（
THICK FILM ANTI SULFURATION
）
Flat Chip Resistors
EU
RoHS
RK73B
・
RK73H
・
RK73Z-RT
RK73Z
RK73H
RK73B
Coating Color：
Black
（RK73B 1F, 1H, 1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2）
（RK73H 1F, 1H）RK73Z 1J, 2A, 2B, 2E, W2H, W3A）
（
Blue RK73H 1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2）
（
Green RK73Z 1H, 1E）
（
t
W
Flat Chip Resistors (Anti Sulfuration)
c
L
c
■Construction
⑥
⑤
④
d
①
②
③
①
Protective coating ④
Ni plating
②
Resistive film
⑤
Sn plating
③
Inner electrode
⑥
Ceramic substrate
■Dimensions
Type
（Inch Size Code）
1F
（01005）
1H
（0201）
1E
（0402）
1J 0603）
（
2A
（0805）
2B
（1206）
2E
（1210）
W2H
（2010）
W3A
（2512）
※1
W3A2 2512）
（
※1 Exemption RK73Z
■Features
・
Excellent anti-sulfuration characteristic due to using high
sulfuration-proof inner top electrode material.
・
Excellent heat resistance and weather resistance are
ensured by the use of metal glaze thick film.
・
High stability and high reliability with the triple-layer
structure of electrode.
・
Suitable for both flow and reflow solderings.
・
This products meet EU-RoHS requirements. EU-RoHS
regulation is not intended for Pb-glass contained in
electrode, resistor element and glass.
・
AEC-Q200 Tested. (Exemption 1F)
L
0.4±0.02
0.6±0.03
1.0
＋0.1
－0.05
1.6±0.2
2.0±0.2
3.2±0.2
5.0±0.2
6.3±0.2
Dimensions（mm）
Weight
（g）
（1000pcs）
W
c
d
t
0.2±0.02
0.1±0.03 0.11±0.03 0.13±0.02
0.04
0.3±0.03
0.1±0.05 0.15±0.05 0.23±0.03
0.14
0.5±0.05
0.2±0.1
0.25
＋0.05
0.35±0.05
0.68
－0.1
0.8±0.1
0.3±0.1
0.3±0.1
0.45±0.1
2.14
（％）
0.5±0.1
4.54
1.25±0.1
0.4±0.2
0.3
＋0.2
－0.1
9.14
1.6±0.2
0.4
＋0.2
－0.1
2.6±0.2
15.5
0.6±0.1
0.5 ±0.3
2.5±0.2
24.3
0.65±0.15
3.1±0.2
37.1
■Type Designation
Example
RK73H
Product
Code
RK73B
RK73H
2A
Power
Rating
1F : 0.03W
1H : 0.05W
1E : 0.1W
1J : 0.1W
0.125W
2A : 0.25W
2B : 0.25W
2E : 0.5W
W2H : 0.75W
W3A : 1W
W3A2 : 2W
※3
R
Characteristic
R：Anti
sulfuration
T
Terminal
Surface Material
T：Sn
TD
Taping
TX:4mm width-1mm pitch
plastic embossed
TBL TCM:2mm pitch
・
press paper
TPL TP:2mm pitch
・
punch paper
TD:4mm pitch
punch paper
TE:4mm pitch
plastic
embossed
BK:Bulk
1002
Nominal
Resistance
RK73B : 3 digits
RK73H: 4 digits
F
Resistance
Tolerance
D : ±0.5%
F : ±1%
G: ±2%
J : ±5%
■Applications
・
Car electronics, Power supply, Industrial robot
■Reference Standards
IEC 60115-8
JIS C 5201-8
EIAJ RC-2134C
RK73Z
Product
Code
RK73Z
2A
Current
Rating
1H : 0.5A
1E : 1A
1J : 1A
2A : 2A
2B : 2A
2E : 2A
W2H: 2A
W3A : 2A
R
Characteristic
R：Anti
sulfuration
T
Terminal
Surface Material
T：Sn
TD
Taping
TCM: 2mm pitch
press paper
TPL TP: 2mm pitch
・
punch paper
TD:4mm pitch
punch paper
TE:4mm pitch
plastic
embossed
BK:Bulk
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.
