UniOhm
Feature
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Precision Metal Film Fixed Resistors
RoHS Compliant
EIA standard color coding
Flame retardant type available
Low noise & voltage coefficient
Low temperature coefficient range
Multiple epoxy coating on vacuum-deposited metal film provides superior moisture protection
Nichrome resistor element provides stable performance in various environments
Part No.
Normal Size
MFR0W8
MFR0W4
MFR0W2
MFR01W
MFR02W
MFR03W
Type
Power
Rating At
70°C
Dimension (mm)
D Max.
L Max.
d
+0.02
- 0.05
H±3
Derating Curve
MF-12
MF-25
MF-50
MF-100
MF-200
MF-300
1/8W
1/4W
1/2W
1W
2W
3W
1.85
2.5
3.5
5
5.5
6.5
3.5
6.8
10
12
16
17.5
0.5
0.6
0.6
0.7
0.8
0.8
28
28
28
28
28
28
Ambient temperature (
°
C)
Small Size & Extra Small Size
MFR0S4
MFR004
MFR0U2
MFR0S2
MFR006
MF-25-S
MF-40-SS
MF-50-SS
MF-50-S
MF-60-S
1/4W
0.4W
1/2W
1/2W
0.6W
2
2
3
3
3
3.5
3.7
6.8
9
6.8
0.5
0.5
0.6
0.6
0.6
28
28
28
28
28
Load Life
Standard Non-Flammable coating for Small size types (except MF-50-S).
Part No.
MFR0W8
MFR0S4
MFR004
MFR0W4
MFR0U2
MFR006
MFR0S2
MFR0W2
MFR01W
MFR02W
MFR03W
Type
MF-12
MF-25-S
MF-40-SS
MF-25
MF-50-SS
MF-60-S
MF-50-S
MF-50
MF-100
MF-200
MF-300
Dielectric
With-
standing V.
400V
200V
500V
250V
Max.
Working
V.
200V
200V
250V
250V
Max.
Overload
V.
400V
400V
500V
500V
Standard Order
Tol.
±1%
±2%
±5%
±1%
±2%
±5%
±1%
T.C.R
± 50
± 100
± 200
± 50
± 100
± 200
± 50
± 100
± 200
± 50
± 100
± 200
Value Range
10Ω-1MΩ
10Ω-1MΩ
1Ω-1MΩ
10Ω-1MΩ
1Ω-1MΩ
1Ω-1MΩ
10Ω-1MΩ
10Ω-1MΩ
1Ω-1MΩ
51.1Ω-1MΩ
51.1Ω-1MΩ
1Ω-1MΩ
Tol.
± 0.25%
± 0.5%
± 0.5%
± 0.1%
± 0.25%
± 0.5%
± 0.1%
± 0.25%
± 0.5%
± 0.1%
± 0.25%
± 0.5%
Special Order
T.C.R.
± 15
± 25
± 50
± 15
± 25
± 50
± 15
± 25
± 50
± 15
± 25
± 50
Value Range
51.1Ω ~ 200KΩ
51.1Ω ~ 511KΩ
51.1Ω ~ 511KΩ
10Ω ~ 1MΩ
10Ω ~ 1MΩ
10Ω ~ 1MΩ
100Ω ~ 330KΩ
51.1Ω ~ 511KΩ
10Ω ~ 1MΩ
100Ω~ 330KΩ
51.1Ω ~ 511KΩ
51.1Ω ~ 1MΩ
700V
350V
700V
±2%
±5%
±1%
1000V
500V
1000V
±2%
±5%
16
Precision Metal Film Fixed Resistors
Performance Specifications
Temperature coefficient
Short-time overload
Dielectric withstanding voltage
Pulse overload
Terminal strength
Resistance to Soldering heat
Solderability
Resistance to solvent
Temperature cycling
Load life in humidity
Load life
Within the maximum temperature coefficient specified in page 16.
∆R/R ≤ ±(0.5%+0.05Ω), with no evidence of mechanical damage.
No evidence of flashover, mechanical damage, arcing or insulation breakdown.
∆R/R ≤ ±(1%+0.05Ω), with no evidence of mechanical damage.
No evidence of mechanical damage.
∆R/R ≤ ±(1%+0.05Ω), with no evidence of mechanical damage.
Min. 95% coverage.
No deterioration of protective coating and markings.
∆R/R ≤ ±(1%+0.05Ω), with no evidence of mechanical damage.
Normal type: ∆R/R ≤ ±1.5%; Flame retardant type: ∆R/R ≤ ±5%.
Normal type: ∆R/R ≤ ±1.5%; Flame retardant type: ∆R/R ≤ ±5%.
UniOhm
Current Noise Level:
Ordering Procedure (Example: MFR 1/8W 1% 50PPM 47.5KΩ T/R-5000)
M F R 0 W 8 F 4 7 5 2 T 5 0
Product Type:
MFR = Metal Film Fixed
Resistors
Wattage:
Normal size:
W8 = 1/8W
W4 = 1/4W
W2 = 1/2W
1W = 1W
2W = 2W
Small size:
S4 = 1/4W-S
S2 = 1/2W-S
06 = 0.6W-S
Extra small size:
U2 = 1/2W-SS
04 = 0.4W-SS
Resistance Value:
E-24 series (2% & 5% Tol.):
The 1st digit will be “0”; the
2nd & 3rd digits are for the
significant figures of the resistance
and the 4th digit indicate the
numbers of zeros following
E-96 series (1% Tol.) :
The 1st digit to 3rd digit are for
the significant figures of the resis-
tance and the 4th digit denotes
number of zero following
Packing Type:
A = Tape/Box,
T = Tape/Reel
B = Bulk/Box,
P = Tape/Box of
PT-26 product
Special Features:
0 = Standard product
F = Flame Retardant
I = Non - Inductive
Tolerance:
B=±0.1% 15PPM, C=±0.25% 25PPM,
D=±0.5% 50PPM, F=±1% 50PPM,
G=±2% 100PPM, J=±5% 200PPM
For special tolerance – PPM requirement. Please
indicate it in the purchase order (P
.O.)
Example : ±1% 15PPM
Packing Quantity:
1 = 1,000pcs
2 = 2,000pcs
3 = 3,000pcs
4 = 4,000pcs
5 = 5,000pcs
A = 500pcs
B = 2,500pcs,
0 = for Bulk/Box
packing
Additional Information:
0 = NIL
17
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