Resistors
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
Surface mount ZI-form option
* Values 22R and above. UL file number E234469
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
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
°C/Watt
°C
Watts
Ohms
ppm/°C
Volts
%
2
4R7 – 68R
100
500
10, 20
E12
82
-55 to +155
Physical Data
Dimensions (mm) & Weight (g)
Type
EMC2
L max
10
D max
4
f min
27
d nom
0.8
PCB
mount
centres
18.4
Min bend
radius
1.2
Wt. nom
0.55
D
d
L
f
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: Solder-coated copper wire
Strength: The terminations meet the requirements of IEC 68.2.21
Solderability: 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
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
03.17
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
Flammability
The resistor coating is UL94-V0 rated and will not burn or emit incandescent particles under any condition of applied
temperature or power overload.
Marking
EMC resistors are colour coded with five bands. Four of the bands indicate value and tolerance in accordance with
IEC62. Parts with 20% tolerance have no fourth band. A fifth yellow band denotes constant voltage fusibility.
Performance Data
Maximum
Load at Rated Power: 1000hrs @ 70°C
Shelf life: 12 months at room temperature
Derating from rated power at 70°C
Climatic
Climatic Category
Temperature rapid change
Resistance to solder heat
ΔR%
ΔR%
ΔR%
ΔR%
ΔR%
5
2
Zero at 155°C
3
50/155/56
0.5
0.5
Pulse Performance
IEC61000-4-5 1.2/50 s
s Pulse
IEC61000-4-5 1.2/50
Pulse
IEC61000-4-5 1.2/50
700
700
700
600
600
600
500
500
500
400
400
400
300
300
300
200
200
200
100
100
100
0
0
0
10 20 30 40 50 60
0
0
0 10 20 30 40 50 60 70
70
10 20 30 40 50 60 70
Value (Ohms)
Value (Ohms)
Value (Ohms)
Pk Voltage (V)
Pk Voltage (V)
Pk Voltage (V)
10000
10000
10000
Single Rectangular Pulse
Single Rectangular Pulse
Single Rectangular Pulse
Pk Power (W)
Pk Power (W)
Pk Power (W)
1000
1000
1000
100
100
100
10
1010
1 1
1
0.01
0.1
0.01
0.01 0.1
0.1
Fusing Performance
Pulse Duration (ms)
Pulse Duration (ms)
Pulse Duration (ms)
1 1
1
10
10000
1010 100
100
1000
1000
10000
100
1000 10000
EMC resistors fuse open circuit at overload powers
exceeding 60W within the time indicated on the Fusing
Characteristic. Their fusing performance at lower overload
powers is not specified.
EMC resistors fuse safely in the event of a 115Vrms /
240Vrms overload (line / mains short circuit condition)
without burning or emitting incandescent particles.
After fusing, the resistance is at least 100 times greater
than the original nominal value.
Max. Fusing Time (s)
Fusing Characteristic
(Constant Voltage)
20
15
10
5
0
(4R7-8R2)
(10R-68R)
40
50
60
70
80
90
100
Initial Power (W)
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
03.17
Application Notes
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
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 at the center of the body can be calculated using the thermal impedance figures given under
Electrical Data.
3. For the purpose of UL approval, the following points should be observed:
(Delete redundant subtitle)
Application Notes
To protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided
3.1
between the body of the resistor and any combustible materials.
3.2 A positive clearance of 13mm should be provided between the resistor body or terminations and uninsulated parts of
1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm
opposite polarity or uninsulated dead metal parts.
from the body.
3.3 Limited Short Circuit testing should be performed in the complete appliance.
2. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An estimate of the temperature rise
4. ULW resistors can also be supplied with radial, goalpost or lancet pre-formed leads. In particular ULW2, ULW3, ULW4 and
to be expected can be calculated using the thermal impedance figures given under Electrical Data.
