Approval sheet
WW20P, WW12P, WW10P, WW08P,
WW06P, WW04P
1%, 5%
Thick Film High Power Current Sensing
Chip Resistors
Size 2010, 1206, 1210, 0805, 0603, 0402
(Automotive Grade Compliant)
*Contents in this sheet are subject to change without prior notice.
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Approval sheet
FEATURE
1.
2.
3.
4.
High power rating and compact size
Automotive AEC Q-200 Compliant
100% CCD Visual inspection
RoHS compliant and Lead free products
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 free tin alloy.
Fig 1. Construction of Chip-R
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Approval sheet
QUICK REFERENCE DATA
Item
Series No.
Size code
Resistance Tolerance
Resistance Range
TCR (ppm/C)
0.010 ~ 0.015R
0.016 ~ 0.021R
0.022 ~ 0.039R
0.040 ~ 0.050R
0.051 ~ 0.464R
0.470 ~ 0.976R
Max. dissipation at
T
amb
=70C
Max. Operation Current
Operation Temperature
0 ~ +1000
0 ~ +800
0 ~ +600
0 ~ +400
0 ~ +200
+/-100
3/4 W
8.66 ~ 0.86A
0 ~ +1000
0 ~ +800
0 ~ +600
0 ~ +500
0 ~ +250
+/-100
2/3W
8.12 ~ 0.81A
0 ~ +400
0 ~ +200
+/-100
1/2 W
3.16 ~ 0.7A
-55/+155’C
0 ~ +200
+/-100
1/3 W
2.56 ~ 0.57A
0 ~ +250
+/-100
1/4W
1.58 ~ 0.5A
0 ~ +300
0 ~ +200
1/8W
1.11 ~ 0.35A
0.010 ~ 0.976
0.010 ~ 0.976
WW20P
2010 (5025 )
WW10P
1210 ( 3225 )
General Specification
WW12P
1206 (3216)
WW08P
0805 (2012)
WW06P
0603 (168)
WW04P
0402 (1005)
5%, 1%
(E24+E96)
0.047 ~ 0.976
0.050 ~
0.976
0.100 ~
0.976
0.100 ~
0.976
MECHANICAL DATA (unit: mm)
Dimension
L
W
T
Tt
Tb
2010
5.00
0.20
2.50
0.20
0.55
0.10
0.65
0.25
0.60
0.25
1210
3.10
0.10
2.60
0.10
0.55
0.10
0.50
0.20
0.50
0.20
1206
3.10
0.10
1.60
0.10
0.60
0.15
0.50
0.20
0.45
0.20
0805
2.00
0.10
1.25
0.10
0.50
0.15
0.40
0.20
0.40
0.20
0603
1.60
0.10
0.80
0.10
0.45
0.15
0.30
0.10
0.30
0.20
0402
1.00
0.05
0.50
0.05
0.35
0. 50
0.20
0.10
0.25
0.10
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Approval sheet
MARKING
For 0805/1206/1210/2010, each resistor is marked with a four-digit code on the protective coating to
designate the nominal resistance value.
Example:
R100 = 0.10
R510 = 0.51
For 0603, each resistor is marked with a three-digit code on the protective coating to designate the
nominal resistance value.
Example:
R10 = 0.10
R51 = 0.51
For 0402, no marking is defined!
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Approval sheet
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.3
Fig 3. Max. 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.
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Switching Power Supply Study Group
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