401A Wakefield Thermal Solutions, 401A Datasheet - Page 4

• Manufacturer Part Number: 401A
• Description: HEATSINK POWER TO-3 BLK
• Manufacturer: Wakefield Thermal Solutions
• Series: 401r

Specifications of 401A

• Height: 1.250" (31.7mm)
• Color: Black
• Package Cooled: TO-3
• Attachment Method: Bolt On
• Outline: 120.65mm x 38.10mm
• Power Dissipation @ Temperature Rise: 30W @ 80°C
• Thermal Resistance @ Forced Air Flow: 1.5°C/W @ 250 LFM
• Thermal Resistance @ Natural: 2.6°C/W
• Product: Heatsinks
• Mounting Style: Screw
• Heatsink Material: Aluminum
• Fin Style: Unidirectional Fin
• Dimensions: 38.1 mm L x 111.1 mm W x 31.8 mm H
• Designed For: TO-3, Stud Mounted Semiconductor Cases
• Packages Cooled: TO-3
• Thermal Resistance: 80°C/W
• Width: 120.7mm
• Heat Sink Material: Aluminum
• Length: 38.1mm
• Size: 1.250H X 4.750W"
• Mounting Type: PC Board Through Hole
• Package / Case: TO-3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 345-1047; 401-A

EXTRUDED HEAT SINKS FOR POWER SEMICONDUCTORS
Wakefield Engineering has designed four standard heat sink types for ease of installation and
efficient heat dissipation for industry standard hex-type rectifiers and similar stud-mount
power devices: 465, 476, 486, and 489 Series. The 465 and 476 Series shown here are
These two heat sink types accept industry standard 1.750 in. (44.5) hex-type devices for
mounting and efficient heat dissipation. Each type is provided with a 1.750 in. (44.5) x 2.000
Dimensions: in. (mm)
Dimensions: in. (mm)
Normally stocked
MOUNTING HOLES
SEMICONDUCTOR
Standard
P/N
465K
476W
486 AND 489 SERIES
Standard
P/N
486K
489K
465 AND 476 SERIES
476K
476 SERIES (EXTRUSION
PROFILE 1245)
SERIES
4.000 (101.6)
5.000 (127.0)
5.000 (127.0)
6.250 (158.8)
6.250 (158.8)
486
489
in. (mm)
in. (mm)
Width
Width
MECHANICAL DIMENSIONS
Nominal Dimensions
Nominal Dimensions
High-Power Heat Sinks for Medium Hex-Type Rectifiers and Diodes
5.000 (127.0)
6.000 (152.4)
6.000 (152.4)
Heat Sinks for High-Power Hex-Type Rectifiers and Diodes
6.000 (152.4)
9.000 (228.6)
in. (mm)
K
in. (mm)
Length
Length
MECHANICAL DIMENSIONS
5.000 (127.0)
6.250 (158.8)
6.250 (158.8)
4.000 (101.6)
5.000 (127.0)
in. (mm)
in. (mm)
Height
Height
W
53
1.060 in. Hex
1.250 in. Hex
1.250 in. Hex
1.750 in. Hex
1.750 in. Hex
465 SERIES (EXTRUSION
Hex Style
Hex Style
designed for 1.060 in. Hex (465 Type) and 1.250 in. Hex (476 Type). The 476W Type is avail-
able predrilled for an 0.765 in. (19.4) dia, mounting hole, Material: Aluminum Alloy, Black
anodized.
in. (50.8) area on the semiconductor base mounting surface which is free of anodize.
Material: Aluminum Alloy, Black Anodized.
Type
Type
PROFILE 1244)
486 AND 489 SERIES
PROFILE 1541)
(EXTRUSION
Center Mount
Hole Pattern
Hole Pattern
(19.4)Dia.
Mounting
0.765 in.
Mounting
None
None
None
None
All other products, please contact factory for price, delivery, and minimums.
SEMICONDUCTOR
MOUNTING HOLE
Natural Convection
Natural Convection
Thermal Performance at Typical Load
CONVECTION CHARACTERISTICS
Thermal Performance at Typical Load
38°C @ 5OW
25°C @ 5OW
25°C @ 5OW
24° C @ 50W
86° C @ 250W
19° C @ 50W
75° C @ 250W
NATURAL AND FORCED
CONVECTION CHARACTERISTICS
NATURAL AND FORCED
0.27°C/W @500 LFM
0.19°C/W @500 LFM
0.19°C/W @500 LFM
0.20° C/W @250 LFM
0.13° C/W @500 LFM
0.15° C/W @250 LFM
0.10° C/W @500 LFM
Forced Convection
Forced Convection
K
Heat Sinks
4.2100 (1909.66)
6.1400 (2785.10)
2.8200(1279.15)
2.8000(1270.08)
1.9300 (875.45)
Stud-Mount
Stud-Mount
Extruded
lbs. (grams)
lbs. (grams)
Weight
Weight