THick Film
AluminA
TA Series
Power Chip®
Thick Film on Alumina Substrate
Ohmite’s original Power Chip resistors feature our
thick film on alumina substrate technology. These
planar packages yield space saving, 10W/in2 power
densities that require over 50% less board space
than other radial packages. Convection cooling is
maximized by the planar package configuration
which dissipates heat well above board level.
Ohmite’s power chip resistors have a 125% higher
operating temperature range than competitive prod-
uct of similar design. High temperature solder and
in-process plating keep terminations secure under
self-heating effects by preventing re-flow from full
power operation.
F ꢀ AT u ꢁ ꢀ S
• High-Temp Terminal Construction
• Wide Resistance Range
• Low Inductance (50nH-100nH)
• High Power Density
Flexible packaging schemes make these resistors
ideal for power supplies, audio amplifiers, video fly-
back, and other power control applications.
• Easy to install. PC-mountable
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Series
TA203
TA303
Wattage
3.0
Series
TA205
TA305
TA605
TA805
Wattage
5.0
Series
TA207
TA307
Wattage
7.5
7.5
Series
TA310
TA810
Wattage
10.0
Series
TA025
TA050
TA100
Wattage
25.0
50.0
100.0
3.0
5.0
5.0
5.0
10.0
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Alumina
Substrate
Resistor
Coating
Thick Film
Glass
Solder Plated Phosphor Bronze
20 Watts/Meter/°C
Terminals
Thermal Conductivity
1 ohm:
450 ppm/°C
Temperature Coefficient
1 to 100Ω:
100 ppm/°C
101Ω and up: 50 ppm/°C
±1%, ±5% and ±10%
Tolerance
Power Rating
Based on 25°C free air
0.25 ohm to 10M ohm. Consult factory for other values
Resistance Range
350 VAC, 500 VDC through glass, 1000 VAC, 1500 VDC through substrate
Maximum Operating Voltage
Overload
Five times rated power, as long as the one second average dissipation does not exceed the wattage rat-
ing. ∆R: ±2%, 2000 hours
100% @ 25°C to 0% @ 180°C ambient.
Derating
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com