Flameproof Power
Metal Film Resistors
MFP Series
Smallestsizeforpowerrang
Resistancerange0.1ohmsto1Mohms
Flameproofprotecon
SurfacemountZI-formopon
Flameproof Power
Metal Film Resistors
MFP Series
•Smallest size for power rating
•Resistance range 0.1 ohms to 1M ohms
•Flameproof protection
MFP1 MFP2
Power rating at 70°C watts <1 Ω: 0.7 >=1 Ω: 1.0 2
Resistance range ohms 0R1 – 1M 1R0 – 1M
Limiting element voltage volts 350
TCR ppm/°C < 1 Ω: 300 1 Ω- 9.1 Ω: 200 ≥10 Ω: 100
Resistance tolerance % 1, 2, 5
Standard values E24 preferred
Thermal impedance °C/watt 120 82
Ambient temperature range °C -55 to 155
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 data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Electrical Data
Issue D · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
143
Marking
Resistors are colour coded with 4 or 5 bands depending on
value and tolerance. IEC 62 colours are used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent
particles under any condition of applied temperature or
power overload.
Construction
The resistance element is a precisely controlled thin film of
metal alloy on a high purity ceramic core, protected by a
cement coating applied so that terminations remain
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
Dimensions (mm) & Weight (g)
PCB Min.
mounting
bend
Type L Max D Max f min d nom centres radius Wt.nom
MFP1 6.2 2.5 21.0 0.6 10.2 0.6 0.3
MFP2 10.0 4.0 27.0 0.8 18.4 1.2 0.55
Physical Data
L
D
f
d
100
Flameproof Power
Metal Film Resistors
MFP Series
•Smallest size for power rating
•Resistance range 0.1 ohms to 1M ohms
•Flameproof protection
MFP1 MFP2
Power rating at 70°C watts <1 Ω: 0.7 >=1 Ω: 1.0 2
Resistance range ohms 0R1 – 1M 1R0 – 1M
Limiting element voltage volts 350
TCR ppm/°C < 1 Ω: 300 1 Ω- 9.1 Ω: 200 ≥10 Ω: 100
Resistance tolerance % 1, 2, 5
Standard values E24 preferred
Thermal impedance °C/watt 120 82
Ambient temperature range °C -55 to 155
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 data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Electrical Data
Issue D · 03.06
A subsidiary of
TT electronics plc
Welwyn Components
143
Marking
Resistors are colour coded with 4 or 5 bands depending on
value and tolerance. IEC 62 colours are used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn or emit incandescent
particles under any condition of applied temperature or
power overload.
Construction
The resistance element is a precisely controlled thin film of
metal alloy on a high purity ceramic core, protected by a
cement coating applied so that terminations remain
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
Dimensions (mm) & Weight (g)
PCB Min.
mounting
bend
Type L Max D Max f min d nom centres radius Wt.nom
MFP1 6.2 2.5 21.0 0.6 10.2 0.6 0.3
MFP2 10.0 4.0 27.0 0.8 18.4 1.2 0.55
Physical Data
L
D
f
d
100
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)
Flameproof Power Metal Film Resistors
MFP Series
Flameproof Power
Metal Film Resistors
MFP Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue D · 03.06
Welwyn Components
144
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 limitations 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. These products are also available in a range of lead forming
options. In particular, MFP2 is available in ZI-form SMD
format packed in blister tape - see:
http://www.ttelectronicsresistors.com/pdf/datasheet/ZI-form.pdf
b
f1f2
66
5
Body location f 1 – f 2≤ 1.4 mm
Figure 1
Packaging
MFP resistors are normally supplied tape packed ready for
loading onto automatic sequencing and insertion machines.
