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. 167-5434
Mfr. Part No.CRL1206-FW-R750ELF
BrandBourns
MYR0.147
Each (On a Reel of 5000)
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750 mΩ 1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 740-9192
Mfr. Part No.CRL1206-FW-R750ELF
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MYR0.421
Each (In a Pack of 50)
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750 mΩ 1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 720-3215
Mfr. Part No.CRM2512-FX-R100ELF
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MYR5.414
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
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MYR1.70
Each (On a Reel of 4000)
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100 mΩ 2512 (6432M) Thick Film ±1% 2W ±100ppm/°C - - - - - CRM -55°C +155°C
RS Stock No. 788-3990
Mfr. Part No.CR0402-FX-1002GLF
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MYR0.192
Each (In a Pack of 50)
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10 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CR0402 -55°C +125°C
RS Stock No. 167-5187
Mfr. Part No.CR0402-FX-1002GLF
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MYR0.076
Each (On a Reel of 10000)
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10 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CR0402 -55°C +125°C
RS Stock No. 167-4479
Mfr. Part No.CRA2512-FZ-R100ELF
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MYR1.254
Each (On a Reel of 4000)
units
100 mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 693-4394
Mfr. Part No.CRA2512-FZ-R100ELF
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MYR2.194
Each (In a Pack of 5)
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100 mΩ 2512 (6432M) Metal Strip ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 794-4238
Mfr. Part No.CRL1206-JW-R100ELF
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MYR0.81
Each (In a Pack of 10)
units
100 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 167-5163
Mfr. Part No.CRL1206-JW-R100ELF
BrandBourns
MYR0.177
Each (On a Reel of 5000)
units
100 mΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 794-4219
Mfr. Part No.CRL1206-FW-R240ELF
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MYR0.818
Each (In a Pack of 10)
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240 mΩ 1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 167-5159
Mfr. Part No.CRL1206-FW-R240ELF
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MYR0.269
Each (On a Reel of 5000)
units
240 mΩ 1206 (3216M) Thick Film ±1% 0.25W ±200ppm/°C - - - - - CRL -55°C +125°C
RS Stock No. 162-2543
Mfr. Part No.CR1206-JW-102GLF
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MYR0.046
Each (On a Reel of 10000)
units
1 kΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - CR1206 -55°C +155°C
RS Stock No. 740-9117
Mfr. Part No.CR1206-JW-102GLF
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MYR0.327
Each (In a Pack of 50)
units
1 kΩ 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C - - - - - CR1206 -55°C +155°C
RS Stock No. 740-8975
Mfr. Part No.CR0805-FX-1002GLF
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MYR0.424
Each (In a Pack of 50)
units
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 167-4789
Mfr. Part No.CR0805-FX-1002GLF
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MYR0.045
Each (On a Reel of 10000)
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10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 740-9063
Mfr. Part No.CR0805-JW-102ELF
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MYR0.051
Each (In a Pack of 50)
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1 kΩ 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 867-3022
Mfr. Part No.CRS2512-FW-3R30ELF
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MYR2.763
Each (In a Bag of 10)
units
3.3 Ω 2512 (6432M) Thick Film ±1% 2W ±200ppm/°C - - - - - CRS -55°C +150°C
RS Stock No. 167-4480
Mfr. Part No.CRA2512-FZ-R050ELF
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MYR1.254
Each (On a Reel of 4000)
units
50 mΩ 2512 (6432M) - ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 167-4486
Mfr. Part No.CRM2512-JW-100ELF
BrandBourns
MYR0.324
Each (On a Reel of 4000)
units
10 Ω 2512 (6432M) Thick Film ±5% 2W ±200ppm/°C - - - - - CRM -55°C +155°C