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 (PCBs).

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. 720-3177
Mfr. Part No.CRA2512-FZ-R025ELF
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$1.122
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25mΩ 2512 (6432M) Metal Strip ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 167-4483
Mfr. Part No.CRA2512-FZ-R025ELF
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$0.547
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25mΩ 2512 (6432M) Metal Alloy ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 161-7180
Mfr. Part No.PWR163S-25-15R0J
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$2.494
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15Ω DPAK Metal Film ±5% 25W ±100ppm/°C AEC-Q200 - - - - PWR163 -55°C +155°C
RS Stock No. 819-9937
Mfr. Part No.PWR163S-25-15R0J
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$4.09
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15Ω DPAK Thick Film ±5% 25W ±100ppm/°C AEC-Q200 - - - - PWR163 -55°C +155°C
RS Stock No. 167-4789
Mfr. Part No.CR0805-FX-1002GLF
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$0.014
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10kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 740-8975
Mfr. Part No.CR0805-FX-1002GLF
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$0.069
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10kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 740-9069
Mfr. Part No.CR0805-JW-100ELF
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$0.026
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10Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 867-3000
Mfr. Part No.CRS2010-FX-1001ELF
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$0.716
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1kΩ 2010 (5025M) Thick Film ±1% 1W ±100ppm/°C - - - - - CRS -55°C +150°C
RS Stock No. 740-9013
Mfr. Part No.CR0805-FX-3001ELF
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$0.062
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3kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 166-9990
Mfr. Part No.CRS2010-FX-1001ELF
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$0.261
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1kΩ 2010 (5025M) Thick Film ±1% 1W ±100ppm/°C - - - - - CRS -55°C +150°C
RS Stock No. 167-4711
Mfr. Part No.CR0805-JW-100ELF
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$0.017
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10Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 167-5150
Mfr. Part No.CRL1206-FW-1R00ELF
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$0.03
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1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 162-2539
Mfr. Part No.CR0805-FX-3001ELF
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$0.013
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3kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 794-4180
Mfr. Part No.CRL1206-FW-1R00ELF
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$0.112
Each (In a Pack of 10)
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1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 740-9167
Mfr. Part No.CRL1206-FW-R100ELF
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$0.19
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100mΩ 1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 819-9971
Mfr. Part No.PWR163S-25-2R50J
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$3.75
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2.5Ω DPAK Thick Film ±5% 25W ±100ppm/°C AEC-Q200 - - - - PWR163 -55°C +155°C
RS Stock No. 733-2632
Mfr. Part No.PWR263S-35-3R30J
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$6.12
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3.3Ω TO-263 Thick Film ±5% 35W ±100ppm/°C AEC-Q200 - - - - PWR263S-35 -55°C +155°C
RS Stock No. 167-0061
Mfr. Part No.PWR163S-25-2R50J
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$3.366
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2.5Ω DPAK Metal Film ±5% 25W ±100ppm/°C AEC-Q200 - - - - PWR163 -55°C +155°C
RS Stock No. 167-4480
Mfr. Part No.CRA2512-FZ-R050ELF
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$0.308
Each (On a Reel of 4000)
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50mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 167-4697
Mfr. Part No.CR0603-FX-1000ELF
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$0.004
Each (On a Reel of 5000)
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100Ω 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CR0603 -55°C +155°C