TC Series
®
This product has been
DISCONTINUED
PECOS Resistors
Thick Film on Porcelainized
Steel Substrate
C
PECOS
®
stands for Porcelain
Enamel Coating on Steel. It is
a plate resistor system utiliz-
ing thick film ruthenium oxide
on a porcelain coated steel
substrate. Copper plated silver
conductors are employed and
the resistive element is pro-
tected by a glass passivation
layer.
These resistors offer low
inductance (50nh @1MHz)
and very high power densities
(15W/in
2
). Being PC-board
mountable, they are economic
to install and best suited for
applications under 200V oper-
ating.
SPECIFICATIONS
Material
Substrate:
PECOS
®
(Porcelain
Enamel Coating on Steel)
Resistor:
Ruthenium Oxide
Coating:
Glass
Terminals:
Solder Plated
Phosphor Bronze, riveted in
place and electrically connected
with high temperature solder.
Thermal Conductivity:
60 Watts/
Meter/°C, x-y direction
Temperature Coefficient:
150 ppm/°C
≥
1Ω
Electrical
Ohmic Range:
1-2500Ω
Tolerance:
±1-5% to 20%
Power Rating:
Based on 25°C
free air
Maximum Operating Voltage:
200 VDC
Overload:
Five times rated power,
as long as the one second aver-
age dissipation does not exceed
the wattage rating.
∆R:
±2%, 2000 hours
0.28"/7.11mm
typical
A
E
B
D
0.41"/10.41mm
FEATURES
• 15W/in
2
Power Density
• Low Inductance
• Easy to Install
T
Terminal Detail:
0.2"/5.08mm
(0.1"/2.54mm
for 10 watt)
0.2"/5.08mm
0.04" diam. Pins
(corner pins can
be omitted at
customer request)
DERATING CURVE
Percent Rated Watts
Series
TC010PA
TC020PA
TC025PA
TC050PA
TC100PA
Watts
10
A
0.300 /
7.62
Dimensions (in. /
mm
)
B
C
D
0.55 /
13.97
100
E
80
60
40
20
0
25 50
100 150 200 250 300
Ambient Temperature,
°C
350
1.25 /
31.75
0.29 /
7.37
0.50 /
12.70
1.40 /
35.56
0.37 /
9.40
1.00 /
25.40
1.25 /
31.75
0.37 /
9.40
1.40 /
35.56
2.50 / 63.50 0.37 /
9.40
1.40 /
35.56
3.35 /
85.09
0.37 /
9.40
1.70 /
43.18
20 0.600 /
15.24
1.10 /
27.94
25 1.000 /
25.40
1.60 /
40.64
50 1.000 /
25.40
1.75 /
44.45
100 1.300 /
33.02
2.55/
64.77
O R D E R I N G I N F O R M AT I O N
E = RoHS compliant
Available Jan. 2006
½½½½½½½½½½½½½
Series
Power Rating
Package
PA = standard
Resistance (½)
5R00 = 5.0
50R0 = 50.0
Tolerance
J = 5%
K = 10%
L* = 20%
*20% Values are not laser trimmed and offer enhanced surge handling.
2
Ohmite Manufacturing Company
3601 Howard St., Skokie, IL 60076 • Tel. 847-675-2600 • Fax 847-675-1505 • www.ohmite.com • info@ohmite.com
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