800 Watt CHF190104xBF Series - RF Flanged Chip Termination
DC to 1 GHz
Flanged model
Low VSWR
Non-Inductive - Heatsink Mountable
Virtually non-inductive, thick film power resistors designed for direct heatsink attachment and ideal for installation where easy connection in a limited space is required.
A specially formulated cermet film is deposited onto a high purity alumina substrate and housed in a hard epoxy moulding into which the terminals are integrated.
Values of 1Ω and below have 4 terminals to permit voltage sensing; all other values have 2 terminals
Applications include circuits where low inductance, high frequencies and pulse overloads are key parameters.
Application note:
derate linearly from full power at 25°C for 25 and 50W types and 70°C for 100 and 250W types to zero at 125°C. For best heat transfer it is suggested that a heat compound is applied between the alumina bottom surface and the heatsink chassis/surface.
Key Characteristics
Overload duration
RCH25
RCH50
BDS100
BDS250
1 sec.
375W
750W
200W
1500W
2 sec.
300W
600W
150W
1250W
5 sec.
125W
250W
125W
1000W
10 sec.
75W
150W
100W
750W
For each degree the ambient temperature is raised above 25°C, there is a reduction by 1% of the permitted overload.
The key characteristics table is only applicable to resistors suitably mounted on a heatsink with a thermal resistance of 1°C/W for 25 and 50W ratings, 0.7°C/W for 100W and 0.28°C/W for 250W ratings.
This data is only valid when thermal grease is used and the resistor is correctly tightened by mounting screws.
Tightening Torque
RCH25
RCH50
BDS100
BDS250
0.7Nm
1Nm
2Nm
2Nm
Dimensions
Sfernice series
RCH 5
RCH 10
RCH 25
RCH 50
L
16.6
19
28
50
W
9
11
14
15.5
H
16.4
20.6
27.5
29.4
P
10.2
12.7
18.3
33
F
11.3
14.3
18.3
39.7
T
12.5
15.9
19.8
21.4
S
5.3
5
7.7
8
ØD
2.4
2.4
3.2
3.2
M2
M2
M3
M3