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SMW

POWER WIRE WOUND CHIP RESISTORS

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APPLICATIONS

-consumer electronics
-computers
-telecommunications
-use in control instruments

CHARACTERISTICS

Temperature Coefficient

 

200ppm/c

Rated
Load

within.[1%]

rated power for 30 minutes continuously
normal condition for 30 minutes

Short Time
Over Load

within.[1%]

5 x Power rating 5sec.
normal condition for 30 minutes

Insulation
Resistance

 

DC 500V, 10000M min.

Voltage
Withstanding

no damage

AC 500V for 1 minute

Load
Life

within.[2%]

70c, 1.5hours ON, 0.5hour OFF for 1000+48/-0hours in total
cooling for 1 hour

Moisture
Load Life

within.[2%]

402c, hum. of 90-95%, 1.5h. and cut off for 0.5hr
Repeated for 500+24/-0 h. in total cooling for one hr at room temp.

Soldering
Ability

At least 95%
solder coverage

2355c for 101seconds
cooling for one hour at room temp.

Soldering
Heat

within.[2%]

at 2705c for 101 seconds
cooling for one hour at room temp.

* TCR (ppm/c) = [(R2-R1)/R1][1/(T2-T1)106
- R1: resistance value at reference temperature
- R2: resistance value at test temp.
- T2: test temp. (about 75c)

GENERAL SPECIFICATIONS

Model

Power Rating
at 100c
[Watts]

Resistance Range []

Operating Temperature Range [c]

Rated Voltage

SMW 2W

2

0.1 - 200

-55c - 200c

E = P*R
( E = rated voltage [V] )
( P : rated power[W] )
( R : total nominal resistance[] )

SMW 3W

3

0.1 - 300

SMW 5W

5

0.1 - 500

STRUCTURE

Material

Terminal is to be firmly connected with resistors element,
both electrically and mechanically, and allow easy soldering.

Coating

Flameproof UL94V0 molded package, resistant to heat, humidity & insulation.

Marking

Marking is made on the surface with Rated Wattage,
Nominal Resistance and Tolerance.

DIMENSIONS

Model

Dimensions (mm)

A0.3

B0.3

C0.3

D0.3

E max.

F0.3

SMW 2W

4

6.7

1.4

3.55

7.9

1.5

SMW 3W

5.5

10.5

1.7

5

12

2.3

SMW 5W

7.3

13.5

1.7

6.8

17

2.5

DERATING CURVE

ORDERING PROCEDURE EXAMPLE

Copyright©, RARA Electronics Corporation
Tel:82-32-817-4325 Fax:82-32-817-4329

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