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. 161-6298
Mfr. Part No.SMW28R2JT
HK$1.21
Each (On a Reel of 2000)
units
8.2 Ω - Wire Wound ±5% 2W ±200ppm/°C - - - - - SM -55°C +200°C
RS Stock No. 647-5270
Mfr. Part No.SMW28R2JT
HK$4.96
Each (In a Pack of 5)
units
8.2 Ω - Wire Wound ±5% 2W ±200ppm/°C - - - - - SM -55°C +200°C
RS Stock No. 213-2266
Mfr. Part No.CRG0603F1K0
HK$0.245
Each (In a Pack of 50)
units
1 kΩ 0603 Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5438
Mfr. Part No.CRG0603F1K0
HK$0.026
Each (On a Reel of 5000)
units
1 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 164-5059
Mfr. Part No.TLR3A20DR006FTDG
HK$2.528
Each (On a Reel of 2000)
units
6 mΩ 2512 (6432M) Metal Strip ±1% 2W ±50ppm/°C - - - - - TLR -55°C +170°C
RS Stock No. 771-7828
Mfr. Part No.TLR3A20DR006FTDG
HK$6.628
Each (In a Pack of 5)
units
6 mΩ 2512 (6432M) Metal Strip ±1% 2W ±50ppm/°C - - - - - TLR -55°C +170°C
RS Stock No. 755-1110
Mfr. Part No.352115RFT
HK$3.827
Each (In a Pack of 10)
units
15 Ω 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - 3521 -55°C +155°C
RS Stock No. 134-5445
Mfr. Part No.CRG0603F10K
HK$0.026
Each (On a Reel of 5000)
units
10 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 213-2531
Mfr. Part No.CRG0603F100K
HK$0.258
Each (In a Pack of 50)
units
100 kΩ 0603 Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 164-4805
Mfr. Part No.352115RFT
HK$1.223
Each (On a Reel of 4000)
units
15 Ω 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - 3521 -55°C +155°C
RS Stock No. 125-1173
Mfr. Part No.CRG0603F10K
HK$0.099
Each (In a Bag of 100)
units
10 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5450
Mfr. Part No.CRG0603F100K
HK$0.026
Each (On a Reel of 5000)
units
100 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 125-1171
Mfr. Part No.CRG0603ZR
HK$0.069
Each (In a Bag of 100)
units
0 Ω 0603 (1608M) Thick Film ±0% 0.1W - - - - - - CRG -55°C +125°C
RS Stock No. 134-5428
Mfr. Part No.CRG0603ZR
HK$0.017
Each (On a Reel of 5000)
units
0 Ω 0603 (1608M) Thick Film ±0% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 224-0238
Mfr. Part No.352056RJT
HK$1.07
Each (In a Pack of 10)
units
56 Ω 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 134-5474
Mfr. Part No.CRG0805F1K0
HK$0.043
Each (On a Reel of 5000)
units
1 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 161-4049
Mfr. Part No.352056RJT
HK$0.419
Each (On a Reel of 4000)
units
56 Ω 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 135-4690
Mfr. Part No.RL73K3AR22J
HK$1.797
Each (On a Reel of 1000)
units
220 mΩ 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - RL73 -55°C +125°C
RS Stock No. 667-8977
Mfr. Part No.CRG0402F100K
HK$0.10
Each (In a Pack of 50)
units
100 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 223-1010
Mfr. Part No.RL73K3AR22J
HK$3.605
Each (In a Pack of 10)
units
220 mΩ 2512 Thick Film ±5% 1W ±200ppm/°C - 6.3 x 0.6mm 6.3mm 3.1mm 0.6mm RL73 -55°C +125°C