RARA ELECTRONICS COMPANY-IRV/IRH Specifications

PWR PRECISION POWER
FIXED WIRE-WOUND RESISTORS

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These components offer complete welded construction under a high temperature resistant silicone coating.
A wide resistance range is offered from 0.1ohms to 100Kohms. Available on tape in wattages of 1W
to 3W and also in non-inductine"n" configurations. Tolerances as low as +-0.05% and special TCR and
tolerance matching available.

SPECIFICATIONS

Model

Power
Rating
[W]

Max. Working
Voltage [V]

Resistance Range [ohms]

Tolerance

W Note1

N Note 2

PWR 0.5

0.5

20

0.1 - 3K

0.1 - 1.5K

A(+-0.05%)
B(+-0.1%)
C(+-0.25%)
D(+-0.5%)
F(+-1%)
G(+-2%)

PWR 1

1

50

0.1 - 8K

0.1 - 3K

PWR 2

2

100

0.1 - 10K

0.1 - 4K

PWR 3

3

200

0.1 - 18K

0.1 - 9K

PWR 5

5

400

0.1 - 35K

0.1 - 17K

PWR 7

7

450

0.1 - 50K

0.1 - 25K

PWR 10S

10

700

0.1 - 70K

0.1 - 35K

PWR 10L

10

800

0.1 - 100K

0.1 - 50K

Note 1: Inductive, Note 2: Non-inductive

DIMENSIONS

Model

Dimensions [mm]

D+-0.8

L+-1.5

d+-0.02

l+-1

PWR 0.5

3.30

10.0

0.7

37

PWR 1

4.00

12.0

0.8

37

PWR 2

4.70

13.8

0.8

35

PWR 3

5.90

15.7

0.8

35

PWR 5

8.52

22.5

0.8

44

PWR 7

8.52

24.5

0.8

44

PWR 10S

8.52

39.2

0.8

35

PWR 10L

10.5

46.2

0.8

33

CHARACTERISTICS

Test

Conditions

Load Life

+-(0.5%+0.05ohm)                                    Power Rating 90min-ON, 30min-OFF, 2000 hr.

Temperature Coefficient

                              -0.99ohm:+-90ppm/C; 1-9.9ohm: +-50ppm/C; 10ohm+: +-20ppm/C

Thermal Shock

+-(0.2%+0.05ohm)                                         -65C(30min.),25C,150(30min.),25C, 5cycle

Short Time Overload

+-(0.2%+0.05ohm)                                                                                                    See Note 1

Dielectric Strength

+-(0.1%+0.05ohm)                                                                                          500VAC, 1 min.

Low Temp. Storage

+-(0.2%+0.05ohm)                                                                                             -65C for 24 hr.

High Temp. Exposure

+-(0.5%+0.05ohm)                                                                                               275C for 2 hr.

Terminal Strength

+-(0.1%+0.05ohm)                                                                                          4.5kg for 10sec.

Insulation Resistance

1Gohm min. dry.                                                                                                   DC500V, 1min.

Solderability

95% coverage                                                                                               min230C for 5 sec.

   Note 1: 1W-3W: 5 Times rated power for 5 sec. 5W-10W: 10 Times rated power for 5 sec.

DERATING CURVE

ORDERING PROCEDURE EXAMPLE

Model	Power Rating [W]	Max. Working Voltage [V]	Resistance Range [ohms]		Tolerance
Model	Power Rating [W]	Max. Working Voltage [V]	W Note1	N Note 2	Tolerance
PWR 0.5	0.5	20	0.1 - 3K	0.1 - 1.5K	A(+-0.05%) B(+-0.1%) C(+-0.25%) D(+-0.5%) F(+-1%) G(+-2%)
PWR 1	1	50	0.1 - 8K	0.1 - 3K
PWR 2	2	100	0.1 - 10K	0.1 - 4K
PWR 3	3	200	0.1 - 18K	0.1 - 9K
PWR 5	5	400	0.1 - 35K	0.1 - 17K
PWR 7	7	450	0.1 - 50K	0.1 - 25K
PWR 10S	10	700	0.1 - 70K	0.1 - 35K
PWR 10L	10	800	0.1 - 100K	0.1 - 50K

Model	Dimensions [mm]
	D+-0.8	L+-1.5	d+-0.02	l+-1
PWR 0.5	3.30	10.0	0.7	37
PWR 1	4.00	12.0	0.8	37
PWR 2	4.70	13.8	0.8	35
PWR 3	5.90	15.7	0.8	35
PWR 5	8.52	22.5	0.8	44
PWR 7	8.52	24.5	0.8	44
PWR 10S	8.52	39.2	0.8	35
PWR 10L	10.5	46.2	0.8	33

Test	Conditions
Load Life	+-(0.5%+0.05ohm) Power Rating 90min-ON, 30min-OFF, 2000 hr.
Temperature Coefficient	-0.99ohm:+-90ppm/C; 1-9.9ohm: +-50ppm/C; 10ohm+: +-20ppm/C
Thermal Shock	+-(0.2%+0.05ohm) -65C(30min.),25C,150(30min.),25C, 5cycle
Short Time Overload	+-(0.2%+0.05ohm) See Note 1
Dielectric Strength	+-(0.1%+0.05ohm) 500VAC, 1 min.
Low Temp. Storage	+-(0.2%+0.05ohm) -65C for 24 hr.
High Temp. Exposure	+-(0.5%+0.05ohm) 275C for 2 hr.
Terminal Strength	+-(0.1%+0.05ohm) 4.5kg for 10sec.
Insulation Resistance	1Gohm min. dry. DC500V, 1min.
Solderability	95% coverage min230C for 5 sec.