Ohmite Manufacturing has
launched a series of heatsink
solutions for use with our
popular TO-220 and TO-247
power resistors, or similarly
packaged semiconductors.
These self aligning heatsinks
feature solderable feet for
through-hole placement, and
an integrated clip which pro-
vides 13.2 (lbf) of force on the
center of the resistor, enhanc-
ing thermal performance and
reducing parts count and
assembly time.
S P E ꢀ ꢁ F ꢁ ꢀ A T ꢁ O N S
Heat Sink: Aluminum alloy 6063-
T5 or equivalent. Copper alloy
C110 or equivalent
WV Series Heatsinks
For TO-220 and TO-247 devices
Spring Clip: Music wire, per
ASTM A228
0.72" (18.3mm)
0.92" (23.4mm)
0.63"
(16.0mm)
T220
T247
Foot: Cold-rolled steel, per ASTM
A366, commercial quality or
equivalent
Insulator: (optional) Sil-pad
900-S, K6 800-S, and K10, or
equivalent
T220
1.20"
(30.5mm)
Mounting: thru-hole, vertical
T247
1.20-1.26"
(30.5-32.0mm)
Suggested Sil Pad: Sil-Pad 900S
(Manufactured by Bergquist)
Clip Force: 13.2 lbf.
0.14"
(3.6mm)
T220 0.50" (12.7mm)
T247 0.71" (18.0mm)
For
Package Resistor
Type Series
Ohmite
Surface
Area
Heatsink
Part Number
Thermal
Weight Resistance*
(in2)
WV-T220-101E TO-220 TBH25, TCH35 6.5 0.35 oz/10g Rs-a=10°C/W
WV-T247-101E TO-247 TEH70
8.4 0.42 oz/12g Rs-a=7°C/W
*Natural convection
WV-T220-101E
WV-T247-101E
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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