voltage varistors |  |
MLV SMD | 0603, 0805, 1206, 1210, 1812, 2220 | 11-130 V* | 14-170 V* | 30-1200 A | -55 to +150 | N/A |
| ZV TH | Low voltage leaded style varistors |  |
MLV Leaded | 5, 7, 10, 14, 20 |
11-40 V | 14-56 V | 100-2000 A | -55 to +125 | UL 1449 |
*Lower voltage available upon request
TARGET APPLICATIONS
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