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. 901-3793
Mfr. Part No.MCR25JZHF3001
BrandROHM
TWD3.60
Each (In a Bag of 50)
units
3 kΩ 1210 (3225M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 678-9768
Mfr. Part No.CRCW0603140KFKEA
BrandVishay
TWD1.30
Each (In a Pack of 50)
units
140 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 810-1669
Mfr. Part No.ERJ6RBD1000V
BrandPanasonic
TWD2.00
Each (In a Bag of 100)
units
100 Ω 0805 (2012M) Thick Film ±0.5% 0.1W ±50ppm/°C AEC-Q200 - - - - ERJ -55°C +125°C
RS Stock No. 169-0931
Mfr. Part No.ERJ6RBD5101V
BrandPanasonic
TWD0.70
Each (On a Reel of 5000)
units
5.1 kΩ 0805 (2012M) Thick Film ±0.5% 0.1W ±50ppm/°C AEC-Q200 - - - - ERJ -55°C +125°C
RS Stock No. 172-7732
Mfr. Part No.CRHV1206AF100MFKET
BrandVishay
TWD81.30
Each (On a Reel of 250)
units
100 MΩ 1206 (3216M) Thick Film ±1% 0.3W ±100ppm/°C - - - - - CRHV -55°C +150°C
RS Stock No. 167-4784
Mfr. Part No.CR0402-J/-000GLF
BrandBourns
TWD0.10
Each (On a Reel of 10000)
units
0 Ω 0402 (1005M) Thick Film ±5% 0.063W -250 → +500ppm/°C - - - - - CR0402 -55°C +125°C
RS Stock No. 123-9172
Mfr. Part No.CPF0603B24R9E1
TWD4.60
Each (On a Reel of 1000)
units
24.9 Ω 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 901-3689
Mfr. Part No.MCR10EZPF1000
BrandROHM
TWD0.60
Each (In a Bag of 100)
units
100 Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 122-8752
Mfr. Part No.CPF0603B24R9E1
TWD16.50
Each (In a Bag of 20)
units
24.9 Ω 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +155°C
RS Stock No. 213-2266
Mfr. Part No.CRG0603F1K0
TWD0.20
Each (In a Pack of 50)
units
1 kΩ 0603 Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 169-4932
Mfr. Part No.CRCW120651K1FKEA
BrandVishay
TWD0.30
Each (On a Reel of 5000)
units
51.1 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 172-4204
Mfr. Part No.ERJPA3F1001V
BrandPanasonic
TWD0.60
Each (On a Reel of 5000)
units
1 kΩ 0603 (1608M) Thick Film ±1% 0.25W ±100ppm/°C AEC-Q200 - - - - ERJPA3 -55°C +155°C
RS Stock No. 901-3601
Mfr. Part No.MCR03EZPFX1002
BrandROHM
TWD1.70
Each (In a Bag of 100)
units
10 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 901-3667
Mfr. Part No.MCR03EZPFX1004
BrandROHM
TWD1.90
Each (In a Bag of 100)
units
1 MΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 167-4793
Mfr. Part No.CR0805-FX-2700GLF
BrandBourns
TWD0.40
Each (On a Reel of 10000)
units
270 Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CR0805 -55°C +155°C
RS Stock No. 819-8764
Mfr. Part No.CRHV2512AF100MFKET
BrandVishay
TWD140.00
Each
units
100 MΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - CRHV -55°C +150°C
RS Stock No. 922-6002
Mfr. Part No.ERJ8BQF3R9V
BrandPanasonic
TWD1.90
Each (On a Reel of 5000)
units
3.9 Ω 1206 (3216M) Thick Film ±1% 0.5W ±200ppm/°C - - - - - ERJ8BQ -55°C +125°C
RS Stock No. 168-9008
Mfr. Part No.ERA6AEB123V
BrandPanasonic
TWD1.30
Each (On a Reel of 5000)
units
12 kΩ 0805 (2012M) Metal Film ±0.1% 0.125W ±25ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
RS Stock No. 901-3610
Mfr. Part No.MCR03EZPFX2002
BrandROHM
TWD1.90
Each (In a Bag of 100)
units
20 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - MCR -55°C +155°C
RS Stock No. 740-8789
Mfr. Part No.CR0402-J/-000GLF
BrandBourns
TWD0.40
Each (In a Pack of 50)
units
0 Ω 0402 (1005M) Thick Film ±5% 0.063W -250 → +500ppm/°C - - - - - CR0402 -55°C +125°C