SQM700JB-91K

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Through Hole Resistors, most commonly known as THRs, are a type of electrical component that is used to restrict current flow, thereby creating an adjustable voltage drop across a variety of electrical circuits. Developed by resistors manufacturer Stackpole Electronics, the SQM700JB-91K is a component that provides a two-part terminal design that has two different stages of internal resistance depending upon the applied voltage, which helps to prevent the over-voltage or over-current from being applied.

The SQM700JB-91K can be found in a variety of applications, chiefly as a tracking resistor in power management circuits. These tracking resistors are used to create a fine adjustment to the voltage regulation within the circuit, while also providing a relatively low resistance value when compared to other resistors on the market. The SQM700JB-91K can also be used to limit current in many applications, during times when overload protection may be needed. Additionally, it can be used in applications which require current limiting, such as EMC filters, DC/DC converters, switch-mode power supplies, timing circuits, motor speed control, dimmers, and surge protection.

The working principle behind the SQM700JB-91K is dependent on the two-part terminal design. Its primary section is a ceramic brick, which is fixed in place by two metal pins. This ceramic brick provides a high-impedance to the current flow, while also providing insulation from the environment.

Additionally, the ceramic brick is designed with a thermal fuse, which is designed to shut down the component if the temperature of the ceramic brick surpasses a certain threshold. In order to ensure that the ceramic brick does not reach its thermal limit, the second part of the SQM700JB-91K is an adjustable bi-metallic resistor element. This resistor element is designed to significantly reduce the temperature of the ceramic brick, and also adjust the resistance of the SQM700JB-91K in order to fine-tune the voltage drops and currents. When the temperature of the ceramic brick falls below its thermal limit, the thermal fuse is shut off and the bi-metallic resistor element is able to adjust the wattage to the desired level.

The SQM700JB-91K can be used in various other applications depending on the specific requirements of the circuit. It is a widely available component due to its compatible design and ability to be employed in a variety of applications. It is also one of the most reliable resistors on the market, offering users a dependable, long-lasting performance.

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