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. 179-1263
Mfr. Part No.73L3R47J
BrandCTS
TWD0.80
Each (On a Reel of 1000)
units
470 mΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1291
Mfr. Part No.73L4R47J
BrandCTS
TWD1.20
Each (On a Reel of 1000)
units
470 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1225
Mfr. Part No.73L5R20J
BrandCTS
TWD2.60
Each (On a Reel of 1000)
units
200 mΩ 3225 Thick Film ±5% 0.5W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1281
Mfr. Part No.73L4R20J
BrandCTS
TWD1.20
Each (On a Reel of 1000)
units
200 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0174
Mfr. Part No.73L3R10J
BrandCTS
TWD0.60
Each (On a Reel of 5000)
units
100 mΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0178
Mfr. Part No.73L4R20J
BrandCTS
TWD0.90
Each (On a Reel of 5000)
units
200 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1217
Mfr. Part No.73E4R050J
BrandCTS
TWD16.70
Each (On a Reel of 250)
units
50 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±100ppm/°C - - - - - 73Ex -55°C +125°C
RS Stock No. 179-1259
Mfr. Part No.73L7R10J
BrandCTS
TWD8.30
Each (On a Reel of 250)
units
100 mΩ 6432 Thick Film ±5% 1W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1237
Mfr. Part No.73L2R20J
BrandCTS
TWD0.60
Each (On a Reel of 1000)
units
200 mΩ 1608 Thick Film ±5% 0.1W ±300ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0175
Mfr. Part No.73L3R20J
BrandCTS
TWD0.60
Each (On a Reel of 5000)
units
200 mΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0172
Mfr. Part No.73L1R20J
BrandCTS
TWD0.40
Each (On a Reel of 10000)
units
200 mΩ 0402 (1005M) Thick Film ±5% 0.1W ±300ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1256
Mfr. Part No.73L3R20J
BrandCTS
TWD0.80
Each (On a Reel of 1000)
units
200 mΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1270
Mfr. Part No.73L7R20J
BrandCTS
TWD8.30
Each (On a Reel of 250)
units
200 mΩ 6432 Thick Film ±5% 1W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0177
Mfr. Part No.73L4R10J
BrandCTS
TWD0.90
Each (On a Reel of 5000)
units
100 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1273
Mfr. Part No.73L4R10J
BrandCTS
TWD1.20
Each (On a Reel of 1000)
units
100 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1233
Mfr. Part No.73L5R47J
BrandCTS
TWD2.60
Each (On a Reel of 1000)
units
470 mΩ 3225 Thick Film ±5% 0.5W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0171
Mfr. Part No.73E4R050J
BrandCTS
TWD3.00
Each (On a Reel of 5000)
units
50 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±100ppm/°C - - - - - 73Ex -55°C +125°C
RS Stock No. 179-1228
Mfr. Part No.73L1R20J
BrandCTS
TWD0.70
Each (On a Reel of 1000)
units
200 mΩ 0402 (1005M) Thick Film ±5% 0.1W ±300ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-1251
Mfr. Part No.73L6R20J
BrandCTS
TWD4.40
Each (On a Reel of 500)
units
200 mΩ 2010 (5025M) Thick Film ±5% 0.75W ±200ppm/°C - - - - - 73Lx -55°C +125°C
RS Stock No. 179-0184
Mfr. Part No.73L6R20J
BrandCTS
TWD3.00
Each (On a Reel of 4000)
units
200 mΩ 2010 (5025M) Thick Film ±5% 0.75W ±200ppm/°C - - - - - 73Lx -55°C +125°C