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. 164-6470
Mfr. Part No.TLM3ADR020FTE
€0.21
Each (On a Reel of 4000)
units
20 mΩ 2512 (6432M) Metal Foil ±1% 1W ±50ppm/°C - - - - - TLM -55°C ++55°°C
RS Stock No. 824-0326
Mfr. Part No.CRE2512-FZ-R001E-3
BrandBourns
€0.652
Each (In a Bag of 10)
units
1 mΩ 2512 (6432M) Metal Strip ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRE -55°C +170°C
RS Stock No. 869-5485
Mfr. Part No.TLM3ADR020FTE
€0.495
Each (In a Bag of 10)
units
20 mΩ 2512 (6432M) Metal Strip ±1% 1W ±50ppm/°C - - - - - TLM -55°C ++55°°C
RS Stock No. 717-1578
BrandRS PRO
€0.008
Each (On a Reel of 5000)
units
0 Ω 0805 (2012M) Thick Film ±5% 0.125W ±200ppm/°C - - - - - RS -55°C +155°C
RS Stock No. 223-0691
Mfr. Part No.CRG0805F100K
€0.008
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. 666-2092
Mfr. Part No.CPF0603B4K7E
€0.216
Each (In a Pack of 5)
units
4.7 kΩ 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +125°C
RS Stock No. 168-9297
Mfr. Part No.ERA6ARB8871V
BrandPanasonic
€0.18
Each (On a Reel of 5000)
units
8.87 kΩ 0805 (2012M) Metal Film ±0.1% 0.125W ±10ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
RS Stock No. 180-4473
Mfr. Part No.MMB02070C8202FB200
BrandVishay
€0.133
Each (On a Reel of 500)
units
82 kΩ Melf 0207 Thin Film ±1% 0.4W ±50ppm/K AEC-Q200 - - - - MMB -55°C +125°C
RS Stock No. 181-9075
Mfr. Part No.CRCW040233K0FKEDHP
BrandVishay
€0.012
Each (On a Reel of 10000)
units
33 kΩ 0402 (1005M) Thick Film ±1% 0.2W ±100ppm/K AEC-Q200 - - - - CRCW-HP e3 -55°C +155°C
RS Stock No. 164-0403
Mfr. Part No.CPF0603B4K7E
€0.107
Each (On a Reel of 1000)
units
4.7 kΩ 0603 (1608M) Thin Film ±0.1% 0.063W ±25ppm/°C - - - - - CPF -55°C +125°C
RS Stock No. 122-3640
Mfr. Part No.ERA2AEB4021X
BrandPanasonic
€0.028
Each (On a Reel of 10000)
units
4.02 kΩ 0402 (1005M) Metal Film ±0.1% 0.063W ±25ppm/°C - - - - - ERA -55°C +155°C
RS Stock No. 812-1653
Mfr. Part No.CRCW040233K0FKEDHP
BrandVishay
€0.076
Each (In a Bag of 100)
units
33 kΩ 0402 (1005M) Thick Film ±1% 0.2W ±100ppm/K - - - - - CRCW -55°C +155°C
RS Stock No. 684-1475
Mfr. Part No.Y1624500R000T9R
€21.70
Each
units
500 Ω 0805 (2012M) Metal Foil ±0.01% 0.2W ±0.2ppm/°C - - - - - VSMP -55°C +125°C
RS Stock No. 173-2967
Mfr. Part No.Y16291K00000T9R
€15.788
Each (On a Tape of 25)
units
1 kΩ 0805 (2012M) Metal Foil ±0.01% 0.1W ±0.2ppm/°C - - - - - VFCP -55°C +125°C
RS Stock No. 164-6201
Mfr. Part No.352230RFT
€0.255
Each (On a Reel of 2000)
units
30 Ω 2512 (6432M) Thick Film ±1% 3W - - - - - - 3522 -55°C +155°C
RS Stock No. 182-5102
Mfr. Part No.CRCW0805510RFKEA
BrandVishay
€0.008
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 678-9374
Mfr. Part No.CRCW040249K9FKED
BrandVishay
€0.01
Each (In a Pack of 50)
units
49.9 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 104-5429
Mfr. Part No.ERA2AEB4021X
BrandPanasonic
€0.10
Each (In a Bag of 50)
units
4.02 kΩ 0402 (1005M) Metal Film ±0.1% 0.063W ±25ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
RS Stock No. 182-3699
Mfr. Part No.CRCW040249K9FKED
BrandVishay
€0.005
Each (On a Reel of 1000)
units
49.9 kΩ 0402 (1005M) Thick Film ±1% 0.063W ±100ppm/K AEC-Q200 - - - - CRCW -55°C +155°C
RS Stock No. 180-4190
Mfr. Part No.MMB02070C8202FB200
BrandVishay
€0.035
Each (On a Reel of 2000)
units
82 kΩ Melf 0207 Thin Film ±1% 0.4W ±50ppm/K AEC-Q200 - - - - MMB -55°C +125°C