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. 893-3456
Mfr. Part No.RW1S0BAR010JET
BrandOhmite
HK$12.044
Each (In a Pack of 2000)
units
10 mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-3977
Mfr. Part No.LVK20R010DER
BrandOhmite
HK$7.749
Each (In a Pack of 50)
units
10 mΩ 2010 (5025M) Metal Strip ±0.5% 0.75W ±50ppm/°C - - - - - LVK20 -40°C +125°C
RS Stock No. 893-5503
Mfr. Part No.FC4L64R025FER
BrandOhmite
HK$11.771
Each (In a Pack of 50)
units
25 mΩ 6432 Metal Foil ±1% 2W ±50ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 893-1160
Mfr. Part No.RW1S0BAR027JET
BrandOhmite
HK$12.306
Each (In a Pack of 2000)
units
27 mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-5493
Mfr. Part No.FC4L64R001JER
BrandOhmite
HK$7.098
Each (In a Pack of 1000)
units
1 mΩ 6432 Metal Foil ±5% 2W ±100ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 893-4002
Mfr. Part No.LVK25R002FER
BrandOhmite
HK$14.291
Each (In a Pack of 50)
units
2 mΩ 1224 (3250M) Metal Alloy ±1% 2W ±200ppm/°C - - - - - LVK25 -40°C +125°C
RS Stock No. 892-8007
Mfr. Part No.RW1S0CKR050DE
BrandOhmite
HK$56.784
Each (In a Pack of 10)
units
50 mΩ - Metal Strip ±0.5% 1W ±50ppm/°C - - - - - RW1 -55°C +150°C
RS Stock No. 892-8010
Mfr. Part No.RW3R5EAR010JE
BrandOhmite
HK$22.376
Each (In a Pack of 100)
units
10 mΩ - Wire Wound ±5% 3.5W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 891-6391
Mfr. Part No.620HR005E
BrandOhmite
HK$4.40
Each (In a Pack of 250)
units
5 mΩ Welded Metal Film, Wire Wound ±3% 2W - - - - - - 60 +25°C +275°C
RS Stock No. 893-3652
Mfr. Part No.FCSL76R025FER
BrandOhmite
HK$5.135
Each (In a Pack of 1000)
units
25 mΩ 7638 Metal Foil ±1% 3W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-5553
Mfr. Part No.RW5S0FA47R0JE
BrandOhmite
HK$8.411
Each (In a Pack of 300)
units
47 Ω - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4819
Mfr. Part No.610HR020E
BrandOhmite
HK$5.009
Each (In a Pack of 250)
units
20 mΩ Welded Metal Film, Wire Wound ±3% 1W - - - - - - 60 +25°C +275°C
RS Stock No. 892-6622
Mfr. Part No.HVF1206T1004FE
BrandOhmite
HK$29.249
Each (In a Pack of 100)
units
1 MΩ 1206 (3216M) Thick Film ±1% 0.3W ±100ppm/°C - - - - - HVF -55°C +200°C
RS Stock No. 892-8013
Mfr. Part No.RW2S0CBR050JET
BrandOhmite
HK$10.511
Each (In a Pack of 1000)
units
50 mΩ - Wire Wound ±5% 2W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-5557
Mfr. Part No.RW5S0FA100RJE
BrandOhmite
HK$10.485
Each (In a Pack of 50)
units
100 Ω - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 891-6394
Mfr. Part No.630HR010E
BrandOhmite
HK$4.40
Each (In a Pack of 250)
units
10 mΩ Welded Metal Film, Wire Wound ±3% 3W - - - - - - 60 +25°C +275°C
RS Stock No. 893-3989
Mfr. Part No.LVK20R020FER
BrandOhmite
HK$4.547
Each (In a Pack of 1000)
units
20 mΩ 2010 (5025M) Metal Alloy ±1% 0.75W ±50ppm/°C - - - - - LVK20 -40°C +125°C
RS Stock No. 893-5068
Mfr. Part No.HVF2512T2502FE
BrandOhmite
HK$31.047
Each (In a Pack of 100)
units
25 kΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - HVF -55°C +200°C
RS Stock No. 893-4459
Mfr. Part No.HVC1206T1005JET
BrandOhmite
HK$13.115
Each (In a Pack of 50)
units
10 MΩ 1206 (3216M) Wrap Around ±5% 0.25W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3655
Mfr. Part No.FCSL90R010FER
BrandOhmite
HK$6.468
Each (In a Pack of 1000)
units
10 mΩ 9045 Metal Foil ±1% 4W ±50ppm/°C - - - - - FCSL -55°C +155°C