Low Value 3W

Chip Resistors

LRF3W Series

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

Issue D · 07.06

Welwyn Components

85

Typical

∆R%

1

∆R%

0.5

∆R%

0.5

∆R%

0.5

∆R%

0.5

∆R%

0.5

∆R%

0.25

∆R%

0.25

∆R%

0.25

∆R%

0.1

90 Seconds min.

Performance Data

Construction

Patented non-noble copper based thick film material,

overglaze and organic protection are screen printed on a 96%

alumina substrate. The components are laser trimmed to

achieve the required resistance tolerance.

Terminations

The wrap-around terminations have an electroplated nickel

barrier and matte tin finish, this ensures excellent ‘leach’

resistance properties and solderability.

Chips can withstand immersion in solder at 250°C for

90 seconds and are suitable for reflow or wave soldering

mounting applications.

Marking

The body protection and marking are resistant to all normal

industrial cleaning solvents suitable for printed circuits.

Chips are packed and mounted with marking side up.

The LRF3W Chips are mounted with the actual resistor

element mounted face down on its termination pads.

Packaging

LRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.

Tape dimensions in mm

W

P1

P0

P2

D0

D1

E

F

A0

B0

K0

T

T1

T2

±0.3

±0.1

±0.1

±0.05

±0.1

±0.2

±0.1

±0.05

±0.1

±0.1

±0.1

±0.05

nom

±0.15

LRF3W

12

8

4

2

1.5

1.5

1.75

5.5

3.61

6.96

1.17

0.28

0.06

1.45

2.5

± 0.5

13

± 0.5

33

± 1.0

Marking

(Both sides)

0.8

± 0.15

13

± 0.5mm

T