Walsin Technology Corporation
WA04X
±1%,
Convex Type
General purpose chip resistors array
Size 0402x4
Customer
:
Approval No :
Issue Date
:
Customer Approval :
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WA04X_1%
Version 6
Mar.-2007
Walsin Technology Corporation
FEATURE
1. Small size and light weight
2. Reduced size of final equipment
3. Lower surface mounted assembly costs
4. Higher component and equipment reliability
5. Lead (Pb) free product is available
APPLICATION
•
•
•
Consumer electrical equipment, PDA, Digital Camcoder, …
EDP, Computer application
Mobile phone, Telecom
DESCRIPTION
The resistors array is 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
within tolerance by laser cutting 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) solder alloy.
Fig 1. Consctruction of a Chip-R array WA04X
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WA04X_1%
Version 6
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Walsin Technology Corporation
QUICK REFERENCE DATA
Item
Series No.
Size
Resistance Tolerance
Resistance Range
TCR (ppm/°C)
10Ω≤R<1MΩ
R<10Ω, R>1MΩ
Max. dissipation at
T
amb
=70°C
Max. Operation
Voltage (DC or RMS)
Max. overload voltage
Climatic category
General Specification
WA04X(Convex)
0402x4 (1005x4)
±1%
10Ω ~ 1MΩ
≤ ±
300
-
1/16 W
25V
50V
55/155/56
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
WA04X
L
W
T
P
A
B
C
G
2.00
±
0.10
1.00
±
0.10
0.45
±
0.10
0.50
±
0.05
0.40
±
0.10
0.20
±
0.10
0.30
±
0.05
0.25
±
0.10
CONSTRUCTION
R1=R2=R3=R4
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WA04X_1%
Version 6
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Walsin Technology Corporation
MARKING
E24 series resistance : 3-digits marking
Each resistor is marked with a three digits code on the protective coating to designate the nominal resistance
value.
For values up to 910Ω the R is used as a decimal point. For values of 1KΩ or greater the first 3 digits
apply to the resistance value and fourth indicate the number of zeros to follow.
Example
RESISTANCE
3-digits marking
10Ω
100
12Ω
12R
100Ω
101
6800Ω
682
47000Ω
473
E96 series resistance : No marking
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the E24+E96 series for resistors with a tolerance of
±1%,
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
Fig 2. Maximum dissipation in percentage of rated power
As a function of the ambient temperature
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Walsin Technology Corporation
CATALOGUE NUMBERS
The resistors have a catalogue number starting with .
WA04
Size code
WA04 : 0402 per
element
X
Type code
X
: x4, convex
472_
Resistance code
E24 : 2 significant digits followed
by no. of zeros and a blank
10Ω
220Ω
Jumper
=100_
=221_
=000_
J
Tolerance
J :
±5%
F :
±1%
T
Packaging code
T : 7” Reel taping
B : Bulk
_
Termination code
_ = SnPb base (“_”
means a blank)
L
=
Sn base (lead
free)
(“_” means a blank)
E96 : 3 significant digits followed
by no. of zeros
102Ω
37.4KΩ
=1020
=3742
1.
Reeled tape packaging : 8mm width paper taping 10,000pcs per reel.
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.
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 235°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 for Chip Resistors array
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WA04X_1%
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Mar.-2007
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