Dual Function Varistors


KEMET's SMD and through-hole dual function varistors protect circuits from high energy discharges. The dual-function VM and VK series, which integrate a capacitor to suppress interference from devices such as DC electric motors, are ideal for protecting sensitive automotive electronics against electric-motor noise as well as potentially damaging, high-energy transients. The surface-mount VA series is also targeted at automotive applications. The plastic-encapsulated VP series have superior humidity resistance for use in medical instruments and equipment such as outdoor, mobile-communications infrastructures and professional or consumer white goods. The VC and high-temperature (up to 150°C) VE series are ideal for the suppression of inductive switching and other transient events.

The VG series has a capacitance of less than 400 pF and is ideal for protecting high-speed I/O lines. The through-hole, dual-function VM and VK series, and the surface-mount VA, VC, VE, and VG varistors are AEC-Q200 qualified.

VA Series Surface-Mount Varistors

KEMET's VA series of varistors are transient suppressors with temperature-independent suppression characteristics, enabling protection from -55 °C to +25 °C. VA varistors offer excellent transient energy distribution and require significantly less space and pad area than silicon TVS diodes, offering greater circuit-board layout flexibility for the designer.

Benefits
  • Surface mount form factor
  • Operating ambient temperature of -55°C to 125°C
  • Supply voltage 12 V, 24, and 42 V
  • Operating voltage range of 16 to 56 VDC
  • Available case sizes: 0805, 1206, 1210, 1812, 2220
  • Near zero inductance for the fastest speed of response to transient surges
  • Broad range of current and energy handling capabilities
  • Low clamping voltage – Uc
  • Non-plastic coating guarantees improved flammability rating
  • Non-sensitive to mildly activated fluxes
  • Barrier type end terminations solderable with Pb-free solders according to JEDEC J-STD-020C and IEC 60068-2-58
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

VC Series Surface-Mount Varistors

KEMET's VC series of low-voltage varistors are designed to protect sensitive electronic devices against high-voltage surges in the low-voltage region. VC varistors offer excellent transient energy absorption due to improved energy volume distribution and power dissipation.

Benefits
  • Surface mount form factor
  • Operating ambient temperature of -55°C to 125°C
  • Operating voltage range of 3 to 170 VDC
  • Available case sizes: 0603, 0805, 1206, 1210, 1812, 2220
  • Short response time
  • Broad range of current and energy handling capabilities
  • Low clamping voltage – Uc
  • Non-sensitive to mildly activated fluxes
  • Barrier type and terminations solderable with Pb-free solders according to JEDEC J-STD-020C and IEC 60068-2-58
  • UL 1499, 3rd edition & CSA C22.2 File E326499 Section 8
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

VE Series Surface-Mount Varistors

KEMET's VE series of high-temperature, low-voltage varistors are designed to protect sensitive electronic devices against high-voltage surges in the low-voltage region. In addition to superior operating performance at rated 150°C (AEC-Q200 compliance), they offer excellent transient energy absorption due to improved energy volume distribution and power dissipation.

Benefits
  • Surface mount form factor
  • Operating ambient temperature of -55°C to 150°C
  • Superior operating performance rated at 150°C (AEC-Q200 compliance)
  • Operating voltage range of 3 V to 170 V
  • AC voltage range (VRMS) of 2 V to 130 V
  • High resistance to cyclic temperature stress
  • Low leakage currents after 1,000 hours rated at 150°C
  • High energy absorption capability
  • Available case sizes: 0603, 0805, 1206, 1210, 1812, 2220
  • Short response time
  • Broad range of current and energy handling capabilities
  • Low clamping voltage – Uc
  • Non-sensitive to mildly activated fluxes
  • Barrier type end terminations solderable with Pb-free solders according to JEDEC J-STD-020C and IEC 60068-2-58
  • UL 1499, 3rd edition & CSA C22.2 File E326499 Section 8
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

VG Series Surface-Mount Varistors

KEMET's VG series of varistors are designed to suppress ESD events, including those specified in IEC 1000-4-2 or other standards used for electromagnetic compliance testing. VG varistors are typically applied to protect integrated circuits and other components at the circuit-board level, operating at 18 VDC or less. The manufacturing method, design, and materials of these devices result in capacitance characteristics suitable for high-frequency attenuation/low-pass filter circuit functions, providing suppression and filtering in a single device.

