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. 134-5474
Mfr. Part No.CRG0805F1K0
HK$0.039
Each (On a Reel of 5000)
units
1 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 161-4049
Mfr. Part No.352056RJT
HK$0.419
Each (On a Reel of 4000)
units
56 Ω 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 169-3235
Mfr. Part No.WSL2010R1000FEA
BrandVishay
HK$2.472
Each (On a Reel of 4000)
units
100 mΩ 2010 (5025M) Metal Strip ±1% 0.5W ±75ppm/°C - - - - - WSL -65°C +170°C
RS Stock No. 224-0238
Mfr. Part No.352056RJT
HK$3.38
Each (In a Pack of 10)
units
56 Ω 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 169-4495
Mfr. Part No.CRCW0805100KFKEA
BrandVishay
HK$0.062
Each (On a Reel of 5000)
units
100 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 166-9977
Mfr. Part No.CHV2010-JW-104ELF
BrandBourns
HK$0.908
Each (On a Reel of 4000)
units
100 kΩ 2010 (5025M) Thick Film ±5% 0.5W ±200ppm/°C - - - - - CHV -55°C +155°C
RS Stock No. 771-7815
Mfr. Part No.TLR3A20DR0045FTDG
HK$6.20
Each (In a Pack of 5)
units
4.5 mΩ 2512 (6432M) Metal Strip ±1% 2W ±50ppm/°C - - - - - TLR -55°C +170°C
RS Stock No. 721-5987
Mfr. Part No.ERJ8BQF2R7V
BrandPanasonic
HK$4.058
Each (In a Pack of 5)
units
2.7 Ω 1206 (3216M) Thick Film ±1% 0.5W ±200ppm/°C AEC-Q200 - - - - ERJ8BQ -55°C +125°C
RS Stock No. 181-9093
Mfr. Part No.CRCW04020000Z0ED
BrandVishay
HK$0.043
Each (On a Reel of 1000)
units
0 Ω - Thick Film - - - - - - - - CRCW -55°C +155°C
RS Stock No. 223-1010
Mfr. Part No.RL73K3AR22J
HK$3.563
Each (In a Pack of 10)
units
220 mΩ 2512 Thick Film ±5% 1W ±200ppm/°C - 6.3 x 0.6mm 6.3mm 3.1mm 0.6mm RL73 -55°C +125°C
RS Stock No. 134-5493
Mfr. Part No.CRG0805F68K
HK$0.043
Each (On a Reel of 5000)
units
68 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 135-8321
Mfr. Part No.CRG0402F100K
HK$0.017
Each (On a Reel of 10000)
units
100 kΩ 0603 (1608M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 135-4690
Mfr. Part No.RL73K3AR22J
HK$1.776
Each (On a Reel of 1000)
units
220 mΩ 2512 (6432M) Thick Film ±5% 1W ±200ppm/°C - - - - - RL73 -55°C +125°C
RS Stock No. 117-694
Mfr. Part No.RMC1/10K220FTP
BrandKamaya
HK$0.174
Each (In a Pack of 100)
units
22 Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RMC -55°C +155°C
RS Stock No. 167-4491
Mfr. Part No.CRM2512-JW-4R7ELF
BrandBourns
HK$0.828
Each (On a Reel of 4000)
units
4.7 Ω 2512 (6432M) Thick Film ±5% 2W ±200ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 807-8174
Mfr. Part No.ERJ-1TRSJR10U
BrandPanasonic
HK$7.70
Each
units
100 mΩ 2512 (6432M) Thick Film ±5% 1W -100 → +600ppm/°C - - - - - ERJ -55°C +155°C
RS Stock No. 163-8728
Mfr. Part No.35206R8JT
HK$0.419
Each (On a Reel of 4000)
units
6.8 Ω 2512 (6432M) Thick Film ±5% 1W ±350ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 166-7616
Mfr. Part No.CRCW04020000Z0ED
BrandVishay
HK$0.027
Each (On a Reel of 10000)
units
0 Ω 0402 (1005M) Thick Film ±0% 0.063W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 223-0663
Mfr. Part No.CRG0805F68K
HK$0.415
Each (In a Pack of 50)
units
68 kΩ 0805 Thick Film ±1% 0.125W ±100ppm/°C - 2 x 0.5mm 2mm 1.25mm 0.5mm CRG -55°C +125°C
RS Stock No. 720-3240
Mfr. Part No.CRM2512-JW-4R7ELF
BrandBourns
HK$4.11
Each (In a Pack of 5)
units
4.7 Ω 2512 (6432M) Thick Film ±5% 2W ±200ppm/°C - - - - - CRM -55°C +155°C
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