RTOP200VR470JB Vishay, RTOP200VR470JB Datasheet - Page 3

• Manufacturer Part Number: RTOP200VR470JB
• Description: THICK FILM RES, 0.47OHM, 200W, 5%
• Manufacturer: Vishay
• Type: Thick Filmr

Specifications of RTOP200VR470JB

• Resistance: 470mOhm
• Temperature Coefficient: ±300
• Power Rating(s): 200W
• Tolerance (+ Or -): 5%
• Mounting Style: Bolt-On
• Construction: Rectangular
• Package / Case: SOT-227B
• Operating Temp Range: -55C to 125C
• Case Style: Molded
• Termination Style: Screw Terminal
• Military Standard: Not Required
• Failure Rate: Not Required
• Product Length (mm): 38mm
• Product Height (mm): 12.6mm
• Product Depth (mm): 25mm
• Resistance Tolerance: ± 5%
• Power Rating: 5W
• Voltage Rating: 1.5kV
• Resistor Element Material: Thick Film
• Resistor Case Style: ISOTOP
• Lead Free Status / RoHS Status: Compliant

RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK
• Surfaces in contact must be carefully cleaned.
• The heatsink must have an acceptable flatness: From 0.05 mm to 0.1 mm/100 mm.
• Roughness of the heatsink must be around 6.3 µm. In order to improve thermal conductivity, surfaces in contact (alumina,
• For the electrical connections, it is recommended to use M4 x 6 screws and if necessary a washer of 1mm thickness. The
CHOICE OF THE HEATSINK
The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum
working temperature must not exceed 125 °C. The dissipated power is simply calculated by the following ratio:
Example:
R
Thermal resistance (see table 1) R
Document Number: 50045
Revision: 29-Jul-09
TH (c - a)
Tightening Torque on Heatsink
heatsink) should be coated with a silicone grease (type SI 340 from Rhône-Poulenc or Dow 340 from Dow Corning).
recommended screw tightening torque is 1 Nm.
P:
ΔT:
R
R
TH (j - c)
TH (c - a)
: For RTOP 200 power rating 130 W at ambient temperature + 30 °C.
:
:
Difference between maximum working temperature and room temperature.
Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal
resistance of the component (see Table Special Features).
Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal
resistance of the heatsink depending on the heatsink itself (type, shape) and the quality of the fastening device.
Expressed in W
ΔT
R
R
R
TH (j - c)
TH (j - c)
TH (c - a)
≤
125 °C - 30 °C -
+
≤
≤
R
0.5 °C/W
0.73 °C/W - 0.5 °C/W
TH (c - a)
Power Resistor for Mounting onto a Heatsink
=
TH (j - c)
≤
ΔT
-------
95 °C
P
=
: 0.5 °C/W
For technical questions, contact:
--------- -
130
95
=
≤
0.73 °C/W
0.23 °C/W
Thick Film Technology
P
=
-------------------------------------------------------------- -
[
R
TH (j - c)
]
ΔT
+
[
R
TH (c - a)
[e-mail]
]
RTOP
2 Nm
Vishay Sfernice
www.vishay.com
RTOP
53