Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
UL1412 recognised*
Failsafe 240V mains fusing
Good pulse handling capability
Smallsizeforpowerrang
UL94-V0ameproofprotecon
SurfacemountZI-formopon
*Values22Randabove.ULlenumberE234469
Dimensions (mm) & Weight (g)
Type L max D max f min d nom
PCB
mount
centres
Min bend
radius Wt. nom
EMC2 10 4 27 0.8 18.4 1.2 0.55
Physical Data
Lf
D
d
EMC2
Powerrangat70°C Was 2
Resistance range Ohms 4R7–68R
TCR(25to75°C) ppm/°C 100
IsolaonVoltage Volts 500
Resistance Tolerance % 10, 20
Standard Values E12
Thermal Impedance °C/Wa 82
Ambient temperature range °C -55 to +155
ElectricalData
Construcon
Themetallmisdepositedontoahighpurityceramicrod.Endcapsareforceedandterminaonwiresarewelded
totheendcaps.Finally,acementproteconisappliedtotheresistorbodypriortomarkingwithindelibleink.Thecementprotecon
isappliedinamannerthatleavestheterminaonscompletelyclear.Thispermitsawell-denedbodylength(cleanleadtocleanlead
dimension L).
Terminaons
Material: Solder-coated copper wire
Strength:TheterminaonsmeettherequirementsofIEC68.2.21
Solderability:TheterminaonsmeettherequirementsofIEC115-1Clause4.17.3.2
Solvent Resistance
Thebodyproteconandmarkingareresistanttoallnormalindustrialcleaningsolventssuitableforprintedcircuits.
Resistors
12.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)AllpartsarePb-freeandcomplywithEUDirecve2011/65/EUamendedby(EU)2015/863(RoHS3)
Single Rectangular Pulse
1
10
100
1000
10000
0.01 0.11 10 100 1000 10000
Pulse Duration (ms)
Pk Power(W)
Single Rectangular Pulse
1
10
100
1000
10000
0.01 0.11 10 100 1000 10000
Pulse Duration (ms)
Pk Power(W)
Single Rectangular Pulse
1
10
100
1000
10000
0.01 0.11 10 100 1000 10000
Pulse Duration (ms)
Pk Power(W)
IEC61000-4-5 1.2/50 s Pulse
0
100
200
300
400
500
600
700
010203040506070
Value(Ohms)
Pk Voltage(V)
IEC61000-4-5 1.2/50 s Pulse
0
100
200
300
400
500
600
700
010203040506070
Value(Ohms)
Pk Voltage(V)
IEC61000-4-5 1.2/50 s Pulse
0
100
200
300
400
500
600
700
010203040506070
Value(Ohms)
Pk Voltage(V)
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
Flammability
TheresistorcoangisUL94-V0ratedandwillnotburnoremitincandescentparclesunderanycondionofapplied
temperature or power overload.
Marking
EMCresistorsarecolourcodedwithvebands.Fourofthebandsindicatevalueandtoleranceinaccordancewith
IEC62.Partswith20%tolerancehavenofourthband.Ahyellowbanddenotesconstantvoltagefusibility.
Maximum
LoadatRatedPower:1000hrs@70°C ΔR% 5
Shelf life: 12 months at room temperature ΔR% 2
Derangfromratedpowerat70°C Zeroat155°C
Climac ΔR% 3
ClimacCategory 50/155/56
Temperature rapid change ΔR% 0.5
Resistance to solder heat ΔR% 0.5
Performance Data
Pulse Performance
Fusing Performance
EMCresistorsfuseopencircuitatoverloadpowers
exceeding60WwithinthemeindicatedontheFusing
Characterisc.Theirfusingperformanceatloweroverload
powersisnotspecied.
EMCresistorsfusesafelyintheeventofa115Vrms/
240Vrmsoverload(line/mainsshortcircuitcondion)
withoutburningoremingincandescentparcles.
Aerfusing,theresistanceisatleast100mesgreater
than the original nominal value.
Fusing Characteristic
(Constant Voltage)
Initial Power (W)
Max. Fusing Time (s)
40 50 60 70 80 90 100
0
5
10
15
20
(4R7-8R2)
(10R-68R)
12.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
Applicaon Notes
1.Iftheresistorsaretodissipatefullratedpower,itisrecommendedthattheterminaonsshouldnotbesolderedcloserthan4mmfrom
the body.
2.DuetooperangtemperaturelimitsimposedbysomePCBmaterials,derangmaybenecessary.Anesmateofthetemperaturerise
tobeexpectedcanbecalculatedusingthethermalimpedanceguresgivenunderElectricalData.
3.Toprotectagainstreunderallcondionsofoverload,aposiveclearanceofatleast13mmshouldbeprovidedbetweenthebodyof
theresistorandanycombusblematerials.
