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  Datasheet File OCR Text:
 Precision Resistor Type PBH
Spec Sheet R371-1/2 July 97
Technical Data
Resistance range Tolerances Temperature coefficient ( R > 20 mOhm ) Applicable temperature range Load capacity Thermal resistance to aluminum base plate Thermal resistance to ambiente Dielectric withstanding voltage Inductance ( R = 100 mOhm ) Stability ( nominal load at 70 C )
Remarks:
2 mOhm - 100 Ohm 1 %, 5 % < 50 ppm/K ( 20 C to 60 C ) -55 C to +125 C 3 W / 10 W with heatsink provided Rth < 4 K/W Rth < 20 K/W 500 V AC < 20 nH deviation < 0.5 % after 2,000 h
- Standard resistance values according to E12 with the additionel values of 2 and 5 - Minimum quantity of other values on request - Tolerance 0.5% for values of 10 mOhm up
The Resistor type PBH, which is very similar to type TO 247 for high power transistors, features small dimensions complemented with high load capacity and compatibility with active components. The use of the precision resistance material MANGANIN as well as optimization of conductor leads and resistance structure result in a low temperature coefficient, a longterm stability and low inductance. The resistor is mounted through a center bore to the heatsink, whereby the large area of the base plate will function as an optimum heat transfer.The thermal resistance between resistor layer and aluminum base plate is rated below 4 K/W, so that the temperature of the resistor foil
P / P Nenn 1 0.75 0.5 0.25
will rise only little at a nominal load of 10 W, compared with customary resistors. This again results that the absolute resistance deviation caused by the temperature coefficient, is very low under load and will serve for a good stability on overloading. The resistor is ideally suited for applications in power electronic and control technique, as most applications at inductive loading will require operation with switched power regulating units. Short connection distances and small dimensions with high loading capacity and low inductance are a prerequisite for obtaining high switching frequencies.
R/R20 [%]
0.2 -40 -20 20 40 60 80 100 120
T [oC]
-0.2
-0.4
0
20
40
60
80
100
120 TG / [oC]
Temperature dependence of the electrical resistance of ISA-PLAN Resistors
power derating curve
dR/R [%]
2
5 m 10 m
1 -40 -20 20 -1 -2 40
20 m
60
80
100
120
100 m
>200 m
T [oC]
dimensions ( mm )
Change of the R(T)-curve to the TCR of copper terminals for very low ohmic 2-terminal-resistors
Spec Sheet R371-2/2July 97
ordering example: PBH - R100 - F1 - 1 type PBH resistance value 100 mOhm terminal F1 tolerance 1%
( Technical modifications reserved )
RHOPOINT COMPONENTS LTD
Tel: +44/01883 717988, Fax: +44/01883 712938, Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com


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