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 (PCBs).

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. 123-4396
Mfr. Part No.RK73H2ETTD1500F
BrandKOA
€0.032
Each (In a Bag of 50)
units
150 Ω 1210 (3225M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4453
Mfr. Part No.RK73HW2HTTE4701F
BrandKOA
€0.15
Each (In a Bag of 50)
units
4.7 kΩ 2010 (5025M) Thick Film ±1% 0.75W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4326
Mfr. Part No.RK73H1JTTD49R9F
BrandKOA
€0.002
Each (In a Bag of 50)
units
49.9 Ω 0603 (1608M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 123-4328
Mfr. Part No.RK73H1JTTD4991F
BrandKOA
€0.083
Each (In a Bag of 50)
units
4.99 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6787
Mfr. Part No.WK73S2HTTER470F
BrandKOA
€0.12
Each (On a Reel of 4000)
units
470 mΩ 1020 Thick Film ±1% 1W ±100ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 123-4329
Mfr. Part No.RK73H1JTTD4992F
BrandKOA
€0.083
Each (In a Bag of 50)
units
49.9 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6945
Mfr. Part No.WK73S2BTTDR100F
BrandKOA
€0.118
Each (On a Reel of 250)
units
100 mΩ 0612 (1632M) Thick Film ±1% 0.75W ±200ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 179-1482
Mfr. Part No.RS73F1JTTD1802B
BrandKOA
€0.055
Each (On a Reel of 500)
units
18 kΩ 0603 (1608M) Thick Film ±0.1% 0.2W ±25ppm/°C AEC-Q200 - - - - RS73 -55°C +155°C
RS Stock No. 187-7908
Mfr. Part No.RN73H1JTTD4701B25
BrandKOA
€0.073
Each (On a Reel of 250)
units
- - - - - - - - - - - - - -
RS Stock No. 123-4497
Mfr. Part No.RK73HW3ATTE5101F
BrandKOA
€0.203
Each (In a Bag of 50)
units
5.1 kΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6429
Mfr. Part No.SG73G2BTTD10R0D
BrandKOA
€0.059
Each (On a Reel of 500)
units
10 Ω 1206 (3216M) Thick Film ±0.5% 0.5W ±50ppm/°C AEC-Q200 - - - - SG73G -55°C +155°C
RS Stock No. 123-4330
Mfr. Part No.RK73H2ATTD49R9F
BrandKOA
€0.083
Each (In a Bag of 50)
units
49.9 Ω 0805 (2012M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - RK73H -55°C +155°C
RS Stock No. 178-6788
Mfr. Part No.WK73S2HTTER680F
BrandKOA
€0.086
Each (On a Reel of 4000)
units
680 mΩ 1020 Thick Film ±1% 1W ±100ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 178-6946
Mfr. Part No.WK73S2HTTE3R30F
BrandKOA
€0.111
Each (On a Reel of 250)
units
3.3 Ω 1020 Thick Film ±1% 1W ±100ppm/°C AEC-Q200 - - - - WK73S -55°C +155°C
RS Stock No. 178-6386
Mfr. Part No.SG73G2ATTD47R0D
BrandKOA
€0.048
Each (On a Reel of 500)
units
47 Ω 0805 (2012M) Thick Film ±0.5% 0.5W ±50ppm/°C AEC-Q200 - - - - SG73G -55°C +155°C
RS Stock No. 178-6263
Mfr. Part No.TLR2HDTE1L00F75
BrandKOA
€0.338
Each (On a Reel of 4000)
units
1 mΩ 2010 (5025M) Metal Strip ±1% 1W ±75ppm/°C AEC-Q200 - - - - TLR-2H -65°C +170°C
RS Stock No. 182-6074
Mfr. Part No.SL2TTE10L0F
BrandKOA
€35.69
1 Pack of 50
Pack(s)
10 mΩ 4257 (11070M Metal Plate ±1% 2W ±180ppm/°C AEC-Q200 - - - - SL2 -55°C +180°C
RS Stock No. 179-0387
Mfr. Part No.RS73F1JTTD1202B
BrandKOA
€0.038
Each (On a Reel of 5000)
units
12 kΩ 0603 (1608M) Thick Film ±0.1% 0.2W ±25ppm/°C AEC-Q200 - - - - RS73 -55°C +155°C
RS Stock No. 178-6686
Mfr. Part No.SG73P2BTTD2R20F
BrandKOA
€0.04
Each (On a Reel of 5000)
units
2.2 Ω 1206 (3216M) Thick Film ±1% 0.75W ±200ppm/°C AEC-Q200 - - - - SG73P -55°C +155°C
RS Stock No. 178-6540
Mfr. Part No.UR73D2ATTD10L0F
BrandKOA
€0.132
Each (On a Reel of 500)
units
10 mΩ 0805 (2012M) Thick Film ±1% 0.33W ±250ppm/°C - - - - - UR73 -55°C +125°C