Ohmite has multiple part series for high-voltage applications. Due to multiple mountings and custom specifications, Ohmite is confident customers will find the proper high-voltage resistor required to fit their needs. With the custom specifications offered and multiple mountings, Ohmite high-voltage resistors fill the need for multiple applications including power supplies, avionics, medical instruments, and industrial controls.
Thick film resistors are produced by applying a resistive film or paste, a mixture of glass and conductive materials, to a substrate. Thick film technology allows high resistance values to be printed on a cylindrical or flat substrate either covered entirely or in various patterns. They also can be printed in a serpentine design to eliminate inductance, which is preferred in applications with steady frequencies. Once applied, the resistance is adjusted using a laser or abrasive trimmer.
We offer over 20 different series in Thick Film construction. Thick Film parts can be chosen based on mounting, application, and voltage range. They are easily integrated into a heatsinkable package for high-wattage applications. High values can be obtained and high voltage can be applied to thick film products with little change in resistance value.
Transients, overloads, in-rush? Ohmite has you covered with a range of resistive products that can handle these high-energy events. From composition to unique thick film designs, Ohmite offers multiple product series that can take thousands of Joules. Axial, Radial, and Surface Mount designs are available to suit all needs and energy levels.
Construction is a nickel-chromium sputtered thin-film resistive element on alumina substrate. Wrap-around terminations with nickel barrier and tin finish are compatible with tin-lead
and lead-free soldering processes. Available in 0201 ~ 2512 component sizes, supplied on 8mm carrier tape for automatic pick and placement.
General Specifications
Applications/Functions
Low ohmic, precision current-sensing resistors. NCSR series uses temperature-stable precision conductor construction, and NCST uses low-cost thick-film construction. Supplied on tape and reel for automatic pick and placement. Precision resistance values from 0.5 milliohm (0.0005 ohm) to 1000 milliohm (1.0 ohm) are available in tolerances from +/-1% (F) ~ +/-5% (J). TCRs (resistance temperature coefficients) cover range from +/-50PPM/°C ~ +/-600PPM/°C. Industry-standard case sizes from 0402 ~ 2512 with power ratings of 0.050W (1/2W) to 3.0W. Wrap-around terminations with nickel barrier and tin finish are compatible with tin-lead and lead-free soldering processes.
Applications/Functions
Thermistor probes and assemblies are invaluable for sensing temperature in a variety of industries ranging from HVAC/R and environmental controls to automotive and white goods. Littelfuse standard and customized probes and assemblies offer very precise and extremely reliable thermal monitoring in the most demanding applications.
Littelfuse surface mount thermistors are manufactured using the most advanced equipment and technology available. Designed for measuring, controlling, and compensating for temperature with the utmost accuracy, they are available in a variety of sizes and configurations suitable for mounting using solder, wire bond, or epoxy.
Littelfuse leaded thermistor options include the highly accurate precision interchangeable thermistors, as well as high-temperature axial leaded glass encapsulated thermistors and glass-coated radial leaded chip thermistors. A wide variety of resistance values and tolerances are available.
Surface mount (SM) molded wirewounds with compliant leads to eliminate solder joint failures from board flex or thermal expansion. Power ratings from 1 to 5 watts, resistance values from 0.01 to 5K ohm, tolerances as low as 0.5%. High surge handling capability in a surface mount device and can be used to replace multiple SMD film chips for space and size reduction.
Radial Leaded MOVs in a wide range of sizes and voltages. Provides transient surge protection for AC voltages up to 1000V. Peak current handling up to 6500 amps and energy handling up to 625J. UL1449 certified file no. E476752.
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