Nichrome resistor element provides stable performance in various environments.
•
Multiple epoxy coating on vacuum-deposited metal film provides superior moisture protection.
Dimension:
Style
MF 12
MF 25
MF 50
Power Rating
at 70°C
(W)
0.125
0.25
0.5
D Maximum
1.85
2.5
3.5
L Maximum
3.5
6.8
10.0
d
+0.02
-0.05
0.45
0.54
H±3
28.0
Dimensions : Millimetres
Supplied bandoliered on tape (Box = 5000 pcs. for MF12 and MF25 Series)
(Box = 1000 pcs. for MF50 Series).
General Specification
Style
MF 12
MF 25
MF 50
Dielectric
withstanding
voltage (V)
400
500
700
Maximum
working
voltage (V)
200
250
350
Maximum
overload
voltage (V)
400
500
700
Dimensions : Millimetres
Resistance
Tolerance
Temperature
Coefficient
Resistance
Range
±1%
±50ppm/°C
1Ω to 1MΩ
Page 1
10/05/05 V1.0
MF12, MF25 & MF50 Series
Metal Film Resistors
Current Noise Level
Derating Curve
+0.8
Load Life
Percent rated load (%)
+0.4
∆R/R
(%)
0
-0.4
-0.8
100Ω
1KΩ
10KΩ
100KΩ
1MΩ
Nominal resistance (Ω)
Ambient temperature (°C)
Performance Specification
Characteristics
Test Methods
Natural resistance change per temperature degree centigrade.
R
2
- R
1
Temperature
coefficient
R
1
(
t2-t1
)
X 10 (ppm/°C)
6
Limits
Within the temperature coefficient specified
below
Maximum TCR
±50ppm/°C
No evidence of flashover mechanical
damage, arcing or insulation break down.
R
1
: Resistance value at room temperature (t
1
)
R
2
: Resistance value at room temperature plus 100°C (t
2
).
Dielectric
withstanding
voltage
Resistors shall be clamped in the trough of a 90° metallic
V-block and shall be tested at AC potential respectively
specified in the above list for 60 +10/-0 seconds.
Resistance change after continuous five cycles for duty cycle
specified
Step
Temperature
-55°C ±3°C
Room temperature
+155°C ±3°C
Room temperature
Time
30 minutes
10-15 minutes
30 minutes
10-15 minutes
1
2
3
4
Temperature
cycling
Resistance change rate is ±(1% +0.05Ω).
No evidence of mechanical damage.
Short-time
overload
Permanent resistance change after the application of a
potential of 2.5 times RCWV for 5 seconds.
Resistance change after 10,000 cycles (1 second "on", 25
seconds "off") at 4 times RCWV.
Resistance change rate is ±(0.5% +0.05Ω).
No evidence of mechanical damage.
Resistance change rate is ±(1% +0.05Ω).
No evidence of mechanical damage.
Pulse overload
Page 2
10/05/05 V1.0
MF12, MF25 & MF50 Series
Metal Film Resistors
Performance Specification
Characteristics
Test Methods
Resistance change after 1000 hours (1.5 hours "on", 0.5
Load life in humidity
hour "off") at RCWV in a humidity test chamber controlled at
40°C ±2°C and 90 to 95% relative humidity.
Permanent resistance change after 1000 hours operating at
Load life
RCWV with duty cycle of 1.5 hours "on" 0.5 hours "off" at
70°C ±2°C ambient.
Direct Load:
Resistance to a 2.5kgs direct load for 10
seconds in the direction of the longitudinal axis of the
terminal leads.
Terminal strength
Twist test:
Terminal leads shall be bent through 90° at a
point of about 6mm from the body of the resistor and shall
be rotated through 360° about the original axis of the bent
terminal in alternating direction for a total of 3 rotations.
Resistance to
soldering heat
Permanent resistance change when leads immersed to
3.2 - 4.8mm from the body in 350°C ±10°C solder for
3 ±0.5 seconds.
The area covered with a new, smooth, clean, shiny and
Solderability
continuous surface free from concentrated pinholes.
Test temperature of solder
Dwell time in solder
Resistance to
solvent
: 235°C ±5°C.
: 3+0.5/-0 seconds.
No deterioration of protective coating and
markings.
95% coverage Minimum.
Resistance change rate is ±(1% +0.05Ω).
No evidence of mechanical damage.
No evidence of mechanical damage.
Limits
Resistance Value
Normal type
Resistance Value
Normal type
∆
R/R
±1.5%
∆
R/R
±1.5%
Specimens shall be immersed in a bath of trichroethane
completely for 3 minutes with ultrasonic.
RCWV = Rated Continuous Working Voltage =
√
Rated Power X Resistance Value
Page 3
10/05/05 V1.0
MF12, MF25 & MF50 Series
Metal Film Resistors
Part Number Explanation:
MF
12
1R5
Type
Wattage Rating
OHMIC Values
Wattage Rating
: 12 = 0.125W, 25 = 0.25W and 50 = 0.5W.
OHMIC Values
: Where R = Ohms =
Ω
K = Kilo ohms = KΩ.
M = Mega ohms = MΩ.
and replaces the decimal point.
eg : 1R5 = 1.5Ω.
4K5 = 4.5KΩ.
6M8 = 6.8MΩ.
Stocked Values
Tolerance
1%
1%
1%
Wattage
0.125W
0.25W
0.5W
Range Value
1R - 1M
1R - 1M
1R - 1M
Page 4
10/05/05 V1.0
MF12, MF25 & MF50 Series
Metal Film Resistors
Notes:
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Disclaimer
This data sheet and its contents (the "Information") belong to the Premier Farnell Group (the "Group") or are licensed to it. No licence is granted for the use of it other than for information purposes
in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change without notice and replaces all data sheets previously supplied.
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