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. 172-2208
Mfr. Part No.EBWB-MR0002FE
TWD35.90
Each (On a Reel of 2000)
units
200 µΩ - Manganin Alloy ±1% 7W ±100ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 126-0361
Mfr. Part No.FC4L32R050FER
TWD30.30
Each (In a Bag of 10)
units
50 mΩ 1206 (3216M) Metal Foil ±1% 1W ±50ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 124-9340
Mfr. Part No.EBWB-MR0002FE
TWD84.20
Each (In a Bag of 5)
units
200 µΩ 0603 (1608M) Manganin Alloy ±1% 7W ±100ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 126-0369
Mfr. Part No.FCSL05R010FER
TWD6.60
Each (In a Bag of 5000)
units
10 mΩ - Metal Foil ±1% 0.2W - - - - - - FCSL -55°C +155°C
RS Stock No. 136-4773
Mfr. Part No.AS25J1000ET
TWD6.50
Each (On a Tape of 100)
units
100 Ω 2512 (6432M) Thick Film ±5% 1.5W ±100ppm/°C - - - - - AS25 -55°C +155°C
RS Stock No. 172-2175
Mfr. Part No.EBWA-NR0020FE
TWD28.80
Each (On a Reel of 3000)
units
2 mΩ 0402 (1005M) NiCr Alloy ±1% 4W ±100ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 126-0402
Mfr. Part No.MCS3264R020FER
TWD20.60
Each (In a Bag of 20)
units
20 mΩ 1225 (3264M) Metal Film ±1% 2W ±50ppm/°C - - - - - MCS -25°C +125°C
RS Stock No. 126-0376
Mfr. Part No.FCSL110R050FER
TWD77.40
Each (In a Bag of 5)
units
50 mΩ 4320 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 136-3322
Mfr. Part No.AS25J1R00ET
TWD3.50
Each (On a Reel of 4000)
units
1 Ω 2512 (6432M) Thick Film ±5% 1.5W ±400ppm/°C - - - - - AS25 -55°C +155°C
RS Stock No. 136-3328
Mfr. Part No.AS25J1003ET
TWD3.70
Each (On a Reel of 4000)
units
100 kΩ 2512 (6432M) Thick Film ±5% 1.5W ±100ppm/°C - - - - - AS25 -55°C +155°C
RS Stock No. 126-0370
Mfr. Part No.FCSL05R020FER
TWD6.60
Each (In a Bag of 5000)
units
20 mΩ - Metal Foil ±1% 0.2W - - - - - - FCSL -55°C +155°C
RS Stock No. 126-0379
Mfr. Part No.LVK12R010FER
TWD28.00
Each (In a Bag of 5)
units
10 mΩ 0402 (1005M) - ±1% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 124-9343
Mfr. Part No.EBWB-NR0010FE
TWD84.20
Each (In a Bag of 5)
units
1 mΩ 0603 (1608M) NiCr Alloy ±1% 6W ±120ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 172-2201
Mfr. Part No.EBWA-MR0005FE
TWD32.90
Each (On a Reel of 3000)
units
500 µΩ - Manganin Alloy ±1% 5W ±75ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 136-4750
Mfr. Part No.AS12J1R00ET
TWD1.80
Each (On a Tape of 100)
units
1 Ω 1206 (3216M) Thick Film ±5% 0.5W ±400ppm/°C - - - - - AS12 -55°C +155°C
RS Stock No. 136-3325
Mfr. Part No.AS25J1000ET
TWD3.60
Each (On a Reel of 4000)
units
100 Ω 2512 (6432M) Thick Film ±5% 1.5W ±100ppm/°C - - - - - AS25 -55°C +155°C
RS Stock No. 136-3323
Mfr. Part No.AS25J10R0ET
TWD3.80
Each (On a Reel of 4000)
units
10 Ω 2512 (6432M) Thick Film ±5% 1.5W ±400ppm/°C - - - - - AS25 -55°C +155°C
RS Stock No. 172-2176
Mfr. Part No.EBWA-NR0030FE
TWD28.80
Each (On a Reel of 3000)
units
3 mΩ - NiCr Alloy ±1% 3W ±100ppm/°C - - - - - EBW -55°C +170°C
RS Stock No. 126-0403
Mfr. Part No.MCS3264R025FER
TWD20.60
Each (In a Bag of 20)
units
25 mΩ 1225 (3264M) Metal Film ±1% 2W ±50ppm/°C - - - - - MCS -25°C +125°C
RS Stock No. 126-0349
Mfr. Part No.FC4L110R010FER
TWD84.60
Each (In a Bag of 5)
units
10 mΩ 4320 Metal Foil ±1% 5W ±50ppm/°C - - - - - FC4L -55°C +155°C