Resistors
Metal Film Resistors
Metal Film Resistors
MFR Series
MFR Series
Professional grade approved to BSCECC
Professional grade approved to
40101-803 and 019
Tolerances down to 0.5%
BSCECC 40101-803 and 019
Temperature coefficient down to 50ppm/°C
Tolerances down to 0.5%
Optional RoHS compliant or Lead bearing wire finishes
Temperature coefficient down to 50ppm/°C
Welwyn Components
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Power rating at 70°C
Resistance range
Limiting element voltage
TCR
Resistance tolerance
watts
ohms
volts
ppm/°C
%
MFR3
0.4
10R - 1M
200
50
1
MFR4
0.5
1R0 - 1M
350
50
0.5, 1
FZ
FX
0.25
0.25
1 to 1M
1 to 1M
250
250
100
250
5.1 to 9.1 : 200 5.1 to 9.1 : 500
1
1
BC
0.125
10 to 1M
200
50
0.5, 1
BK
0.125
10 to 1M
200
100
0.5, 1
MFR5
0.75
1R0 - 1M
350
≤10:150
>10:100
0.5, 1
EZ
0.5
10 to 1M0
350
100
1
CC
0.25
10 to 1M
250
50
0.5, 1
EX
0.5
10 to 1M
350
250
1
CK
0.25
10 to 1M
250
100
0.5, 1
CECC 40101 - 019 Requirements
Power rating at 70°C
watts
Resistance range.
ohms
Limiting element voltage
volts
TCR
ppm/°C
Resistance tolerance
%
CECC 40101 - 803 Requirements
Power rating at 70°C
watts
Resistance range.
ohms
Limiting element voltage
volts
TCR
ppm/°C
Resistance tolerance
%
These tables indicate the CECC specification requirements, and these are met or exceeded by the corresponding MFR series products.
.
Standard values
Thermal impedance
Ambient temperature range
Product grades available
E24, E96 preferred
°C/watt
°C
150
commercial
140
-55 to 155
commercial, professional
112
professional
Physical Data
Dimensions (mm) & Weight (g)
Type
MFR3
MFR4
MFR5
Commercial
Professional
Commercial
Professional
L max
3.7
6.2
6.8
9.0
D max
2.0
2.5
3.0
3.6
F min
22.4
21.0
21.0
19.6
d nom
0.45
0.6
0.55
0.8
PCB
mount
centres
Min
bend
radius
Wt.
nom
7.6
10.2
10.2
12.7
0.5
0.6
0.6
1.2
0.1
0.3
0.3
0.5
d
D
L
f
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
Welwyn Components reserves the right to make changes in product specification
or liability.
All information
subject to TT Electronics’ own data and is considered
accurate at time of going
print.
All information is
is subject to Welwyn’s own data and is considered
accurate at time of going to
to print.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
11. 09
01.18
135
Metal Film Resistors
Metal Film Resistors
MFR
Series
MFR
Series
Welwyn Components
Performance Data - Type MFR 3
CECC 40101-019
*
Requirements
Load at commercial rating : 1000 hours at 70°C
Load at CECC rating :
1000 hours at 70°C
Shelf life :
12 months at room temperature
Derating
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise. (in a decade of frequency)
Insulation resistance
Voltage proof
Pulse handling
∆
R %
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
µV/V
ohms
volts
2
Not Specified
zero at 155°C
0.5
2
55/125/56
2
0.5
0.5
0.5
Not specified
>1G
350 min
Actual Performance
Maximum
Typical
0.8
See Graph 1
0.5
See Graph 1
0.1
0.07
0.25
0.5
0.5
0.25
0.25
0.1
0.1
>1G
400 min
Data available upon request
0.03
0.2
0.3
0.05
0.02
0.01
0.07
>1G
400 min
* CECC requirements are included for reference only; CECC release is not available on MFR3
Graph 1 – Load for 1000 hours at 70°C: maximum changes
Performance Data - Type MFR 4
CECC 40101-019
Requirements
Load at commercial rating :
1000 hours at 70°C
Load at CECC rating :
1000 hours at 70°C
Shelf life :
12 months at room temperature
Derating
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise. (in a decade of frequency)
Insulation resistance
Voltage proof
Pulse handling
∆
R %
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
∆R
%
µV/V
ohms
volts
2
Not specified
zero at 155°C
0.5
2
55/125/56
2
0.5
0.5
0.5
Not Specified
>1G
500 min
1
Not Specified
CECC 40101-803
Requirements
Actual Performance
Maximum
Typical
0.8
0.5
0.1
See Graph 2
See Graph 2
0.07
0.01
0.2
0.3
0.04
0.07
0.01
0.1
>1G
500 min
zero at 155°C
0.25
0.25
1
0.5
55/125/56
1
0.5
0.25
0.25
0.25
0.25
0.25
0.1
Not Specified
0.1
>1G
>1G
400 min
500 min
Data available upon request
Graph 2 – Load for 1000 hours at 70°C: maximum changes
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information
© Welwyn
is subject to TT Electronics’ own
Bedlington,
considered accurate at time of going to print.
