Surface Mount Fixed Resistors

Resistors are referred to as a Passive Component. Surface Mount Resistors are more commonly known as SMD (surface mount device) or SMT (Surface mount technology) Resistors. These resistors offer advantages in space saving on Printed Circuit Boards (PCB’s).


Some common package sizes are 0201,0402,0603,0805,1206,1210,2020,2512


SMD Resistors are used in large volumes and are the preferred choice in electronics equipment due to their small size and high reliability. SMD resistors are particularly used in telecommunication, automotive (AEC Q200 qualified) and medical equipment, they also found in personal devices, displays and advanced technology research instruments.


SMD Fixed Resistors


Surface mount fixed resistors are the most widely used resistors as they reduce the flow of the electrical current in circuits. Similar to water flowing along a pipe, the tap controls the flow of water, a resistor controls the flow of current. They work to a fixed value the resistance does not change in temperature or voltage. The most commonly used fixed resistors values are 100KΩ,10kΩ,100Ω, 10Ω


Types of surface mount fixed resistors


  • Thin Film Resistors have a higher precision than the thick film

  • Thick Film Resistors are used for general use due to a lower price point.

  • Moulded Wirewound Resistors offer higher power

  • Foil Resistors for ultra-high precision and really low-Temperature coefficient of resistance

  • Shunts (current sense) Low ohmic values for where current measurement is critical

  • Melf (cylindrical) offering superb pulse load capability

What are surface mount fixed resistors used for?


SMD fixed resistors are very compact and used in most electronic board design. Due to their compact size and the continuous development of ever smaller footprints, this has allowed for the development of ever smaller PCB designs and the ability to get more from the board. The resistors can assist in the reduction of component count on the board.


High Power / Surge / pulse protection


Many manufacturers offer a higher power alternative for the various packages they have available. As an example the 0603 resistor package can vary from 0.1W to 0.25W (rated dissipation 70°C). The higher power alternatives can be used in applications where there is a need to protect against surges / pulses.


What is the difference between Thin Film Resistors and Thick Film Resistors?


The main difference being that the thick film resistors have a paste fired on to the manufacturers chosen substrate. Thin film resistors as the name suggests has an extremely thin metal film that is generally vacuum deposited on to the manufacturers chosen substrate.


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Description Price Resistance Package/Case Technology Tolerance Power Rating Temperature Coefficient Automotive Standard Dimensions Length Depth Height Series Minimum Operating Temperature Maximum Operating Temperature
RS Stock No. 717-1301
BrandRS PRO
kr 0,01
Each (On a Reel of 5000)
Units
127kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 183-9948
BrandRS PRO
kr 0,604
Each (On a Reel of 1000)
Units
- - Thick Film ±5% - - - - - - - - - -
RS Stock No. 713-7033
BrandRS PRO
kr 0,025
Each (On a Reel of 5000)
Units
18kΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 713-6783
BrandRS PRO
kr 0,04
Each (On a Reel of 5000)
Units
12Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 713-6872
BrandRS PRO
kr 0,008
Each (On a Reel of 5000)
Units
180Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 169-1682
BrandRS PRO
kr 0,604
Each (On a Reel of 1000)
Units
6.8kΩ Melf 0102 Thin Film ±1% 0.2W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 717-0730
BrandRS PRO
kr 0,068
Each (On a Reel of 5000)
Units
1.65kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 169-0279
BrandRS PRO
kr 0,112
Each (On a Reel of 3000)
Units
3.3Ω Melf 0204 Thin Film ±1% 0.4W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 713-4090
BrandRS PRO
kr 0,008
Each (On a Reel of 5000)
Units
56Ω 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 713-6939
BrandRS PRO
kr 0,054
Each (On a Reel of 5000)
Units
1kΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 804-6587
BrandRS PRO
kr 0,027
Each (On a Reel of 5000)
Units
47kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9787
BrandRS PRO
kr 0,021
Each (On a Reel of 5000)
Units
160kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 717-3146
BrandRS PRO
kr 0,017
Each (On a Reel of 5000)
Units
154kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 169-1752
BrandRS PRO
kr 0,072
Each (On a Reel of 1000)
Units
470kΩ Melf 0204 Thin Film ±1% 0.4W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 717-0884
BrandRS PRO
kr 0,068
Each (On a Reel of 5000)
Units
5.11kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 804-6524
BrandRS PRO
kr 0,027
Each (On a Reel of 5000)
Units
12kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9611
BrandRS PRO
kr 0,041
Each (On a Reel of 5000)
Units
750Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 717-2733
BrandRS PRO
kr 0,017
Each (On a Reel of 5000)
Units
6.19kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 183-9596
BrandRS PRO
kr 0,084
Each (On a Reel of 5000)
Units
33Ω 1210 (3225M) Thick Film ±1% 0.33W ±100ppm/°C - - - - - CR -55°C +155°C
RS Stock No. 713-4204
BrandRS PRO
kr 0,008
Each (On a Reel of 5000)
Units
27kΩ 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - RS -55°C +155°C
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