RWR78S4021FRB12 Datasheet/PDFThrough Hole Resistors, such as the RWR78S4021FRB12, are widely used in a variety of electronic components due to their simple construction, high reliability, and low cost. The combination of their low profile and through-hole designated braking power leads to their popularity in applications from consumer electronics to industrial automation.
RWR78S4021FRB12’s are constructed from a series of eight resistors placed in a single cylindrical body with a lead attached to each resistor. The leads are made of a durable, heat-resistant copper alloy for superior heat and corrosion resistance, and the resistors are made from a wide range of materials including metal oxide film, ceramic, and aluminum nitride. The package size of the RWR78S4021FRB12 is 12.0 mm in diameter and is suitable for most electronic components.
The basic operation of a Through Hole Resistor is a simple one. When a voltage is applied to one lead, an electric current passes through the resistors, causing the resistor material to slowly warm up. The resistance of the material increases with time, and so the voltage drops across the resistor increases. This voltage drop is what limits the current through the resistor.
RWR78S4021FRB12’s are mainly suitable for circuit board assembly where space is a limitation. For instance, when wiring a DC motor, they keep the wiring neat and tidy by keeping it contained in the same package as the resistors. This magnetic package also offers excellent heat dissipation, making them suitable for applications where temperature must be closely monitored.
The RWR78S4021FRB12 Through Hole Resistor also has several distinct advantages over other types of resistors. Since it is constructed from a single package is can often fit tighter spaces and achieve higher levels of integration than multiple resistors. The single package eliminates the need for external parts such as heat sinks and bores, which further reduces the cost and complexity of the device. Additionally, they are extremely reliable, with a typical lifespan of 15 years or more.
Overall, the RWR78S4021FRB12 Through Hole Resistor is an ideal solution for a wide variety of applications and electronic components. It is relatively low cost, and its solid construction and range of materials makes it extremely durable and reliable. The ability to fit into tight spaces and perform high levels of integration makes it ideal for space-constrained circuits, while its excellent heat dissipation makes it a good choice for temperature-sensitive electronics.