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. 567-045
Mfr. Part No.ERJM1WSF10MU
kr 5,962
Each (In a Pack of 5)
10 mΩ 2512 (6432M) Thick Film ±1% 1W ±100ppm/°C - - - - - ERJM1W -55°C +170°C
RS Stock No. 199-5799
Mfr. Part No.RC1206FR-071K3L
kr 0,389
Each (On a Tape of 100)
- 1206 (3216M) Thick Film ± 1% 0.25 W, 0.5 W - - - - - - - - -
RS Stock No. 106-8960
Mfr. Part No.ERA3AEB2102V
kr 0,342
Each (On a Reel of 5000)
21 kΩ 0603 (1608M) Metal Film ±0.1% 0.1W ±25ppm/°C - - - - - ERA -55°C +155°C
RS Stock No. 183-9968
kr 0,604
Each (On a Reel of 1000)
- - Thick Film ±5% - - - - - - - - - -
RS Stock No. 176-4300
Mfr. Part No.CRGP2010F680K
kr 0,708
Each (On a Reel of 4000)
680 kΩ 2010 (5025M) Thick Film ±1% 1.25W ±100ppm/°C - - - - - CRGP -55°C +155°C
RS Stock No. 114-2795
Mfr. Part No.ERJ6ENF18R2V
kr 0,098
Each (On a Reel of 5000)
18.2 Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - ERJ -55°C +155°C
RS Stock No. 186-5848
Mfr. Part No.3502300RFT
kr 2,018
Each (On a Reel of 2000)
300 Ω 2010 (5025M) Thick Film ±1% 2W ±100ppm/°C - - - - - 3502 -55°C +155°C
RS Stock No. 178-6329
Mfr. Part No.UR732BTTDR100F
kr 1,013
Each (On a Reel of 5000)
100 mΩ 1206 (3216M) Thick Film ±1% 0.5W ±100ppm/°C - - - - - UR73 -55°C +125°C
RS Stock No. 164-6725
Mfr. Part No.CRGS1206J1R5
kr 0,75
Each (On a Reel of 5000)
1.5 Ω 1206 (3216M) Thick Film ±5% 0.6W ≤±400ppm/°C - - - - - CRGS -55°C +155°C
RS Stock No. 171-2025
Mfr. Part No.ERA8AEB8061V
kr 1,172
Each (On a Reel of 5000)
8.06 kΩ 1206 (3216M) Metal Film ±0.1% 0.25W ±25ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
RS Stock No. 678-7312
Mfr. Part No.MMA02040C2702FB300
kr 0,439
Each (In a Pack of 25)
27 kΩ Melf 0204 Thin Film ±1% 0.25W ±50ppm/°C - - - - - MMA0204 -55°C +125°C
RS Stock No. 193-0140
Mfr. Part No.VMS-R050-1.0-U
kr 7,478
Each (On a Tape of 10)
50 mΩ 2512 (6432M) - 1% 3 W @ 95°C <20ppm/K AEC-Q200 - - - - VMS -65°C +170°C
RS Stock No. 763-3660
Mfr. Part No.ERJP03F2102V
kr 0,464
Each (On a Reel of 500)
21 kΩ 0603 (1608M) Thick Film ±1% 0.2W ±200ppm/°C AEC-Q200 - - - - ERJP03 -55°C +155°C
RS Stock No. 172-3961
Mfr. Part No.ERJP08F4303V
kr 0,198
Each (On a Reel of 5000)
430 kΩ 1206 (3216M) Thick Film ±1% 0.66W ±100ppm/°C AEC-Q200 - - - - ERJP08 -55°C +155°C
RS Stock No. 169-4441
Mfr. Part No.CRCW06035K49FKEA
kr 0,025
Each (On a Reel of 5000)
5.49 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 169-1431
Mfr. Part No.ERA3APB3402V
kr 1,621
Each (On a Reel of 5000)
34 kΩ 0603 (1608M) Metal Film ±0.1% 0.1W ±15ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
RS Stock No. 116-9333
Mfr. Part No.ERJ8ENF7502V
kr 0,101
Each (On a Reel of 5000)
75 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - ERJ -55°C +155°C
RS Stock No. 848-8865
Mfr. Part No.TNPW080524K9FHEA
kr 0,497
Each (In a Pack of 5000)
24.9 kΩ 0805 (2012M) Thin Film ±1% 0.125W ±50ppm/K - - - - - TNPW -55°C +125°C
RS Stock No. 134-6425
Mfr. Part No.KRL2012E-C-R100-F
BrandSusumu Co
kr 2,897
Each (In a Bag of 20)
100 mΩ 0805 (2012M) Metal Foil ±1% 1W ±50ppm/°C - - - - - KRL -55°C +175°C
RS Stock No. 840-5059
Mfr. Part No.ERA6APB1051V
kr 1,894
Each (In a Pack of 10)
1.05 kΩ 0805 (2012M) Metal Film ±0.1% 0.125W ±15ppm/°C AEC-Q200 - - - - ERA -55°C +155°C
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