ULW5 are available in ZI-form SMD format packed in blister tape – see
so just copy it)
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.
http://www.ttelectronics.com/sites/default/files/resistors-datasheets/ZI-form.pdf
(This diagram exists on WP-S,
4. 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 ZI-form SMD format packed in blister tape - see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/
ZI-form.pdf
Also a 2W radial taped version is available as shown below
EMC2R Radial Taped Dimensions (mm)
Also a 2W radial taped version* is available as shown below.
Notation
Nominal
Tolerance
Dimension
Notation
Nominal
Tolerance
Dimension
ULWP2R
Component Body Length
Radial Taped Dimensions (mm)
Max
L
10.0
D
4.0 Max
L
10.0 Max
d
D
0.8 Nom
4.0 Max
P
d
12.7
±0.5
0.8 Nom
Po
P
12.7
±0.2
5
±0.5
Pitch of Holes
Po
10
±0.2
P1
3.85
±0.3
Distance between Hole & Component
P1
3.85
±0.3
Distance between Hole &
P2
5.85
±0.5
Component
P2
5.85
±0.5
Lead Pitch
F
5.0
+0.75 -0.34
Lead Pitch
5.0
+0.75 -0.34
Width of Backing Strip
W
F
18.0
±0.3
Width of Backing Strip
W
18.0
±0.3
Position of Hole
W1
9.0
±0.25
Position of Hole
W1
9.0
±0.25
Diameter of Hole
Do
4.0
±0.3
Diameter of Hole
Do
4.0
±0.3
Height to Lead Form
to Lead Form
Ho
16.0
±0.3
Height
Ho
16.0
±0.3
Height from Lead Form
from Lead Form
Ho1
21.7 Max
Height
Ho1
17.0 MAX
Height to Resistor
Ho2
18.0 Max
Height to Resistor
Ho2
18.0 MIN
Width of Adhesive Tape
Adhesive Tape
W2
15.0
±0.5
Width of
W2
15.0
±0.5
Length
<2.5
Length of protrusion
of protrusion
l
l
<2.5
K1
2.0
±0.3
K1
2.0
±0.3
K2
3.0
±0.5
K2
3.0
±0.5
Form Dimensions
Form Dimensions
K3
1.5
±0.25
K3
1.5
±0.25
K4
1.0
±0.2
K4
1.0
±0.2
*Although body dimensions differ slightly, ULWP2R Performance and Electrical Data are identical to those of ULW2
Component Body Diameter
Component Body Length
Terminal Lead Diameter
Body Diameter
Component
Component Pitch
Terminal Lead Diameter
Pitch of Holes
Component Pitch
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.
mm
EMC2
Figure 1
5
b
68
f
1
6
Body location
b
f
1
– f
2
f
2
6
1.4 mm
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
03.17
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
EMC REPLACEMENT
Example: EMC2-33RMI
(EMC2, 33 ohms ±20%, Pb-free)
Example: EMC2-33RMI
(EMC2, 33 ohms ±20%, Pb-free)
E
M
1
1
Type
EMC2
2
Leadforming
C
2
2
-
3
3
3
3
Value
R
M
4
4
Tolerance
I
5
5
Packing
Ordering Procedure
Blank = Axial
3/4 characters K = ±10%
I
EMC2 Ammo 2000/box
R = Radial taped
R = ohms
M = ±20% T15 EMC2R Reel 1500/reel
WP-S ADDITIONAL
Example: WPP2R-680RJT15
(WPP2R radially formed & taped, 680 ohms ±5%, Pb-free)
W
P
1
1
Type
2
Leadforming
P
2
R
2
3
Value
-
6
8
3
0
R
J
4
4
Tolerance
F = ±1%
G = ±2%
J = ±5%
T
1
5
5
Packing
T15 Tape & reel, 1500/reel
5
WPP2 R = Radial taped 3/4 characters
R = ohms
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
http://www.ttelectronics.com/resistors
© TT Electronics plc
03.17
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