Bonded Fin & Brazed Fin Heat Sink Assemblies

Increased Surface Area Solutions for High Power Applications

Bonded Fin & Brazed Fin Heat Sink Assemblies

Product Details Key Industries Related Products

Bonded fin heat sinks are an assembly of a grooved base with individual fins bonded into the grooves. This type of heat sink fabrication allows for higher fin densities and fin aspect ratios than what is manufacturable with extrusion methodologies, greatly improving thermal performance as compared to extruded heat sinks due to increased surface area.

Bonded fin types can be constructed in a few ways. Grooved bases can be extruded, die cast, or machined. Machining can allow for additional features like embedded heat pipes, vapor chambers, or encapsulated graphite heat spreaders. Fins are either punched from coil stock or cut from thin plate stock. The fins are inserted into the base grooves and are joined by epoxying, brazing, or soldering.

The epoxy used for bonding is specially formulated to have high thermal conductivity, however brazing offers greater structural integrity and the best thermal performance. Aavid, Thermal Division of Boyd Corporation employs a variety of brazing techniques including CAB, vacuum, and dip brazing. Aluminum must be nickel plated to be soldered.

Aavid's broad portfolio of standard extruded bases and standard cut aluminum fins allows us to quickly design and manufacture semi-custom epoxy bonded fin solutions as well as fully custom heat sinks and systems featuring bonded or brazed fin types.


Product Details

Bonded & Brazed Fin Heat Sink Product Details:

  • Materials:
    • Aluminum
    • Copper
    • Stainless Steel
    • Inconel
  • General Design Guidelines:
    • Fin thickness typically ranges from .010” to .080” (other thicknesses as needed)
    • Brazed, soldered or thermal epoxy bonded depending on thermal resistance required
    • Fins can easily be non-uniform geometry, especially length, with no post machining


Standard Bonded Fin Heat Sinks:

Part Number

Reference Figure

Flanges

Finish

A Dim

B Dim

°C/W

RoHS

Purchase

476700U00000

1

None

Unfinished

178 mm (7.0 in.)

0.3

Compliant

Contact Us

476700C00000

1

None

Gold Chromate

178 mm (7.0 in.)

0.3

CompliancePending

Contact Us

476700L00000

1

None

Clear Chromate

178 mm (7.0 in.)

0.3

CompliancePending

Contact Us

476900U00000

2

25 mm (1 in.) wide

Unfinished

178 mm (7.0 in.)

64 mm (2.5 in.)

0.3

Compliant

Contact Us

476900C00000

2

25 mm (1 in.) wide

Gold Chromate

178 mm (7.0 in.)

64 mm (2.5 in.)

0.3

CompliancePending

Contact Us

476900L00000

2

25 mm (1 in.) wide

Clear Chromate

178 mm (7.0 in.)

64 mm (2.5 in.)

0.3

CompliancePending

Contact Us

477000U00000

2

25 mm (1 in.) wide

Unfinished

305 mm (12 in.)

127 mm (5.00 in.)

0.22

Compliant

Contact Us

477000C00000

2

25 mm (1 in.) wide

Gold Chromate

305 mm (12 in.)

127 mm (5.00 in.)

0.22

CompliancePending

Contact Us

477000L00000

2

25 mm (1 in.) wide

Clear Chromate

305 mm (12 in.)

127 mm (5.00 in.)

0.22

CompliancePending

Contact Us

"

Part Number

Reference Figure

Finish

A Dim

B Dim

C Dim

°C/W

RoHS

Purchase

476200U00000

3

Unfinished

178 mm (7.0 in.)

241 mm (9.5 in.)

95 mm (3.75 in.)

0.08

Compliant

Contact Us

476200C00000

3

Gold Chromate

178 mm (7.0 in.)

241 mm (9.5 in.)

95 mm (3.75 in.)

0.08

CompliancePending

Contact Us

476200L00000

3

Clear Chromate

178 mm (7.0 in.)

241 mm (9.5 in.)

95 mm (3.75 in.)

0.08

CompliancePending

Contact Us

476300U00000

3

Unfinished

305 mm (12 in.)

368 mm (14.5 in.)

159 mm (6.25 in.)

0.06

Compliant

Contact Us

476300C00000

3

Gold Chromate

305 mm (12 in.)

368 mm (14.5 in.)

159 mm (6.25 in.)

0.06

CompliancePending

Contact Us

476300L00000

3

Clear Chromate

305 mm (12 in.)

368 mm (14.5 in.)

159 mm (6.25 in.)

0.06

CompliancePending

Contact Us

476400U00000

4

Unfinished

305 mm (12 in.)

371 mm (14.59 in.)

152 mm (6.00 in.)

0.028

Compliant

Contact Us

476400C00000

4

Gold Chromate

305 mm (12 in.)

371 mm (14.59 in.)

152 mm (6.00 in.)

0.028

CompliancePending

Contact Us

476400L00000

4

Clear Chromate

305 mm (12 in.)

371 mm (14.59 in.)

152 mm (6.00 in.)

0.028

CompliancePending

Contact Us

476600U00000

4

Unfinished

406 mm (16 in.)

472 mm (18.59 in.)

203 mm (8.00 in.)

0.024

Compliant

Contact Us

476600C00000

4

Gold Chromate

406 mm (16 in.)

472 mm (18.59 in.)

203 mm (8.00 in.)

0.024

CompliancePending

Contact Us

476600L00000

4

Clear Chromate

406 mm (16 in.)

472 mm (18.59 in.)

203 mm (8.00 in.)

0.024

CompliancePending

Contact Us

"

  

  



Custom Bonded Fin Heat Sink Extruded Base Options:

Base Number

Base Profile

Profile Code

Width (mm)

# of Fins

Purchase

68520

18

60.2

18

Contact Us

69920

32

77.98

28

Contact Us

74915

33

81.28

21

Contact Us

65800

03

101.6

20

Contact Us

66565

06

120.65

20

Contact Us

65740

05

121.41

16

Contact Us

66780

07

127

34

Contact Us

72075

34

127

42

Contact Us

70135

35

127

25

Contact Us

66280

09

167.89

33

Contact Us

68180

20

176.02

46

Contact Us

66580

11

187.2

31

Contact Us

64125

12

187.2

20

Contact Us

65805

13

203.2

40

Contact Us

67650

14

204.72

64

Contact Us

72310

38

228.6

45

Contact Us

67350

15

273.81

45

Contact Us

69320

22

316.23

66

Contact Us

66520

17

431.8

49

Contact Us

Bonded Fin Heat Sink Solutions

  • Lower Tooling Costs
  • No Limit on Airflow Length
  • Improved Thermal Performance
  • Wide Range of Material and Fabrication Options
  • Customize the base with embedded heat pipes, vapor chambers, or encapsulated graphite to improve heat spreading and increase overall efficiency of the heat sink
  • Increase heat transfer with more airflow from axial fans or high performance Double Width, Double Inlet (DWDI) blowers
  • Add interface materials like thermal grease to reduce thermal interface resistance
  • Duct inlet and outlet airflow with electrically isolating air ducts made with LectroShield Electrical Isolation.