Vishay tailors capacitors for medical applications

Vishay Intertechnology Inc. launched a new series of non-magnetic surface-mount multilayer ceramic chip capacitors (MLCCs) for MRI diagnostic equipment. VJ series non-magnetic capacitors are available with both C0G (NPO) and X7R/X5R dielectrics, each with a wide range of case sizes, voltage ratings, and capacitance values.

Recent technology advances in the area of ultra-high-field MRI can now produce much higher imaging resolution. Electronic components used in the MRI equipment or nearby require non-magnetic components that do not interfere with magnetic fields. To meet this need, Vishay's VJ series MLCCs are manufactured with non-magnetic materials and are 100 % safety-screened for magnetic properties before final packaging. 

Vishay's VJ series devices feature a wet build process and a reliable Noble Metal Electrode (NME) system. This new non-magnetic series of capacitors can be assembled in an SMT process using conductive epoxy bonding or IR reflow. The capacitors are proven to have less interference than standard capacitors, which contain magnetic materials. The devices will typically be used in filter circuits for MRI equipment, implantable medical devices, ferromagnetic-sensitive instrumentation, electronic test systems, and high-end audio amplifiers. 

Key highlights:

• Offered in 11 case sizes from 0402 to 3640,
• High voltage ranges from 6.3 VDC to 3000 VDC
• Wide capacitance range of 0.5 pF to 56 nF (with C0G dielectric) and 100 pF to 6.8 μF (with X7R/X5R dielectric)
• Operating temperature range of - 55 °C to + 125 °C
• TCC of ± 30 ppm/°C from - 55 °C to + 125 °C (C0G), ± 15 % from - 55 °C to + 85 °C (X5R), and ± 15 % from - 55 °C to + 125 °C (X7R)
• Compliant to RoHS Directive 2002/95/EC
• Halogen-free according to the IEC 61249-2-21 definition

Pricing: For U.S. delivery varies by capacitance, voltage, and case size, but it is in the range of $0.10 per piece for low-capacitance 0402 C0G products.

Availability: Samples and production quantities are available now, with lead times of nine to 14 weeks for standard orders.

Datasheet: Click here.