Approval sheet
Page 1 of 8 ASC_WR10X(W)_V13 Oct.- 2011
WR10X(W)
±
±±
±1%, ±
±±
±5%
Thick film Technology
General purpose chip resistors
Size 1210
Approval sheet
Page 2 of 8 ASC_WR10X(W)_V13 Oct.- 2011
FEATURE
1. High reliability and stability
2. Reduced size of final equipment
3. Lower assembly costs
4. Higher component and equipment reliability
5. RoHS 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. Construction of Chip-R
Approval sheet
Page 3 of 8 ASC_WR10X(W)_V13 Oct.- 2011
QUICK REFERENCE DATA
Item General Specification
Series No. WR10X(W)
Size code 1210 ( 3225 )
Resistance Tolerance ±1% ( E96/E24 ), ±5% ( E24 )
Resistance Range Jumper, 1Ω ~ 10MΩ ( E96+E24 series)
TCR (ppm/°C)
-55°C ~ +155°C
> 10R , ≤ ± 100 ppm/°C
1R ~ 10R, ≤ ± 200 ppm/°C
Max. dissipation at T
amb
=70°C 1/3 W ( 0.33 W )
Max. Operation Voltage (DC or RMS) 200V
Max. Overload Voltage (DC or RMS) 400V
Climatic category 55/155/56
Type
WR10X
Power Rating At 70C
1/3 W
Resistance
Max. 50mR
Rated Current
2.5 A
Peak Current
6 A
Operating Temperature
-55C ~ 155C
Note :
1. This is the maximum voltage that may be continuously supplied to the resistor element, see “IEC publication
60115-8”
2. Max. Operation Voltage : So called RCWV (Rated Continuous Working Voltage) is determined by
ValueResistancePower RatedRCWV ×=
or Max. RCWV listed above, whichever is lower.
DIMENSIONS(unit : mm)
Part No
WR10X
L
3.10 ±
±±
± 0.10
W
2.60 ±
±±
± 0.10
Tt
0.50 ±
±±
± 0.20
Tb
0.50 ±
±±
± 0.20 *1
T
0.55 ±
±±
± 0.10
*1 original 0.45+/-0.20
Approval sheet
Page 4 of 8 ASC_WR10X(W)_V13 Oct.- 2011
MARKING
3-digits marking（±5%）
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance
value.
4-digits marking（
±1%
）
Each resistor is marked with a four digits code on the protective coating to designate the nominal resistance value.
Example
RESISTANCE 90Ω 100Ω 6800Ω 47000Ω
4-digits marking 90R0 1000 6801 4702
3-digits marking - 101 682 473
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.
Approval sheet
Page 5 of 8 ASC_WR10X(W)_V13 Oct.- 2011
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 X 4702 F T L
Size code
WR10: 1210
Type code
X :
5%: 1R ~ 10M
1%: 10R ~ 1M
W:
1%: < 10R; > 1M0
Resistance code
5%, E24: 2 significant digits
followed by no. of zeros
100Ω = 101_
10KΩ = 103
1% E24+E96: 3 significant
digits followed by no. of
zeros
102Ω =1020
37.4KΩ =3742
220Ω =2200
Tolerance
J: ±
±±
± 5%
F: ±
±±
± 1%
P: Jumper
Packaging code
T: 7” Reeled taping
Termination code
L = Sn base (lead
free)
Reeled tape packaging : 8mm width paper taping 5000pcs per 7” reel.
Approval sheet
Page 6 of 8 ASC_WR10X(W)_V13 Oct.- 2011
TEST AND REQUIREMENTS(JIS C 5201-1 : 1998)
The tests are carried out in accordance with IEC publication 68, "Recommended basic climatic and mechanical
robustness testing procedure for electronic components" and under standard atmospheric conditions according
to IEC 68-1, subclause 5.3, unless otherwise specified.
Temperature: 15ºC to 35ºC.
Relative humidity: 45% to 75%.
Air pressure: 86kPa to 106 kPa (860 mbar to 1060 mbar).
