Yageo Fixed Resistors 2,400+

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Part RoHS Manufacturer Resistor Type Mounting Type Resistance Rated Power Dissipation (P) Maximum Operating Temperature Tolerance Diameter (Lead) Spacing (Lead) Rated Temperature No. of Functions Technology Shape (Package) No. of Elements Construction Packing Method Size Code Network Type No. of Terminals Package Style (Meter) Terminal Shape Sub-Category Dimensions First Element Resistance Minimum Operating Temperature Temperature Coef (ppm/Cel) Terminal Finish Length (Lead) Height (Package) Manufacturer Series Operating Voltage Additional Features Length (Package) JESD-609 Code Series Diameter (Package) Reference Standard Width (Package)

RC1206FR-0715KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

15000 ohm

.25 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

200 V

LASER TRIMMABLE

3.1 mm

e3

1.6 mm

RC1206FR-07220KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

220000 ohm

.25 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

200 V

LASER TRIMMABLE

3.1 mm

e3

1.6 mm

RL1206FR-070R1L

Yageo

FIXED RESISTOR

SURFACE MOUNT

.1 ohm

.25 W

125 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Chip

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

FIXED RESISTOR

-55 Cel

600

MATTE TIN OVER NICKEL

.55 mm

LASER TRIMMABLE

3.1 mm

e3

AEC-Q200

1.6 mm

MFR-25FBF52-1K62

Yageo

FIXED RESISTOR

THROUGH HOLE MOUNT

1620 ohm

.25 W

155 Cel

1 %

.55 mm

70 Cel

METAL FILM

CYLINDRICAL PACKAGE

Tubular

Bulk

2

Axial

WIRE

Fixed Resistors

-55 Cel

100

Matte Tin (Sn)

28 mm

250 V

6.3 mm

e3

2.4 mm

AEC-Q200

RC0603FR-073.9RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

3.9 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

TR, PAPER, 7 INCH

0603

2

WRAPAROUND

-55 Cel

200

Matte Tin (Sn) - with Nickel (Ni) barrier

50 V

LASER TRIMMABLE

e3

RC0603FR-0739RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

39 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RT0603FRE07100KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

100000 ohm

.1 W

155 Cel

1 %

70 Cel

THIN FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

50

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

HIGH PRECISION, LASER TRIMMABLE

1.6 mm

e3

.8 mm

RC0402FR-0712K4L

Yageo

FIXED RESISTOR

SURFACE MOUNT

12400 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.35 mm

50 V

LASER TRIMMABLE

1 mm

e3

.5 mm

RC0805FR-071K1L

Yageo

FIXED RESISTOR

SURFACE MOUNT

1100 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

RC0603FR-133K3L

Yageo

FIXED RESISTOR

SURFACE MOUNT

3300 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 13 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

AC0603FR-0710RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

10 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

RC0402FR-07147KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

147000 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.35 mm

50 V

LASER TRIMMABLE

1 mm

e3

.5 mm

RC0402FR-076.8RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

6.8 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

TR, PAPER, 7 INCH

0402

2

WRAPAROUND

-55 Cel

200

Matte Tin (Sn) - with Nickel (Ni) barrier

50 V

LASER TRIMMABLE

e3

RC0402FR-0768RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

68 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.35 mm

50 V

LASER TRIMMABLE

1 mm

e3

.5 mm

RC0603FR-07210KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

210000 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RC0805FR-0710ML

Yageo

FIXED RESISTOR

SURFACE MOUNT

10000000 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

RC1206FR-074R7L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4.7 ohm

.25 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

-55 Cel

200

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

200 V

LASER TRIMMABLE

3.1 mm

e3

1.6 mm

RC0603FR-107K5L

Yageo

FIXED RESISTOR

SURFACE MOUNT

7500 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 10 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RT0603FRE07100RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

100 ohm

.1 W

155 Cel

1 %

70 Cel

THIN FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

50

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

HIGH PRECISION, LASER TRIMMABLE

1.6 mm

e3

.8 mm

AC0402FR-071ML

Yageo

FIXED RESISTOR

SURFACE MOUNT

1000000 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.32 mm

50 V

LASER TRIMMABLE

1 mm

e3

AEC-Q200

.5 mm

RC0805FR-075K6L

Yageo

FIXED RESISTOR

SURFACE MOUNT

5600 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

RC0603FR-07560KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

560000 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RL1206JR-070R27L

Yageo

FIXED RESISTOR

SURFACE MOUNT

.27 ohm

.25 W

125 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Chip

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

FIXED RESISTOR

-55 Cel

600

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

LASER TRIMMABLE

3.1 mm

e3

AEC-Q200

1.6 mm

MF0207FTE52-10K

Yageo

FIXED RESISTOR

THROUGH HOLE MOUNT

10000 ohm

.6 W

155 Cel

1 %

.55 mm

70 Cel

METAL FILM

TUBULAR PACKAGE

Tubular

AMMO PACK

2

Axial

WIRE

FIXED RESISTOR

-55 Cel

50

Matte Tin (Sn)

