Recommended Solder Pad Layout

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

2-wire pad layout

Dimensions (mm)

Type

Values (m

Ω)

L

W

T

D

Nom. Wt. (g)

Green

0.5 m

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

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

Ordering Procedure

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

U L R 2 – R 0 0 2 5 F T 2

Type

Value (use IEC62 code)

Tolerance (use IEC62 code)

F

1%

J

5%

Packing

T2

Tape

2512

2000 / reel

General Note

Welwyn Components reserves the right to make changes in product specification without notice or liability.

All information is subject to Welwyn’s own test data and is considered accurate at time of print.

©Welwyn Components Limited

Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com

A subsidiary of TT electronics plc

4.75

1.8

0.7

1.45

1.8

4.75

3.6

W

D

T

L