RES-TA Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – High Power Density

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.
Flexible packaging schemes make these resistors
ideal for power supplies, audio amplifiers, video fly-
back, and other power control applications.
F e at u r e s
• High-Temp Terminal Construction
• Wide Resistance Range
• Low Inductance (50nH-100nH)
• High Power Density
• Easy to install. PC-mountable
Series
TA203
TA303
Wattage
3.0
3.0
Series
TA205
TA305
TA605
TA805
S ERIE S S P ECI F IC A T I O N S
Wattage
5.0
5.0
5.0
5.0
Series
TA207
TA307
Wattage
7.5
7.5
Series
TA310
TA810
Wattage
10.0
10.0
Series
TA025
TA050
TA100
Wattage
25.0
50.0
100.0
c h a r a c t e r i st i c s
Substrate Alumina
Resistor Thick Film
Coating Glass
Terminals Solder Plated Phosphor Bronze
Temperature Coefficient 1 ohm:
450 ppm/°C
1 to 100Ω: 100 ppm/°C
101Ω and up: 50 ppm/°C
Tolerance ±1%, ±5% and ±10%
Power Rating Based on 25°C free air
Resistance Range 0.25 ohm to 10M ohm. Consult fac-
tory for other values
Maximum Operating Voltage 350 VAC, 500 VDC through glass,
1000 VAC, 1500 VDC through sub-
strate, not to exceed power rating
Overload Five times rated power, as long as the
one second average dissipation does
not exceed the wattage rating. ∆R:
±2%, 2000 hours
Test Condition
Test MILR83401
Specification
Life (Rated 40°C, rated power, 90
Power) min ON 30 min OFF,
1000 hrs.
ΔR
±( 1.0% + 0.05Ω)
Life 60°C, 90 - 95% RH,
(Moisture rated power, 90 min
Load) ON 30 min OFF, 1000
hrs.
ΔR
±( 1.0% + 0.05Ω)
Temperature Room temp > -55°C
Cycling 30 min > RT 10 min ±
120°C 30 min > RT10
min 5 cycles
ΔR
±( 0.25% + 0.05Ω)
Flammability UL94V-O rated (not recognized)
Soldering 350°C Solderpot, 3
Heat secs.
ΔR
±( 0.25% + 0.05Ω)
Insulation DC 100V, 1 min
Resistance
Over 1000M ohm
Derating 100% @ 25°C to 0% @ 180°C ambi-
ent.
Equivalent Parallel Capacitance 1.0pf (100 MHz)
Withstanding Voltage 5000V thru back side
Operating Temperature Range -55°C to +180°C
Overload Current 20 x rated current up to 8 ms (ΔR ±
0.5%)
(continued)
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