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. 893-4478
Mfr. Part No.HVC1206Z1008KET
BrandOhmite
€7.44
Each
units
10GΩ 1206 (3216M) Wrap Around ±10% 0.25W ±250ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-4437
Mfr. Part No.HVC0805T1006JET
BrandOhmite
€1.573
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. 893-5566
Mfr. Part No.RW5S0FA1K00JE
BrandOhmite
€0.741
Each (In a Pack of 300)
units
1kΩ - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4011
Mfr. Part No.MC102825005JE
BrandOhmite
€1.922
Each (In a Pack of 500)
units
50MΩ - Thick Film ±5% 1.5W ±50ppm/°C - - - - - MC102 -55°C +180°C
RS Stock No. 893-4368
Mfr. Part No.605SJR00800E-T
BrandOhmite
€0.631
Each (In a Pack of 2000)
units
8mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-5550
Mfr. Part No.RW5S0FA20R0JE
BrandOhmite
€0.741
Each (In a Pack of 300)
units
20Ω - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4421
Mfr. Part No.HVC0805T5004JET
BrandOhmite
€0.764
Each (In a Pack of 500)
units
5MΩ 0805 (2012M) Wrap Around ±5% 0.125W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3456
Mfr. Part No.RW1S0BAR010JET
BrandOhmite
€1.288
Each (In a Pack of 2000)
units
10mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-3964
Mfr. Part No.LVK12R020FER
BrandOhmite
€0.393
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. 892-7379
Mfr. Part No.RW0S6BBR050FET
BrandOhmite
€0.55
Each (In a Pack of 2500)
units
50mΩ 2010 (5025M) Wire Wound ±1% 0.6W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-3636
Mfr. Part No.FCSL64R005FER
BrandOhmite
€398.66
Each (In a Pack of 1000)
units
5mΩ 6432 Metal Foil ±1% 2W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-3655
Mfr. Part No.FCSL90R010FER
BrandOhmite
€0.587
Each (In a Pack of 1000)
units
10mΩ 9045 Metal Foil ±1% 4W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4370
Mfr. Part No.610SJR00300E-T
BrandOhmite
€0.657
Each (In a Pack of 3000)
units
3mΩ J Bend Metal Plate ±5% 1W ±350ppm/°C - - - - - 610SJR -40°C +155°C
RS Stock No. 892-8644
Mfr. Part No.605SJR00200E
BrandOhmite
€1.008
Each (In a Pack of 100)
units
2mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-5553
Mfr. Part No.RW5S0FA47R0JE
BrandOhmite
€0.741
Each (In a Pack of 300)
units
47Ω - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4002
Mfr. Part No.LVK25R002FER
BrandOhmite
€1.416
Each (In a Pack of 50)
units
2mΩ 1224 (3250M) Metal Alloy ±1% 2W ±200ppm/°C - - - - - LVK25 -40°C +125°C
RS Stock No. 892-7372
Mfr. Part No.RW0S6BBR100FET
BrandOhmite
€0.549
Each (In a Pack of 2500)
units
100mΩ 2010 (5025M) Wire Wound ±1% 0.6W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 892-8656
Mfr. Part No.605SJR00500E
BrandOhmite
€1.008
Each (In a Pack of 100)
units
5mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-3967
Mfr. Part No.LVK12R024FER
BrandOhmite
€0.393
Each (In a Pack of 50)
units
24mΩ 1206 (3216M) Metal Strip ±1% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-4018
Mfr. Part No.MC102822505JE
BrandOhmite
€1.879
Each (In a Pack of 500)
units
25MΩ - Thick Film ±5% 1.5W ±50ppm/°C - - - - - MC102 -55°C +180°C