PFS35
Power SMD Film Resistors
Power Derating
Power Rating Notes -
% Power
The PFS35 Series Resistors must be attached to a suitable
heatsink. The maximum internal resistor temperature is 175°C.
To specify an appropriate heatsink use the following formula :
+25 °C
100
80
60
40
20
0
TMAX - (P * RHR) - TA
RHH =
P
Where: RqH = Thermal Resistance of Heatsink ( K/W )
RqR = Thermal Resistance of Resistor ( K/W )
TMAX = Maximum Temperature of Resistor
TA = Ambient Temperature of Heatsink ( °C )
P = Power Through Resistor ( W )
+175 °C
150 200
-50
0
50
100
Flange Temperature (C)
DIMENSIONS
Back plate is isolated from both pins.
tol.
tol.
Pulse peak power (W)
Dimension
mm
10.3
10.1
15.3
5.08
1.5
(±mm) inches (±inches)
100k
10k
1k
A
B
C
D
E
F
G
H
J
0.2
0.2
0.405
0.400
0.602
0.200
0.060
0.030
0.087
0.177
0.020
0.10
0.008
0.008
0.047
0.004
0.002
0.002
0.008
0.008
0.002
0.02
1.2
0.1
0.05
0.05
0.2
400W
100
0.75
2.2
35W
1
10
4.5
0.2
10n 100n 1u
10u 100u 1m 10m 100m
Pulse width (seconds)
10
100
0.5
0.05
0.5
K
L
2.5
Tenative continuous-pulse allowance at duty 0.01. Load life test will be necessary
in actual equipment, because curve may be changed by resistance, repetition, duty
and perating temperature.
5.0
1.0
0.20
0.04
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
(626) 284-9901
(626) 284-1704
Revised: 201908_004
© Riedon, Inc.
www.riedon.com
sales@riedon.com