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. 125-1189
Mfr. Part No.CRG0805F10K
PHP0.56
Each (In a Bag of 100)
units
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5485
Mfr. Part No.CRG0805F10K
PHP0.258
Each (On a Reel of 5000)
units
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 125-1190
Mfr. Part No.CRG1206F1K0
PHP0.786
Each (In a Bag of 100)
units
1 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 213-2266
Mfr. Part No.CRG0603F1K0
PHP1.547
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. 134-5516
Mfr. Part No.CRG1206F1K0
PHP0.412
Each (On a Reel of 5000)
units
1 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5438
Mfr. Part No.CRG0603F1K0
PHP0.155
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. 223-0427
Mfr. Part No.CRG0805F1K0
PHP2.527
Each (In a Pack of 50)
units
1 kΩ 0805 Thick Film ±1% 0.125W ±100ppm/°C - 2 x 0.5mm 2mm 1.25mm 0.5mm CRG -55°C +125°C
RS Stock No. 134-5474
Mfr. Part No.CRG0805F1K0
PHP0.258
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. 161-6303
Mfr. Part No.CRG0603F1M0
PHP0.155
Each (On a Reel of 5000)
units
1 MΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 213-2676
Mfr. Part No.CRG0603F1M0
PHP1.743
Each (In a Pack of 50)
units
1 MΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 162-0107
Mfr. Part No.CRGH0805J33K
PHP0.473
Each (On a Reel of 5000)
units
33 kΩ 0805 (2012M) Thick Film ±5% 0.33W ±200ppm/°C - - - - - CRGH -55°C +155°C
RS Stock No. 223-2221
Mfr. Part No.CRG1206F560R
PHP0.949
Each (In a Pack of 50)
units
560 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5522
Mfr. Part No.CRG1206F4K7
PHP0.42
Each (On a Reel of 5000)
units
4.7 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5514
Mfr. Part No.CRG1206F560R
PHP0.412
Each (On a Reel of 5000)
units
560 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 807-5787
Mfr. Part No.CRGH0805J33K
PHP0.739
Each (In a Bag of 100)
units
33 kΩ 0805 (2012M) Thick Film ±5% 0.33W ±200ppm/°C - - - - - CRGH -55°C +155°C
RS Stock No. 125-1191
Mfr. Part No.CRG1206F4K7
PHP0.84
Each (In a Bag of 100)
units
4.7 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 223-2142
Mfr. Part No.CRG1206F150R
PHP2.389
Each (In a Pack of 50)
units
150 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 164-6230
Mfr. Part No.35223R3JT
PHP9.129
Each (On a Reel of 2000)
units
3.3 Ω 2512 (6432M) Thick Film ±5% 3W - - - - - - 3522 -55°C +105°C
RS Stock No. 134-5507
Mfr. Part No.CRG1206F150R
PHP0.412
Each (On a Reel of 5000)
units
150 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 871-1020
Mfr. Part No.35223R3JT
PHP24.531
Each (In a Bag of 10)
units
3.3 Ω 2512 (6432M) Thick Film ±5% 3W - - - - - - 3522 -55°C +105°C