THICK FILM
(
ULTRA PRECISION
)
Flat Chip Resistors
Flat Chip Resistors
EU
RoHS
RK73G
Flat Chip Resistors (Ultra Precision Grade)
■Construction
c
L
c
W
⑥
⑤
t
d
②
③
④
①
Protective coating ④
Ni plating
②
Resistive film
⑤
Solder plating
③
Inner electrode
⑥
Ceramic substrate
①
Coating color：Black (1H, 1E), Dark blue (1J, 2A, 2B)
■Features
・
Metal-glaze thick film resistor for surface mounting.
−6
・
High precision resistor with T.C.R. ±50×10 /K and tolerance
±0.25%.
・
Suitable for both flow and reflow solderings.
・
Products with lead free termination meet EU-RoHS requirements.
EU-RoHS regulation is not intended for Pb-glass contained in
electrode, resistor element and glass.
・
AEC-Q200 Tested.
■Dimensions
Type
（Inch Size Code）
1H
（0201）
1E
（0402）
1J 0603）
（
1J AT 0603）
（
2A 0805）
（
2A AT 0805）
（
2B
（1206）
2B AT 1206）
（
L
0.6±0.03
1.0
＋0.1
－0.05
1.6±0.2
2.0±0.2
3.2±0.2
W
0.3±0.03
0.5±0.05
0.8±0.1
1.25±0.1
1.6±0.2
Dimensions（mm）
c
d
0.1±0.05
0.15±0.05
0.2±0.1
0.3±0.1
0.35±0.15
0.4±0.2
0.45±0.25
0.5±0.3
0.55±0.35
0.25
＋0.05
－0.1
0.3±0.1
0.5±0.2
0.3
＋0.2
－0.1
0.6±0.2
0.4
＋0.2
－0.1
0.8±0.2
Weight
（g）
（1000pcs）
t
0.23±0.03
0.14
0.35±0.05
0.45±0.1
0.5±0.1
0.55±0.1
0.6±0.1
0.68
2.14
4.54
9.14
■Applications
・
Car electronics, Industrial equipment, Industrial measurement
・
Replacement of metal film chip resistors.
■Reference Standards
IEC 60115-8
JIS C 5201-8
EIAJ RC-2134C
■Type Designation
Example
RK73G
Product
Code
2A
Power
Rating
1H：0.05W
1E：0.1W
1J ：0.1W
2A：0.125Ｗ
2B：0.25W
T
TD
1002
D
Resistance
Tolerance
C：±0.25%
D：±0.5%
F：±1%
Characteristic
Nil：Standard
NEW
A：Heat shock
resistance
※1
Terminal
Taping
Surface Material
T：Sn
TCM：2mm pitch
（L
：Sn/Pb
※2
） press paper
TPL・TP：2mm pitch
punch paper
TD：4mm pitch
punch paper
TE：4mm pitch
plastic embossed
BK：Bulk
Nominal
Resistance
4 digits
※1 With type A, only T is available as the terminal surface material.
※2 With type 1H, only T is available as the terminal surface material.
The terminal surface material lead free is standard.
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.
■Ratings
Type
1H
1E
1J
2A
2B
Power
Rating
0.05W0
0.1W00
0.1W00
0.125W
0.25W0
70℃
125℃
±50
100½1M
10½1M
10½1M
Rated
Ambient
Temp.
Resistance Range（Ω）
Rated
T.C.R.
Terminal
C:±0.25％
D:±0.5％
F:±1％
−6
（×10 /K）
Part Temp.
E24 E96
・
E24・
E96
E24・
E96
—
100½1M
※3
100½1M
※3
Max. Working
Voltage
25V
50V
75V
150V
200V
Max. Overload
Voltage
50V
100V
150V
200V
400V
Packaging & Q’ /Reel（pcs）
ty
TCM
15,000
—
—
—
—
TPL・
TP
—
TPL：20,000
TP ：10,000
TP ：10,000
—
—
TD
—
—
5,000
5,000
5,000
TE
—
—
—
4,000
※4
4,000
※4
Operating Temperature Range：−55℃∼＋155℃
Rated voltage＝
√￣￣￣￣￣￣￣￣￣￣￣￣
or Max. working voltage, whichever is lower.
