WR10X(W)
±
1%,
±
5%
General purpose chip resistors
Size 1210
Customer
Approval No
Issue Date
:
:
:
Customer Approval :
Page 1 of 8
WR10X(W)
Ver.11
Jul.-2010
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. LoHS compliant and Lead free products
APPLICATION
•
•
•
Consumer electrical equipment
Automotive application
EDP, Computer application
Telecom application
•
DESCRIPTION
The resistors are constructed in a high grade ceramic body (aluminum oxide). Internal metal electrodes are
added at each end and connected by a resistive paste that is applied to the top surface of the substrate. The
composition of the paste is adjusted to give the approximate resistance required and the value is trimmed to
nominated value within tolerance which controlled by laser trimming of this resistive layer.
The resistive layer is covered with a protective coat. Finally, the two external end terminations are added. For
ease of soldering the outer layer of these end terminations is Tin (lead free) alloy.
Fig 1. Consctruction of Chip-R
Page 2 of 8
WR10X(W)
Ver.11
Jul.-2010
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
-55°C ~ +155°C
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Max. Overload Voltage (DC or RMS)
Climatic category
General Specification
WR10X(W)
1210 ( 3225 )
±1%
( E96/E24 ),
±5%
( E24 )
Jumper, 1Ω ~ 10MΩ ( E96+E24 series)
10R ~ 1M0,
≤ ±
100 ppm/°C
< 10R; > 1M0,
≤ ±
200 ppm/°C
1/3 W ( 0.33 W )
200V
400V
55/155/56
Type
Power Rating At 70C
Resistance
Rated Current
Peak Current
Operating Temperature
WR10X(W)
1/3 W
Max. 50mR
2.5 A
6A
-55C ~ 155C
Note :
1.
2.
This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
Dimensions:
Part No
L
W
Tt
Tb
T
*1 original 0.45+/-0.20
WR10X(W)
3.10
±
0.10
2.60
±
0.10
0.50
±
0.20
0.50
±
0.20 *1
0.55
±
0.10
Page 3 of 8
WR10X(W)
Ver.11
Jul.-2010
Marking
3-digits marking（±5%）
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance
value. For values up to 9.1 the R is used as a decimal point. For values of 10.0 or greater the first 2 digits
apply to the resistance value and third indicate the number of zeros to follow.
4-digits marking（
±1%
）
Each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value.
For values of <97.6Ω the R is used as a decimal point. For values of 100Ω or greater the first 3 digits are significant,
the fourth indicates the number of zeros to follow.
Example
RESISTANCE
4-digits marking
3-digits marking
90Ω
90R0
-
100Ω
1000
101
6800Ω
6801
682
47000Ω
4702
473
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±1%, ±5%.
The values of the E24/E96 series are in accordance with “IEC publication 60063”.
Derating
The power that the resistor can dissipate depends on the operating temperature; see Fig.2
Figure 2
Maximum dissipation in percentage of rated power
as a function of the ambient temperature
MOUNTING
Due to their rectangular shapes and small tolerances, Surface Mountable Resistors are suitable for handling by
automatic placement systems.
Chip placement can be on ceramic substrates and printed-circuit boards (PCBs).
Electrical connection to the circuit is by individual soldering condition.
The end terminations guarantee a reliable contact.
Page 4 of 8
WR10X(W)
Ver.11
Jul.-2010
SOLDERING CONDITION
The robust construction of chip resistors allows them to
be completely immersed in a solder bath of 260°C for 10
seconds. Therefore, it is possible to mount Surface
Mount Resistors on one side of a PCB and other
discrete components on the reverse (mixed PCBs).
Surface Mount Resistors are tested for solderability at
235°C during 2 seconds. The test condition for no
leaching is 260°C for 30 seconds. Typical examples of
soldering processes that provide reliable joints without
any damage are given in Fig 3.
Fig 3. Infrared soldering profile for Chip Resistors
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WR10
Size code
WR10: 1210
X
Type code
X
: Thick
film, 10R
~ 1M
W:
< 10R, 1% ;
> 1M0, 1%
4702
Resistance code
±5%
E24 : 2 significant digits
followed by no. of zeros and
a blank
4.7Ω
10Ω
220Ω
Jumper
=4R7_
=100_
=221_
=000_
J
Tolerance
J:
±
5%
F:
±
1%
P: Jumper
T
Packaging code
T: 7” Reeled taping
L
Termination code
L =
Sn base (lead
free)
(“_” means a blank)
±1%,
E24+E96: 3 significant
digits followed by no. of
zeros
102Ω
37.4KΩ
=1020
=3742
Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel.
Page 5 of 8
WR10X(W)
Ver.11
Jul.-2010
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