Customized resistors

Customized Resistors are electrical components that are developed and manufactured exactly according to the requirements of a specific application. In contrast to standard resistors, which are produced in fixed tolerance and value ranges, customer-specific variants offer maximum flexibility in terms of resistance value, temperature coefficient (TCR), power rating, design, connection type and environmental resistance. They are usually used when commercially available solutions are not sufficient in terms of precision, stability or long-term behavior. VPG's bulk metal foil technology, for example, enables extremely low TCR values and excellent long-term stability, which are essential for high-precision measurement and control technology or safety-critical systems. Such special solutions are used particularly in aviation, medical technology, automation and high-frequency technology. Close cooperation between developers, distributor Rotima AG and manufacturer VPG Foil Resistors results in precisely matched components for individual application scenarios.

The use of customized resistors is always worthwhile when maximum accuracy, thermal stability and long-term reliability are required. In the development of devices with safety-critical or standardized requirements - such as in medical technology, aerospace, industrial measurement technology or high-voltage supply - standard solutions are often not sufficient. As soon as individual resistance values, special tolerance classes or special housing shapes are required, a customized resistor offers decisive advantages. Even when external influences such as humidity, vibrations or temperature changes can affect stability, customer-specific, often hermetically sealed solutions come into play. The VPG Foil Resistors are characterized by minimal TCR and high load capacity - this guarantees precise function even over many years. If you rely on components that fit the system architecture exactly, you minimize subsequent failures and increase the overall quality of electronics development.

Bei kundenspezifischen Widerständen lassen sich zahlreiche technische Parameter individuell festlegen. Dazu zählen insbesondere der Widerstandswert (z. B. 1 Ω bis 3,3 MΩ), die Toleranz (bis zu ±0,001 %), der Temperaturkoeffizient (TCR) (nahezu null), sowie der Leistungskoeffizient (PCR). Ebenso können Gehäuseformate, Anschlussarten (z. B. 2- oder 4-Leiter, Kelvin-Anschluss), thermische Eigenschaften und die ESD-Festigkeit anwendungsspezifisch konfiguriert werden. Auch das Verhalten bei Langzeitbelastung (Load-Life Stability) spielt eine Rolle – bei VPG liegen die Werte hier bei bis zu ±0,005 % über 2000 Stunden. Für raue Umgebungen sind hermetisch versiegelte Varianten mit Öl- oder Gummi-Füllung verfügbar. Die Integration in komplexe Schaltpläne wird durch Hybridlösungen mit Goldbonding vereinfacht. Kunden können dabei meist ohne Mindestbestellmenge und Engineering-Kosten ihre Anforderungen spezifizieren und erhalten ein vollständig passendes Produkt für ihre Anwendung.

For industrial applications, Rotima AG, among others, offers customized resistors in close cooperation with the leading manufacturer VPG Foil Resistors. As a distributor with a technical focus, Rotima supports customers from a wide range of industries - from energy technology and the process industry to medical technology - in the selection and configuration of the right resistor solution. VPG contributes decades of experience in the development of high-precision film resistors and offers the currently leading platform for maximum resistor stability with bulk metal foil technology. Customized designs are available at short notice in prototype quantities and can be adapted directly to the requirements of industrial production environments. Customers benefit from comprehensive technical advice, precise documentation, NIST certification and permanently stable delivery quality. This means that even the most demanding applications can be realized precisely and efficiently.

Hermetically sealed customized resistors offer maximum safety against environmental influences such as moisture, gas ingress and temperature fluctuations. These resistors are completely encapsulated, often with oil or rubber filling or in a glass-to-metal housing to prevent the ingress of oxygen or water. As a result, the electrical properties remain constant over many years - a decisive advantage in critical applications such as aerospace, defense, laboratory technology or medical devices. The hermetically sealed models developed by VPG Foil Resistors have a leakage rate of less than 1x10-⁷ cc/s and therefore achieve exceptionally stable long-term behavior. Especially at low current flow, even minimal moisture can lead to resistance changes in conventional resistors - but not in hermetically sealed solutions. This means: no electrolyte formation, no material degradation, no functional failures - even under continuous load. This makes them the ideal choice for precision electronics with extreme requirements.