Type CD Low Resistance Precision Chip Resistors
Page 1 of 2
Low Resistance Chip down to 0.010
Ω
at 1% with unique Pedestal Terminal Design
±
for Current Sense in Hybrid and SMT Applications
Type CD Low Resistance Precision Chip Resistors utilize the proven
Caddock Micronox® resistance films to achieve the unique low resistance
range in this family. The special performance features of the Type CD
Low Resistance Precision Film Resistor include:
•
Style FC - Flip Chip version for surface mount applications.
Style WB - Wire Bond version for hybrid applications with metallized
back surface for solder down heat sinking of the chip, includes
bondable terminatipedestals to receive aluminum wire bonds
•
•
Resistance as low as 0.010 ohm at ±1%.
Pedestal terminals in this design provide an ultra low resistance
connection pad which maintains the precision 0.010Ω ±1% at the
point of customer Kelvin connection to the resistor chip. The pedestal
terminal with its copper core also provides heat spreading which
enhances the high power handling capability.
•
Thermal resistance is provided to optimize high power designs when
utilizing higher thermal conductivity circuit board substrates such as IMS or Alumina.
•
•
High pulse handling and overload capability.
Low inductance provides excellent high frequency and pulse response.
Style FC - Flip Chip Version is a surface mount version with solderable pedestal terminals for flip chip soldering.
Power Capability Information
Resistance
Dimensions in inches and (millimeters)
General Applications High Power Applications
Comments
Thermal Resistance -
Film (J) to Solder Pad (C)
R
Max. Chip
Temperature
Power Rating
θJC
Model
at 70° C
Min.
Max.
0.20 Ω
0.20 Ω
A
B
C
D
(see note 1)
(see note 2)
.200 ±.012
(5.08 ±.30
.150 ±.012
(3.81 ±.30)
.063 ±.006
(1.60 ±.15)
.062 min.
(1.57 min.)
.078 min.
(1.98 min.)
CD2015FC
CD2520FC
0.010 Ω
0.010 Ω
1.0 Watt
12.0°C/Watt
9.0°C/Watt
150°C
150°C
Solderable Pedestal
Solderable Pedestal
.250 ±.012
.200 ±.012
.063 ±.006
1.5 Watts
(6.35 ±.30)
(5.08 ±.30)
(1.60 ±.15
Style FC Derating Curve For General Application
100
Note 1: General Applications - The power rating for
general applications is based upon 0.5 sq. in. (300
mm2) of termination pad or trace area (2 oz. copper)
connected to each end of the resistor. Maximum chip
temperature is 150°C. Use Derating Curve to derate
appropriately for the maximum ambient temperature
and for the temperature limitations of the adjacent
materials.
CD2015FC Standard Resistance Values:
Tolerance CD2015FC ±1% Standard.
80
60
40
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
20
0
CD2520FC Standard Resistance Values:
Tolerance CD2520FC ±1% Standard.
25
70
100
150
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
AMBIENT TEMPERATURE, oC
Note 2: 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 solder
pad temperature at the center of the solderable pedestal (point X in the recommended circuit
layouts shown below). Maximum temperature of the chip resistor (at the center of chip)
Custom resistance values and non-standard tolerances
can be manufactured for high quantity applications.
Please contact Caddock Applications Engineering.
should not exceed 150°C through the temperature range of the application
.
Recommended Circuit Board Layout
(current and sense connections):
C
C
Note: Actual width of current trace is based on
magnitudeofcurrent. Pointof connectionshould
be in the area shown.
Fig. 1A: Recommended Kelvin layout.
X
X
C = Current connection
S = Sense connection
S
S
Applications Engineering
Sales and Corporate Office
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
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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