■Derating Curve
Percent rated power for RK73B, RK73H（％）
Percent rated current for RK73Z（％）
Percent rated power for RK73B, RK73H（％）
Percent rated current for RK73Z（％）
RK73B・RK73H・RK73Z-RT
Ambient temperature
100
80
60
40
20
0
-60
-55
-40 -20
0
20
40
60
70
80 100 120
125
140
160
155
1F
1H,1E,1J,2A,2B
2E,W2H,W3A
（1W）
,
W3A2 2W）
（
RK73B・RK73H・RK73Z-RT
Terminal part temperature
100
80
60
40
20
0
-60
-55
-40
-20
0
20
40
60
80
100 120 140 160
125
155
RK73B・RK73H-RT
Terminal part temperature W3A2
100
Percent rated power ％）
（
1H,1E,1J,2A,2B,2E,
W2H,W3A
（1W）
80
60
40
20
0
-60 -40 -20
-55
0
20
40
60
80
100 120 140 160
155
Ambient temperature（℃）
Terminal part temperature
（℃）
95
Terminal part temperature
（℃）
For resistors operated at an ambient temperature of 70℃ or
higher, the power (for RK73B, RK73H) or a current rating (for
RK73Z) shall be derated in accordance with the above derating
curve.
When the terminal part temperature of the resistor exceeds the rated terminal part temperature shown above, the power shall be
derated according to the derating curve.
※Please refer to Introduction of the derating curves based on the terminal part temperature” the beginning of our catalog before use.
“
on
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.
Aug.
2021
Oct.
2021
www.koaglobal.com
■Ratings
RK73B, RK73H
Type
Power
Rating
0.03W
0.05W
0.1W
0.1W
0.125W
0.25W
0.25W
0.5W
0.75W
1W
2W
※3
Flat Chip Resistors
Flat Chip Resistors
Rated
Ambient
Temp.
70℃
70℃
70℃
70℃
70℃
70℃
70℃
70℃
70℃
70℃
Rated
Terminal
Part Temp.
－
125℃
125℃
125℃
125℃
125℃
125℃
125℃
125℃
95℃
T.C.R.
（×10
−6
/K）
±200
±250
0½＋300
±200
±300
±100
±200
±100
±200
±100
±200
±100
±200
±100
±200
±100
±200
±100
±200
±100
±200
±100
±200
RK73H
D：±0.5％
E24・E96
－
100½100k
－
100½1M
－
1.02k½1M
－
100½1k
－
100½1M
－
100½1M
－
100½1M
－
10½1M
－
10½1M
－
10½1M
－
Resistance Range
（Ω）
F：±1％
E24・E96
G：±2％
E24
100k½1M
10½91k
1½9.1
－
RK73B
J：±5％
E24
100k½10M
10½91k
1½9.1
100½1M
10½91
－
1½10M
－
1.1k½10M
－
1½1k
－
1½10M
－
1½10M
－
1½1M
－
1½10M
－
1½10M
－
1½10M
Max.
Working
Voltage
20V
25V
Max.
Overload
Voltage
30V
50V
Packaging & Q'ty/Reel
（pcs）
TX
40,000
－
－
TBL
20,000
－
－
－
－
－
－
－
－
－
TCM
－
15,000
－
－
－
－
－
－
－
－
TPL TP
・
－
－
TPL：20,000
TP ：10,000
TP ：10,000
TP ：10,000
－
－
－
－
－
TD
－
－
－
5,000
5,000
5,000
5,000
－
－
－
TE
－
－
－
－
4,000
※4
4,000
※4
4,000
※4
4,000
4,000
4,000
1F
1H
1E
1J
2A
2B
2E
W2H
W3A
W3A2
100k½2M
※2
10½91k
※2
－
100½1M
10½97.6
10½1M
1.02M½10M
.1.02k½1M
1.02M½10M
10½1k
－
10½1M
1.02M½10M
10½1M
1.02M½10M
10½1M
－
10½1M
1½9.76
1.02M½10M
10½1M
1.02M½10M
10½1M
1.02M½10M
－
10½10M
－
1.1k½10M
－
10½1k
－
10½10M
－
10½10M
－
10½1M
－
1½10M
－
10½10M
－
10½10M
75V
100V
－
－
－
－
150V
200V
200V
400V
－
－
200V
400V
－
Operating Temperature Range：−55℃∼＋125℃
（1F） −55℃∼＋155℃ ・ ・ ・ ・ ・ ・
、
（1H 1E 1J 2A 2B 2E W2H W3A W3A2）
・
・
Rated voltage＝
√￣￣￣￣￣￣￣￣￣￣￣￣
or Max. working voltage, whichever is lower.
Power Rating×Resistance value
※2 The nominal resistance value for RK73H1F (F:±1%) is E24.
※3 If you use at the rated power, please keep the condition that the terminal of the resistor is below the rated terminal part temperature. Please refer to the derating curves based on the terminal
temperature of right side on the previous page.
※4 Standard packaging：TD(4mm pitch punch paper)
If any questions arise whether to use the Rated Ambient Temperature” the Rated Terminal Part Temperature” your usage conditions, please give priority to the Rated Terminal Part Temperature”
“
or “
in
“
.
