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. 631-7360
Mfr. Part No.RK73Z1ETTP
BrandKOA
SGD0.015
Each (In a Pack of 100)
units
0 Ω 0402 (1005M) Thick Film ±0% - - - - - - - RK73H -55°C +155°C
RS Stock No. 631-8335
Mfr. Part No.RK73H1ETTP1002F
BrandKOA
SGD0.022
Each (In a Pack of 100)
units
10 kΩ 0402 (1005M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4364
Mfr. Part No.RK73H2BTTD1501F
BrandKOA
SGD0.032
Each (In a Bag of 100)
units
1.5 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4353
Mfr. Part No.RK73H2BTTD1000F
BrandKOA
SGD0.032
Each (In a Bag of 100)
units
100 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-5847
Mfr. Part No.RK73H1JTTD5R10F
BrandKOA
SGD0.035
Each (In a Pack of 50)
units
5.1 Ω 0603 (1608M) Thick Film ±1% 0.125W ±200ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4500
Mfr. Part No.RK73HW3ATTE1502F
BrandKOA
SGD0.239
Each (In a Bag of 50)
units
15 kΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 631-8458
Mfr. Part No.RK73H1ETTP3302F
BrandKOA
SGD0.016
Each (In a Pack of 100)
units
33 kΩ 0402 (1005M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4384
Mfr. Part No.RK73Z2ETTD
BrandKOA
SGD0.194
Each (In a Bag of 50)
units
0 Ω 1210 (3225M) Thick Film ±0% - - - - - - - RK73Z -55°C +155°C
RS Stock No. 631-7944
Mfr. Part No.RK73H1ETTP2400F
BrandKOA
SGD0.016
Each (In a Pack of 100)
units
240 Ω 0402 (1005M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4363
Mfr. Part No.RK73H2BTTD1001F
BrandKOA
SGD0.079
Each (In a Bag of 100)
units
1 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4323
Mfr. Part No.RK73H1ETTP4990F
BrandKOA
SGD0.016
Each (In a Bag of 100)
units
499 Ω 0402 (1005M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4455
Mfr. Part No.RK73HW2HTTE5101F
BrandKOA
SGD0.141
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. 631-5667
Mfr. Part No.RK73Z1JTTD
BrandKOA
SGD0.084
Each (In a Pack of 50)
units
0 Ω 0603 (1608M) Thick Film ±0% - - AEC-Q200 - - - - RK73H -55°C +155°C
RS Stock No. 123-4459
Mfr. Part No.RK73HW2HTTE2002F
BrandKOA
SGD0.141
Each (In a Bag of 50)
units
20 kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4370
Mfr. Part No.RK73H2BTTD4991F
BrandKOA
SGD0.098
Each (In a Bag of 100)
units
4.99 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4452
Mfr. Part No.RK73HW2HTTE3301F
BrandKOA
SGD0.141
Each (In a Bag of 50)
units
3.3 kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6781
Mfr. Part No.WK73S2HTTER150F
BrandKOA
SGD0.52
Each (On a Reel of 4000)
units
150 mΩ 1020 Thick Film ±1% 1W ±200ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 178-6174
Mfr. Part No.HV732BTTD6803F
BrandKOA
SGD0.294
Each (On a Reel of 500)
units
680 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - HV73 -55°C +155°C
RS Stock No. 178-6426
Mfr. Part No.SG73G2ATTD1001D
BrandKOA
SGD0.223
Each (On a Reel of 500)
units
1 kΩ 0805 (2012M) Thick Film ±0.5% 0.5W ±50ppm/°C AEC-Q200 - - - - SG73G -55°C +155°C
RS Stock No. 178-6702
Mfr. Part No.SG73P2BTTD68R0F
BrandKOA
SGD0.103
Each (On a Reel of 5000)
units
68 Ω 1206 (3216M) Thick Film ±1% 0.75W ±200ppm/°C AEC-Q200 - - - - SG73P -55°C +155°C