Metal Strip Current Sense

Resistors Surface Mount

ULR Series

Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com

Issue A · 09.06

Recommended Solder Pad Layout

Type

ULR2

- R0025

F

T2

Resistance value (IEC62 code)

Tolerance (IEC62 code)

Packing

F1%

J5%

T2

Tape

2512

2000 / reel

Ordering Procedure

Example: ULR2 at 2.5 milliohms and 1% tolerance on reel of 2000 pieces:

Welwyn Components

Welwyn Components

4-wire pad layout (recommended for precision current sensing)

2-wire pad layout

3.6

1.8

4.75

1.45

0.7

1.8

4.75

Type

Values (m

Ω)

L

W

T

D

Nom. Wt. (g)

Green

0.5m

Ω, 0.75mΩ

6.35

3.18

1.00

1.93

0.09

Green

1m

Ω to 10mΩ

6.35

3.18

0.60

1.93

0.08

Black

0.5m

Ω

6.35

3.18

1.40

1.30

0.06

Black

0.75m

Ω

6.35

3.18

1.00

1.30

0.06

Black

1m

Ω

6.35

3.18

0.80

1.30

0.06

Black

1.5m

Ω

6.35

3.18

0.65

1.30

0.06

Black

2m

Ω

6.35

3.18

0.50

1.30

0.06

Black

2.5m

Ω

6.35

3.18

1.00

1.30

0.06

Black

3m

Ω

6.35

3.18

0.70

1.30

0.06

Black

3.5m

Ω

6.35

3.18

0.71

1.30

0.06

Black

4m

Ω

6.35

3.18

0.60

1.30

0.06

Black

4.5m

Ω

6.35

3.18

0.58

1.30

0.06

Black

5m

Ω

6.35

3.18

0.50

1.30

0.06

Black

5.5m

Ω

6.35

3.18

0.47

1.30

0.06

Black

6m

Ω

6.35

3.18

0.50

1.30

0.06

Black

7m

Ω

6.35

3.18

0.45

1.30

0.06

Dimensions (mm)

Flammability

The resistor will not burn or emit incandescent particles under any condition of applied temperature or overload.

Solvent resistance

The body protection and marking are resistant to all normal industrial solvents suitable for printed circuits.

Packaging

The standard packing for ULR parts is on a 2000 piece reel of size 12mm tape

T

L

W

D