Vishay
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    • RS Stock No. 684-2825
    • Brand Vishay
    • Mfr. Part No. LPS0300H4700JB
    • RoHS Status
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    Specifications
    Maximum Operating Temperature+120°C
    Maximum Temperature Coefficient+150ppm/°C
    Minimum Operating Temperature-55°C
    Minimum Temperature Coefficient-150ppm/°C
    Power Rating300W
    Resistance470Ω
    SeriesLPS300
    TechnologyThick Film
    Temperature Coefficient±150ppm/°C
    Termination StyleScrew
    Tolerance±5%
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    300 Watt LPS300 Series

    Power at 85°C 300 W  
    Resistance Tolerance 5 %  
    Temperature Coefficient 1U < R ≤ 10U 300ppm/°C
      10U < R 150ppm/°C
    Operating Temperature -50 → 120 °C  
    Thermal Resistance 0.112 °C/W  
    Limiting Element Voltage 5 kV  
    Insulating Resistance ≥ 104  
    Inductance ≤ 0.1 μH  
    Dimensions 60 x 57 x 25.2 mm  

    Non-Inductive - Panel Mount

    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
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