EU
RoHS
CARBON FILM
CF Coat-Insulated Fixed Carbon Film Resistors
Construction
C
T T
L D
Marking Electrode cap
Insulation coating Lead wire
Trimming line Resistive film
Ceramic core
CFS1/4
Dimensions
Coating colorCFS1/4-Ivory Others-venetian red
Dimensions mm
3 Weight (g)
Marking : Color code
Type L C Max. D d (Nominal) (1000pcs)
Standard Long
+0.2
CFS1/4 3.20.2 3.4 1.7 0.45 80
Features 0.1
1 2
14 min. 20 min.
CF1/4 6.10.5 7.1 2.30.3 0.6 160
z
CFS1/2 6.30.5 7.1 2.850.3 0.6 290
20 min.
z
CFB1/2 9.0 1.0 11.0 3.5 0.5 0.7 520
z
1 S 3
z 1 Forming code S is applied for bulk type. 3 Lead length changes depending on taping and forming type.
2 Long
z 1/4W CFS 1/4
2 Long type is custom-made.
z RoHS
z General-purpose lead-type resistors.
Type Designation
z Automatic insertion is applicable.
Example
z Various types of formings are available.
CF 1/4 C T52 A 103 J
z Stronger in pulse resistance than chip resistors of the same power.
z The smaller type of 1/4W(CFS 1/4) is available.
Product Power Terminal Taping & Packaging Nominal Resistance
z Products meet EU-RoHS requirements.
Code Rating Surface Material Forming Resistance Tolerance
S1/4 : 0.25W C : SnCu A : AMMO 3 digits G:2%
Reference Standards
1/4 : 0.25W See table A : AMMO J :5%
IEC 60115-2 B1/2 : 0.5W below R :
S1/2 : 0.5W R : REEL
JIS C 5201-2
:
EIAJ RC-2136 Nil : BOX
EU-RoHS
C
Contact us when you have control request for environmental hazardous material other than the substance
specified by EU-RoHS.
For further information on taping, please refer to APPENDIX C on the back pages.
Taping & Forming Matrix
U M
Straight Axial Taping Radial Taping U Forming M Forming
Type
S Nil T26 T52 VT MT MHT VTP VTE U UCL M5 M10 M12.5 M12.5
1 2
CFS 1/4 M5F
1 2
CF 1/4 M10H M12.5H
CFS 1/2 M10H
CFB 1/2 M12.5K
Ratings
/AMMO
-6
Power Resistance RangeE24 T.C.R.10 /K Max. Working Max. Overload Dielectric Taping & Q'ty/AMMO (pcs)
Type
Rating 350450 0700 01000 01300 Voltage Voltage Withstanding Voltage T26A T52A
G: 2% J:5%
CFS 1/4 0.25W 10330k 2.21M 2.247k 51k100k 110k330k 360k1M 250V 500V 300V 5,000 3,000
CF 1/4 0.25W 2.2 5.1M 2.2 100k 110k 330k 360k 1M 1.1M 5.1M 300V 600V 500V
2,000
CFS 1/2 0.5W 101M 1.05.1M 1.091k 100k1M 1.1M2.2M 2.4M5.1M 350V 700V 2,000
700V
CFB 1/2 0.5W 2.25.1M 2.2100k 110k1M 1.1M2.2M 2.4M5.1M 400V 800V
Rated Ambient Temperature +70
Operating Temperature Range-55 +155
Rated voltage = Power RatingResistance value or Max. working voltage, whichever is lower.
Nov. 2018
Specications given herein may be changed at any time without prior notice. Please conrm technical specications before you order and/or use.
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.
www.koaglobal.com
Low Power Type Resistors
d
Low Power Type Resistors
Derating Curve
70
100
For resistors operated at an ambient temperature of 70C or above, a power rating shall be
derated in accordance with the left derating curve.
80
60
40
20
0
-60 -40 -20 0 20 40 60 80 100 120 140 160
-55 70 155
Ambient temperature C
Surface Temperature Rise Load Life At 701000Hr
+2
60
CFS1/4
50
+1
CFS1/2
40
CFB1/2
CFS1/4
30 0
CF1/4
20
-1
10
0
-2
0 25 50 75
100 10 100 1k 10k 100k 1M
Power Rating Ratio Resistance
Performance
Performance Requirements
R0.05
Test Items Test Methods
Limit Typical
10mm1mm
Resistance Within specied tolerance Measuring points are at 10mm1mm from the end cap.
25/125
T.C.R. Within specied T.C.R.
2.55
1 0.5 Rated voltage2.5 or Max. overload vol., whichever is lower, for
OverloadShort time
5s.
1 0.5 2605, 10s1s
Resistance to soldering heat
No lead-coming off and loose Twist 360, 5 times
Terminal strength
terminals
1 0.5 5530min./12530min.5 cycles
Rapid change of temperature
40 2 , 90% 95%RH, 1000h
5 2.5
Moisture resistance 1.5 ON 0.5 OFF 1.5h ON/0.5h OFF cycle
70 702, 1000h
3 1.5
Endurance at 70 1.5ON0.5OFF 1.5h ON/0.5h OFF cycle
Precautions for Use
z
RMA
z 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.
Nov. 2018
Specications given herein may be changed at any time without prior notice. Please conrm technical specications before you order and/or use.
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.
www.koaglobal.com
Percent rated power
Surface temp. rise
R/R