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W Series Heatsinks
For to-220 and to-247 devices
T220 0.72" (18.3mm) T247 0.92" (23.4mm) 0.63" (16.0mm)
The unique design (patent pending) of the W Series heat sinks combines a tin plated, solderable, integral spring clip with an extruded aluminum heat sink body for an all-in-one solution to through-hole mounting of TO-220 or TO-247 packages. These self-aligning heat sinks feature solderable feet and an integrated clip with 13.2 (lbf) of force on the center of the device to enhance thermal performance.
FeatuRes
* ReducedAssemblyCost: spring clip and auto-align feature makes fasteners and fixtures obsolete, along with stray metal filings from tapped holes * MaximumRepeatability:clamping force of the spring clip is not degraded by repeated loading and unloading * MaximumHeatTransferper UnitSpace:maximum surface area per unit volume and consistent mounting force reduces thermal resistance * MaximumResistancetoShock andVibration:light weight, resilient spring clip locks the component in place and is highly resistant to shock and vibration
T220 1.20" (30.5mm) T247 1.20-1.26" (30.5-32.0mm) 0.14" (3.6mm) T220 0.50" (12.7mm) T247 0.71" (18.0mm) Pin diameter 0.06" (1.5mm)
* MaximumReliability:helps prevent short circuits by eliminating metal particles from thread tapping * RoHS Compliant
speciFications
HeatSink:Aluminum alloy 6063T5 or equivalent. SpringClip:Music wire, per ASTM A228 Pin:Solderable 100% tin over copper strike Interfacethermalresistance: for improvement, use thermal joint compound or 0.005 Grafoil (TGon 800 by Laird) Interfaceelectricalisolation: Sil-Pad 900S by Bergquist or equivalent Mounting: Vertical thru-hole mount ClipForce: 13.2 lbf.
Patent Pending
Heat Dissipation
T220-101E T247-101E For ohmite package Resistor type series DT2-101E surface area (in2) Weight T220-101E and T247-101E
250 200 Air Velocity (ft./min.) 400 600 800 T220-101E T247-101E 1000 14 12 10 150 8 6 Free Air 50 4 Air Flow along Fins 2 0 0 2 4 12 8 Heat Dissipated (watts) Air Velocity (ft./min.) 100 200 400 600 800 1000 12 10 8 6 Air Flow along Fins 4 2 0 0 2 4 8 12 Heat Dissipated (watts) 16 20 Thermal Resistance from Mounting Surface to Ambient (C/watts) 16 20 Thermal Resistance from Mounting Surface to Ambient (C/watts)
Mounting Surface Temp. Rise above Ambient (C)
Heatsink part number Wa-t220-101e WV-t220-101e WA-T247-101E WV-t247-101e Wa-Dt2-101e WV-Dt2-101e
thermal Resistance* TO-220 TBH25, TCH35 6.5 0.35 oz/10g Rs-a=12C/W Rs-a=13C/W Rs-a=11C/W TO-247 TEH70, TEH100 8.4 0.42 oz/12g Rs-a=12C/W TO-220 TBH25, TCH35, 15.1 0.79 oz/22g Rs-a=7C/W & TO-247 TEH70, TEH100 Rs-a=8C/W *Natural convection at 10W heat dissipation
200
Air Flow Side to Side
100
lanD patteRn
0.63" (16.0mm) 0.08" (2.0mm) o 0.050" (1.3mm)
C L
0
DT2-101E
140 Mounting Surface Temp. Rise above Ambient (C)
DT2-101E 120 100 80 60 40 20 0 Air Flow Side to Side Free Air
0.72" 0.500" (18.3mm) (12.7mm) 0.711" T247 0.92" (23.4mm) (18.1mm) T220
0.06" (1.5mm)
o 0.080" (2.0mm)
0.27" 0.18" (6.9mm) (4.6mm) 0.711" (18.1mm) 0.08" (2.0mm) 0.28" (16mm) 0.63" (16.0mm)
o 0.080" (2.0mm) DT2 0.18" (4.6mm)
1.71" (43.4mm) 0.500" (12.7mm)
C L
S ta n d a r d pa rt n u m b e r S F o r W S e r i e S
part number WA-T220-101E WV-T220-101E WA-T247-101E WV-T247-101E WA-DT2-101E WV-DT2-101E Description Heat sink for TO-220, black anodized Heat sink for TO-220, degreased Heat sink for TO-247, black anodized Heat sink for TO-247, degreased Heat sink for TO-247 &TO-220, black anodized Heat sink for TO-247 &TO-220 , degreased packaging Bulk Bulk Bulk Bulk Bulk Bulk
o 0.050" typ. (1.3mm)
0.89" (22.6mm) 0.59" (15mm) 0.79" (20.1mm)
72
Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 * 1-866-9-OHMITE * Int'l 1-847-258-0300 * Fax 1-847-574-7522 * www.ohmite.com * info@ohmite.com

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