DATA SHEET
Product Name Wide Terminal Thick Film Chip Resistors
Part Name WR Series
Uniroyal Electronics Global Co., Ltd.
88 Longteng Road, Economic & Technical Development Zone, Kunshan, Jiangsu, China
Tel
Email
Manufacture Plant
+86 512 5763 1411 / 22 /33
marketing@uni-royal.cn
Uniroyal Electronics Industry (kunshan) co., ltd.
Uniroyal Electronics Industry Co., Ltd.
Uniroyal Electronics Global Co.,Ltd Shenzhen Branch
Aeon Technology Corporation
Uniroyal Electronics Global Co.,Ltd Xiamen Branch
Kunshan Foss Electronic material Co., Ltd.
Royal Electronic Factory (thailand) co., ltd
Brands
RoyalOhm
UniOhm
Wide Terminal Thick Film Chip Resistors - Data Sheet
1. Scope
1.1 This specification for approve relates to the Wide Terminal Thick Film Chip Resistors manufactured by UNI-ROYAL.
1.2 Suitable for both wave & re-flow soldering
1.3 Application：AV adapters，LCD back-light，camera strobe etc
2. Explanation of Part No. System
Part No. includes 14 codes shown as below:
2.1 1st~4th codes: Part name. E.g.: WR08, WR12, WR20, WR18, WR25
2.2 5th~6th codes: Power rating.
E.g.: W=Normal Size
“1~G” = “1~16”
Wattage
Normal Size
1/32
WH
3/4
07
1/2
W2
1/3
W3
1/4
W4
1/8
W8
1/10
WA
1/16
WG
1/20
WM
1
1W
If power rating is lower or equal than 1 watt, 5
th
code would be “W” and 6
th
code would be a number or letter.
E.g.: WA=1/10W
W4=1/4W
th
2.3 7 code: Tolerance. E.g.: D=±0.5%
F=±1%
G=±2%
J=±5%
K= ±10%
th
th
2.4 8 ~11 codes: Resistance Value.
2.4.1 If value belongs to standard value of
≥5%
series, 8
th
code would be zero,9
th
~10
th
codes are significant figures of the resistance and 11
th
code is the power of ten.
2.4.2 If value belongs to standard value of
≤2%
series, 8
th
~10
th
codes are significant figures of the resistance, and 11
th
code is the power of ten.
2.4.3 11
th
codes listed as following:
0=10
0
1=10
1
2=10
2
3=10
3
4=10
4
5=10
5
6=10
6
J=10
-1
K=10
-2
L=10
-3
M=10
-4
N=10
-5
P=10
-6
2.5 12
th
~14
th
codes.
2.5.1 12
th
code: Packaging Type. E.g.: C=Bulk
T=Tape/Reel
th
2.5.2 13 code: Standard Packing Quantity.
4=4000pcs
5=5000pcs
C=10000pcs
D=20000pcs
E=15000pcs
Chip Product: BD=B/B-20000pcs
TC=T/R-10000pcs
th
2.5.3 14 code: Special features.
E = Environmental Protection, Lead Free, or Standard type.
3. Ordering Procedure
(Example: WR18 1W ±5% 10KΩ T/R-4000)
W
R 1
8
1
W
J
0
1
0
3
T
4
E
Product Type:
Product Type:
Fill-in 4 digits with
the chip resistor
type as follows:
WR08、WR12、
WR20、WR18、
WR25
Wattage:
Normal size:
W3=1/3W
W2=1/2W
1W=1W
WK=2/3W
2W=2W
3W=3W
Resistance Value:
5%(E-24 series):
The 1st digit will be “0”; the 2nd
& 3rd digits are for the
significant figures of the
resistance and the 4th digit
indicate the numbers of zeros
following.
1%(E-96 series ):
The 1st to 3rd digits are for the
significant figures OF the
resistance and 4th digit denotes
number of zeros following.
J=10
-1
; K=10
-2
; L=10
-3
M=10
-4
；N=10
-5
Tolerance:
F=±1%
J=±5%
Packing quantity:
4=4000PCS
5=5000PCS
C=10,000pcs
D=20,000pcs
E=15,000pcs
Special Feature
E= Lead-Free
Packing Type:
T=Tape/Reel
B=Bulk in poly bag
C=Bulk in cassette
Feb.13,2019 V.3
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Wide Terminal Thick Film Chip Resistors - Data Sheet
4. Marking
(1)
5%Tolerance:
The first two digits are
significant figures of resistance and the
third denotes number of zeros following
Example:
.
(2)
5%Tolerance:
Below 10 show as
following, read alphabet ”R” as decimal point.
Example:
2R2 2.2
(3)
1%
Tolerance: 4 digits, first three digits are
significant; the forth digit is number of zeros.
Letter r is decimal point.
Example:
(4)
5%,±1%
Tolerance ,Product below 1Ω,show
as following, the first digit is“R＂which as decimal point.
