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. 123-4330
Mfr. Part No.RK73H2ATTD49R9F
BrandKOA
MYR0.371
Each (In a Bag of 50)
units
49.9Ω 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4387
Mfr. Part No.RK73H2ETTD20R0F
BrandKOA
MYR0.789
Each (In a Bag of 50)
units
20Ω 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4451
Mfr. Part No.RK73HW2HTTE3001F
BrandKOA
MYR0.919
Each (In a Bag of 50)
units
3kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-8098
Mfr. Part No.RK73H1ETTP1001F
BrandKOA
MYR0.143
Each (In a Pack of 100)
units
1kΩ 0402 (1005M) Thick Film ±1% 0.1W ±100ppm/°C AEC-Q200 - - - - RK73H -55°C +155°C
RS Stock No. 123-4464
Mfr. Part No.RK73HW2HTTE4992F
BrandKOA
MYR0.983
Each (In a Bag of 50)
units
49.9kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4461
Mfr. Part No.RK73HW2HTTE3002F
BrandKOA
MYR0.919
Each (In a Bag of 50)
units
30kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4467
Mfr. Part No.RK73HW2HTTE1003F
BrandKOA
MYR0.983
Each (In a Bag of 50)
units
100kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4373
Mfr. Part No.RK73H2BTTD1002F
BrandKOA
MYR0.327
Each (In a Bag of 100)
units
10kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4331
Mfr. Part No.RK73H2ATTD4990F
BrandKOA
MYR0.36
Each (In a Bag of 50)
units
499Ω 1210 (3225M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-5667
Mfr. Part No.RK73Z1JTTD
BrandKOA
MYR0.061
Each (In a Pack of 50)
units
0603 (1608M) Thick Film ±0% - - AEC-Q200 - - - - RK73H -55°C +155°C
RS Stock No. 631-5673
Mfr. Part No.RK73H1JTTD1R00F
BrandKOA
MYR0.107
Each (In a Pack of 50)
units
0603 (1608M) Thick Film ±1% 0.125W ±200ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4407
Mfr. Part No.RK73H2ETTD2001F
BrandKOA
MYR0.49
Each (In a Bag of 50)
units
2kΩ 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4383
Mfr. Part No.RK73H2BTTD1003F
BrandKOA
MYR0.419
Each (In a Bag of 100)
units
100kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4469
Mfr. Part No.RK73HW3ATTE10R0F
BrandKOA
MYR0.883
Each (In a Bag of 50)
units
10Ω 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-5780
Mfr. Part No.RK73H1JTTD3R00F
BrandKOA
MYR0.086
Each (In a Pack of 50)
units
0603 (1608M) Thick Film ±1% 0.125W ±200ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-6979
Mfr. Part No.RK73H1JTTD2703F
BrandKOA
MYR0.086
Each (In a Pack of 50)
units
270kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4369
Mfr. Part No.RK73H2BTTD4701F
BrandKOA
MYR0.098
Each (In a Bag of 100)
units
4.7kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4342
Mfr. Part No.RK73Z2BTTD
BrandKOA
MYR0.18
Each (In a Bag of 100)
units
1206 (3216M) Thick Film ±0% - - - - - - - RK73Z -55°C +155°C
RS Stock No. 123-4393
Mfr. Part No.RK73H2ETTD51R0F
BrandKOA
MYR0.49
Each (In a Bag of 50)
units
51Ω 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4341
Mfr. Part No.RK73G1JTTD1003D
BrandKOA
MYR0.392
Each (In a Bag of 100)
units
100kΩ 0603 (1608M) Thick Film ±0.5% 0.1W ±50ppm/°C - - - - - RK73G -55°C +155°C