Ohmite TA1K, TA2K Data Sheet
TA1K & TA2K
100
Percent Rated Watts
Bottom of base plate Temperature, °C
60
20
0
150
80
40
25 100 12505085
High Wattage Heat Sinkable Planar Resistor
The TAP series delivers
1000W or 2000W of continuous power when properly
mounted to a liquid cooled
heat sink (based on 85°C
mounting plate temperature)
Applications include
power conditioning, power
distribution, power conversion, and power control.
FeATures
• High Energy Rating
• Low Inductance
• Resistor Element Electrically Isolated
• High Dielectric Strength
• Small Footprint
chArAcTerisTics
ApplicATions
• Power semiconductor balancing
• Motor control
• Inrush Current Limiting
Resistor Element
Power Rating
Resistance Values
Resistance Tolerance
Max Operating Voltage
Temperature Coefficient
Dielectric Strength
Operating Temperature
Terminal Screws
Max Contacts Torque
Mounting Screws
Max Mounting Torque
Creepage Distance
Derating
Range
Thick Film on Alumina
Substrate
1000W or 2000W at
85°C mounting plate
0.5Ω to 1000Ω
+10% std.
2000VDC
± 250 PPM/°C
6KV standard
-55°C to 85°C
#10-32
10 in-lb
#8-32
15 in-lb
50mm ± 1mm (min)
Test Continuous Pulse
Rated Power, max. current and heat sink plate
temperature limited
Operating Voltage
Max. Applied Voltage, ohms law limited
Max. Current
Critical Resistance; below this resistance max
power has to be de-rated due to exceeding max
current
Test Method Maximum ∆R
Short Time
Overload
Moisture
Resistance
Thermal Shock
Vibration, elec.
Vibration, mech.
Load Life
Pulse Tolerance
Dielectric
Strength
1.14 x √P*R / 10 sec @ 70°C Max % ∆Rsto =
(TA1K0) 1000 hrs @ 40°C, 90-95% RH
(TA2K0) 1750 hrs @ 40°C, 90-95% RH
MIL-STD-202, Method 107 MIL-STD-202,
MIL-STD-202, Method 201 ±2% Resistance
MIL-STD-202, Method 201 No Loose
(TA1K0) 1000 Hrs 90 min ON / 30 min OFF
(TA2K0) 1750 Hrs 90 min ON / 30 min OFF
52µF @ 2KV / 60 sec intervals, 104J,
20,000 Pulses
6KVDC for 1 minute ≤1%
(TA1K0) 1000W
(TA2K0) 2000W
√P*R N/A
223V 2000VDC
10A 53.33A
(TA1K0) 10Ω
(TA2K0) 20Ω
Rating
±(2% + 0.05Ω)
≤1%
≤1%
Method 107
Terminal Screws
≤1%
≤1%
≤1%
(continued)
TA 1K0PH2R50KE
Style Package
Type
Resistance
2.5Ω = 2R50
50Ω = 50R0
Tolerance
K = 10% (standard)
L = 20%
Wattage
RoHS Compliant
0.798"
(20.26mm)
3.000"
(76.20mm)
ø10-32
1.308"
(33.21mm)
0.193"
(4.89mm)
1.622"
(41.20mm)
0.689"
(17.50mm)
ø0.172"
(4.37mm)
0.450"
(11.43mm)
0.300"
(7.62mm)
0.188"
(4.76mm)
1.308"
(33.21mm)
(same dimensions)
TA1K & TA2K
High Wattage Heat Sinkable Planar Resistor
(in./mm)
dimensions
ordering inFormATion
ApplicATion noTes
Proper heat sinking techniques are essential to performance of
a TAP resistor. Pleased follow these guidelines when designing
TAP system:
• Heats sink plate (base plate of the resistor) temperature
must be monitored to establish proper de-rating. Best technique is to attach a thermocouple to the side of the base
plate of the resistor. Temperature of plastic housing or heat
sink cannot be used to establish rating of the resistor. Usage
of laser thermometers should be avoided.
• To obtain a power rating of 1000W or 2000W, the bottom
case temp must not exceed 85°C. This can only be achieved
if the thermal conduction to the heatsink Rth-cs<0.025°K/W.
This value can be reached by using thermal transfer com-
pound with a heat conductivity of 1W/mK. The flatness of
the cooling plate must be better than 0.05mm overall. The
roughness of the surface should not exceed 6.4µm.
• Due to very high power density, only liquid cooled heat sinks
are recommended for applications when >300W power rating
is desired.
• Properly designed heat sink should have more than 2 cooling
pipes under the surface of the TAP resistor. The Ohmite CP4
heat sink (https://www.ohmite.com/cp4-series-chillplate/) is
an example of properly designed heat sink.
Standard Part Numbers
Ohms 10% Tolerance
1000 Watt
0.5 TA1K0PHR500KE
1 TA1K0PH1R00KE
2.5 TA1K0PH2R50KE
5 TA1K0PH5R00KE
7.5 TA1K0PH7R50KE
10 TA1K0PH10R0KE
15 TA1K0PH15R0KE
25 TA1K0PH25R0KE
50 TA1K0PH50R0KE
100 TA1K0PH100RKE
250 TA1K0PH250RKE
500 TA1K0PH500RKE
750 TA1K0PH750RKE
1000 TA1K0PH1K00KE
Ohms 10% Tolerance
2000 Watt
0.5 TA2K0PHR500KE
1 TA2K0PH1R00KE
2.5 TA2K0PH2R50KE
5 TA2K0PH5R00KE
7.5 TA2K0PH7R50KE
10 TA2K0PH10R0KE
15 TA2K0PH15R0KE
25 TA2K0PH25R0KE
50 TA2K0PH50R0KE
100 TA2K0PH100RKE
250 TA2K0PH250RKE
500 TA2K0PH500RKE
750 TA2K0PH750RKE
1000 TA2K0PH1K00KE
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