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. 892-8656
Mfr. Part No.605SJR00500E
BrandOhmite
SGD1.767
Each (In a Pack of 100)
units
5 mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-3977
Mfr. Part No.LVK20R010DER
BrandOhmite
SGD1.344
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. 893-5569
Mfr. Part No.RW5S0FA4K70JE
BrandOhmite
SGD1.438
Each (In a Pack of 300)
units
4.7 kΩ - Wire Wound ±5% 5W ±20ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4364
Mfr. Part No.605SJR00500E-T
BrandOhmite
SGD1.136
Each (In a Pack of 2000)
units
5 mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-4011
Mfr. Part No.MC102825005JE
BrandOhmite
SGD3.26
Each (In a Pack of 500)
units
50 MΩ - Thick Film ±5% 1.5W ±50ppm/°C - - - - - MC102 -55°C +180°C
RS Stock No. 892-8644
Mfr. Part No.605SJR00200E
BrandOhmite
SGD1.767
Each (In a Pack of 100)
units
2 mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-4352
Mfr. Part No.605SJR00200E-T
BrandOhmite
SGD1.106
Each (In a Pack of 2000)
units
2 mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 892-8007
Mfr. Part No.RW1S0CKR050DE
BrandOhmite
SGD9.818
Each (In a Pack of 10)
units
50 mΩ - Metal Strip ±0.5% 1W ±50ppm/°C - - - - - RW1 -55°C +150°C
RS Stock No. 893-3598
Mfr. Part No.MCS3264R005FER
BrandOhmite
SGD0.632
Each (In a Pack of 50)
units
5 mΩ 3264 Metal Strip ±1% 2W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 891-6391
Mfr. Part No.620HR005E
BrandOhmite
SGD0.786
Each (In a Pack of 250)
units
5 mΩ Welded Metal Film, Wire Wound ±3% 2W - - - - - - 60 +25°C +275°C
RS Stock No. 893-4421
Mfr. Part No.HVC0805T5004JET
BrandOhmite
SGD1.323
Each (In a Pack of 500)
units
5 MΩ 0805 (2012M) Wrap Around ±5% 0.125W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3624
Mfr. Part No.FCSL76R002GER
BrandOhmite
SGD0.842
Each (In a Pack of 1000)
units
2 mΩ 7638 Metal Foil ±2% 3W ±100ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4002
Mfr. Part No.LVK25R002FER
BrandOhmite
SGD2.247
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. 891-6408
Mfr. Part No.630HR050E
BrandOhmite
SGD0.66
Each (In a Pack of 250)
units
50 mΩ Welded Metal Film, Wire Wound ±3% 3W - - - - - - 60 +25°C +275°C
RS Stock No. 893-3999
Mfr. Part No.LVK25R001FER
BrandOhmite
SGD1.31
Each (In a Pack of 1000)
units
1 mΩ 1224 (3250M) Metal Alloy ±1% 2W ±300ppm/°C - - - - - LVK25 -40°C +125°C
RS Stock No. 893-4822
Mfr. Part No.615HR010E
BrandOhmite
SGD0.893
Each (In a Pack of 250)
units
10 mΩ Welded Metal Film, Wire Wound ±3% 1.5W - - - - - - 60 +25°C +275°C
RS Stock No. 893-3605
Mfr. Part No.MCS3264R020FER
BrandOhmite
SGD0.321
Each (In a Pack of 4000)
units
20 mΩ 3264 Metal Alloy ±1% 2W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 893-4478
Mfr. Part No.HVC1206Z1008KET
BrandOhmite
SGD13.05
Each
units
10 GΩ 1206 (3216M) Wrap Around ±10% 0.25W ±250ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-4910
Mfr. Part No.FCSL110R025FER
BrandOhmite
SGD1.481
Each (In a Pack of 1000)
units
25 mΩ 11050 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-5490
Mfr. Part No.FC4L64R005FER
BrandOhmite
SGD1.985
Each (In a Pack of 50)
units
5 mΩ 6432 Metal Foil ±1% 2W ±50ppm/°C - - - - - FC4L -55°C +155°C