The standard taping method and critical dimensions are
shown in Figure 1.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Maximum
Load at rated power : 1000 hours at 70°C ∆5% R
Shelf life : 12 months at room temperature ∆2% R
Derating from rated power at 70°C ∆C°551 ta orez% R
Climatic ∆3% R
Climatic category 50/155/56
Temperature rapid change ∆5.0% R
Resistance to solder heat ∆5.0% R
nim 005stlovfoorp egatloV
Performance Data
2PFM1PFMepyT
b8625)mm(
Ordering Procedure
Example: MFP2 at 4.7 kilohms and 1% tolerance in ammo pack box of 2000 pieces –
M F P 2 – 4 K 7 F I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
G
2%
J
5%
Packing
I Ammo
MFP1
5000/box
Standard
MFP2
2000/box
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
MFP2 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
Flameproof Power
Metal Film Resistors
MFP Series
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue D · 03.06
Welwyn Components
144
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 limitations 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. These products are also available in a range of lead forming
options. In particular, MFP2 is available in ZI-form SMD
format packed in blister tape - see:
http://www.ttelectronicsresistors.com/pdf/datasheet/ZI-form.pdf
b
f1f2
66
5
Body location f 1 – f 2≤ 1.4 mm
Figure 1
Packaging
MFP resistors are normally supplied tape packed ready for
loading onto automatic sequencing and insertion machines.
The standard taping method and critical dimensions are
shown in Figure 1.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Maximum
Load at rated power : 1000 hours at 70°C ∆5% R
Shelf life : 12 months at room temperature ∆2% R
Derating from rated power at 70°C ∆C°551 ta orez% R
Climatic ∆3% R
Climatic category 50/155/56
Temperature rapid change ∆5.0% R
Resistance to solder heat ∆5.0% R
nim 005stlovfoorp egatloV
Performance Data
2PFM1PFMepyT
b8625)mm(
Ordering Procedure
Example: MFP2 at 4.7 kilohms and 1% tolerance in ammo pack box of 2000 pieces –
M F P 2 – 4 K 7 F I
Type
Value (use IEC62 code)
Tolerance (use IEC62 code)
F
1%
G
2%
J
5%
Packing
I Ammo
MFP1
5000/box
Standard
MFP2
2000/box
Flameproof Power Metal Film Resistors
MFP Series
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
Alsoa2Wradialtapedversionisavailableasshownbelow
MFP2R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 P12.7 ±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 F5.0 +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
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
(Delete redundant subtitle)
(This diagram exists on WP-S,
so just copy it)
Ordering Procedure
Example: MFP2-4K7FI (MFP2, 4.7 kilohms ±1%, Pb-free)
ULW ADDITIONAL
Example: ULWP2R-33RJT15 (ULWP2R radially formed & taped, 33 ohms ±5%, Pb-free)
WHS ADDITIONAL
Example: WHSP2R-100RJT15 (WHSP2R radially formed & taped, 100 ohms ±5%, Pb-free)
MFP REPLACEMENT
Example: MFP2-4K7FI (MFP2, 4.7 kilohms ±1%, Pb-free)
U
L
W
P
2
R
-
3
3
R
J
T
1
5
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
ULWP2
R = Radial taped
3/4 characters
J = ±5%
T15
Tape & reel, 1500/reel
R = ohms
W
H
S
P
2
R
-
1
0
0
R
J
T
1
5
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
3/4 characters
M
F
P
2
-
4
K
7
F
I
1
2
3
4
5
1
2
3
4
5
Type Leadforming Value Tolerance Packing
MFP1
Blank = Axial
3/4 characters
F = ±1%
I
MFP1
Ammo
5000/box
MFP2
R = Radial taped
(MFP2 only)
R = ohms
G = ±2%
MFP2
2000/box
K = kilohms
J = ±5%
T15
MFP2R
Reel
1500/reel
M = megohms
R = ohms
WHSP2
WHS3
R = Radial taped
J = ±5%
G = ±2%
F = ±1% T15 WHSP2R Tape & reel
Tape & reel
Ammo pack
1500/reel
1000/reel
2000/box
WHS3R
A2
T1