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. 893-5490
Mfr. Part No.FC4L64R005FER
BrandOhmite
HK$10.95
Each (In a Pack of 50)
units
5 mΩ 6432 Metal Foil ±1% 2W ±50ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 893-3456
Mfr. Part No.RW1S0BAR010JET
BrandOhmite
HK$11.814
Each (In a Pack of 2000)
units
10 mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-5493
Mfr. Part No.FC4L64R001JER
BrandOhmite
HK$6.76
Each (In a Pack of 1000)
units
1 mΩ 6432 Metal Foil ±5% 2W ±100ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 893-5070
Mfr. Part No.LVK12R010DER
BrandOhmite
HK$5.73
Each (In a Pack of 50)
units
10 mΩ 1206 (3216M) Metal Strip ±0.5% 0.5W ±50ppm/°C - - - - - LVK12 -40°C +125°C
RS Stock No. 893-5503
Mfr. Part No.FC4L64R025FER
BrandOhmite
HK$10.95
Each (In a Pack of 50)
units
25 mΩ 6432 Metal Foil ±1% 2W ±50ppm/°C - - - - - FC4L -55°C +155°C
RS Stock No. 893-3977
Mfr. Part No.LVK20R010DER
BrandOhmite
HK$7.17
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. 893-1160
Mfr. Part No.RW1S0BAR027JET
BrandOhmite
HK$11.814
Each (In a Pack of 2000)
units
27 mΩ - Wire Wound ±5% 1W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4002
Mfr. Part No.LVK25R002FER
BrandOhmite
HK$11.89
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. 893-4447
Mfr. Part No.HVC1206T1004JET
BrandOhmite
HK$10.44
Each (In a Pack of 50)
units
1 MΩ 1206 (3216M) Wrap Around ±5% 0.25W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-4910
Mfr. Part No.FCSL110R025FER
BrandOhmite
HK$8.395
Each (In a Pack of 1000)
units
25 mΩ 11050 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 892-8004
Mfr. Part No.RW1S5CAR010JE
BrandOhmite
HK$17.11
Each (In a Pack of 100)
units
10 mΩ - Wire Wound ±5% 1.5W ±90ppm/°C - - - - - RW -55°C +150°C
RS Stock No. 893-4914
Mfr. Part No.FCSL110R050FER
BrandOhmite
HK$8.357
Each (In a Pack of 1000)
units
50 mΩ 11050 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4484
Mfr. Part No.HVC2512T1005JET
BrandOhmite
HK$18.31
Each (In a Pack of 500)
units
10 MΩ 2512 (6432M) Wrap Around ±5% 1W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-4917
Mfr. Part No.FCSL110R010FER
BrandOhmite
HK$9.342
Each (In a Pack of 1000)
units
10 mΩ 4320 Metal Foil ±1% 5W ±50ppm/°C - - - - - FCSL -55°C +155°C
RS Stock No. 893-4361
Mfr. Part No.605SJR00375E-T
BrandOhmite
HK$5.809
Each (In a Pack of 2000)
units
3.75 mΩ 4412 Metal Plate ±5% 0.5W ±100ppm/°C - - - - - 605SJR -40°C +155°C
RS Stock No. 893-4459
Mfr. Part No.HVC1206T1005JET
BrandOhmite
HK$12.49
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. 893-4487
Mfr. Part No.HVC2512T5005JET
BrandOhmite
HK$31.49
Each (In a Pack of 10)
units
50 MΩ 2512 (6432M) Wrap Around ±5% 1W ±100ppm/°C - - - - - HVC -55°C +155°C
RS Stock No. 893-3585
Mfr. Part No.MCS1632R030FER
BrandOhmite
HK$3.10
Each (In a Pack of 100)
units
30 mΩ 1632 Metal Strip ±1% 1W ±50ppm/°C - - - - - MCS +70°C +150°C
RS Stock No. 892-8007
Mfr. Part No.RW1S0CKR050DE
BrandOhmite
HK$52.28
Each (In a Pack of 10)
units
50 mΩ - Metal Strip ±0.5% 1W ±50ppm/°C - - - - - RW1 -55°C +150°C
RS Stock No. 893-3989
Mfr. Part No.LVK20R020FER
BrandOhmite
HK$4.33
Each (In a Pack of 1000)
units
20 mΩ 2010 (5025M) Metal Alloy ±1% 0.75W ±50ppm/°C - - - - - LVK20 -40°C +125°C