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. 717-5776
BrandRS PRO
SGD0.005
Each (On a Reel of 5000)
units
3.32kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 717-2571
BrandRS PRO
SGD0.005
Each (On a Reel of 5000)
units
1.87kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 169-1780
BrandRS PRO
SGD0.077
Each (On a Reel of 500)
units
3.3Ω Melf 0207 Thin Film ±1% 0.5W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 804-8889
BrandRS PRO
SGD0.002
Each (On a Reel of 5000)
units
3kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 804-8946
BrandRS PRO
SGD0.002
Each (On a Reel of 5000)
units
18kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 804-7331
BrandRS PRO
SGD0.001
Each (On a Reel of 10000)
units
560kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 716-9566
BrandRS PRO
SGD0.001
Each (On a Reel of 10000)
units
255kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 169-1693
BrandRS PRO
SGD0.086
Each (On a Reel of 1000)
units
150kΩ Melf 0102 Thin Film ±1% 0.2W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 169-1726
BrandRS PRO
SGD0.042
Each (On a Reel of 1000)
units
10Ω Melf 0204 Thin Film ±1% 0.4W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 169-1769
BrandRS PRO
SGD0.042
Each (On a Reel of 1000)
units
2.2kΩ Melf 0204 Thin Film ±1% 0.4W - AEC-Q200 Qualified - - - - - -55°C +155°C
RS Stock No. 802-9664
BrandRS PRO
SGD0.014
Each (On a Reel of 5000)
units
4.3kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9472
BrandRS PRO
SGD0.006
Each (On a Reel of 5000)
units
18Ω 0603 (1608M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 804-8805
BrandRS PRO
SGD0.002
Each (On a Reel of 5000)
units
300Ω 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - - -55°C +155°C
New
RS Stock No. 183-9674
BrandRS PRO
SGD0.015
Each (On a Reel of 1000)
units
- - Thick Film ±1% - - - - - - - - - -
RS Stock No. 717-5319
BrandRS PRO
SGD0.005
Each (On a Reel of 5000)
units
90.9Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 802-9712
BrandRS PRO
SGD0.006
Each (On a Reel of 5000)
units
15kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
New
RS Stock No. 183-9769
BrandRS PRO
SGD0.015
Each (On a Reel of 1000)
units
- - Thick Film ±1% - - - - - - - - - -
RS Stock No. 717-1679
BrandRS PRO
SGD0.007
Each (On a Reel of 5000)
units
0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 713-4258
BrandRS PRO
SGD0.002
Each (On a Reel of 5000)
units
560kΩ 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 804-8877
BrandRS PRO
SGD0.002
Each (On a Reel of 5000)
units
3.3kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - - -55°C +155°C
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