Type CD Low Resistance Precision Chip Resistors
Page 2 of 2
Style WB - Wire Bond Version is a hybrid mountable version with copper pedestal terminals and an aluminum surface layer for wire
bonding. The back surface of these devices is metallized for solder attachment of the chip resistor to a heat sinking substrate.
Power Capability Information
Resistance
Dimensions in inches and (millimeters)
Thermal Resistance
Comments
R
Max. Chip
Temperature
θJC
Model
Film (J) to Solder Pad (C)
(see note 3)
Min.
Max.
A
B
C
D
.200 ±.012
(5.08 ±.30)
.250 ±.012
(6.35 ±.30)
.150 ±.012
(3.81 ±.30)
.200 ±.012
(5.08 ±.30)
.061 ±.005
(1.55 ±.13)
.061 ±.005
(1.55 ±.13)
.062 min.
(1.57 min.)
Terminals have an Aluminum surface layer for
wire bonding. Aluminum wire to be used for bonding.
8.33°C/Watt
5.00°C/Watt
150°C
150°C
CD2015WBA
CD2520WBA
0.010 Ω
0.010 Ω
0.20 Ω
0.20 Ω
Terminals have an Aluminum surface layer for
wire bonding. Aluminum wire to be used for bonding.
.078 min.
(1.98 min.)
Note 3: Thermal Resistance - In High Power Applications where the circuit board material
provides high heat sinking benefits (such as IMS, Alumina, or other) the thermal resistance of
the chip resistor is useful to establish the maximum power capability of the chip resistor in the
application. The film temperature is measured at the center of the resistor element and the
solder pad temperature is measured at the soldered interface with the circuit board. Maximum
temperature of the chip resistor (at the center of chip) should not exceed 150°C through the
temperature range of the application.
CD2015WBA
Standard Resistance Values:
Tolerance CD2015WBA ±1% Standard.
0.010 Ω
0.015 Ω
0.020 Ω
0.025 Ω
0.030 Ω
0.033 Ω
0.040 Ω
0.050 Ω
0.075 Ω
0.10 Ω
0.20 Ω
CD2520WBA
Standard Resistance Values:
Tolerance CD2520WBA ±1% Standard.
Location for Sense (Potential) Connection:
Film Temperature
Measuring Point
Note: The sense connection for each
Sense Wire
Current Wire
Sense Wire
Current Wire
pedestal is positioned inboard of the current
connection (single or multiple current wires).
0.010 Ω
0.015 Ω
0.020 Ω
0.025 Ω
0.030 Ω
0.033 Ω
0.040 Ω
0.050 Ω
0.075 Ω
0.10 Ω
0.20 Ω
Solder pad, soldered
interface with circuit board.
Circuit board: IMS, Ceramic (Alumina) , or other.
WB Resistor mounting
Custom resistance values and non-standard tolerances
can be manufactured for high quantity applications.
Please contact Caddock Applications Engineering.
General Information for Type CD - Style FC and Style WB - Chip Resistors.
Specifications:
Packaging information:
Solder attachment notes:
Temperature Coefficient: TC referenced to
+25°C, ∆R taken at +150°C.
0.050 ohm to 0.20 ohm, 0 to +100 ppm/°C
0.010 ohm to 0.049 ohm, 0 to +200 ppm/°C
Style FC, flip chip resistors, are shipped with the bare
ceramic side up in the pocket, with the solderable pedestals
facing down.
Style WB, wire bondable resistors, are shipped with the
wire bondable pedestals facing up in the pocket.
During soldering of the Type CD Resistor
the soldering temperature profile must not
cause the pedestal terminals of this device
to exceed 220°C.
Style FC - Flip Chip version resistors
have a bare ceramic back surface. The
recommended solder for flip chip solder
attachment is 62Sn / 36Pb / 2Ag.
Inductance: Less than 5 nH typical
The illustration shows the orientation of the CD2015 chip
resistors in the tape. The CD2520 resistors chips are ro-
tated 90° from what is shown in the illustration.
Load Life: 1000 hours at rated power, based
upon 150°C max. chip temperature,
∆R ± (0.5% + 0.0005 ohm)
7” dia.
(178 mm)
12mm
0.473”
Bo
Momentary Overload: 1.5 times rated
power, for 5 seconds, ∆R ± (0.5% + 0.0005
ohm)
Style WB - Wire Bond version resistors
have a metallized back surface for
soldering to a substrate or a heat sink.
The recommended solders is
Ao
Ko signifies tape thickness and dimension
Operating Temperature: -55°C to +150°C
62Sn / 36Pb / 2Ag.
.512” arbor hole
(13mm)
Measurement Note: All measurements
are taken using Kelvin connections per the
recommended connection locations.
Size 2015
Size 2520
Ao 0.189” (4.80mm) 0.271” (6.88mm)
Bo 0.209” (5.31mm) 0.216” (5.49mm)
Ko 0.087” (2.21mm) 0.066” (1.68mm)
A
Ordering
Information:
Physical Size
2015 = 0.200” x 0.150”
2520 = 0.250” x 0.200”
D
Carrier Tape and pocket dimensions:
Tape is 12mm Carrier Tape (8mm pitch)
B
CD 2520 FC - 0.10 - 1%
Full reel quantities:
1000 pieces per reel for CD2015 and CD2520
Tolerance:
Quantities of less than 250 will be shipped in tape without reel
and without tape leader at the option of Caddock.
Type CD
Style:
±1% 0.010 Ω and above.
C
FC or WBA
Tape dimensions and materials will be consistent with EIA-481-1.
Reels will be marked with a label containing Caddock logo, part
number, resistor value, tolerance, packaging date, and quantity.
Dimensions in inches and (millimeters)
Resistor Value (Ω)
See charts for availability
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (951) 369-1151
Hurst Green • Surrey • RH8 9AX • UK
Email • sales@rhopointcomponents.com
Web • www.rhopointcomponents.com
UK & Ireland
Distributors
Tel: +44 (0) 870 608 1188
© 2004 Caddock Electronics, Inc.
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