Benefits
  • Surface mount form factor
  • Operating ambient temperature of -55°C to 125°C
  • Operating voltage range of up to 18 VDC
  • Available cases sizes: 0603, 0805, 1206, 1210
  • Short response time
  • Characterized for inductance and capacitance
  • Dimensional and weight savings on the board
  • Non-sensitive to mildly activated fluxes
  • Barrier type end terminations solderable with Pb-free solders according to JEDEC J-STD-020C and IEC60068-2-58
  • Non-plastic coating guarantees improved flammability rating
  • Available in tape and reel for automatic pick and place
  • UL 1499, 3rd edition & CSA C22.2 File E326499 Section 8
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

VP Series Surface-Mount Varistors

KEMET's VP series of low- and medium-voltage, plastic-encapsulated varistors are designed to protect electronic equipment against high-voltage surges in the low- and medium-voltage region. They offer direct, surface-mount 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 a tinned copper sheet. These transient voltage suppressors cover an operating voltage VRMS from 11 V to 300 V, featuring maximum surge currents from 100 A to 1,200 A.

Benefits
  • Surface mount form factor
  • Operating ambient temperature of -40°C to 85°C
  • Operating voltage range of 14 to 385 VDC
  • Operating voltage (VRMS) of 11 V to 300 V
  • Available case sizes: 3255 and 4032
  • Dimensional and weight savings on the board
  • Non-flammable thermoplastic encapsulation according to the standard UL 94 V-0
  • UL 1449, 3rd edition & CSA C22.2. File E326499 Section 3
  • RoHS 2 2011/65/EC, REACH compliant

VK Series Leaded Varistors

KEMET's VK series of dual-function, protective devices protect against voltage surges in a low-voltage region and against high-frequency noise, replacing two components: a low-voltage varistor and a capacitor. KEMET's VK series incorporates a varistor function in the DC voltage range from 3 to 125 V (up to 170 V upon request) and function as high-frequency, by-pass capacitors operating in the capacitance range from 10 nF to 1 µF. Lower capacitance values are also available. They are intended for protection of all sensitive electronic devices experiencing both voltage transients and high-frequency noise produced by electromechanical devices such as buzzers, relays, and other devices.

Benefits
  • Through-hole form factor
  • Operating ambient temperature of -40°C to 125°C
  • Operating voltage range of 3 to 125 VDC
  • Operating voltage range (VRMS) 2 V to 95 V
  • Capacitance range at 1 kHz of 10 nF to 1 μF
  • Capacitor temperature characteristics X7R
  • Dimensional and weight savings on the board
  • One standard model size available, 6 x 9 mm
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

VM Series Leaded Varistors

KEMET's VM series of dual-function protective devices protect against voltage surges in an automotive voltage region and against radio frequency noise. This component replaces two components: a low-voltage varistor and a capacitor. KEMET's VM series incorporates a varistor function in automotive applications in a voltage region of 12 V, 24 V, and 42 V and a function of a radio-frequency filtering capacitor in a high capacitance range from 0.47 to 1.5 µF, making them ideal for protection in automobile electronic applications.

Benefits
  • Through-hole form factor
  • Operating ambient temperature of -40°C to 125°C
  • Supply voltage of 12 V, 24 V, and 42 V
  • Operating voltage of 16 to 56 VDC
  • Capacitance range at 1 kHz of 0.47 to 1.5 μF
  • X7R capacitor temperature characteristics
  • Dimensional and weight savings on the board
  • RoHS 2 2011/65/EC, REACH compliant
  • AEC-Q200 qualified Grade 1

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