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. 892-8656
Mfr. Part No.605SJR00500E
BrandOhmite
PHP67.593
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5mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-4493
Mfr. Part No.HVC2512Z1007JET
BrandOhmite
PHP289.80
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1GΩ 2512 (6432M) Wrap Around ±5% 1W ±250ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3456
Mfr. Part No.RW1S0BAR010JET
BrandOhmite
PHP69.085
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10mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-3646
Mfr. Part No.FCSL76R010FER
BrandOhmite
PHP29.862
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10mΩ 7638 Metal Foil ±1% 3W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-5544
Mfr. Part No.RW5S0FAR100FE
BrandOhmite
PHP50.123
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100mΩ L Bend Wire Wound ±1% 5W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-5068
Mfr. Part No.HVF2512T2502FE
BrandOhmite
PHP181.048
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25kΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - HVF -55°C +200°C
RS Stock No. 893-5210
Mfr. Part No.RW1S0BAR020JET
BrandOhmite
PHP71.757
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20mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 892-7376
Mfr. Part No.RW0S6BBR750FET
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PHP32.13
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750mΩ 2010 (5025M) Wire Wound ±1% 0.6W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4813
Mfr. Part No.610HR050E
BrandOhmite
PHP26.245
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50mΩ Welded Metal Film, Wire Wound ±3% 1W - - - - - - 60 +25°C +275°C
RS Stock No. 892-8010
Mfr. Part No.RW3R5EAR010JE
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PHP130.73
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10mΩ - Wire Wound ±5% 3.5W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-3573
Mfr. Part No.MCS1632R020FER
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PHP9.802
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20mΩ 1632 Metal Alloy ±1% 1W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 893-3387
Mfr. Part No.602SJR00300E
BrandOhmite
PHP67.466
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3mΩ 4412 Metal Plate ±5% 0.25W ±100ppm/°C - - - - - 602SJR -40°C +155°C
RS Stock No. 893-4917
Mfr. Part No.FCSL110R010FER
BrandOhmite
PHP56.763
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10mΩ 4320 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4361
Mfr. Part No.605SJR00375E-T
BrandOhmite
PHP35.292
Each (In a Pack of 2000)
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3.75mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-3450
Mfr. Part No.RW1S0BAR100JET
BrandOhmite
PHP87.292
Each (In a Pack of 2000)
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100mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4475
Mfr. Part No.HVC2512T5004JET
BrandOhmite
PHP193.20
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5MΩ 2512 (6432M) Wrap Around ±5% 1W ±100ppm/°C - - - - - HVC -55°C +155°C
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Mfr. Part No.605SJR00800E
BrandOhmite
PHP67.593
Each (In a Pack of 100)
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8mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
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Mfr. Part No.RW2S0CBR050JET
BrandOhmite
PHP62.659
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50mΩ - Wire Wound ±5% 2W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4803
Mfr. Part No.607HR050E
BrandOhmite
PHP26.245
Each (In a Pack of 250)
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50mΩ Welded Metal Film, Wire Wound ±3% 0.75W - - - - - - 60 +25°C +275°C
RS Stock No. 893-5547
Mfr. Part No.RW5S0FA1R00FE
BrandOhmite
PHP46.104
Each (In a Pack of 300)
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- Wire Wound ±1% 5W ±50ppm/°C - - - - - RW -55°C +150°C