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 - Some common package sizes are 0201,0402,0603,0805,1206,1210,2020,2512


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 critica

  • 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. 893-4425
Mfr. Part No.HVC0805T1005JET
BrandOhmite
£1.215
Each (In a Pack of 50)
Units
10MΩ 0805 (2012M) Wrap Around ±5% 0.125W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-5070
Mfr. Part No.LVK12R010DER
BrandOhmite
£0.493
Each (In a Pack of 50)
Units
10mΩ 1206 (3216M) Metal Strip ±0.5% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-4440
Mfr. Part No.HVC0805Z1007JET
BrandOhmite
£4.03
Each
Units
1GΩ 0805 (2012M) Wrap Around ±5% 0.125W ±250ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3964
Mfr. Part No.LVK12R020FER
BrandOhmite
£0.50
Each (In a Pack of 50)
Units
20mΩ 1206 (3216M) Metal Strip ±1% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-5068
Mfr. Part No.HVF2512T2502FE
BrandOhmite
£2.705
Each (In a Pack of 100)
Units
25kΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - HVF -55°C +200°C
RS Stock No. 893-4910
Mfr. Part No.FCSL110R025FER
BrandOhmite
£0.755
Each (In a Pack of 1000)
Units
25mΩ 11050 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4437
Mfr. Part No.HVC0805T1006JET
BrandOhmite
£1.392
Each (In a Pack of 50)
Units
100MΩ 0805 (2012M) Wrap Around ±5% 0.125W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-4447
Mfr. Part No.HVC1206T1004JET
BrandOhmite
£0.757
Each (In a Pack of 50)
Units
1MΩ 1206 (3216M) Wrap Around ±5% 0.25W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3992
Mfr. Part No.LVK24R010DER
BrandOhmite
£0.968
Each (In a Pack of 50)
Units
10mΩ 2412 Metal Alloy ±0.5% 1W ±50ppm/°C - - - - - LVK24 -40°C +125°C
RS Stock No. 893-4018
Mfr. Part No.MC102822505JE
BrandOhmite
£1.663
Each (In a Pack of 500)
Units
25MΩ - Thick Film ±5% 1.5W ±50ppm/°C - - - - - MC102 -55°C +180°C
RS Stock No. 893-3598
Mfr. Part No.MCS3264R005FER
BrandOhmite
£0.316
Each (In a Pack of 50)
Units
5mΩ 3264 Metal Strip ±1% 2W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 892-6638
Mfr. Part No.HVF1206T5002FE
BrandOhmite
£2.548
Each (In a Pack of 100)
Units
50kΩ 1206 (3216M) Thick Film ±1% 0.3W ±100ppm/°C - - - - - HVF -55°C +200°C
RS Stock No. 893-3951
Mfr. Part No.LVK12R010FER
BrandOhmite
£0.385
Each (In a Pack of 50)
Units
10mΩ 1206 (3216M) Metal Strip ±1% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-3999
Mfr. Part No.LVK25R001FER
BrandOhmite
£0.676
Each (In a Pack of 1000)
Units
1mΩ 1224 (3250M) Metal Alloy ±1% 2W ±300ppm/°C - - - - - LVK25 -40°C +125°C
RS Stock No. 893-3961
Mfr. Part No.LVK12R030FER
BrandOhmite
£0.218
Each (In a Pack of 1000)
Units
30mΩ 1206 (3216M) Metal Alloy ±1% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-4002
Mfr. Part No.LVK25R002FER
BrandOhmite
£1.061
Each (In a Pack of 50)
Units
2mΩ 1224 (3250M) Metal Alloy ±1% 2W ±200ppm/°C - - - - - LVK25 -40°C +125°C
RS Stock No. 893-3567
Mfr. Part No.MCS1632R005FER
BrandOhmite
£0.265
Each (In a Pack of 100)
Units
5mΩ 1632 Metal Alloy ±1% 1W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 893-1081
Mfr. Part No.RW3R5EA10R0FE
BrandOhmite
£4.72
Each
Units
10Ω - Wire Wound ±1% 3.5W ±50ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4011
Mfr. Part No.MC102825005JE
BrandOhmite
£1.648
Each (In a Pack of 500)
Units
50MΩ - Thick Film ±5% 1.5W ±50ppm/°C - - - - - MC102 -55°C +180°C
RS Stock No. 893-3995
Mfr. Part No.LVK24R020DER
BrandOhmite
£0.826
Each (In a Pack of 50)
Units
20mΩ 2412 Thick Film ±0.5% 1W ±50ppm/°C - - - - - LVK24 -40°C +125°C