Example:
333
33K
2701
2.7K
R500
0.5
5. Dimension
Type
L
WR08(0508)
WR12(0612)
WR20(1020)
WR18(1218)
WR25(1225)
1.20±0.10
1.60±0.15
2.50±0.15
3.10±0.10
3.10±0.15
W
2.0±0.10
3.20±0.15
5.00±0.15
4.60±0.15
6.25±0.15
Dimension(mm)
H
0.55±0.10
0.55±0.10
0.55±0.10
0.55±0.10
0.55±0.10
A
0.20±0.10
0.30±0.20
0.40±0.20
0.45±0.20
0.45±0.20
B
0.30±0.20
0.45±0.20
0.60±0.20
0.40±0.20
0.65±0.20
6. Resistance Range
Resistance Range
±1%
10Ω~1M
10mΩ≤R＜10Ω
10Ω~1M
10mΩ≤R≤10Ω
10Ω~1M
10mΩ~1Ω
10mΩ~1MΩ
1Ω＜R≤1M
10mΩ≤R≤1Ω
1Ω~1M
1Ω＜R≤1M
±5%
Type
Power Rating at 70℃
1/3W
2/3W
1/2W
1W
1W
1W
2W
3W
WR08
WR12
WR20
WR18
WR25
Feb.13,2019 V.3
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Wide Terminal Thick Film Chip Resistors - Data Sheet
7. Ratings
Max.
Overload
Current
of Jumper
8A
10A
12A
10A
15A
Type
Max
Working
Voltage
150V
200V
200V
200V
200V
Max
Overload
Voltage
300V
400V
400V
400V
400V
Dielectric
Withstanding
Voltage
500V
500V
500V
500V
500V
Resistance
Value of
Jumper
＜50mΩ
＜50mΩ
＜50mΩ
＜50mΩ
＜50mΩ
Rated
Current
of Jumper
4A
5A
6A
6A
6A
Operating
Temperature
-55℃~155℃
-55℃~155℃
-55℃~155℃
-55℃~155℃
-55℃~155℃
WR08
WR12
WR20
WR18
WR25
8.
Recommend the size of welding plate
Type
WR08
WR12
WR20
WR18
WR25
A
0.5±0.1
0.6±0.1
1.1±0.1
2.2±0.1
1.4±0.1
Dimension(mm)
B
C
1.0±0.1
2.0±0.1
1.0±0.1
3.2±0.1
1.2±0.1
5.0±0.1
1.2±0.1
4.6±0.1
1.3±0.1
6.4±0.1
D
2.7±0.1
2.9±0.1
3.5±0.1
4.6±0.1
4.0±0.1
9.
Derating Curve
Resistors shall have a power rating based on continuous load operation at an ambient temperature from -55℃ to 70℃. For temperature in excess
of 70℃, the load shall be derated as shown in figure 1
Figure 1
Voltage rating:
Resistors shall have a rated direct-current (DC) continuous working
Voltage or an approximate sine-wave root-mean-square (RMS) alternating-current (AC) continuous working voltage at commercial-line
frequency and waveform corresponding to the power rating, as determined from the following formula:
RCWV =
P
R
Where: RCWV commercial-line frequency and waveform (Volt.)
P = power rating (WATT.) R = nominal resistance (OHM)
In no case shall the rated DC or RMS AC continuous working voltage be greater than the applicable maximum value.
The overload voltage is 2.5 times RCWV or Max. Overload voltage whichever is less
Feb.13,2019 V.3
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Wide Terminal Thick Film Chip Resistors - Data Sheet
10 . Structure
11. Performance Specification
Test Methods
(GB/T5729&JIS-C-5201&IEC60115-1)
Characteristic
WR08：
Limits
10mΩ≦R<30mΩ:0~+400 PPM/℃
30mΩ≦R＜10Ω:0~+150 PPM/℃
10Ω：±400 PPM/℃
10Ω<R≦100Ω:±200 PPM/℃
>100Ω:±100 PPM/℃
WR12：
10mΩ≦R<100mΩ:0~+200 PPM/℃
100mΩ≦R≦10Ω:0~+150 PPM/℃
1Ω＜R≦10Ω:±400 PPM/℃
10Ω<R≦100Ω±200 PPM/℃
>100Ω:±100 PPM/℃
WR20：
10mΩ≤R＜30mΩ :0~+200 PPM/℃
Temperature
Coefficient
30mΩ≤R≤1Ω :0~+100 PPM/℃
1Ω＜R≦10Ω:±400 PPM/℃
10Ω<R≦100Ω:±200 PPM/℃
>100Ω:±100 PPM/℃
WR18：
10mΩ≤R＜30mΩ:0~+200 PPM/℃
30mΩ≤R≤1Ω:0~+100 PPM/℃
1Ω＜R≦10Ω:±400 PPM/℃
10Ω<R≦100Ω±200 PPM/℃
>100Ω:±100 PPM/℃
WR25：
10mΩ≤R＜30mΩ:0~+150 PPM/℃
30mΩ≤R≤1Ω:0~+100 PPM/℃
1Ω＜R≦10Ω:±400 PPM/℃
10Ω<R≦100Ω±200 PPM/℃
>100Ω:±100 PPM/℃
Short-time overload
Soldering
heat
1%
5%
±(1.0%+0.005Ω)
±(2.0%+0.005Ω)
4.13 Permanent resistance change after the application of 2.5
times RCWV for 5 seconds.
4.18 Dip the resistor into a solder bath having a temperature of
260℃5℃ and hold it for 10±1 seconds.
4.8 Natural resistance changes per temp. Degree centigrade
R
2
-R
1
× 10
6
(PPM/℃)
R
1
(t
2
-t
1
)
R
1
: Resistance Value at room temperature
（t
1
）;
R
2
: Resistance at test temperature
(Upper limit temperature or Lower limit temperature
)
t
1:
+25°C or specified room temperature
t
2:
Upper limit temperature or Lower limit temperature test
temperature
±(1.0%+0.005Ω)
Feb.13,2019 V.3
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