Power Rating×Resistance value
For flat chip jumper resistor, please refer to RK73Z series.
※3 The nominal resistance value for RK73G 1H（D：±0.5％、F：±1％）is E24.
※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
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. 2021
Oct. 2021
www.koaglobal.com
www.koaglobal.com
■Derating Curve
Ambient temperature
Percent rated power（％）
Percent rated power（％）
100
80
60
40
20
0
-60 -40 -20
-55
100
80
60
40
20
0
-60 -40 -20
-55
Flat Chip Resistors
Flat Chip Resistors
Terminal part temperature
0
20
40
60 80 100 120 140 160
70
155
0
20
40
60
80 100 120 140 160
125 155
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.
Terminal Part temperature（℃）
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”
“
on the beginning of our catalog before use.
■Temperature Rise
RK73G 1E-1J
60
1E
1E
1J
1J
30
RK73G 2A-2B
70
2B
60
2B
2A
2A
40
Temperature Rise
（℃）
Temperature Rise
（℃）
■外½寸法
50
40
50
■外½寸法
Regarding the temperature rise, the
value of the temperature varies per
conditions and board for use since the
temperature is measured under our
measuring conditions.
Ｃ
W
30
Ｃ
½
Measurement condition
Room temperature: 25℃
PCB: FR-4t = 1.6mm
Cu foil thickness: 35µm
Ｃ
W
① Hot spot
：
Ｃ
½
20
20
10
10
② Terminal
：
0
0
25
50
75
100
Power
Ｌ
Rating（%）
½
0
0
½
25
Power Rating
（%）
50
75
100
Ｌ
½
½
■One-Pulse Limiting Electric Power
RK73G 1H-2B
One-Pulse Limiting Electric Power W）
（
100
10
2B
1
2A
1J
1E
0.1
0.001
0.01
0.1
1
10
100
1000
1H
Pulse Duration
（ms）
The maximum applicable voltage is equal to the max. overload voltage.
Please ask us about the resistance characteristic of continuous applied pulse.
The pulse endurance values are not assured values,so be sure to check the
products on actual equipment when you use them.
■Performance
Test Items
Resistance
T.C.R.
Overload
（Short time）
Resistance to
soldering heat
Rapid change of
temperature
Moisture resistance
Endurance at 70℃ or rated
terminal part temperature
High temperature exposure
Performance Requirements ΔR±
（％＋0.1Ω）
Limit
Within specified tolerance
Within specified T.C.R.
2
1
Typical
—
—
0.6
1：1H
0.4：1E, 1J, 2A, 2B
Test Methods
25℃
＋25℃/＋125℃：1H
＋25℃/－55℃ and ＋25℃ /＋125℃：1E, 1J, 2A, 2B
Rated voltage×2.5 for 5s 1E, 2B：
（
Rated voltage×2 for 5s）
260℃±5℃, 10s±1s
0.5：Characteristic
「Nil」Standard） 0.3：Characteristic
（
「Nil」Standard）
（
Characteristic「Nil」
（Standard）
ー55℃
（30min.）
/＋125℃
（30min.） cycles
100
1：Characteristic
「A」
0.5：Characteristic
「A」
Characteristic「A」
（Heat shock resistance）ー55℃
：
（30min.）
/＋125℃
（30min.）
1000 cycles
（Heat shock resistance）
（Heat shock resistance）
3：1H, 1E
2：1J, 2A, 2B
3：1H, 1E
2：1J, 2A, 2B
1
1：1H, 1E
0.6：1J, 2A, 2B
1：1H, 1E
0.6：1J, 2A, 2B
0.6
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
＋155℃, 1000h
■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. 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.
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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