Basic knowledge about SMD Resistors

SMD Resistors


Chip fixed resistors are another name for chip resistors. SMD resistors –, often known as chip fixed resistors, is a kind of metal glass shaft resistor. It’s a resistor created by combining the metal powder with glass shaft powder and screen printing it onto a substrate. It has a low-temperature coefficient and is resistant to dampness and high temperatures.

Chip resistor classification

  • Wire wrapped chip resistors from SMW – UL94V0 flameproof molded packaging with heat, humidity, and insulating resistance.
  • Power metal film chip resistors from SMF – UL94V0 flameproof molded packaging with heat, humidity, and insulating resistance.
  • MCM resistors are thick film chip resistors. – P.C.Board may be compacted due to its small size.
  • Metal film melf resistors from RMM
  • Structure with SMD capability and high solderability.
  • Chip Resistor (CP)
  • Chip resistors with a lot of power
  • Chip resistor characteristics
  • Lightweight and small in size
  • Adapt to reflow and wave soldering techniques.
  • Electrical performance that is consistent and dependable
  • Low-cost assembly and compatibility with automated placement equipment
  • Superior high-frequency properties, strong mechanical strength

Method for designating SMD resistors

  • RS-05K102JT RS-05K102JT RS-05K102JT RS-05K102JT RS-05K102J
  • RS-05K1002FT is a name with a 1% accuracy.

The letter R stands for resistance.

0402 represents 1/16W, 0603 represents 1/10W, 0805 represents 1/8W, 1206 represents 1/4W, 1210 represents 1/3W, 1812 represents 1/2W, 2010 represents 3/4W, and 2512 represents 1W.

The temperature coefficient is 100PPM in K.

J- indicates that the accuracy is 5%, F indicates that the accuracy is 5%, and F indicates that the accuracy is 1%.

Taping packaging is denoted by the letter T

The resistance error accuracy of the chip resistor is one percent, two percent, five percent, and ten percent, with one percent and five percent being the most typically utilized.


Surface assembly technology, or SMT, is widely used, and the share of electronic devices produced using SMT has risen dramatically. The application range of SMT has been increased further with the introduction of compact SMT manufacturing equipment. SMT is used to produce a variety of electronic goods or parts in small batches in sectors such as aviation, aerospace, instrumentation, machine tools, and others.

In recent years, maintenance staff has begun to repair a huge number of electronic goods constructed using SMT, in addition to electronic product developers employing SMD devices to produce new products.

SMD resistor models are currently not standardized. The models are unusually lengthy, and they are determined by the producers themselves. It would be extremely handy if you can appropriately provide the many parameters and specifications of SMD resistors when purchasing. Place your order for the needed resistance.

Size, resistance, tolerance, temperature coefficient, and packaging are the five parameters of chip resistors.

1. SMD resistor series is commonly divided into seven sizes, each of which is represented by two size codes. An EIA code with four digits is known as a one-size code. The length and breadth of the resistor, in inches, are indicated by the first two numerals and the final two digits. The other is the metric code, which is likewise a four-digit number and its unit are millimeters. Resistors of various sizes have varied power ratings.

2. Resistance value series Nominal resistance value is defined by series; each series is split by the resistance tolerance; the smaller the tolerance, the more the resistance is divided; the most widely used series is E-24; resistance tolerance is 5%.

3. Chip resistor tolerance is divided into four levels: F, G, J, and K. The F level has a tolerance of 1%, whereas the G level has a tolerance of 2%, the G level has a tolerance of 2%, and the G level has a tolerance of 5%, and the G level has a tolerance of 10%.

4. Temperature coefficient Chip resistors have two temperature coefficients: W (200ppm/°C) and X (100ppm/°C). Only the resistance with the tolerance of F grade may use the X grade, while the resistance of other grades is general. It belongs to the W group.

5. Bulk and strip-shaped rolls are the two most common forms of packaging.

The chip resistor’s operating temperature range is -55 to +125°C, and the maximum working voltage is proportional to its size. At the moment, the most often used chip resistor size codes are 0805 and 1206, with a trend toward 0603, and the most common tolerance is J level.

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