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
Wattage
5.0
Series
TA207
TA307
Wattage
7.5
7.5
Series
TA310
TA810
Wattage
10.0
Series
Wattage
25.0
50.0
100.0
TA205
TA305
TA605
TA805
TA025
TA050
TA100
3.0
5.0
5.0
5.0
10.0
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Alumina
Substrate
Resistor
Coating
Test Condition
Test MILR83401
Specification
ΔR
±( 1.0% + 0.05Ω)
Thick Film
40°C, rated power, 90
min ON 30 min OFF,
1000 hrs.
Life (Rated
Glass
Power)
Solder Plated Phosphor Bronze
Terminals
1 ohm:
1 to 100Ω:
101Ω and up: 50 ppm/°C
±1%, ±5% and ±10%
Based on 25°C free air
450 ppm/°C
100 ppm/°C
Temperature Coefficient
60°C, 90 - 95% RH,
rated power, 90 min
ON 30 min OFF, 1000
hrs.
ΔR
Life
(Moisture
Load)
±( 1.0% + 0.05Ω)
Tolerance
Power Rating
Room temp > -55°C
30 min > RT 10 min ±
120°C 30 min > RT10
min 5 cycles
ΔR
Temperature
Cycling
±( 0.25% + 0.05Ω)
0.25 ohm to 10M ohm. Consult fac-
tory for other values
Resistance Range
350 VAC, 500 VDC through glass,
1000 VAC, 1500 VDC through sub-
strate, not to exceed power rating
Maximum Operating Voltage
Overload
UL94V-O rated (not recognized)
Flammability
350°C Solderpot, 3
secs.
ΔR
Soldering
Heat
±( 0.25% + 0.05Ω)
Five times rated power, as long as the
one second average dissipation does
not exceed the wattage rating. ∆R:
±2%, 2000 hours
DC 100V, 1 min
Over 1000M ohm
Insulation
Resistance
100% @ 25°C to 0% @ 180°C ambi-
ent.
Derating
1.0pf (100 MHz)
5000V thru back side
-55°C to +180°C
Equivalent Parallel Capacitance
Withstanding Voltage
Operating Temperature Range
Overload Current
(continued)
20 x rated current up to 8 ms (ΔR ±
0.5%)
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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