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. 802-9539
BrandRS PRO
MYR0.021
Each (On a Reel of 5000)
units
100Ω 0603 (1608M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9618
BrandRS PRO
MYR0.027
Each (On a Reel of 5000)
units
1kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 737-9192
BrandRS PRO
MYR0.006
Each (On a Reel of 5000)
units
4.99kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 717-1556
BrandRS PRO
MYR0.006
Each (On a Reel of 5000)
units
866kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 717-4704
BrandRS PRO
MYR0.047
Each (On a Reel of 5000)
units
1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 804-6423
BrandRS PRO
MYR0.032
Each (On a Reel of 5000)
units
680Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9608
BrandRS PRO
MYR0.02
Each (On a Reel of 5000)
units
560Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 713-1366
BrandRS PRO
MYR0.037
Each (On a Reel of 5000)
units
560Ω 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 804-6398
BrandRS PRO
MYR0.012
Each (On a Reel of 5000)
units
240Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 713-6929
BrandRS PRO
MYR0.009
Each (On a Reel of 5000)
units
680Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 802-9490
BrandRS PRO
MYR0.018
Each (On a Reel of 5000)
units
30Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 802-9582
BrandRS PRO
MYR0.021
Each (On a Reel of 5000)
units
390Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 717-6400
BrandRS PRO
MYR0.014
Each (On a Reel of 5000)
units
402kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 713-1448
BrandRS PRO
MYR0.019
Each (On a Reel of 5000)
units
4.7kΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 802-9668
BrandRS PRO
MYR0.021
Each (On a Reel of 5000)
units
4.7kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 717-1578
BrandRS PRO
MYR0.047
Each (On a Reel of 5000)
units
0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 802-9692
BrandRS PRO
MYR0.021
Each (On a Reel of 5000)
units
10kΩ 1206 (1608M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 737-9186
BrandRS PRO
MYR0.006
Each (On a Reel of 5000)
units
499Ω 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 717-1106
BrandRS PRO
MYR0.006
Each (On a Reel of 5000)
units
29.4kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 716-9743
BrandRS PRO
MYR0.044
Each (On a Reel of 5000)
units
0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - RS -55°C +155°C
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