Thermal Management
Solutions for BGAs
BGA THERMAL SOLUTIONS MATRIX
The following table represents Wakefields recommendations for a variety of standard BGA sizes. However, this is by no means a complete
list of components that can be used with these heat sinks. To determine suitability for your particular component, request a BGA heat sink
evaluation kit.
BGA Heat Sink Heat Sink Height Recommended Attachment
Sizes (mm) Footprint (mm) (inches) Series # Method
17 17 x 17 .40 D10650 Adhesive
19 19 x 19 1.00 602 Adhesive
21 21 x 21 .40 D10850 Adhesive
21 21 x 21 .25 .35 .45 .60 624 Adhesive
23 22 x 22 .40 .60 604 Adhesive
23 22 x 22 .75 605 Adhesive
25 25 x 25 .25 .35 .45 .60 625 Adhesive
27 28 x 28 .25 .35 .45 .60 658 Adhesive
29 30 x 30 .77 606 Adhesive
31 31 x 28 .65 607 Adhesive
31 31 x 31 .80 611 Adhesive
33 32 x 32 .35 .40 610 Adhesive
35 35 x 35 .65 612 Adhesive
35 35 x 35 .25 .35 .45 .60 642 Adhesive
35 35 x 35 .25 .35 .45 .60 630 Adhesive
37.5 37 x 37 .50 613 Adhesive
37.5 37 x 37 .65 659 Adhesive
45.7 x 35.5 37 x 47 .80 617 Adhesive
40 38 x 38 .30 .50 1.00 614 Adhesive
37.5 38 x 38 .29 660 Adhesive
40 40 x 28 .35 643 Clip
40 40 x 40 .26 .53 655 Adhesive
42.5 41 x 41 .41 615 Adhesive
45 43 x 43 .20 .25 .35 .45 .60 628 Adhesive
45 43 x 43 .15 662 Adhesive
47.5 47 x 47 .80 616 Adhesive
50 50 x 50 .40 .65 .80 1.00 698 Adhesive
50 51 x 51 .20 1.00 618 Adhesive
50 52 x 51 .80 622 Adhesive
50 53 x 47 .40 .65 .80 1.00 798 Adhesive
50 64 x 51 .24 620 Adhesive
up to 45 73 x 50 .50 1.00 609 Clip
up to 45 73 x 50 .95 619 Clip
RoHS COMPLIANCE
Please note that Wakefield part numbers designated with an E in this catalog denote new parts in compliance with the RoHS ini-
tiative, with the exception of our Precision Clamps. Wakefield will still continue to offer non-RoHS compliant versions of these parts.
Please be aware that many Wakefield Standard parts have always been compliant since their design inception and therefore will not
carry the E designation.
Wakefield requests that you refer to the RoHS compliance tool on our website at www.wakefield.com to verify RoHS compliance. If
you require further clarification or information regarding RoHS, please contact the factory.
2Thermal Interface
THERMAL INTERFACE MATERIAL PART NUMBER GUIDE
All of the heat sinks shown in this catalog are available with any of the following thermal tape and interface materials, pre-applied at the
factory. Use the T series, thermally enhanced, pressure sensitive adhesives to attach the heat sink to the electronic package and provide
a good thermal link to the heat sink. The S series interface materials have adhesives on only one side, for pre-attachment to the heat
sink, and provide superior thermal performance. Specify these materials in applications where the heat sink will be fixed to the electronic
package by some mechanical means other than a tape. Please note that none of these materials are for use in applications requiring elec-
trical isolation from the electronic device. All options other than -T1 and -T4 are RoHS compliant.
Note: To obtain the estimated thermal resistance of the interface material in your application, divide the thermal impedance value by the
area of the pad in square inches. For example, a 2 x 2 piece of T4 has a resistance of 1.10 C-in^2/W 4 in^2=0.275 C/W
T SERIES THERMALLY ENHANCED PRESSURE SENSITIVE ADHESIVES
Manufacturer Thermal Impedance Thickness,
Suffix Product C-in^2/W Inches Package Surface, Comments
-T1 Chomerics, T405 0.47 0.006 Metal/ceramic; aluminum carrier
-T1E Chomerics, T405R 0.47 0.006 RoHS-compliant version of -T1
-T3 Chomerics, T412 0.25 0.009 Metal/ceramic; very good
performance and conformity
-T4 Chomerics, T410 1.10 0.007 Plastic
-T4E Chomerics, T410R 1.10 0.007 RoHS-compliant version of -T4
-T5 Chomerics, T411 1.00 0.011 Plastic; conforms to out-of-flat packages
-T6 3M, 8810 0.88 0.010 Metal/ceramic; very good
adhesion and conformity
-T7 Bergquist, BP 108 1.28 0.008 Metal/ceramic; electrically insulating
S SERIES THERMAL INTERFACE PADS
Manufacturer Thermal Impedance Thickness,
Suffix Product C-in^2/W Inches Package Surface, Comments
-S4 Berquist Softface 0.06 0.005 All surfaces;
requires mechanical fasteners
ORDERING INFORMATION
Once you have chosen heat sink and thermal interface material that meets your thermal & mechanical requirements it is easy to
designate the part number. Simply add the interface material suffix referenced on the chart above to the base part number for the
heat sink. The base part number already includes information regarding its size and finish.
Example:
To order the 658 Series heat sink at .350 tall with the T5 thermal interface material, specify part number:
658-35AB - T5
From Catalog Page ?? From Table on Page ??
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