4.EMCresistorscanalsobesuppliedloosepackedwithradial,goalpostorlancetpre-formedleads-see
hps://www.electronics.com/TTElectronics/media/ProductFiles/Resistors/ApplicaonNotes/TN008-Resistors-Leadform-Capability.pdf,
orinZI-formSMDformatpackedinblistertape-see
hps://www.electronics.com/TTElectronics/media/ProductFiles/Resistors/Datasheets/ZI-form.pdf
Packaging
OurstandardpackagingforEMCistapedandboxed.ThecricaldimensionsareshowninFigure1.Thecomponentwireswillnotprotrude
beyondtheoutsideedgeofthetapes.Alternavepackagingisavailablebyrequest.
mm EMC2
b68
b
f1f2
66
5
Body location f1 – f2 1.4 mm
Figure 1
12.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
EMC2RRadialTapedDimensions(mm)
Dimension Notaon Nominal Tolerance
Component Body Length L 10.0 Max
Component Body Diameter D 4.0 Max
Terminal Lead Diameter d 0.8Nom
Component Pitch P 12.7 ±0.5
PitchofHoles Po 12.7 ±0.2
DistancebetweenHole&Component P1 3.85 ±0.3
P2 5.85 ±0.5
Lead Pitch F 5.0 +0.75-0.34
WidthofBackingStrip W 18.0 ±0.3
PosionofHole W1 9.0 ±0.25
DiameterofHole Do 4.0 ±0.3
HeighttoLeadForm Ho 16.0 ±0.3
HeightfromLeadForm Ho1 21.7 Max
HeighttoResistor Ho2 18.0 Max
Width of Adhesive Tape W2 15.0 ±0.5
Length of protrusion l <2.5
Form Dimensions
K1 2.0 ±0.3
K2 3.0 ±0.5
K3 1.5 ±0.25
K4 1.0 ±0.2
Also a 2W radial taped version is available as shown below
Application Notes
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:
3.1 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.
3.2 A positive clearance of 13mm should be provided between the resistor body or terminations and uninsulated parts of
opposite polarity or uninsulated dead metal parts.
3.3 Limited Short Circuit testing should be performed in the complete appliance.
4. ULW resistors can also be supplied with radial, goalpost or lancet pre-formed leads. In particular ULW2, ULW3, ULW4 and
ULW5 are available in ZI-form SMD format packed in blister tape – see
http://www.ttelectronics.com/sites/default/files/resistors-datasheets/ZI-form.pdf
Also a 2W radial taped version* is available as shown below.
*Although body dimensions differ slightly, ULWP2R Performance and Electrical Data are identical to those of ULW2
ULWP2R Radial Taped Dimensions (mm)
Dimension
Notation
Nominal
Tolerance
Component Body Length
L
10.0 Max
Component Body Diameter
D
4.0 Max
Terminal Lead Diameter
d
0.8 Nom
Component Pitch
P
5
±0.5
Pitch of Holes
Po
10
±0.2
Distance between Hole &
Component
P1
3.85
±0.3
P2
5.85
±0.5
Lead Pitch
F
5.0
+0.75 -0.34
Width of Backing Strip
W
18.0
±0.3
Position of Hole
W1
9.0
±0.25
Diameter of Hole
Do
4.0
±0.3
Height to Lead Form
Ho
16.0
±0.3
Height from Lead Form
Ho1
17.0 MAX
Height to Resistor
Ho2
18.0 MIN
Width of Adhesive Tape
W2
15.0
±0.5
Length of protrusion
l
<2.5
Form Dimensions
K1
2.0
±0.3
K2
3.0
±0.5
K3
1.5
±0.25
K4
1.0
±0.2
(This diagram exists on WP-S,
so just copy it)
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
Ordering Procedure
Example: EMC2-33RMI (EMC2,33ohms±20%,Pb-free)
12.19
General Note
TT Electronics reserves the right to make changes in product specication without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
© TT Electronics plc
www.ttelectronics.com/resistors
BI Technologies IRC Welwyn
EMC REPLACEMENT
Example: EMC2-33RMI (EMC2, 33 ohms ±20%, Pb-free)
WP-S ADDITIONAL
Example: WPP2R-680RJT15 (WPP2R radially formed & taped, 680 ohms ±5%, Pb-free)
E
M
C
2
-
3
3
R
M
I
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
EMC2
Blank = Axial
3/4 characters
K = ±10%
I
EMC2
Ammo
2000/box
R = Radial taped
R = ohms
M = ±20%
T15
EMC2R
Reel
1500/reel
W
P
P
2
R
-
6
8
0
R
J
T
1
5
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
WPP2
R = Radial taped
F = ±1%
T15
G = ±2%
J = ±5%
3/4 characters
R = ohms
K = kilohms A2
T1
WPP2R Tape & reel
Tape & reel
Ammo pack
1500/reel
1000/reel
2000/box
WP3SR
WP3S
Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series