For more details, please refer to Introduction of the derating curves based on the terminal part temperature” the beginning of our catalog.
“
on
While using under high power, the temperature of the product may increase depending on the condition of heat dissipation from PCB.
Be sure to check the terminal part temperature as well as precausions to use on delivery specifications before use.
RK73Z
Type
1H
1E
1J
2A
2B
2E
W2H
W3A
70℃
125℃
50mΩmax.
2A
10A
5A
－55℃½＋155℃
Rated Ambient
Temperature
70℃
70℃
Rated Terminal
Part Temp.
125℃
125℃
Resistance
100mΩmax.
50mΩmax.
Current Rating
0.5A
1A
Max. Overload
Current
1A
2A
Operating
Temp. Range
Packaging & Q'ty/Reel pcs）
（
TCM
15,000
－
－
－
－
－
－
－
TPL・TP
－
TPL：20,000
TP ：10,000
TP ：10,000
TP ：10,000
－
－
－
－
TD
－
－
5,000
5,000
5,000
5,000
－
－
TE
－
－
－
4,000
※4
4,000
※4
4,000
※4
4,000
4,000
■Performance
Test Items
Resistance
T.C.R.
Overload
（Short time）
Resistance to soldering heat
RK73H, RK73B
Performance Requirements ΔR±
（％＋0.1Ω）
Limit
Typical
Within specified tolerance
Within specified T.C.R.
2
—
—
1：1F
0.8：others
1：R＜10Ω, R＞1MΩ
0.5：others
0.5：1F
0.3：others
0.75：1J, 2A, 2B
1.5：1F
1：others
0.75：1J, 2A, 2B
1：others
0.5
0.3：1F, 1H
0.2：others
RK73Z
Performance Requirements
Limit
Typical
R≦100mΩ：1H
R≦50mΩ：others
—
R≦100mΩ：1H
R≦50mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
R≦150mΩ：1H
R≦100mΩ：others
R≦150mΩ：1H
R≦100mΩ：others
R≦150mΩ：1H
R≦100mΩ：others
R≦150mΩ：1H
R≦100mΩ：others
R≦90mΩ：1H
R≦40mΩ：others
—
R≦90mΩ：1H
R≦40mΩ：others
R≦90mΩ：1H
R≦40mΩ：others
R≦90mΩ：1H
R≦40mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
R≦100mΩ：1H
R≦50mΩ：others
Test Methods
25℃
＋25℃/－55℃ and ＋25℃/＋125℃
RK73B,RK73H : Rated voltage×2.5 for 5s (1E, 2B, W3A2:Rated voltage×2 for 5s)
Max. overload current, 5s
260℃±5℃, 10s±1s
－55℃
（30min.）
/＋125℃
（30min.）100 cycles
40℃±2℃, 90%½95%RH, 1000h
1.5h ON/0.5h OFF cycle
70℃±2℃ or rated terminal part temperature ±2℃ 1000h
1.5h ON/0.5h OFF cycle
＋125℃, 1000h：1F
＋155℃, 1000h：1H, 1E, 1J, 2A, 2B, 2E, W2H, W3A, W3A2
Soaked in industrial oil with sulfur substance 3.5% contained 105℃ ±3℃ 500h
1：10Ω≦R≦1MΩ
3：R＜10Ω, R＞1MΩ
1：1F
Rapid change of temperature
0.5：others
Moisture resistance
Endurance at 70℃ or rated
terminal part temperature
High temperature exposure
Sulfuration test
2：1J, 2A, 2B
3：others
2：1J, 2A, 2B
3：others
1
5
Please refer to conventional products for characteristic data such as temperature rise.
■Precautions for Use
・
The substrate of chip resistors is alumina. Cracks may occur at the connection of solder (solder fillet portion) due to the difference of the coefficient of thermal
expansion from a mounting board when heat stress like heat cycle, etc. are repeatedly given to them. Care should be taken to the occurrence of the cracks when
the change in ambient temperature or ON/OFF of load is repeated, especially when large types of W2H/W3A/W3A2 which have large thermal expansion and
also self heating. By general temperature cycle test using glass-epoxy(FR-4) boards under the maximum/minimum temperatures of operating temperature range,
the crack does not occur easily in the types of 1F∼2E, but the crack tends to occur in the types of W2H/W3A/W3A2. The occurrence of the crack by heat
stress may be influenced by the size of a pad, solder volume, heat radiation of mounting board etc., so please pay careful attention to designing when a big change
in ambient temperature and conditions for use like ON/OFF of load can be assumed.
・
Care should be taken that RK73B1F and RK73H1F may be damaged when static electricity occurs and is applied in the equipment assembly process.
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.
Aug.
2021
Oct.
2021
www.koaglobal.com
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