EX-SERIES Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Vertical through-hole PCB mounting

EX Series Heatsinks
For TO-220 and TO-247 devices and bridge rectifiers
F e a t u r es
• Vertical through-hole PCB mounting
• E3A-T220-25E has a 8-32 threaded mounting hole
for a bridge rectifier in a D34 type square package
• The thickened side fins can be used to secure the
heat sink to aside wall or to mount TO-220"s
• Threaded mounting holes
S E RI E S S P E CI F ICATI O N S

For
Ohmite
Heatsink
Package
Resistor
Part Number
Type
Series
E2A-T220-38E
TO-220
TBH, TCH
E2A-T220-25E
TO-220
TBH, TCH
E2A-T247-38E
TO-247
TEH100
E3A-T220-25E
D34
*Natural convection at 5W dissipation
Surface
Area
(in² /mm²)
Weight
(oz./g)
7.96 / 5129 0.40 / 11.21
5.30 / 2419 0.26 / 7.5
7.95 / 5129 0.40 / 11.21
9.4 / 6064 0.60 / 17.0
Thermal
Resistance*
(°C/W)
14.0
16.4
14.0
12.4
characteristics
Heat sink Aluminum 6063-T5 or equiv-
alent with either black anod-
ized or degreased finish
Solder feet steel tin plated
Interface for improvement, use thermal
thermal joint compound or 0.005
resistance Grafoil (TGon 800 by Laird)
Interface Sil-Pad 900S by Bergquist or
electrical equivalent
isolation
Heat Dissipation
0
100
90
80
70
60
50
40
30
20
10
0
0
Air Velocity (ft./min.)
100 200 300 400 500 600 700 800 900 1000
10
9
8
7
E2A-T220-25E
6
E2A-T220-38E
E2A-T247-38E 5
E3A-T220-25E
4
3
2
1
0
1 2 3 4 5 6 7 8 9 10
Heat Dissipated (watts)
172
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
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