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. 182-4704
Mfr. Part No.SMA-A0207BTNT330R
€0.972
Each (On a Reel of 250)
units
330Ω Melf 0207 Thin Film ±0.1% 1W ±15ppm/°C AEC-Q200 - - - - SMA-A -55°C +155°C
RS Stock No. 732-5921
Mfr. Part No.ERJ3GEYJ511V
BrandPanasonic
€15.04
1 Reel of 5000
Reel(s)
510Ω 0603 (1608M) Thick Film ±5% 0.1W ±200ppm/°C AEC-Q200 - - - - ERJ3G -55°C +155°C
RS Stock No. 678-8970
Mfr. Part No.CRCW0402221KFKED
BrandVishay
€0.031
Each (In a Pack of 50)
units
221kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 181-9184
Mfr. Part No.CRCW04021K24FKED
BrandVishay
€0.012
Each (On a Reel of 1000)
units
1.24kΩ 0402 (1005M) Thick Film ±1% - - - - - - - CRCW -55°C +155°C
RS Stock No. 810-2135
Mfr. Part No.ERJ3RBD1500V
BrandPanasonic
€0.022
Each (In a Bag of 100)
units
150Ω 0603 (1608M) Thick Film ±0.5% 0.1W ±50ppm/°C AEC-Q200 - - - - ERJ -55°C +125°C
RS Stock No. 176-4414
Mfr. Part No.CRGP2010F39K
€0.122
Each (On a Reel of 500)
units
39kΩ 2010 (5025M) Thick Film ±1% 1.25W ±100ppm/°C - - - - - CRGP -55°C +155°C
RS Stock No. 683-6681
Mfr. Part No.WSR2R0500FEA
BrandVishay
€1.074
Each (In a Pack of 5)
units
50mΩ 4257 (11070M Metal Strip ±1% 2W ±75ppm/°C - - - - - WSR2 -65°C +275°C
RS Stock No. 122-6469
Mfr. Part No.CPF0402B953RE1
€0.074
Each (In a Bag of 20)
units
953Ω 0402 (1005M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 144-5397
Mfr. Part No.CPF0805B464RE1
€0.115
Each (On a Reel of 1000)
units
464Ω 0805 (2012M) Thin Film ±0.1% 0.1W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 740-8990
Mfr. Part No.CR0805-FX-1501ELF
BrandBourns
€0.012
Each (In a Pack of 50)
units
1.5kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 669-6519
Mfr. Part No.ERA8AEB181V
BrandPanasonic
€0.554
Each (In a Pack of 5)
units
180Ω 1206 (3216M) Metal Film ±0.1% 0.25W ±25ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
New
RS Stock No. 179-7123
Mfr. Part No.ERJ1GNF1000C
BrandPanasonic
€0.017
Each (On a Reel of 1000)
units
100Ω 0201 (0603M) Thick Film ±1% 0.05W ±200ppm/°C AEC-Q200 - - - - ERJ1G -55°C +125°C
RS Stock No. 168-8255
Mfr. Part No.MMB02070C1803FB200
BrandVishay
€150.29
1 Reel of 2000
Reel(s)
180kΩ Melf 0207 Thin Film ±1% 0.4W ±50ppm/K AEC-Q200 - - - - MMB -55°C +125°C
RS Stock No. 169-4234
Mfr. Part No.CRCW0603130RFKEA
BrandVishay
€53.68
1 Reel of 5000
Reel(s)
130Ω 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 701-4564
Mfr. Part No.CPF0402B115RE1
€0.084
Each (In a Pack of 10)
units
115Ω 0402 (1005M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 722-0052
Mfr. Part No.ERJP08F8203V
BrandPanasonic
€0.238
Each (In a Pack of 5)
units
820kΩ 1206 (3216M) Thick Film ±1% 0.66W ±100ppm/°C AEC-Q200 - - - - ERJP08 -55°C +155°C
RS Stock No. 172-8167
Mfr. Part No.MMU01020C1431FB300
BrandVishay
€0.027
Each (On a Reel of 3000)
units
1.43kΩ Melf 0102 Thin Film ±1% 0.3W ±50ppm/K - - - - - MMU0102 -55°C +155°C
New
RS Stock No. 186-5821
Mfr. Part No.350268RFT
€0.158
Each (On a Reel of 2000)
units
68Ω 2010 (5025M) Thick Film ±1% 2W ±100ppm/°C - - - - - 3502 -55°C +155°C
RS Stock No. 614-5250
Mfr. Part No.RN73C2A56R2B
€0.224
Each (In a Pack of 5)
units
56.2Ω 0805 (2012M) Thin Film ±0.1% 0.1W ±10ppm/°C - - - - - RN73 -55°C +125°C
RS Stock No. 708-6843
Mfr. Part No.ERA6AEB2493V
BrandPanasonic
€0.29
Each (In a Pack of 5)
units
249kΩ 0805 (2012M) Metal Film ±0.1% 0.125W ±25ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
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