Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
•
•
•
•
•
UL1412 recognised*
Failsafe 240V mains fusing
Good pulse handling capability
Small size for power rating
UL94-V0 flameproof protection
* Values 22R and above. UL file number E234469
Electrical Data
EMC2
Power rating at 70°C
Resistance range
TCR (25 to 75°C)
Isolation Voltage
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
Watts
Ohms
ppm/°C
Volts
%
°C/Watt
°C
2
4R7 – 68R
100
500
10, 20
E12
82
-55 to +155
D
d
L
f
Physical Data
Dimensions (mm) & Weight (g)
Type
L
max
D
max
f
min
27
d
nom
0.8
PCB mount centres
18.4
Min bend radius
1.2
Wt.
nom
0.55
EMC2
10
4
Construction
The metal film is deposited onto a high purity ceramic rod. End caps are force fitted and termination wires are welded
to the end caps. Finally, a cement protection is applied to the resistor body prior to marking with indelible ink. The
cement protection is applied in a manner that leaves the terminations completely clear. This permits a well-defined
body length (clean lead to clean lead dimension L).
Terminations
Material:
Strength:
Solderability:
Solder-coated copper wire
The terminations meet the requirements of IEC 68.2.21
The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits.
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
A subsidiary of TT electronics plc
Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com
WELWYN [ WELWYN COMPONENTS LIMITED ]
