Application Notes

1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered

closer than 4mm from the body.

2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An estimate of

the temperature rise to be expected can be calculated using the thermal impedance figures given under Electrical

Data.

3. To protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided

between the body of the resistor and any combustible materials.

3. EMC resistors can also be supplied loose packed with radial, goalpost or lancet pre-formed leads, tape packed with

radial pre-formed leads, or in blister tape with Z-formed leads for SMD mounting. Consult factory for details.

Packaging

Our standard packaging for EMC is taped and boxed. The critical dimensions are shown in Figure 1. The component

wires will not protrude beyond the outside edge of the tapes. Alternative packaging is available by request.

Dimensions

mm

EMC2

B

68

C

5

Standard Quantities per Package

Type

EMC2

Ammo pack

2000

Ordering Procedure

Specify type reference, value and tolerance as shown in this example of EMC2 at 33

Ω, 20%:

EMC2 -

33R

M

Type

Value (use IEC62 code)

Tolerance (use IEC 62 code)

K

10%

M

20%

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

Issue I 03/07/03 SJO

A subsidiary of TT electronics plc

b

f1

f2

Figure 1

Body location f1-f2 < 1.4mm

6

6

c