350 V

6.3 mm

e3

2.4 mm

AEC-Q200

RC0402FR-072K4L

Yageo

FIXED RESISTOR

SURFACE MOUNT

2400 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.35 mm

50 V

LASER TRIMMABLE

1 mm

e3

.5 mm

RC0805FR-07470KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

470000 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

RC1206JR-07100KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

100000 ohm

.25 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

1206

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

200 V

LASER TRIMMABLE

3.1 mm

e3

1.6 mm

RL2512FK-070R1L

Yageo

FIXED RESISTOR

SURFACE MOUNT

.1 ohm

1 W

125 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Chip

TR, EMBOSSED, 7 INCH

2512

2

SMT

WRAPAROUND

FIXED RESISTOR

-55 Cel

600

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

LASER TRIMMABLE

6.35 mm

e3

AEC-Q200

3.2 mm

RT0805BRD074K75L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4750 ohm

.125 W

155 Cel

.1 %

70 Cel

THIN FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

25

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

HIGH PRECISION, LASER TRIMMABLE

2 mm

e3

1.25 mm

AC0201JR-070RL

Yageo

JUMPER

SURFACE MOUNT

0 ohm

.05 W

155 Cel

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0201

2

SMT

WRAPAROUND

-55 Cel

MATTE TIN OVER NICKEL

.23 mm

LASER TRIMMABLE, RATED CURRENT: 0.5A

.6 mm

AEC-Q200

.3 mm

AC0603FR-134K7L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4700 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 13 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

AF0603FR-07120RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

120 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

ANTI-SULFUR, LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

RC0603FR-1075RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

75 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 10 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

MATTE TIN OVER NICKEL

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RC0805JR-0768KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

68000 ohm

.125 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

AC0603FR-071K5L

Yageo

FIXED RESISTOR

SURFACE MOUNT

1500 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

AF0603JR-074K3L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4300 ohm

.1 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

ANTI-SULFUR, LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

RC0402FR-0736K5L

Yageo

FIXED RESISTOR

SURFACE MOUNT

36500 ohm

.0625 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0402

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.35 mm

50 V

LASER TRIMMABLE

1 mm

e3

.5 mm

RC0805FR-074R7L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4.7 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

200

MATTE TIN OVER NICKEL

.5 mm

150 V

LASER TRIMMABLE

2 mm

e3

1.25 mm

RC1210JR-070RL

Yageo

JUMPER

SURFACE MOUNT

0 ohm

.5 W

155 Cel

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

1210

2

SMT

WRAPAROUND

-55 Cel

Matte Tin (Sn) - with Nickel (Ni) barrier

.55 mm

LASER TRIMMABLE, RATED CURRENT: 2A

3.1 mm

e3

2.6 mm

AC0603JR-0710KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

10000 ohm

.1 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

AEC-Q200

.8 mm

RC0603FR-076.2RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

6.2 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

TR, PAPER, 7 INCH

0603

2

WRAPAROUND

Fixed Resistors

-55 Cel

200

Matte Tin (Sn) - with Nickel (Ni) barrier

RC

50 V

LASER TRIMMABLE

e3

RC0603FR-0762RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

62 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RC0603JR-134K3L

Yageo

FIXED RESISTOR

SURFACE MOUNT

4300 ohm

.1 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 13 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

AF0805FR-0710RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

10 ohm

.125 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Rectangular

TR, PAPER, 7 INCH

0805

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.5 mm

150 V

ANTI-SULFUR, LASER TRIMMABLE

2 mm

e3

AEC-Q200

1.25 mm

RC0201FR-07200RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

200 ohm

.05 W

125 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0201

2

SMT

WRAPAROUND

-55 Cel

200

Matte Tin (Sn) - with Nickel (Ni) barrier

.23 mm

25 V

LASER TRIMMABLE

.6 mm

e3

.3 mm

RC0603FR-10750RL

Yageo

FIXED RESISTOR

SURFACE MOUNT

750 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 10 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

232270468202

Yageo

FIXED RESISTOR

SURFACE MOUNT

8200 ohm

.1 W

155 Cel

1 %

70 Cel

METAL GLAZE/THICK FILM

RECTANGULAR PACKAGE

Chip

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

Fixed Resistors

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

RC0603JR-0733KL

Yageo

FIXED RESISTOR

SURFACE MOUNT

33000 ohm

.1 W

155 Cel

5 %

70 Cel

METAL GLAZE/THICK FILM

Rectangular

TR, PAPER, 7 INCH

0603

2

SMT

WRAPAROUND

-55 Cel

100

Matte Tin (Sn) - with Nickel (Ni) barrier

.45 mm

75 V

LASER TRIMMABLE

1.6 mm

e3

.8 mm

Fixed Resistors

Fixed resistors are passive electronic components that are used to resist the flow of electric current in a circuit. They have a fixed value of resistance, meaning their resistance cannot be adjusted once they are manufactured. They are commonly used to set the bias of transistors, control the gain of amplifiers, or limit the current flowing through an LED. Fixed resistors come in various sizes, power ratings, and tolerances.

There are two types of fixed resistors: through-hole and surface mount. Through-hole resistors have leads that are inserted into holes on the printed circuit board (PCB), while surface mount resistors have terminals that are soldered directly to the surface of the PCB. Through-hole resistors are larger and easier to work with, but surface mount resistors are smaller and more suitable for miniaturized electronic devices.

Fixed resistors can be made from a variety of materials, including carbon, metal, and wire-wound. Carbon resistors are inexpensive and widely used, but they have a lower tolerance and are more susceptible to noise than other types. Metal film resistors have a higher tolerance and better stability, making them ideal for use in precision circuits. Wire-wound resistors have a higher power rating and are used in high power applications, such as power supplies and amplifiers.