Stronger in pulse resistance than chip resistors of the same
power.
・
The smaller type of 1/4W(CFS 1/4) is available.
・
Products meet EU-RoHS requirements.
■Dimensions
Type
CFS1/4
CF1/4
CFS1/2
CFB1/2
Dimensions（mm）
L
3.2±0.2
6.1±0.5
6.3±0.5
9.0±1.0
C Max.
3.4
7.1
7.1
11.0
D
1.7
＋0.2
－0.1
2.3±0.3
2.85±0.3
3.5±0.5
d Nominal）
（
0.45
0.60
0.60
0.70
ℓ
※3
Standard
Long
14min.
※1
20min.
20min.
※2
－
－
（
Weight g
）
（
1000pcs
）
80
160
290
520
※1 Forming code S is applied for bulk type. ※3 Lead length changes depending on taping and forming type.
※2 Long type is custom-made
■Reference Standards
Low Power Type Resistors
IEC 60115-2
JIS C 5201-2
EIAJ RC-2136
■Type Designation
Example
CF
Product
Code
1/4
Power
Rating
S1/4 : 0.25W
1/4 : 0.25W
S1/2 : 0.5W
B1/2 : 0.5W
C
Terminal
Surface Material
C : SnCu
T52
Taping &
Forming
See table
below
A
Packaging
A : AMMO
R : REEL
Nil : BOX
103
Nominal
Resistance
3 digits
J
Resistance
Tolerance
G : ±2%
J : ±5%
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
CFS 1/4C
CF 1/4C
CFS 1/2C
CFB 1/2C
Straight
S
○
—
—
※1
※1
Axial Taping
Nil
○
○
○
○
※2
※2
Radial Taping
VT
○
○
○
—
MT
○
—
—
—
MHT
○
—
—
—
VTP
—
○
○
—
VTE
—
○
○
—
U Forming
U
○
—
○
—
UCL
—
○
—
—
M5
M5F
—
—
—
M Forming
M10
—
M10H
M10H
—
M12.5
—
M12.5H
—
—
M12.5
—
—
—
M12.5K
T26
○
○
○
—
T52
○
○
○
○
○
■Ratings
Type
CFS 1/4C
CF 1/4C
CFS 1/2C
CFB 1/2C
Power
Rating
0.25W
0.25W
0.5W
0.5W
10½1M
Resistance Range
（Ω）
E24
G：±2％
10½330k
J：±5％
2.2½1M
2.2½5.1M
1.0½5.1M
2.2½5.1M
＋350∼−450
2.2Ω½47kΩ
1.0Ω½91kΩ
T.C.R.（×10
−6
/K）
0∼−700
0∼−1000
0∼−1300
1.1MΩ½5.1MΩ
51kΩ½100kΩ 110kΩ½330kΩ 360kΩ½1MΩ
100kΩ½1MΩ
1.1MΩ½2.2MΩ 2.4MΩ½5.1MΩ
1.1MΩ½2.2MΩ 2.4MΩ½5.1MΩ
Max. Working Max. Overload Dielectric Withstanding
Voltage
Voltage
Voltage
250V
300V
350V
400V
500V
600V
700V
800V
300V
500V
700V
Taping & Q'ty/AMMO
（pcs）
T26A
5,000
2,000
—
T52A
3,000
2,000
2.2Ω½100kΩ 110kΩ½330kΩ 360kΩ½1MΩ
2.2Ω½100kΩ 110kΩ½1MΩ
Rated Ambient Temperature : ＋70℃
Operating Temperature Range : −55℃∼＋155℃
Rated voltage＝ Power Rating×Resistance value or Max. working voltage, whichever is lower.
√￣￣￣￣￣￣￣￣￣
132
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.
Oct. 2020
Oct. 2021
www.koaglobal.com
■Derating Curve
Percent rated power（％）
100
80
60
40
20
0
-60 -40 -20 0 20 40 60 80 100 120 140 160
-55
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.
■Surface Temperature Rise
Surface temp. rise（℃）
50
40
30
20
10
0
0
25
■Load Life At 70℃ 1000Hr
＋2
R/R（％）
CFS1/2
CFB1/2
CFS1/4
CF1/4
CFS1/4
Surface temp. rise（℃）
60
60
50
40
30
20
10
0
50
0
75
25
100
50
＋2
＋1
0
－1
CFS1/4
CFB1/2
CFS1/4
0
CF1/4
－1
－2
10
R/R（％）
CFS1/2
＋1
Low Power Type Resistors
Low Power Type Resistors
75
100
100
1k
－2
10k
10
100k
100
1M
1k
10k
100k
1M
Power Rating Ratio
Power Rating Ratio
（％）
（％）
Resistance（Ω）
Resistance（Ω）
■Performance
Performance Requirements
Test Items
Resistance
T.C.R.
Overload
（Short time）
Resistance to soldering heat
Terminal strength
Rapid change of temperature
Moisture resistance
Endurance at 70℃
ΔR±
（％＋0.05Ω）
Limit
Within specified tolerance
Within specified T.C.R.
1
1
No lead-coming off and loose terminals
1
5
3
Typical
—
—
0.5
0.5
—
0.5
2.5
1.5
Measuring points are at 10mm±1mm from the end cap.
＋ 25℃/＋ 125℃
Rated voltage×2.5 or Max. overload vol., whichever is lower, for 5s.
260℃±5℃, 10s±1s、350℃±10℃, 3.5s±0.5s
Twist 360°, 5 times
－55℃
（30min.）/＋125℃
（30min.） cycles
5
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
■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.
