Temperature Derating Curve

125

Ambient Temperature /

°C

75

50

25

0

100

-15

70

155

Pulse Withstanding

Chip Resistors

PWC Series

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Thermal Performance Data

Issue G · 03.06

Packaging

0805 and 1206 PWC series resistors are

supplied on 8mm carrier tape and 7 inch

reels as per IEC 286-3, quantity per

reel; 3000.

2010 and 2512 PWC series resistors are

supplied on 12mm carrier tape and 7

inch reels as per IEC 286-3, quantity per

reel; 2010 : 3000pcs; 2512 : 1800pcs.

Reels of 1000pcs are available on

request.

PWC resistors are ideally suited for handling by automatic

methods due to their rectangular shape and the small

dimensional tolerances. Electrical connection to a ceramic

substrate or to a printed circuit board can be made by reflow

or wave soldering of wrap-around terminations.

Wrap-around terminations provide good leach properties and

ensure reliable contact. Due to the robust construction, the

PWC can be immersed in the solder bath for 30 seconds at

260°C. This enables the resistor to be mounted on one side

of a printed circuit board and wire-leaded components

applied on the other side.

PWC resistors themselves can operate at a maximum

temperature of 155°C. For soldered resistors, the joint

temperature should not exceed 110°C. This condition is met

when the stated power levels at 70°C and recommended pad

and trace areas are used. Allowance should be made if

smaller areas of copper are used.

A full Application Note on the PWC Series is available.

Ordering Procedure

Specify type reference etc as shown in this example of

PWC2512 10K ohms 1%.

Temperature Rise Curves

80

Power Dissipation /W

60

40

20

0

0

0.5

1

1.5

0805

1206

2010

2512

Application Notes

2.5 ± 0.5

13 ± 0.5

33 ± 1.0

Marking

0.8 ± 0.15

9.0

8mm tape: 9mm ± 0.5

12mm tape: 13mm ± 0.5

+ 0.1

- 0.15

T

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

0805

8

4

4

2

1.5

1

1.75

3.5

1.65

2.45

0.8

0.2

0.05

1.1

1206

8

4

4

2

1.5

1

1.75

3.5

1.95

3.55

1.0

0.2

0.05

1.3

2010

12

4

4

2

1.5

1.5

1.75

5.5

2.79

5.89

0.91

0.28

0.06

1.21

2512

12

8

4

2

1.5

1.5

1.75

5.5

3.61

6.96

1.17

0.28

0.06

1.45

Type

PWC

2512

-

10K

F

Size

Value (use IEC62 code)

Tolerance (use IEC62 code)

D0.5%

F1%

J5%

Welwyn Components

Welwyn Components