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Les Résistances d’Exxelia Ohmcraft permettent d’accélérer les tests de dépistage du COVID-19

Les entreprises de dispositifs médicaux et de diagnostique font appel à Exxelia Ohmcraft, leader dans la conception et la fabrication de résistances à couches épaisses, haute tension et haute précision, pour produire des résistances sur mesures répondant à des spécifications strictes.

En pleine pandémie mondiale du nouveau coronavirus (COVID-19), les experts ont déclaré qu’une pratique extensive de tests était essentielle pour endiguer la propagation du virus et renouer avec l’activité notamment dans les villes.

Les entreprises de dispositifs médicaux et de diagnostics ont travaillé sans relâche pour développer des solutions de test rapides et fiables. Pour rendre ces kits de test possibles, les fabricants se sont tournés vers Exxelia Ohmcraft, un leader dans la conception et la fabrication de résistances à couches épaisses, haute tension et haute précision.  

Les nouvelles solutions de test rapide impliquent le traitement des échantillons des patients à l'aide d'un thermocycleur, un instrument utilisé pour amplifier l'ADN et l'ARN afin d’identifier le COVID-19. Pour fonctionner, les thermocycleurs utilisent des résistances de montage en surface à haute valeur ohmique et à faible bruit d'Exxelia Ohmcraft. Ces résistances répondent à des spécifications strictes, notamment en terme d’encombrement pour permettre aux appareils de test d'être portatifs.  

«En raison de la crise actuelle, le client a fait en sorte que ces kits de test soient développés, produits et entre les mains du plus grand nombre d’acteurs du système de santé possible en un temps record. En tant que fabricant américain avec des délais de fabrication imbattable, Exxelia Ohmcraft a pu fournir des résistances sur mesures essentielles à leur mission », a déclaré Eric Van Wormer, Vice-Président d'Exxelia Ohmcraft.

«Nous sommes fiers de nous associer à des entreprises engagées dans la lutte contre COVID-19.» La technologie d'Exxelia Ohmcraft utilise le système d'impression électronique unique Micropen pour «imprimer» des lignes serpentines précises et étroites avec de l'encre résistive sur un substrat en céramique, produisant des résistances plus performantes sur une plage de valeurs plus large sur une surface plus petite que ce qui est possible avec une résistance à film de technologie conventionnelle.

Published on 27 May 2020 by Stephane PERES

Innovative new products at Electronica - Booth# B5 312 -

Felsic HV, long lifetime and high voltage screw terminal The Felsic HV family of aluminum electrolytic screw terminal capacitors provides great performances in energy density and ultra-long lifetime. For example products can withstand 8 000 hours at 105°C under high values of current which makes them the perfect choice to overcome railway constraints. The family also has one of the lowest ESR for aluminum capacitors, less than 10m0hms in most cases. Products are available for voltages from 160 to 450 Vdc, and offer capacitance values from 1500μF up to 47 000μF. Thus the family is a good compromise between reliability and compacity, with for example 47 000μF @ 160V in a 90x200mm volume. Cost-effective common-mode chokes qualified for aerospace Designed and qualified for aerospace, the TCM series is available in a through-hole package for horizontal and vertical mounting. TCM common-mode chokes are offered with inductances from 0.7 to 47mH under rated currents from 0.3A to 4A, and thoroughly tested by a dielectric withstanding strength at 1500VAC. Their excellent thermal properties allow the TCMs to operate without a hitch from -55°C up to +125°C, which, combined to the high mechanical resistance of the chosen materials (all meeting to UL94 V0 rating) make those products the perfect fit for aviation, defense and transportation industries. Ceramic capacitors based on the new C48X dielectric New range of high voltage ceramic capacitors based on brand new dielectric material C48X, combining most advantages of NPO and X7R dielectrics. Compared to X7R material, C48X dielectric allows to get the same capacitance values under working voltage with the unrivaled advantage of a very low dissipation factor (less than 5.10-4). Besides, it can also withstand very high dV/dt, up to 10kV/μs, which makes it the solution of choice for pulse and fast charge/discharge applications or firing units. Thus capacitors with C48X dielectric appear to be ideally suited for power applications where heat dissipation may be detrimental to performances and reliability. Ultra low ESR, high RF power and high self-resonant frequency The new NHB series is a complete range of MLCC based on NPO dielectric material providing a very high Self Resonant Frequency and limiting the parasite Parallel Resonant Frequencies. The series is available in 1111 size with capacitance ranging from 0.3pF to 100pF. NHB series offers excellent performance for RF power applications at high temperature up to 175°C and at 500 VDC. The lowest ESR is obtained by combining highly conductive metal electrodes and proprietary of new NPO low loss rugged dielectrics. NHB series particularly fits for high power and high frequency applications such as: cellular base station equipment, broadband wireless service, point to point / multipoint radios and broadcasting equipment.

Exxelia at Space Tech Expo

ESA QPL Film Capacitors PM907S and PM948S are full series of Polyester Film Capacitors. PM907S products are suitable for voltages from 50V up to 1250V and offer capacitance values from 82nF up to 180μF. PM948S can be used from 50V up to 630V with capacitance values from 22nF up to 47μF. Both series can support extreme conditions with temperatures from -55°C to +125°C, and offer high energy density, low ESR & ESL and high RMS current. Film capacitor Series PM907S and PM948S are ESA QPL certified according to the ESCC Detail Specification No. 3006/025 and 3006/026   Smallest ESA QPL Ceramic Capacitor of the Market Exxelia ranges of low voltage MLCC for surface mounting, CEC19 and CNC19, have achieved the ESA Qualified Part List status under the criteria of the European Space Component Coordination’s (ESCC) 3009/042 and 3009/043 respectively. The  0402 size QPL-qualified parts are available from 10V to 25V, enabling substantial miniaturization and cost-saving. They are available either in the very stable NPO dielectric (type 1) or the high capacitance X7R (type 2). CEC and CNC series combine high capacitance values with high thermal and voltage stability. Versions with polymer terminations are also QPL-certified.   Miniature EMI filters for space application Exxelia’s gold-plated glass-sealed EMI filters SFC030 is the solution of choice to protect several embedded power supplies and data lines.  These small and reliable filters are available up to 5A @ 200V and 22nF.  Available in a Kovar package, the better alternative to steel for enhanced temperature cycling resistance, all Exxelia’s EMI filters for space are ESA qualified according to ESCC 3008. Thanks to this extensive experience in stringent ESA testing, Exxelia is able to adapt the tests of any filter according to any need (example: SMD 20A chip, 0pF capacitor value for an arrays of filters).
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