4. Applications & Ratings

SS-258 R6

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

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KOA SPEER ELECTRONICS, INC.

5. Environmental Applications

Derating Curve

100

80

60

40

20

-60

-40

-20

0

40

60

80

100

140

70

20

Ambient Temperature

(∞C)

0

-55

120

125

Surface Temperature Rise - UR73 & UR73D

100

75

25

50

100

% Rated Power

2B (.25W) (2)

2B (.5W) (2)

0

0

25

75

2B (.5W) (1)

2A (2)

2B (.25W) (1)

50

2A (1)

100

75

25

50

100

% Rated Power

1J (2)

2B (2)

0

0

25

75

2B (1)

1J (1)

2A (2)

2A (1)

50

3A (2)

3A (1)

1E (1)

1E (2)

2H (1)

2H (2)

UR73 33m

UR73D 10m

2

1

2

1

Absolute

Maximum

Working

Voltage

F (±1%) E-24,

25m , 50m

Resistance Range

Part

Designation

Maximum

Overload

Voltage

(5 sec. max.)

Operating

Temperature

Range

Power

Rating

T.C.R.

(ppm/°C)

Max.

UR732A

UR732B

1/4W (.25W)

±100

47m - 100mΩ

0.395V

0.158V

-55°C

to

+125°C

±250

±100

±250

1/4W (.25W)

1/2W (.5W)*

33m - 43mΩ

47m - 100mΩ

30m - 43mΩ

UR73D1J

UR73D2A

1/5W (.2W)

±100

47m - 100mΩ

0.353V

0.141V

±200

±250

±200

1/4W (.25W)

30m - 43mΩ

10m - 30mΩ

10m - 27mΩ

UR73D2B

1/2W (.5W)

±300

10m - 27mΩ

0.216V

0.086V

0.290V

0.116V

UR73D2H

±250

±100

3/4W (.75W)

10m - 30mΩ

33m - 100mΩ

0.685V

0.274V

UR73D3A

±250

±100

1W (1W)

10m - 30mΩ

33m - 100mΩ

0.791V

0.316V

* Please contact factory for Power Rating

UR73D1E

1/8W (.125W)

±100

47m - 100mΩ

±500

25mΩ

0.279V

0.111V

0.395V

0.158V