REQUIREMENT
TEST PROCEDURE / TEST METHOD Resistor 0Ω
ΩΩ
Ω
DC resistance
Clause 4.5
DC resistance values measured at the test voltages specified below :
<10Ω@0.1V, <100Ω@0.3V, <1KΩ@1.0V,
<10KΩ@3V, <100KΩ@10V, <1MΩ@25V, <10MΩ@30V
Within the specified
tolerance <50mΩ
Temperature
Coefficient of
Resistance(T.C.R)
Clause 4.8
Natural resistance change per change in degree centigrade.
( )
6
121
12 10×
−
−
ttR RR
(ppm/°C) t
1
: 20°C+5°C-1°C
R
1
: Resistance at reference temperature
R
2
: Resistance at test temperature
Refer to
“QUICK REFERENCE
DATA” N/a
Short time overload
(S.T.O.L)
Clause 4.13
Permanent resistance change after a 5second application of a
voltage 2.5 times RCWV or the maximum overload voltage specified
in the above list, whichever is less. ∆R/R max. ±(2%+0.10Ω) <50mΩ
Resistance to soldering
heat(R.S.H)
Clause 4.18
Un-mounted chips completely immersed for 10±1second in a SAC
solder bath at 260℃±5ºC ΔR/R max. ±(1%+0.05Ω)
no visible damage <50mΩ
Solderability
Clause 4.17
Un-mounted chips completely immersed for 2±0.5 second in a SAC
solder bath at 235℃±5℃ 95% coverage min., good tinning and
no visible damage
Temperature cycling
Clause 4.19
30 minutes at -55°C±3°C, 2~3 minutes at 20°C+5°C-1°C, 30
minutes at +155°C±3°C, 2~3 minutes at 20°C+5°C-1°C, total 5
continuous cycles
∆R/R max. ±(1%+0.05Ω) < 50mΩ
Damp Heat
(Load life in humidity)
Clause 4.24
1000 +48/-0 hours, loaded with RCWV or Vmax in humidity chamber
controller at 40°C±2°C and 90~95% relative humidity, 1.5hours on
and 0.5 hours off
10Ω≤R<1MΩ :
∆R/R max. ±(3%+0.10Ω)
R<10Ω, R≥1MΩ :
∆R/R max. ±(5%+0.10Ω)
< 50mΩ
Load Life (Endurance)
Clause 4.25
1000+48/-0 hours; loaded with RCWV or V
max
in chamber controller
70±2ºC, 1.5 hours on and 0.5 hours off Ditto.
Bending strength
Clause 4.33
Resistors mounted on a 90mm glass epoxy resin PCB(FR4),
bending once 3mm for 10sec.
No visual damaged,
∆R/R max. ±(1%+0.05Ω) < 50mΩ
Adhesion
Clause 4.32
Pressurizing force: 5N, Test time: 10±1sec. No remarkable damage or removal of
the terminations
Approval sheet
Page 7 of 8 ASC_WR10X(W)_V13 Oct.- 2011
REQUIREMENT
TEST PROCEDURE / TEST METHOD Resistor 0Ω
ΩΩ
Ω
Insulation Resistance
Clause 4.6
Apply the maximum overload voltage (DC) for 1minutes
R≧10GΩ
Dielectric Withstand
Voltage
Clause 4.7
Apply the maximum overload voltage (AC) for 1 minutes
No breakdown or flashover
Approval sheet
Page 8 of 8 ASC_WR10X(W)_V13 Oct.- 2011
PACKAGING
Paper Tape specifications (unit :mm)
Component Size / Series W F E P0 ΦD
WR10X 8.00±0.30 3.50±0.20 1.75±0.10 4.00±0.10
1.0 0.0
50.1
+
−
Φ
Component Size / Series A B P1 T
WR10X 3.60±0.20 3.00±0.20 4.00±0.10 Max. 1.0
Reel dimensions
Symbol A B C D
(unit : mm) Φ178.0±2.0 Φ60.0±1.0 13.0±0.2 9.0±0.5
Taping quantity
- Chip resistors 5,000 pcs/reel
