Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.

12/30/10

155

KOA Speer Electronics, Inc. • 199 Bolivar Drive • Bradford, PA 16701 • USA • 814-362-5536 • Fax: 814-362-8883 • www.koaspeer.com

RF

coat-insulated fusing resistor

Performance Characteristics

environmental applications

Fusing Characteristics

Derating Curve

100

80

60

40

20

0

-40 -20

020406080 100 120 140

70

160

155

Ambient Temperature

(°C)

For resistors operated at an ambient temperature of 70°C or above, a power

rating shall be derated in accordance with derating curve on the left.

Performance Requirements

Test Items

∆

R± (% +0.05

Ω)

Test Methods

Limit

Typical

Resistance

Within specified

—

25°C

tolerance

T.C.R.

Within specified T.C.R.

—

Room temperature +100°C

Overload (Short Time)

1%

0.5%

Rated voltage × 2.5 for 5 seconds

Resistance to

1%

0.5%

350°C ± 10°C, 3.5s ± 0.5s or 260°C ± 5°C, 10s ± 1s

Soldering Heat

Rapid Change

1%

0.5%

−40°C (30 min.)/ +85°C (30 min.) 5 cycles

of Temperature

Moisture Resistance

5%

2.5%

40°C ±2°C, 90% - 95% RH, 1000 hours

1.5h ON / 0.5h OFF cycle

Endurance at 70°C

5%

2.5%

70°C ± 2°C, 1000 hours

1.5h ON / 0.5h OFF cycle

Resistance to Solvent

No abnormality in

—

The resistor shall be immersed in IPA for 30 sec.

appearance. Marking

shall be easily legible.

Flame retardant

No evidence of flaming

—

Flame test : The test flame shall be applied and removed

or self-flaming.

for each 15 sec respsctively to repeat the cycle 5 times.

Overload flame retardant: Power corresponding to 2, 4, 8, 16

and 32 times the power rating shall be applied for each 1min.

until disconnection occurs.

100

×5

×10 ×15 ×20

×5

×10 ×15 ×20

×5

×10 ×15 ×20

×5

×10 ×15 ×20

×5

×10 ×15 ×20

60

30

10

6

3

1

Magnification of Power Rating

RF16 10

RF25 10

RF50 10

RF1 10

RF2 10