Vitrohm Ceramic Encased Wirewound Resistors
Quick Overview
Vitrohm Ceramic Encased Wirewound Resistors
Ceramic-encased, flame-proof resistors serve a dual purpose as wirewound resistors and fuses, simplifying the design of circuits requiring built-in thermal protection. A wirewound resistor, a type of electrical passive component, regulates current flow. It comprises an insulated metallic wire wound around a non-conductive core. Typically made from high-resistivity materials like nickel-chromium (Nichrome) or the copper-nickel-manganese alloy Manganin, the wire is wound around core materials such as ceramic, plastic, or glass. Wirewound resistors, the oldest type still in production, offer precise manufacturing, excellent properties for low resistance values, and high power ratings.
Details
These Vitrohm resistors are ceramic housed low-inductive resistors with ceramic rod wirewound core and are almost universally used in the far east for almost all radio, TV and industrial equipment applications. Vitrohm Ceramic Encased Wirewound Resistors series enjoys the following distinct advantages over normal coated resistors:
1. As the resistive element is hermetically sealed in a ceramic case using a cement which enjoys flame retardant properties even at high overload, no damage can be caused to neighbouring components.
2. Due to very high degree of insulation and low surface temperature, these resistors can be mounted with their bodies relatively closer to the PCB.
3. These resistors are also commonly referred to in the far east as cement resistors owing to the nature of their construction.
4. In certain markets, these resistors are also wrongly called fusible resistors.
Note:
Due to recent technological advances, the ceramic cases used may be steatite ceramic or corderite ceramic or high alumina ceramic depending on the nature of the application. Hence the ceramic cases may be off-white or variations of brown and variations of grey; colours which are inherent to these ceramic materials.
Vitrohm Resistor offers commercial grade ceramic case power wirewound and film resistors. For medium to high rated power (2W-60W), Vitrohm provides full electrical insulation mounted in a ceramic case.The ceramic construction is fireproof and resistant to moisture & solvents. The internal element is wirewound on lower values, power film on higher values. Vitrohm ceramic wirewound resistors feature ideal specifications for high volume and high-temperature applications. Frequently used in power supplies, motor controllers, and automotive applications, these products can be custom tailored to individual needs. With the extended resistance range and high-temperature rating, the resistors can be specified for operation in harsh.
A wirewound resistor is an electrical passive component that limits current flow on an electrical circuit.
As the name indicates, wirewound resistors consist of a resistive wire, with different alloys, wounded around an insulating substrate, to achieve the desired ohmic value, and can be finished with a protective coating, ceramic case or moulding.
For a wirewound to be used on the end application, the resistive wire has to be connected to the terminal leads.
The first and therefore the oldest resistor technology initially used only for precision and power applications, is nowadays used in several applications. The application requirements determines the selection of winding, contacting method and partly also the type of finishing. Wirewound resistors are distributed into some major categories according to their mains characteristics and application.
Vitrohm ceramic housed Resistors Features:
- Space saving
- Direct mounting on printed circuit board
- High power to size ratio
- Special cement potting compound and ceramic case provide high thermal conductivity in a fireproof package
Safety Wirewound Resistors
Coated through hole wirewound resistors, coated with the flame retardant coating, that ensure safe and silent fusing operation in overload conditions.
A compact moulded SMD version and a SMD Z version are also available.
Through hole safety wirewound resistor
SMD safety wirewound resistor
Precision Wirewound Resistors
Coated through hole wirewound resistors specially used when high accuracy is needed with a narrow tolerance. A precise resistive wire alloy is used to guarantee the resistor precision during application.
A compact moulded SMD version and a SMD Z version are also available.
Through hole precision wirewound resistor
SMD precision wirewound resistors
Pulse Wirewound Resistors
Coated through hole wirewound resistors with special construction to be able to withstand short duration impulse events, up to rated limits. The pulse-capability can be customized according to application.
A compact moulded SMD version and a SMD Z version are also available.
Through hole pulse wirewound resistor
SMD pulse wirewound resistor
Fusible Wirewound Resistors
Moulded and Ceramic case through hole wirewound resistors that have characteristics of fusing without flames or without excess heat generation when the current load jumps suddenly more than required.
A compact moulded SMD version is also available.
Through hole fusible wirewound resistors
SMD fusible wirewound resistor
General Purpose Wirewound Resistors
Coated and moulded through hole wirewound resistors that can be used in various devices and circuits suitable for general applications. Resistors used in circuits with a low cost, a good performance and high component reliability.
A compact moulded SMD version is also available.
Through hole general purpose wirewound resistors
SMD general purpose wirewound resistor
Power Wirewound Resistors
Ceramic Case and Aluminum House wirewound resistors designed to withstand and dissipate large amounts of power.
Power wirewound resistors