WIRE WOUND
EU
RoHS
RW
Coat-insulated Miniature Precision Power Wirewound Resistors
■Construction
①
②
L
⑤
④
③
φd
D
① Insulation coating
② Resistive wire
③ Lead wire
④ Electrode cap
⑤ Ceramic core
Coating color：Black
Marking：Alphanumeric
■Dimensions
■Features
・
Resistors meet MIL-R-26E (U and V characteristics) and
surface temp. (hot spot) 350℃ max.
・
Resistors with a wide range of 0.1Ω∼62kΩ, covering
applications from precision to power.
・
RW□N type resistors are non-inductive wound and can be
used in high frequency bands.
・
Products meet EU-RoHS requirements.
Type
RW1/2・RW1/2N
RW1 ・RW1N
RW2 ・RW2N
RW3 ・RW3N
RW5 ・RW5N
RW7 ・RW7N
RW10 ・RW10N
L
8.0±1.0
10.5±1.0
13.0±1.0
16.5±1.0
22.0±1.0
31.5±1.0
46.0±1.5
Dimensions
（mm）
D
d
（Nominal）
1.6
＋1.0
.
－0
0.5
2.7±1.0
5.2±1.0
0.8
6.4±1.0
7.8±1.5
9.3±1.5
1.0
ℓ
Weight
（g）
（1000pcs）
180
270
1,000
1,820
3,240
5,060
8,900
38±3
■Applications
・
Inrush current preventitive resistors.
・
Resistors for various power supplies such as instrumentations,
communications, medical, etc.
・
Resistors for semiconductor burn-in boards.
■Type Designation
Example
RW
Product
Code
1/2
Power
Rating
1/2：0.5W
1
：1W
2：2W
3：3W
5：5W
7：7W
10：10W
Winding
Method
Nil：Standard
winding
N：Non-inductive
winding
T
Terminal
Surface Material
T：Sn
100
Nominal
Resistance
D, F：4 digits
H, J：3 digits
J
Resistance
Tolerance
D：±0.5%
F：±1%
H：±3%
J：±5%
■Reference Standard
MIL-R-26E
Contact us when you have control request for environmental hazardous material other than the substance specified
by EU-RoHS.
■Ratings
Power Rating
Type
RW1/2T
RW1/2NT
RW1T
RW1NT
RW2T
RW2NT
RW3T
RW3NT
RW5T
RW5NT
RW7T
RW7NT
RW10T
RW10NT
Characteristics U
0.5W
1W
2W
3W
5W
7W
10W
Characteristics V
－
－
3W
5W
7W
10W
14W
D：±0.5%
E24・E96
n
n
25×10・
50×10
10½2.61k
－
1½5.11k
－
1½10k
－
1½15k
－
1½30.1k
－
1½45.3k
－
1½60.4k
－
Resistance Range
（Ω）
F：±1%
H：±3%
E24・E96
E24
n
n
n
n
25×10・
50×10
25×10・
50×10
10½2.61k
0.47½2.7k
10½2.37k
10½2.4k
1½5.11k
0.1½5.1k
10½3.74k
10½3.6k
1½10k
0.1½10k
15½10k
10½10k
1½15k
0.1½15k
15½15k
15½15k
1½30.1k
0.1½30k
20½29.4k
20½30k
1½45.3k
0.1½47k
36½44.2k
36½43k
1½60.4k
0.1½62k
62½49.9k
62½51k
J：±5%
E24
n
n
25×10・
50×10
0.47½2.7k
10½2.4k
0.1½5.1k
10½3.6k
0.1½10k
10½10k
0.1½15k
15½15k
0.1½30k
20½30k
0.1½47k
36½43k
0.1½62k
62½51k
T.C.R.
−6
（×10 /K）
Max.
Working
Voltage
80V
130V
＋20/－50：R≧10Ω
＋50/－70：1Ω≦R＜10Ω
＋400/－90：R＜1Ω
140V
200V
400V
600V
1000V
Max.
Overload
Voltage
150V
300V
500V
600V
700V
800V
1500V
High Power Type Resistors
※Resistance tolerance B
（±0.1%）
available. Please refer to us.
Rated Ambient Temperature：＋25℃
Operating Temperature Range：Characteristics U −55℃∼＋275℃，Characteristics V −55℃∼＋350℃
Rated voltage＝
√￣￣￣￣￣￣￣￣￣￣￣￣
or Max. working voltage, whichever is lower.
Power Rating×Resistance value
Characteristics U and V: Each performance is different depending on use conditions, but no difference of the product itself.
176
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
-100 -50
-55
0
50
25
100
150
200
250
300
350
400
Characteristics V
Characteristics U
■Surface Temperature Rise
350
Surface temperature rise
（℃）
300
250
200
150
100
50
0
0
20
40
60
80
100
120
140
160
180 200
RW2
RW7,RW10
RW1/2,RW1,RW3,RW5
275
Ambient temperature
（
℃
）
For resistors operated at an ambient temperature of 25℃ or higher, the power shall be derated
in accordance with the above derating curve.
Power rating ratio（%）
（Characteristics U）
■Frequency Characteristic (Reference)
1000
900
800
RW1
Resistance（Ω）
700
600
500
400
300
200
100
0
1
100Ω
10Ω
100
10
1k
10k
100k
1M
10M
RW1N
RW1
RW1N
500Ω
RW1N
RW1
Frequency（Ｈz）
100M
■Performance
Test Items
Resistance
T.C.R.
Overload Short time）
（
Resistance to soldering heat
Moisture resistance
Endurance at 25℃
High temperature exposure
Performance Requirements
ΔR±
（%＋0.05Ω）
Within specified tolerance
Within specified T.C.R.
0.2：U
2 ：V
0.1
0.2：U
2 ：V
0.5：U
3 ：V
0.2：U
2 ：V
Test Method
25℃
＋25℃/－55℃、＋25℃/＋125℃
Rated power×5 or Max. overload vol., whichever is lower, for 5s
Rated power×10 or Max. overload vol., whichever is lower, for 5s
350℃±10℃, 3s±0.5s or 260℃±5℃, 10s±1s
Power rating×1/10, 40℃, 90%½95%RH, 1000½
1.5h ON/0.5h OFF cycle
25℃, 2000½
1.5h ON/0.5h OFF cycle
＋5
275 ℃, 250h
－0
＋5
350 ℃, 250h
－0
High Power Type Resistors
High Power Type Resistors
■Precautions for Use
・
Be careful to handle these resistors because outer coatings are comparatively weak to outer shock due to flameproof special coats. Please wash them to a
minimum. No external force is given to the coating films until they are well dried because the coating films become weaker right after washing. The original
strength will be returned after they are dried, so please pay attention not to apply any external force onto the coating film of resistors for 20 minutes after
drying. Especially no PC boards shall be piled up.
・
In case of using them for an AC circuit, abnormal phenomena like oscillation etc. occasionally happen as they have an inductance or a parasitic capacitance because of their
wiring structures. Use them by taking the dispersion of constants of other components into the consideration.
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
177
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