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MCW 0406 AT - Precision
www.vishay.com
Vishay Beyschlag
APPLICATION INFORMATION
The power dissipation on the resistor generates a temperature rise against the local ambient, depending on the heat flow
support of the printed-circuit board (thermal resistance). The rated dissipation applies only if the permitted film temperature is
not exceeded. Furthermore, a high level of ambient temperature or of power dissipation may raise the temperature of the solder
joint, hence special solder alloys or board materials may be required to maintain the reliability of the assembly.
These resistors do not feature a lifetime limitation when operated within the limits of rated dissipation, permissible operating
voltage and permissible film temperature. However, the resistance typically increases due to the resistor’s film temperature over
operating time, generally known as drift. The drift may exceed the stability requirements of an individual application circuit and
thereby limits the functional lifetime. The designer may estimate the performance of the particular resistor application or set
certain load and temperature limits in order to maintain a desired stability.
MAXIMUM RESISTANCE CHANGE AT RATED DISSIPATION
OPERATION MODE
Rated dissipation
MCW 0406 AT
Applied maximum film temperature, ? F max.
Max. resistance change at rated dissipation for
resistance range:
MCW 0406 AT
?? R/R ? max. , after:
1000 h
8000 h
225 000 h
STANDARD
P 70
0.200 W
125 °C
1 ? to 100 k ?
? 0.1 %
? 0.2 %
? 0.6 %
POWER
P 70
0.250 W
155 °C
1 ? to 100 k ?
? 0.2 %
? 0.4 %
-
The resistance value is influenced by the resistance of the terminations. The exact resistance value of the soldered part on the
PCB may deviate depending on e.g. solder quantity, pad layout, and soldering method. The resistance value of the unmounted
part can be verified for resistors < 10 ? by a 4-point probe on the top side termination as shown below.
600 μm
870 μm
Fig. 1
Revision: 29-Jan-14
2
Document Number: 28847
For technical questions, contact: thinfilmchip@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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