CM320202
http://onsemi.com
10
APPLICATION INFORMATION (Cont’d)
PCB Layout Considerations
The CM320202 has a heat spreader (exposed pad) attached to the bottom of the WDFN8 package in order for the heat to
be transferred more easily from the package to the PCB. The heat spreader is a copper pad with slightly smaller dimensions
than the package itself. By positioning the matching pad on the PCB top layer to connect to the spreader during manufacturing,
the heat will be transferred between the two pads. Thermal Layout for WDFN8 package shows the CM320202 recommended
PCB layout. Please note there are four vias to allow the heat to dissipate into the ground and power planes on the inner layers
of the PCB. Vias must be placed underneath the chip but this can result in solder blockage. The ground and power planes need
to be at least 2 square inches of copper by the vias. It also helps dissipation if the chip is positioned away from the edge of the
PCB, and away from other heatdissipating devices. A good thermal link from the PCB pad to the rest of the PCB will assure
the best heat transfer from the CM320202 to ambient temperature.
Figure 2. Thermal Layout for WDFN8 Package
Vias (0. 3 mm Diameter)
Thermal PAD
Solder Mask
Pin Solder Mask
Top Layer Copper
Connects to Heat Spreader
Bottom Layer
Ground Plane
Top View
CM320202
http://onsemi.com
11
PACKAGE DIMENSIONS
WDFN8, 3x3, 0.65P
CASE 511BH01
ISSUE O
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.15 AND 0.30 MM FROM TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
A
D
E
B
C0.10
PIN ONE
2X
REFERENCE
2X
TOP VIEW
SIDE VIEW
BOTTOM VIEW
L
D2
E2
C
C0.10
C0.10
C0.08
A1
SEATING
PLANE
8X
NOTE 3
b
8X
0.10 C
0.05 C
A
BB
DIM MIN MAX
MILLIMETERS
A 0.70 0.80
A1 0.00 0.05
b 0.25 0.35
D 3.00 BSC
D2 2.20 2.40
E 3.00 BSC
E2 1.40 1.60
e 0.65 BSC
L 0.20 0.40
1
4
8
*For additional information on our PbFree strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
0.65
PITCH
1.66
3.30
1
DIMENSIONS: MILLIMETERS
0.53
8X
NOTE 4
0.40
8X
DETAIL A
A3 0.20 REF
A3
A
DETAIL B
L1
DETAIL A
L
ALTERNATE
CONSTRUCTIONS
A1
A3
L
DETAIL B
MOLD CMPDEXPOSED Cu
ALTERNATE
CONSTRUCTIONS
L1 −−− 0.15
OUTLINE
PACKAGE
e
RECOMMENDED
K 0.45 REF
5
2.46
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 8002829855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81357733850
CM320202/D
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
Email: orderlit@onsemi.com
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative

CM3202-02DE

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
IC REG CONV DDR 2OUT 8WDFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet