Dual Function Varistors

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            Dual Function Varistors
                    KEMET offers seven series of single-ended/radial and surface-mount, conductive polymer, aluminum, solid electrolytic capacitors
    

Image of KEMET 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 V_DC 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 V_DC 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 (V_RMS) 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 V_DC 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 V_DC 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 V_RMS 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 V_DC Operating voltage (V_RMS) 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 V_DC Operating voltage range (V_RMS) 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 V_DC 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