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. 167-4485
Mfr. Part No.CRM2512-FX-R100ELF
BrandBourns
MYR1.536
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. 134-5452
Mfr. Part No.CRG0603F330K
MYR169.54
1 Reel of 5000
Reel(s)
330 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 213-2604
Mfr. Part No.CRG0603F330K
MYR0.143
Each (In a Pack of 50)
units
330 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 720-3215
Mfr. Part No.CRM2512-FX-R100ELF
BrandBourns
MYR1.944
Each (In a Pack of 5)
units
100 mΩ 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 802-9539
BrandRS PRO
MYR121.25
1 Reel of 5000
Reel(s)
100 Ω 0603 (1608M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - - -55°C +155°C
RS Stock No. 788-3990
Mfr. Part No.CR0402-FX-1002GLF
BrandBourns
MYR0.12
Each (In a Pack of 50)
units
10 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CR0402 -55°C +125°C
RS Stock No. 134-5495
Mfr. Part No.CRG0805F100K
MYR142.41
1 Reel of 5000
Reel(s)
100 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 223-0691
Mfr. Part No.CRG0805F100K
MYR0.077
Each (In a Pack of 50)
units
100 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. 167-5187
Mfr. Part No.CR0402-FX-1002GLF
BrandBourns
MYR0.081
Each (On a Reel of 10000)
units
10 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CR0402 -55°C +125°C
RS Stock No. 122-9653
Mfr. Part No.CPF0603B866KE1
MYR1.39
Each (In a Bag of 20)
units
866 kΩ 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 922-9216
Mfr. Part No.ERJT14J33RU
BrandPanasonic
MYR1,848.96
1 Reel of 5000
Reel(s)
33 Ω 1210 (3225M) Thick Film ±5% 0.5W ±200ppm/°C - - - - - ERJT14 -55°C +155°C
RS Stock No. 106-7108
Mfr. Part No.ERJ6ENF1002V
BrandPanasonic
MYR304.18
1 Reel of 5000
Reel(s)
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C AEC-Q200 - - - - ERJ6EN -55°C +155°C
RS Stock No. 123-9886
Mfr. Part No.CPF0603B866KE1
MYR0.848
Each (On a Reel of 1000)
units
866 kΩ 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 721-9292
Mfr. Part No.ERJT14J33RU
BrandPanasonic
MYR1.074
Each (In a Pack of 5)
units
33 Ω 1210 (3225M) Thick Film ±5% 0.5W ±200ppm/°C AEC-Q200 - - - - ERJT14 -55°C +155°C
RS Stock No. 754-2624
Mfr. Part No.TL3AR075FTDG
MYR4.126
Each (In a Pack of 5)
units
75 mΩ 2512 (6432M) Metal Strip ±1% 1W ±75ppm/°C - - - - - TLA3A -65°C +170°C
RS Stock No. 732-6031
Mfr. Part No.ERJ6ENF1002V
BrandPanasonic
MYR277.37
1 Reel of 5000
Reel(s)
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - ERJ6EN -55°C +155°C
RS Stock No. 865-4286
Mfr. Part No.ERJU06F1601V
BrandPanasonic
MYR0.252
Each (In a Bag of 100)
units
1.6 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - ERJ -55°C +155°C
RS Stock No. 161-4466
Mfr. Part No.35205R6JT
MYR1,112.18
1 Reel of 4000
Reel(s)
5.6 Ω 2512 (6432M) Thick Film ±5% 1W ±350ppm/°C - - - - - 3520 -55°C +125°C
RS Stock No. 901-3440
Mfr. Part No.MCR01MZPF1002
BrandROHM
MYR0.196
Each (In a Bag of 100)
units
10 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 167-4479
Mfr. Part No.CRA2512-FZ-R100ELF
BrandBourns
MYR1.024
Each (On a Reel of 4000)
units
100 mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
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