MAX14 Aavid Thermalloy, MAX14 Datasheet - Page 35

• Manufacturer Part Number: MAX14
• Description: MAX CLIP
• Manufacturer: Aavid Thermalloy
• Series: Max Clip System™r

Specifications of MAX14

• Accessory Type: Clip(s)
• Product: Hardware & Accessories
• Designed For: TO-220
• For Use With/related Products: Max Clip System™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 32613

www.aavidthermalloy.com
2.0
1.5
1.0
0.5
2.0
1.6
1.2
0.8
0.4
1.4
1.3
1.2
1.1
1.0
0.9
D E LT A T = (H EAT S INK TE MP. -AMBI EN T TEM P.)º C
50
80
T H E R M A L R E S I S T A N C E v s A I R S P E E D
T H E R M A L R E S I S T A N C E vs L E N G T H
T H E R M A L R E S I S T A N C E v s ( T s - T a )
75 70 65 60 55 50 45
1.0
100
E X T R U S I O N L E N G T H mm
150
A I R S P E E D m / s
2.0
AMERICA
EUROPE
200
3.0
250
Italy Tel: [phone] email: [e-mail]
United Kingdom Tel: [phone] email: [e-mail]
USA Tel: [phone] email: [e-mail]
300
4.0
40
350
35 30
5.0
400
HOW TO INTERPRET THERMAL PERFORMANCE
The extrusions are presented in order by shape and size. Dimensions
are in mm with (inches) following in parenthesis. On pages 5-6 there
is an index sorted by extrusion part number. The part number, weight
in kg/m, thermal resistance (
resistance
is shown for each extrusion. The thermal resistances have been
calculated using 150 mm long vertical anodized heat sinks with
a sink-to-ambient temperature difference of 75ºC and a uniform
thermal load on the heat sink base.
LENGTH CORRECTION FACTOR
Because the air heats up while circulating through the extrusion,
the convection coefficient is not constant throughout the extrusion
length. Therefore, the thermal resistance changes nonlinearly as
the length changes. To calculate the correct thermal resistance for
extrusion lengths other than the standard 150 mm length, multiply
the given thermal resistance data by the appropriate factor taken
from the thermal resistance vs length graph shown. The same
correction factor must be used for thermal resistance in both
natural convection and forced convection.
TEMPERATURE CORRECTION FACTOR
Both natural convection and radiation coefficients are related to the
sink-to-ambient temperature difference. To evaluate the thermal per-
formance of a heat sink for an application requiring a sink-to-ambient
temperature rise other than 75ºC, use the correction factor from the
thermal resistance vs (Ts - Ta) graph shown. This factor must be used
only for thermal resistance in natural convection.
AIR SPEED CORRECTION FACTOR
The convection coefficient is also closely related to the air speed
through the fins. Since evaluation of air speed through the fins is
difficult to evaluate under normal circumstances, we show the
thermal resistance of an extrusion in forced convection evaluated
using a tunnel the same size as the extrusion. For a tunnel airflow
other than 2 m/s, refer to the factor in the thermal resistance vs
air speed graph shown. Use this factor to figure thermal resistance
in forced convection.
θ
f with forced convection) at an air speed of 2.0 m/s
ASIA
Singapore Tel: [phone] email: [e-mail]
Taiwan Tel: [phone] email: [e-mail]
θ
n with natural convection, thermal
Thermal Performance
35