Specifications are subject to change without notice.

The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time.

Users should verify actual device performance in their specific applications.

FWxxA Series Fusible Power Resistors

Performance Specifications

Characteristic

Limits

Test Method

(JIS-C-5201 & JIS-C-5202)

Temperature Coefficient

±200 PPM/°C max.

4.8 Natural resistance changes per temperature (°C):

Short Time Overload

Resistance change rate is ±5 % max., with

no evidence of mechanical damage.

4.13 Permanent resistance change after the application of a

potential of 2.5 times RCWV for 5 seconds.

Terminal Strength

No evidence of mechanical damage.

4.16 Direct Load:

Resistance to a 2.5 kg direct load for 10 seconds in the

direction of the longitudinal axis of the terminal leads.

Twist Test:

Terminal leads shall be bent through 90 ° at a point of

approximately 6 mm from the body of the resistor and

shall be rotated through 360 ° (about the original axis of

the bent terminal) in alternating directions for a total of

three rotations.

Resistance to Soldering Heat

Resistance change rate is ±1 % max., with

no evidence of mechanical damage.

4.18 Permanent resistance change when leads are immersed

to a point 2.0 to 2.5 mm from the body in 260 °C (±5 °C)

solder for 10 (±1) seconds.

Solderability

95 % coverage minimum

4.17 The area covered with a new, smooth, clean, shiny and

continuous surface free from concentrated pinholes.

Test temp. of solder: 245 °C (±3 °C).

Dwell time in solder: 2~3 seconds.

Load Life in Humidity

Resistance change rate is ±5 % max., with

no evidence of mechanical damage.

7.9 Resistance change after 1,000 hours (1.5 hours “ON”,

0.5 hours “OFF”) at RCWV in a humidity test chamber

controlled at 40 °C (±2 °C) and 90-95 % relative humidity.

Safety Fuse

Resistance value shall increase at least

100 times initial value.

1 W ~ 5 W: Load 120/240 VAC voltage.

7 W:

Load 240 VAC voltage.

Resistor must be safely fused.

Dielectric Withstanding

Voltage

No evidence of flashover mechanical

damage, arcing or insulation breakdown.

UL1412,

19.1 A resistor (or a resistor and its mounting if provided),

shall withstand, without breakdown, for a period of not

less than one minute, a 60 Hz potential of 1000 V plus

twice the rated voltage applied between live parts and

dead metal parts, if any.

1st Significant Figure

2nd Significant Figure

3rd Significant Figure

Multiplier

Tolerance

Typical Part Marking

Color

1st Band

2nd Band

3rd band

Multiplier

Tolerance

Black

0

0

0

1 Ω

Brown

1

1

1

10 Ω

±1 %

Red

2

2

2

100 Ω

±2 %

Orange

3

3

3

1 KΩ

Yellow

4

4

4

10 KΩ

Green

5

5

5

100 KΩ

±0.5 %

Blue

6

6

6

1 MΩ

±0.25 %

Violet

7

7

7

10 MΩ

±0.10 %

Grey

8

8

8

±0.05 %

White

9

9

9

Gold

0.1 Ω

±5 %

Silver

0.01 Ω

±10 %