Passive Components > Ceramic & Cement Resistors
HTR Ceramic Resistors Overview
Construction and Materials: HTR Ceramic resistors are wirewound resistors designed for high power applications. They consist of a resistance wire wound around an alkali-free ceramic core, encased in a protective layer made from heat-resistant, moisture-resistant, and non-corrosive materials. This assembly is then housed in a square ceramic package sealed with special non-flammable and heat-resistant cement. The external casing is primarily ceramic, providing durability and flame resistance.
Cement-coated Resistors
HTR’s cement-coated wirewound resistor features a high-quality ceramic substrate with interference fit end caps, to which termination wires are welded. The resistive element is wound around the ceramic substrate and also welded to the caps. A cement coating is applied to the resistor body for protection, followed by marking with indelible ink.
Features:
- Cost-effective
- Flameproof protection
- Suitable replacement for carbon composition resistors in many applications
- Ideal for pulse handling applications
Characteristics and Applications: Ceramic resistors are known for their compact size, shock resistance, moisture resistance, and excellent heat dissipation properties. They are cost-effective and widely used in various applications, including power adapters, audio equipment, audio crossovers, instruments, meters, televisions, and automobiles.
Ceramic resistors are also categorized as wirewound/metal oxide, commercial power, non-inductive, axial lead resistors. They feature a high power rating, non-inductive construction, excellent pulse load capability, and a flameproof ceramic case.
What is a Ceramic Resistor?
A Ceramic resistor is a type of power resistor that is designed to handle large amounts of power without being damaged by heat or flames. This makes them an ideal choice for circuits that require resistance to high temperatures and flames.
Ceramic Resistors vs. Other Types of Resistors: A Comparison
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Ceramic Resistors:
- Made with a resistance wire wound, coated with a Ceramic or ceramic compound.
- Known for high power handling capabilities, stability, and heat dissipation.
- Commonly used in power electronics and industrial equipment.
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Carbon Composition Resistors:
- Made by mixing carbon particles with a binder and molding them into shape.
- Lower power ratings and less accurate compared to Ceramic resistors.
- Suitable for low-power applications and circuits requiring low precision.
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Film Resistors:
- Made by depositing a thin resistive layer on an insulating substrate.
- Offer good accuracy, stability, and a wide range of resistance values.
- Preferred for applications requiring precision, such as audio systems and telecommunications.
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Wirewound Resistors:
- Similar to Ceramic resistors but may use different core materials and wire alloys.
- Offer high precision, low temperature coefficients, and excellent stability.
- Suitable for high accuracy and stability applications.
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Thick Film Resistors:
- Made by screen-printing a resistive paste onto a ceramic substrate and firing it.
- Cost-effective, with a wide range of resistance values and good stability.
- Common in consumer electronics and automotive applications.
Summary: Ceramic resistors excel in high-power applications that require stability, durability, and effective heat dissipation. While they offer superior power handling and heat dissipation compared to other resistor types, the choice of resistor depends on the specific requirements of the circuit, including power rating, precision, temperature coefficients, and cost.
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