621 AND 623 SERIES (EXTRUSION PROFILE 1327)
NATURAL AND FORCED
CONVECTION CHARACTERISTICS
SEMICONDUCTOR MOUNTING HOLES
AK
302 AND 303 SERIES
301 SERIES
NATURAL AND FORCED
CONVECTION CHARACTERISTICS
SEMICONDUCTOR MOUNTING HOLES
K
SERIES
301
302
303
MN
Extruded
Heat Sinks
45
EXTRUDED HEAT SINKS FOR POWER SEMICONDUCTORS
Low-Profile Heat Sinks for All Metal-Case Power Semiconductors
Footprint Thermal Performance at Typical Load
Standard Dimensions Height Mounting Natural Forced Weight
P/N in. (mm) in. (mm) Hole Pattern Convection Convection lbs. (grams)
621A 4.750 (120.6) x 1.500 (38.1) 0.461 (11.7) (1) TO-3 75°C @ 15W 2.0°C/W @ 250 LFM 0.1000 (45.36)
621K 4.750 (120.6) x 1.500 (38.1) 0.461 (11.7) None 75°C @ 15W 2.0°C/W @ 250 LFM 0.1000 (45.36)
623A 4.750 (120.6) x 3.000 (76.2) 0.461 (11.7) (1) TO-3 52°C @ 15W 1.5°C/W @ 250 LFM 0.2100 (95.26)
623K 4.750 (120.6) x 3.000 (76.2) 0.461 (11.7) None 52°C @ 15W 1.5°C/W @ 250 LFM 0.210O (95.26)
A general purpose yet efficient heat dissipator for TO-3 and virtually all other styles of metal case
power semiconductor package types, the 621 and 623 Series low-profile flat back heat sinks find a
wide variety of applications. The central channel between fins measures 1.300 in. (33.0) (min.) in
width, accommodating many types of packages. Mounting hole pattern "A" is predrilled for the
standard TO-3 package. Material: Aluminum Alloy, Black Anodized.
TO-3
MECHANICAL DIMENSIONS
Dimensions: in. (mm)
Compact Heat Sinks for Dual Stud-Mounted Semiconductor Cases
Outline Mounting Thermal Performance at Typical Load
Standard Dimensions Length “A” Hole (s) Natural Forced Weight
P/N in. (mm) in. (mm) Pattern and Number Convection Convection lbs. (grams)
301K 2.000 (50.8) x 2.000 (50.8) 0.750 (19.1) None 70°C @ 15W 2.5°C/W @ 250 LFM 0.0580 (26.31)
301M 2.000 (50.8) x 2.000 (50.8) 0.750 (19.1) (1) 10-32UNF, 0.625 in. thread depth 70°C @ 15W 2.5°C/W @ 250 LFM 0.0580 (26.31)
301N 2.000 (50.8) x 2.000 (50.8) 0.750 (19.1) (1) 1
⁄4-28UNF, 0.625 in. thread depth 70°C @ 15W 2.5°C/W @ 250 LFM 0.0580 (26.31)
302M 2.000 (50.8) x 2.000 (50.8) 1.500 (38.1) (1) 10-32UNF, 0.625 in. thread depth 50°C @ 15W 1.8°C/W @ 250 LFM 0.1330 (60.33)
302MM 2.000 (50.8) x 2.000 (50.8) 1.500 (38.1) (2) 10-32UNF, 0.625 in. thread depth 50°C @ 15W 1.8°C/W @ 250 LFM 0.1330 (6033)
302N 2.000 (50.8) x 2.000 (50.8) 1.500 (38.1) (1) 1
⁄4-28UNF, 0.625 in. thread depth 5O°C @ 15W 1.8°C/W @ 250 LFM 0.1330 (60.33)
302NN 2.000 (50.8) x 2.000 (50.8) 1.500 (38.1) (2) 1
⁄4-28UNF, 0.625 in. thread depth 50°C @ 15W 1.8°C/W @ 250 LFM 0.1330 (60.33)
303M 2.000 (50.8) x 2.000 (50.8) 3.000 (76.2) (1) 10-32UNF, 0.625 in. thread depth 37°C @ 15W 1.3°C/W @ 250 LFM 0.2680 (121.56)
303MM 2.000 (50.8) x 2.000 (50.8) 3.000 (76.2) (2) 10-32UNF, 0.625 in. thread depth 37°C @ 15W 1.3°C/W @ 250 LFM 0.2680 (121.56)
303N 2.000 (50.8) x 2.000 (50.8) 3.000 (76.2) (1) 1
⁄4-28UNF, 0.625 in. thread depth 37°C @ 15W 1.3°C/W @ 250 LFM 0.2680 (121.56)
303NN 2.000 (50.8) x 2.000 (50.8) 3.000 (76.2) (2) 1
⁄4-28UNF, 0.625 in. thread depth 37°C @ 15W 1.3°C/W @ 250 LFM 0.2680 (121.56)
The large fin area in minimum total volume provided by the radial design of the 301/302/303
Series offers maximum heat transfer efficiency in natural convection. All types are available
with one tapped mounting hole for rectifiers and other stud-mounting semiconductors; the
302 and 303 Series offer maximum cost savings with dual mounting locations (“MM” and
“NN” mounting hole patterns) for two stud-mount devices. Material: Aluminum Alloy, Black
Anodized.
STUD-MOUNT
621/623 SERIES
301/302/303 SERIES
MECHANICAL DIMENSIONS
Dimensions: in. (mm)