Surface mount resistor
Surface mount resistors are typically been comprised of a flat rectangular resistive metal strip with high conductivity metal terminals welded to the ends of the resistive metal strip to form the electrical termination points. The resistive metal strip may be "adjusted" to a desired resistance value by abrading or by using a laser to remove some of the resistive material. A protective coating is then applied over the resistive material to provide protection from various environments to which the resistor may be exposed as well as providing strength to the resistor. With the miniaturization of electronic equipment, there has been increased demand for surface-mount components so as to reduce the area for mounting electronic components. Under this circumstance, high precision chip resistors have been demanded as alternatives to conventionally used trimming volumes. In particular, the demand for chip resistors having a low resistance and a small temperature coefficient of resistance used in a power supply circuit has been increased. Conventional surface mount resistors have wrap-around terminals on the ends of the resistor. When such surface mount resistors are soldered to a printed circuit board, solder covers entire surface of the terminals forming a fillets, resulting in occupation of an additional area for mounting. A flip chip resistor is a resistor that has no side electrodes and is soldered with its printed side towards the printed circuit board. With this configuration, the solder fillets are not formed thus decreasing the amount of circuit board space required and increasing the mounting density particularly in the case of small chip sizes.
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