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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RS Stock No. 180-4084
Mfr. Part No.MMA02040E1800BB100
BrandVishay
€0.451
Each (On a Reel of 3000)
units
180Ω Melf 0204 Thin Film ±0.1% 0.07W ±15ppm/K AEC-Q200 - - - - MMA -55°C +125°C
RS Stock No. 180-4449
Mfr. Part No.MMA02040E1800BB100
BrandVishay
€0.496
Each (On a Reel of 500)
units
180Ω Melf 0204 Thin Film ±0.1% 0.07W ±15ppm/K AEC-Q200 - - - - MMA -55°C +125°C
RS Stock No. 678-7630
Mfr. Part No.MMA02040E1800BB100
BrandVishay
€1.362
Each (In a Pack of 5)
units
180Ω Melf 0204 Thin Film ±0.1% 0.25W ±15ppm/°C - - - - - MMA0204 -55°C +175°C
RS Stock No. 812-3362
Mfr. Part No.CRCW0805100RFKEAHP
BrandVishay
€2.15
1 Bag of 25
Bag(s)
100Ω 0805 (2012M) Thick Film ±1% 0.5W ±100ppm/K - - - - - CRCW -55°C +155°C
RS Stock No. 170-1954
Mfr. Part No.CRCW0805100RFKEAHP
BrandVishay
€107.35
1 Reel of 5000
Reel(s)
100Ω 0805 (2012M) Thick Film ±1% 0.5W ±100ppm/K - - - - - CRCW -55°C +155°C
RS Stock No. 679-2402
Mfr. Part No.CRCW2512100RFKEG
BrandVishay
€0.255
Each (In a Pack of 25)
units
100Ω 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 168-8438
Mfr. Part No.CRCW04023M00FKED
BrandVishay
€43.65
1 Reel of 10000
Reel(s)
3MΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 182-3716
Mfr. Part No.CRCW04023M00FKED
BrandVishay
€0.011
Each (On a Reel of 1000)
units
3MΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/K AEC-Q200 - - - - CRCW -55°C +155°C
RS Stock No. 678-9295
Mfr. Part No.CRCW04023M00FKED
BrandVishay
€0.037
Each (In a Pack of 50)
units
3MΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 181-9283
Mfr. Part No.CRCW040234K8FKED
BrandVishay
€0.012
Each (On a Reel of 1000)
units
34.8kΩ 0402 (1005M) Thick Film ±1% - - - - - - - CRCW -55°C +155°C
RS Stock No. 678-9207
Mfr. Part No.CRCW040234K8FKED
BrandVishay
€0.032
Each (In a Pack of 50)
units
34.8kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 168-8415
Mfr. Part No.CRCW040234K8FKED
BrandVishay
€107.35
1 Reel of 10000
Reel(s)
34.8kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 679-0800
Mfr. Part No.CRCW08050000Z0EA
BrandVishay
€0.021
Each (In a Pack of 50)
units
0805 (2012M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 181-9178
Mfr. Part No.CRCW0402240KFKED
BrandVishay
€0.012
Each (On a Reel of 1000)
units
240kΩ 0402 (1005M) Thick Film ±1% - - - - - - - CRCW -55°C +155°C
RS Stock No. 812-3394
Mfr. Part No.CRCW0805150RFKEAHP
BrandVishay
€3.84
1 Tape of 25
Tape(s)
150Ω 0805 (2012M) Thick Film ±1% 0.5W ±100ppm/K - - - - - CRCW -55°C +155°C
RS Stock No. 679-2373
Mfr. Part No.CRCW1210100RFKEA
BrandVishay
€0.183
Each (In a Pack of 50)
units
100Ω 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 168-8357
Mfr. Part No.CRCW0402240KFKED
BrandVishay
€107.35
1 Reel of 10000
Reel(s)
240kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 169-4494
Mfr. Part No.CRCW08050000Z0EA
BrandVishay
€53.68
1 Reel of 5000
Reel(s)
0805 (2012M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 678-9002
Mfr. Part No.CRCW0402240KFKED
BrandVishay
€0.032
Each (In a Pack of 50)
units
240kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 812-1773
Mfr. Part No.CRCW12060000Z0EAHP
BrandVishay
€0.147
Each (In a Bag of 25)
units
1206 (3216M) Thick Film ±0% 0.5W - - - - - - CRCW -55°C +155°C