POE International Corp
SPECIFICATION OF LOW OHMIC CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
1 of 7
ROHS compliance
WW12X, WW08X, WW06X, WW04X
±1%, ±5%
Low ohmic chip resistors
Size 1206, 0805, 0603, 0402
Customer
:
Approval No :
Issue Date
:
Customer Approval :
POE International Corp
SPECIFICATION OF LOW OHMIC CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
2 of 7
FEATURE
1. High power rating and compact size
2. High reliability and stability
3. Reduced size of final equipment
4. Lead free product is upon customer requested.
APPLICATION
•
•
•
•
•
•
•
Power supply
PDA
Digital meter
Computer
Automotives
Battery charger
DC-DC power converter
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 a Lead-tin or Tin (lead free) alloy.
Fig 1. Consctruction of Chip-R
POE International Corp
SPECIFICATION OF LOW OHMIC CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
3 of 7
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
0.01Ω
≤
Rn < 0.02Ω
0.02Ω
≤
Rn < 0.05Ω
0.05Ω
≤
Rn < 0.10Ω
0.10Ω
≤
Rn < 0.50Ω
0.50Ω
≤
Rn < 1Ω
Max. dissipation at T
amb
=70°C
Max. Operation Voltage (DC or RMS)
Climatic category (IEC 60068)
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
0.01Ω~0.976Ω
≤
2100 ppm/°C
≤
2100 ppm/°C
≤
1000 ppm/°C
≤
500 ppm/°C
≤
400 ppm/°C
1/4 W
200V
WW12X
1206 ( 3216 )
General Specification
WW08X
0805 ( 2012 )
WW06X
0603 ( 1608 )
WW04X
0402(1005)
±5%, ±1%
0.02Ω~0.976Ω
N/A
≤
1500
ppm/°C
≤
1000
ppm/°C
≤
500 ppm/°C
≤
300 ppm/°C
1/8 W
100V
55/155/56
1/10 W
50V
1/16 W
0.10Ω ~ 0.976Ω
N/A
N/A
≤
500 ppm/°C
≤
300 ppm/°C
≤
600 ppm/°C
≤
600 ppm/°C
RCWV
=
Rated Power
×
Resistance Value
or Max. RCWV listed above, whichever is lower.
3.
4.
Tolerance of TCR=±200ppm/°C
Lead free product is upon customer requested.
MECHANICAL DATA
Symbol
L
W
T
Tt
Tb
WW12X
3.10
±
0.10
1.60
±
0.10
0.60
±
0.15
0.50
±
0.20
0.45
±
0.20
WW08X
2.00
±
0.10
1.25
±
0.10
0.50
±
0.15
0.40
±
0.20
0.40
±
0.20
WW06X
1.60
±
0.10
0.80
±
0.10
0.45
±
0.15
0.30
±
0.10
0.30
±
0.20
WW04X
1.00
±
0.05
0.50
±
0.05
0.35
±
0.05
0.20
±
0.10
0.25
±
0.10
POE International Corp
SPECIFICATION OF LOW OHMIC CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
4 of 7
MARKING
Each resistor is marked with a four-digit code on the protective coating to designate the nominal resistance
value.
Example:
R010 = 0.01Ω
R510 = 0.51Ω
WW04X series has no marking on the product overcoat for both 5% & 1%.
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E96 & E24 series for resistors with a tolerance of
±5%
&
±1%.
The values of the E24/E96 series are in accordance with
“IEC
publication 60063”.
Derating curve
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.
POE International Corp
SPECIFICATION OF LOW OHMIC CHIP RESISTOR
M01-00-E-07
Ver: 1
Page:
5 of 7
SOLDERING CONDITION
The robust construction of chip resistors allows
them to be completely immersed in a solder bath
of 260°C for one minute. 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 230°C during 2 seconds. The test
condition for no leaching is 260°C for 60
seconds. Typical examples of soldering
processes that provide reliable joints without any
damage are given in Fig 3.
Fig 3. Infrared soldering profile
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WW12
Size code
WW12 : 1206
WW08 : 0805
WW06 : 0603
WW04 : 0402
X
Type code
X : Normal
R020
Resistance code
E96 +E24:
R is first digit followed by 3
significant digits.
0.020Ω = R020
0.510Ω = R510
0.025Ω = R025
J
Tolerance
J :
±5%
G :
±2%
F :
±1%
T
Packaging code
T : 7” Reel taping
_
Termination code
_ = SnPb base (“_”
means a blank)
L
=
Sn base (lead
free)
Tape packaging WW12,WW08,WW06 : 8mm width paper taping 5,000pcs per reel.
WW04:
8mm width paper taping 10,000pcs per reel.
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