CFH350A56RJ 데이터 시트보기 (PDF) - TE Connectivity
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CFH350A56RJ Datasheet PDF : 4 Pages
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Aluminium Housed Power Resistors
Type CFH Series
Application Notes (continued)
Resistance Range. The resistance range fulfils almost all the use of power resistors, but in cases of
special requirements, lower or higher resistance values are available on request as well as closer
tolerances.
Inductance. The inductance changes with the resistance value and is not very influenced from frequency.
On request the CFH resistors are available with non inductive windings (Airton-Perry’s system) and are
identified by adding the letter N after the CFH identification (e.g.CFHN500). The inductance of the CFHN
resistors is less then 1 µH.
Parasitic Capacity. Parasitic capacity does not depend on the resistance value, but it changes with
frequency. The supplied value are just referred to 1 kHz (the higher) and 100 kHz. During normal load
conditions the effects of parasitic capacity are negligible. However in the presence of transients of high
voltage <10µsec, the housing may be a source of interference for most sensitive electronic
circuits. For a correct grounding of the housing, CFH resistors are available, on request, with a threaded
hole M5.
Limiting Element Voltage. This is the maximum voltage, which should not be exceeded during the
application conditions. The rated values are rather elevated, but special designs with higher limiting
element voltage are available for particular requirements.
The limiting element voltage of non inductive resistors is lower than the standard resistors
(Please contact us for advice).
Insulation resistance and dielectric strength. After a long load time, the insulation resistance of CFH
resistors keeps elevated as the employed insulating material does not get damaged despite the high
thermal conditions.
Thermal time constant. The dimension of the resistor models is proportional to power rating and weight,
therefore their behaviour during the rise of temperature, when the rated power is applied, is analogous.
Of course the application of a heat sinks or the mounting of the resistor on a surface, will modify the
thermal time constant which is peculiar for each application.
Thermal Time Constant Kt
Kt
390
350
300
250
200
150
100
Rated Power
2
/3 Rated Power
1/2 Rated Power
5
10
15
20
25
30
35
40
45
Time (mins)
Literature No. 1773318
Issued: 09-08
Dimensions are shown for
reference purposes only.
Dimensions are in
millimetres unless
otherwise specified.
Specifications subject to
change.
tycoelectronics.com
passives.tycoelectronics.com
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