Accordingly SMD resistors are typically used within reels or other packages where there is no chance of different values being mixed. For these devices, once they are loose and out of their packaging it is very difficult to tell their value. Many SMD resistors do not have any markings on them to indicate their value. SMD resistors are the small components with figures on a dark background SMD resistor coding schemes SMD Resistors on a PCB along with other components The SMD resistor markings can be used as a check to ensure the correct values are being fitted, but normally the reels or hoppers will be suitable marked and coded. During manufacture the resistors are held either in tapes that are reeled, or in hoppers used for the surface mount machines. The surface mount resistor code systems provide are mainly used to enable service, repair and fault-finding. Resistors overview Carbon composition Carbon film Metal oxide film Metal film Wirewound SMD resistor MELF resistor Variable resistors Light dependent resistor Thermistor Varistor Resistor colour codes SMD resistor markings & codes Resistor specifications Where & how to buy resistors Standard resistor values & E seriesĪlthough not all SMD resistors, or SMT resistors are marked with their values, some are, and in view of the lack of space the SMD resistor code systems may not always provide an obvious indication of the resistor value. Surface Mount Resistor: codes & markings Surface mount resistors often have small codes on them to indicate their value - there are several different coding schemes that may be seen.
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