High Temperature Capacitors

Product overview

 

High temperature capacitors use heat-resistant ceramic dielectrics, electrodes and sealing materials for circuits above the practical temperature range of standard capacitors. Applications include industrial heating equipment, high-temperature test instruments, engine electronic controls, metallurgical equipment, aerospace assemblies and high-frequency transmitters. They provide resonance, filtering and DC isolation while exposed to sustained heat or repeated thermal cycles.

Fixed and variable electrical configurations

The listed fixed model provides 500 ± 25 pF, while the variable model tunes from below 10 pF to 100 ± 5 pF. This gives a preset option for fixed circuit positions and an adjustable option for tuning or matching.

Up to 20 kV working voltage and 120 A RF current

The fixed model is rated at 20 kV high-frequency peak working voltage, 28 kV peak test voltage and 120 A at 13.56 MHz. This supports high-voltage RF operation within the documented electrical limits.

23-turn variable control with 0.2 N·m torque

The variable model distributes its capacitance range over 23 turns with 0.2 N·m maximum torque. In equipment requiring repeated tuning, this provides a defined mechanical input for manual or motorized adjustment.

The active element uses a high-temperature ceramic dielectric with heat-resistant electrodes or metallized conductive layers. Seal materials, terminal connections and external supports are selected for the intended thermal range.

Ceramic and metal connection parts are arranged to accommodate thermal expansion without placing excessive stress on the active dielectric. The final layout depends on whether the capacitor sits in the hot zone, beside a heated enclosure or on an insulated support.

Thermal and electrical operating range

The specification can define maximum operating temperature, storage temperature, capacitance, voltage and frequency. Thermal cycling and extended high-temperature operation can also be included when they reflect the actual equipment duty.

Installation in or near the heat zone

Body size, terminal length, connection direction and mounting method can position the capacitor inside or outside the highest-temperature area. Equipment drawings help confirm clearances from heat sources and nearby metal parts.

Material and assembly checks for thermal service

Ceramic parts, electrode connections, seals and terminals are checked against the approved product structure. Assembly fit is controlled so thermal expansion does not start from a stressed or misaligned condition.

Stabilization and final electrical verification

After assembly and stabilization treatment, capacitance, insulation and the applicable voltage performance are tested. The model, terminal arrangement and inspection results are tied to the shipment batch before packing.

Ceramic component development since 1966

Wanping has manufactured electro-vacuum and ceramic components since 1966. Its in-house R&D team reviews temperature together with electrical load and mechanical installation, rather than treating temperature as a stand-alone label value.

Transfer from approved sample to production

The approved sample, drawing and technical specification are used as the production reference. This keeps the ceramic body, terminal layout and heat-related construction unchanged when the item moves into repeat production.

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