Components Limited
data and is
Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
136
© TT Electronics plc
01.18
Metal Film Resistors
Metal Film Resistors
MFR
Series
MFR
Series
Welwyn Components
Performance Data - Type MFR 5
CECC 40101-019
Requirements
Load at commercial rating :
1000 hours at 70°C
Load at CECC rating :
1000 hours at 70°C
Shelf life :
12 months at room temperature
Derating
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise. (in a decade of frequency)
Insulation resistance
Voltage proof
Pulse handling
∆R
%
∆R
%
∆R
%
∆R
%
µV/V
ohms
volts
∆R
%
∆R
%
∆
R %
∆R
%
∆R
%
2
Not specified
zero at 155°C
0.5
2
55/125/56
2
0.5
0.5
0.5
Not Specified
>1G
700 min
1
Not Specified
zero at 155°C
0.25
1
55/125/56
1
0.25
0.25
0.25
Not Specified
>1G
500 min
0.5
0.25
0.25
0.1
0.1
>1G
700 min
0.3
0.04
0.07
0.01
0.07
>1G
700 min
0.25
0.5
0.01
0.2
CECC 40101-803
Requirements
Actual Performance
Maximum
Typical
0.9
0.5
0.1
See Graph 3
See Graph 3
0.07
Data available upon request
Graph 3 – Load for 1000 hours at 70°C: maximum changes
Packaging
All MFR resistors are supplied tape packed ready for loading
on to automatic sequencing and insertion machines.
Component wires will not protrude beyond the outside edge
of the tapes.
Alternative packaging available by request.
Construction
The resistance element is a precisely controlled thin film of
metal alloy sputtered on to a high purity ceramic core,
protected by a moisture-resistant, high dielectric strength
coating applied so that terminations remain completely clear.
Terminations
Material
Hot tin dipped copper wire
The terminations meet the requirements of
IEC 68.2.21
Strength
5
f
1
6
52
f
1
– f
2
≤
1.4 mm
f
2
6
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2
Marking
0.5% and 1% tolerance resistors are colour coded with 5
bands. IEC 62 colours are used.
Lead Formed resistors can also be supplied. Standard options
of Lancet, Radial and Goalpost forming are available.
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.
© 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
© TT Electronics plc
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
01.18
137
Metal Film Resistors
MFR Series
Ordering Procedure
Example: MFR4-4K7FI
(Professional grade MFR4 at 4.7 kilohms ±1%, Pb-free)
M
F
1
1
Type
2
Value
R
4
-
4
K
2
7
F
3
3
Tolerance
D = ±0.5%
F = ±1%
C
I
PB
HL
MFR3, 4 Commercial
MFR4, 5 Professional
I
4
4
Grade, Finish & Packing
Pb-free (RoHS)
MFR3 E24 = 3/4 characters
MFR4 E96 = 4/5 characters
MFR5
R = ohms
K = kilohms
M = megohms
MFR3, 4
MFR5
CECC release is available only for professional grade Pb-free parts (code I).
For CECC released product state on order the CECC number and style.
Example:
MFR4-4K7FI CECC40101-019 FZ
Sn(95)Pb(5) finish
Sn(60)Pb(40) high lead finish
All above in Standard Packing
5000/box
Ammo
2500/box
Commercial Grade
Professional Grade. CECC release is available within range
indicated in Electrical Data.
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
www.ttelectronics.com/resistors
© TT Electronics plc
11.09
01.18
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