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. 720-3215
Mfr. Part No.CRM2512-FX-R100ELF
BrandBourns
HK$9.976
Each (In a Pack of 5)
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100 mΩ 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 167-4485
Mfr. Part No.CRM2512-FX-R100ELF
BrandBourns
HK$3.768
Each (On a Reel of 4000)
units
100 mΩ 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 166-9977
Mfr. Part No.CHV2010-JW-104ELF
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HK$0.952
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. 869-6038
Mfr. Part No.CHV2010-JW-104ELF
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HK$2.30
Each (In a Bag of 10)
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100 kΩ 2010 (5025M) Thick Film ±5% 0.5W ±200ppm/°C - - - - - CHV -55°C +155°C
RS Stock No. 720-3240
Mfr. Part No.CRM2512-JW-4R7ELF
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HK$3.328
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units
4.7 Ω 2512 (6432M) Thick Film ±5% 2W ±200ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 167-4491
Mfr. Part No.CRM2512-JW-4R7ELF
BrandBourns
HK$0.954
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. 166-9917
Mfr. Part No.CRE2512-FZ-R008E-2
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HK$2.225
Each (On a Reel of 4000)
units
8 mΩ 2512 (6432M) Metal Strip ±1% 2W ±75ppm/°C AEC-Q200 - - - - CRE -55°C +170°C
RS Stock No. 824-0329
Mfr. Part No.CRE2512-FZ-R008E-2
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HK$5.116
Each (In a Bag of 10)
units
8 mΩ 2512 (6432M) Metal Strip ±1% 2W ±75ppm/°C AEC-Q200 - - - - CRE -55°C +170°C
RS Stock No. 740-9075
Mfr. Part No.CR0805-JW-104ELF
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HK$0.14
Each (In a Pack of 50)
units
100 kΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 161-6935
Mfr. Part No.CR0805-JW-104ELF
BrandBourns
HK$0.091
Each (On a Reel of 5000)
units
100 kΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 693-4384
Mfr. Part No.CRA2512-FZ-R020ELF
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HK$5.552
Each (In a Pack of 5)
units
20 mΩ 2512 (6432M) Metal Strip ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 740-8880
Mfr. Part No.CR0603-JW-102GLF
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HK$0.314
Each (In a Pack of 50)
units
1 kΩ 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - CR0603 -55°C +155°C
RS Stock No. 740-9145
Mfr. Part No.CRL0805-FW-R050ELF
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HK$2.76
Each (In a Pack of 50)
units
50 mΩ 0805 (2012M) Thick Film ±1% 0.125W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 167-4477
Mfr. Part No.CRA2512-FZ-R020ELF
BrandBourns
HK$1.862
Each (On a Reel of 4000)
units
20 mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 167-4478
Mfr. Part No.CRA2512-FZ-R080ELF
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HK$1.932
Each (On a Reel of 4000)
units
80 mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 167-4785
Mfr. Part No.CR0603-JW-102GLF
BrandBourns
HK$0.043
Each (On a Reel of 10000)
units
1 kΩ 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C - - - - - CR0603 -55°C +155°C
RS Stock No. 167-5439
Mfr. Part No.CRL0805-FW-R050ELF
BrandBourns
HK$0.882
Each (On a Reel of 5000)
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50 mΩ 0805 (2012M) Thick Film ±1% 0.125W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 167-4483
Mfr. Part No.CRA2512-FZ-R025ELF
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HK$1.37
Each (On a Reel of 4000)
units
25 mΩ 2512 (6432M) Metal Alloy ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 693-4390
Mfr. Part No.CRA2512-FZ-R080ELF
BrandBourns
HK$4.672
Each (In a Pack of 5)
units
80 mΩ 2512 (6432M) Metal Strip ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 740-8830
Mfr. Part No.CR0603-FX-2002ELF
BrandBourns
HK$0.071
Each (In a Pack of 50)
units
20 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CR0603 -55°C +155°C