METAL FILM
MF
EU
RoHS
Coat-Insulated Fixed Metal Film Resistors
■Construction
C
①
②
③
④
⑤
φd
⑥
L
⑦
D
① Marking
⑤ Electrode cap
② Insulation coating ⑥ Lead wire
③ Trimming line
⑦ Resistive film
④ Ceramic core
Coating color：Light gray
Marking：Color code
■Features
・
High precision and low T.C.R. metal film resistors.
・
Automatic insertion is applicable.
・
Various formings are available.
・
Excellent stability for a long time.
・
Products meet EU-RoHS requirements.
・
AEC-Q200 Tested (Exemption MF1/2).
■Dimensions
Type
MFS1/4
MF1/4
MFS1/2
MF1/2
L
3.2±0.2
6.3±0.5
9.0±1.0
C Max.
3.4
7.1
11.1
Dimensions（mm）
D
d Nominal）
（
1.7
＋0.2
0.45
－0.1
2.3±0.3
3.5±0.4
0.60
ℓ±3
※1
28
Weight
（g）
（1000pcs）
120
215
215
360
※1 Lead length changes depending on taping and forming type.
■Reference Standards
Low Power Type Resistors
IEC 60115-1
JIS C 5201-1
EIAJ RC-2137
■Type Designation
Example
MF
Product
Code
1/4
Power
Rating
S1/4：0.25W
1/4：0.25W
S1/2：0.5W
1/2：0.5W
D
T.C.R.
（×10
−6
/K）
C：±50
D：±100
L：±200
C
Terminal
Surface Material
C：SnCu
T52
Taping &
Forming
See table
below
A
Packaging
A：AMMO
R：REEL
Nil: BOX
1002
Nominal
Resistance
D, F：4 digits
G：3 digits
F
Resistance
Tolerance
D
：±0.5％
F：±1％
G
：±2％
Contact us when you have control request for environmental hazardous material other than the substance specified by
EU-RoHS.
For further information on taping and forming, please refer to APPENDIX C on the back pages.
■Taping & Forming Matrix
Type
MFS1/4□C
MF1/4□C
MFS1/2□C
MF1/2□C
Axial Taping
T26
T52
○
○
○
○
○
○
－
○
VT
○
○
○
－
Radial Taping
VTP
VTE
－
－
○
○
○
○
－
－
MT
○
－
－
－
U Forming
U
○
○
－
－
M5
M5F
－
－
－
M5R
－
－
－
M Forming
M10
－
M10F
M10R
－
M12.5
－
M12.5R
－
M12.5R
M15
－
－
－
M15R
□：T.C.R.
■Ratings
Type
MFS1/4CC
MFS1/4DC
MF1/4CC
MF1/4DC
MF1/4LC
MFS1/2CC
MFS1/2DC
MF1/2CC
MF1/2DC
MF1/2LC
Power
Rating
0.25W
0.25W
0.5W
0.5W
T.C.R.
（×10
−6
/K）
C：±50
D：±100
C：±50
D：±100
L ：±200
C：±50
D：±100
C：±50
D：±100
L ：±200
Resistance Range
（Ω）
D：±0.5％
E24・E192
49.9½562k
10½2.21M
－
10½1M
10½5.05M
－
F：±1％
E24・E96
10½1M
10½2.21M
1.0½10
10½2.2M
10½4.99M
10½5.11M
1.0½10
G：±2％
E24
－
－
0.51½10
10½2.2M
－
0.51½10
350V
700V
700V
－
250V
500V
500V
Max.
Working
Voltage
Max.
Overload
Voltage
Dielectri
Withstanding
Voltage
300V
Taping & Q'ty/AMMO
（pcs）
T26A
3,000
3,000
2,000
2,000
2,000
2,000
2,000
T52A
3,000
3,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
2,000
Rated Ambient Temperature :＋70℃
Operating Temperature Range :−55℃∼＋155℃
Rated voltage＝
√￣￣￣￣￣￣￣￣￣￣￣￣
or Max. working voltage, whichever is lower.
Power Rating×Resistance value
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Jun.
2021
Oct.
2021
www.koaglobal.com
■Derating Curve
Percent rated power ％ ）
（
100
80
60
40
20
0
-60 -40 -20
-55
0
20 40 60 80 100 120 140 160
70
155
Ambient temperature
（℃）
For resistors operated at an ambient temperature of 70℃ or higher, the power shall be derated
in accordance with the above derating curve.
■Performance
Performance Requirements
Test Items
Resistance
T.C.R.
Overload
（Short time）
Resistance to soldering heat
Rapid change of temperature
Moisture resistance
Endurance at 70℃
ΔR±
（％＋0.05Ω）
Limit
Within specified tolerance
Within specified T.C.R.
0.5
0.75：MFS1/4
0.5：MF1/4, MFS1/2, MF1/2
1.0
1.5：MFS1/4
1：MF1/4, MFS1/2, MF1/2
1.5：MFS1/4
1：MF1/4, MFS1/2, MF1/2
Typical
—
—
0.3
0.4：MFS1/4
0.25：MF1/4, MFS1/2, MF1/2
0.3
1：MFS1/4
0.75：MF1/4, MFS1/2, MF1/2
1：MFS1/4
0.75：MF1/4, MFS1/2, MF1/2
25℃
＋25℃/＋125℃
Rated voltage×2.5 or Max. overload vol., whichever is lower, for 5s：MFS1/4, MF1/4, MF1/2
Rated voltage×2 or Max. overload vol., whichever is lower, for 5s：MFS1/2
260℃±5℃, 10s±1s
－55℃
（30min.）/＋155℃
（30min.）5 cycles
40℃±2℃, 90%½95%RH, 1000h
1.5h ON/0.5h OFF cycle
70℃±2℃, 1000h
1.5h ON/0.5h OFF cycle
Test Methods
Low Power Type Resistors
Low Power Type Resistors
■Precautions for Use
・
Ionic impurities such as flux etc. that are attached to these products or those mounted onto a PCB, negatively affect their moisture resistance, corrosion
resistance, etc. The flux may contain ionic substances like chlorine, acid, etc. Please wash them to get rid of these ionic substances especially when using lead-
free solder that may contain much of the said substances for improving a wetting characteristic. Using RMA solder or RMA flux, or well-washing is needed. Also,
attaching ionic substances such as perspiration, salt etc. by storage environments or mounting conditions/environments negatively affects their moisture
resistance, corrosion resistance etc. Please wash them to remove the ionic substances when they are polluted.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage.
Jun.
2021
Oct.
2021
www.koaglobal.com
Power technology
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