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. 631-4901
Mfr. Part No.RK73H2ATTD7501F
BrandKOA
$0.049
Each (In a Pack of 50)
units
7.5 kΩ 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-5358
Mfr. Part No.RK73H2ATTD5603F
BrandKOA
$0.057
Each (In a Pack of 50)
units
560 kΩ 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4427
Mfr. Part No.RK73HW2HTTE10R0F
BrandKOA
$0.131
Each (In a Bag of 50)
units
10 Ω 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-4478
Mfr. Part No.RK73H2ATTD1200F
BrandKOA
$0.051
Each (In a Pack of 50)
units
120 Ω 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4404
Mfr. Part No.RK73H2ETTD6800F
BrandKOA
$0.066
Each (In a Bag of 50)
units
680 Ω 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4345
Mfr. Part No.RK73H2BTTD20R0F
BrandKOA
$0.019
Each (In a Bag of 100)
units
20 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-7017
Mfr. Part No.RK73H1JTTD3903F
BrandKOA
$0.013
Each (In a Pack of 50)
units
390 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-5011
Mfr. Part No.RK73H2ATTD2202F
BrandKOA
$0.044
Each (In a Pack of 50)
units
22 kΩ 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6705
Mfr. Part No.RN73H1JTTD1000B25
BrandKOA
$0.144
Each (On a Reel of 500)
units
100 Ω 0603 (1608M) Thin Film ±0.1% 0.1W ±25ppm/°C AEC-Q200 - - - - RN73H +85°C +155°C
RS Stock No. 178-6706
Mfr. Part No.SG73P2BTTD1500F
BrandKOA
$0.118
Each (On a Reel of 5000)
units
150 Ω 1206 (3216M) Thick Film ±1% 0.75W ±200ppm/°C AEC-Q200 - - - - SG73P -55°C +155°C
RS Stock No. 178-6917
Mfr. Part No.WK73S2HTTE1R00F
BrandKOA
$0.467
Each (On a Reel of 250)
units
1 Ω 1020 Thick Film ±1% 1W ±100ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 178-6454
Mfr. Part No.RN73H1JTTD3903B25
BrandKOA
$0.112
Each (On a Reel of 5000)
units
390 kΩ 0603 (1608M) Thin Film ±0.1% 0.1W ±25ppm/°C AEC-Q200 - - - - RN73H +85°C +155°C
RS Stock No. 123-4453
Mfr. Part No.RK73HW2HTTE4701F
BrandKOA
$0.131
Each (In a Bag of 50)
units
4.7 kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6707
Mfr. Part No.SG73P2BTTD2200F
BrandKOA
$0.118
Each (On a Reel of 5000)
units
220 Ω 1206 (3216M) Thick Film ±1% 0.75W ±200ppm/°C AEC-Q200 - - - - SG73P -55°C +155°C
RS Stock No. 178-6918
Mfr. Part No.WK73R2BTTD1500F
BrandKOA
$0.262
Each (On a Reel of 250)
units
150 Ω 0612 (1632M) Thick Film ±1% 0.75W ±100ppm/°C AEC-Q200 - - - - WK73R -55°C +155°C
RS Stock No. 187-7998
Mfr. Part No.RN73H2ATTD3301B25
BrandKOA
$0.231
Each (On a Tape of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 123-4455
Mfr. Part No.RK73HW2HTTE5101F
BrandKOA
$0.131
Each (In a Bag of 50)
units
5.1 kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6137
Mfr. Part No.HV732ATTD1203F
BrandKOA
$0.099
Each (On a Reel of 500)
units
120 kΩ 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - HV73 -55°C +155°C
RS Stock No. 178-6716
Mfr. Part No.RN73H1JTTD6801B25
BrandKOA
$0.144
Each (On a Reel of 500)
units
6.8 kΩ 0603 (1608M) Thin Film ±0.1% 0.1W ±25ppm/°C AEC-Q200 - - - - RN73H +85°C +155°C
RS Stock No. 178-6240
Mfr. Part No.SG73G2ATTD22R0D
BrandKOA
$0.274
Each (On a Reel of 5000)
units
22 Ω 0805 (2012M) Thick Film ±0.5% 0.5W ±50ppm/°C AEC-Q200 - - - - SG73G -55°C +155°C