657-20ABPN Wakefield Thermal Solutions, 657-20ABPN Datasheet - Page 11

• Manufacturer Part Number: 657-20ABPN
• Description: Heat Sink
• Manufacturer: Wakefield Thermal Solutions

Specifications of 657-20ABPN

• Packages Cooled: TO-218 / TO-220 / TO-247
• Thermal Resistance: 32°C/W
• Width: 41.9mm
• Height: 50.8mm
• Heat Sink Material: Aluminum
• Peak Reflow Compatible (260 C): No
• Length: 25.4mm
• Leaded Process Compatible: No
• Product: Heatsinks
• Mounting Style: Through Hole
• Heatsink Material: Aluminum
• Dimensions: 25.4 mm L x 41.9 mm W x 50.8 mm H
• Designed For: TO-220, TO-247, TO-218
• Color: Black
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

BOARD LEVEL POWER SEMICONDUCTOR HEAT SINKS
Designed for mounting horizontally or vertically on a circuit board, 291 Series heat sinks
employ a unique clip for attachment of TO-220 case styles.
All other products, please contact factory for price, delivery, and minimums.
Board Level
Heat Sinks
MECHANICAL DIMENSIONS
MECHANICAL DIMENSIONS
MECHANICAL DIMENSIONS
Dimensions: in. (mm)
Dimensions: in. (mm)
237 AND 252 SERIES
250-122AB
250 SERIES
Standard
P/N
250-122AB
250-122AB-09
250-122AB-25
Material: Aluminum, Black Anodized
237 AND 252 SERIES
Standard
P/N
237-167AB2
237-167AB3
237-167AB2-24
252-167AB2
252-167AB3
252-167AB2-24
Order SpeedClips™ 285SC or 330SC separately for rapid component installation, lowering manufacturing costs. Material: Aluminum, Black Anodized
291 SERIES
Standard
P/N
291-C236AB
291-H36AB
Material: Aluminum, Black Anodized
237-167AB3
252-167AB3
227-167
Height Above
Dimensions: in. (mm)
1.675 (42.5)
1.675 (42.5)
1.675 (42.5)
1.675 (42.5)
1.675 (42.5)
1.675 (42.5)
High-Performance Slim Profile Heat Sinks With Integral Clips
Height Above
Labor-Saving Clip-on Heat Sinks
1.220 (31.0)
1.220 (31.0)
1.380 (35.1)
PC Board
in. (mm)
Height Above
0.860 (21.)9
0.860 (21.9)
237-167AB3
PC Board
in. (mm)
PC Board
in. (mm)
237 AND 252 SERIES
High-Performance, High-Power Vertical Mount Heat Sinks
291-C2
1.000 (25-4) x 1.000 (25.4)
1.000 (25.4) x 1.000 (25.4)
1.000 (25.4) x 1.000 (25.4)
1.000 (25.4) x 1.000 (25.4)
1.000 (25.4) x 1.000 (25.4)
1.000 (25.4) x 1.000 (25.4)
1.000 (25.4) x .500 (12.7)
252-167
1.000 (25.4) x .500 (12.7)
1.000 (25.4) x .500 (12.7)
1.100 (27.0) x 0.360 (9.1)
1.100 (27.0) x 0.360 (9.1)
Mounting Footprint
Dimensions
Dimensions
Footprint
Footprint
250 SERIES
in. (mm)
in. (mm)
252-167AB3
Dimensions
in. (mm)
Vertical
291 SERIES
237-167AB2
252-167AB2
291-H
40
250-122AB-09
Configuration
Configuration
Vert./Horiz.
Mounting
Mounting
237-167AB2-24
252-167AB2-24
One type is available with a locking clip and one with a 0.140 in. (3.6) diameter mounting
hole only.
TO-220 (Mtg. Hole)
Vertical
Vertical
Vertical
Vertical
Vertical
Vertical
Vertical
Vertical
TO-220 (Clip)
Mounting
Style
2, Solderable
2, Solderable
Tab Options
Tab Options
Solderable
Solderable
2, Twisted
3, Twisted
2, Twisted
3, Twisted
No Tab
250-122AB-25
25
09
Thermal Performance at Typical Load
80° C @ 2W
68° C @ 2W
Convection
Natural
Clip/Mtg Slot
Clip/Mtg Slot
Clip/Mtg Slot
Clip/Mtg Slot
Clip/Mtg Slot
Clip/Mtg Slot
Mounting
Mounting
CONVECTION CHARACTERISTICS
Style
Style
Clip
Clip
Clip
NATURAL AND FORCED
CONVECTION CHARACTERISTICS
CONVECTION CHARACTERISTICS
24°C/W @ 600 LFM
16°C/W @ 600 LFM
NATURAL AND FORCED
Thermal Performance at Typical Load
Thermal Performance at Typical Load
50°C @ 4W
46° C @ 4W
46° C @ 4W
46° C @ 4W
40° C @ 4W
40° C @ 4W
40° C @ 4W
NATURAL AND FORCED
Convection
50°C @ 4W
50°C @ 4W
Convection
Convection
Natural
Natural
Forced
3.7°C/W @ 400 LFM
3.7°C/W @ 400 LFM
3.7°C/W @ 400 LFM
4.5° C/W @ 200 LFM
4.5° C/W @ 200 LFM
4.5° C/W @ 200 LFM
4.5° C/W @ 200 LFM
4.5° C/W @ 200 LFM
4.5° C/W @ 200 LFM
Convection
Convection
Forced
Normally stocked
Forced
0.0026 (1.18))
0.0026 (1.18)
lbs. (grams)
Multiwatt
TO-220
TO-220
Weight