C&H Technology RTOP User Manual

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RTOP
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
1 % tolerance available
High power rating = 200 W
Wide ohmic value range = 0.046 to 1 MΩ
Non inductive
Easy mounting
Low thermal radiation of the case
Standard Isotop case (SOT 227 B)
This series of thick film power resistors include modules which can incorporate up to 2 different resistor values in the same SOT 227B package. Two types of terminations are available along with a 4 terminal device for measurement applications in the case of the single resistor version. This product range benefits from Vishay Sfernice’s experience in thick film power resistor technology i.e. high power: volume ratio, low tolerance or individual resistors and excellent overload capabilities (due to the trimming technique).
RoHS
COMPLIANT
DIMENSIONS in millimeters
RTOP
• Tolerances unless otherwise specified: ± 0.3 mm
MECHANICAL SPECIFICATIONS
Mechanical Protection Substrate
Alumina on insulated base
Resistive Element End Connections Tightening Torque Connections Tightening Torque Heatsink Weight
Insulated case
Cermet V connections: screw M4 x 6 1 Nm 2 Nm 30 g max.
V Connections
12.6 25
12.6
10
4
16
Ø 4.2
39
30
ELECTRICAL SPECIFICATIONS
Resistance Range 0.046 to 1 MΩ
Standard Tolerance ± 1 % to ± 10 %
Power Rating
50 W to 200 W
at + 25 °C
Temperature Coefficient
ENVIRONMENTAL SPECIFICATIONS
Temperature Range Climatic Category
www.vishay.com For technical questions, contact: sfer@vishay.com 1 Revision: 14-Nov-08
- 55 °C to + 125 °C 55/125/56
(- 55 °C to + 125 °C)
Insulation Resistance > 10
Standard
± 300 ppm/°C (R < 1) ± 150 ppm/°C (R > 1)
6
MΩ
Document Number: 50045
RTOP
Power Resistor for Mounting onto a Heatsink
Vishay Sfernice
Thick Film Technology
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
NF EN 140000 CEI 115_1
2.5 Pn/5 s U
NF EN 140000 CEI 68214 Test Na
5 cycles - 55 °C + 125 °C
NF EN 140000 CEI 115_1
Pn at 25 °C 1000 h
MIL STD 202 Method 103 B Test D
56 days 95 % R.H.
< 2 U
S
L
SPECIAL FEATURES
MODEL RTOP 200 RTOP 100 DRTOP 100 DRTOP 50
Power Rating at + 25 °C Chassis Mounted Resistors Unmounted Resistors
200 W
5 W
100 W
5 W
< ± (0.25 % + 0.05 Ω)
< ± (0.25 % + 0.05 Ω)
< ± (0.5 % + 0.05 Ω)
< ± (0.5 % + 0.05 Ω)
100 W
3.5 W
50 W
3.5 W
Thermal Resistance (Per Resistor) 0.5 °C/W 1 °C/W 0.5 °C/W 1 °C/W
Limiting Voltage U
Dielectric Strength Connections/Chassis
Dielectric Strength Connections/Resistors
Ohmic Value Range 0.046 to 1 MΩ 0.092 to 1 MΩ
Tolerance ± 1 % to ± 10 % ± 1 % to ± 10 %
Electrical Diagrams
1500 V 1500 V 500 V 500 V
L
(1)
(1)
2500 V, 1 min
10 mA max.
- -
2500 V, 1 min
10 mA max.
R
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
2500 V, 1 min
10 mA max.
R2
R1
R
Shunt Version
Note
(1)
MIL STD 202 Method 301
Document Number: 50045 For technical questions, contact: sfer@vishay.com Revision: 14-Nov-08 2
www.vishay.com
RTOP
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
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:
-------------------------------------------------------------
P
R
P: Expressed in W
ΔT: Difference between maximum working
temperature and room temperature.
R
: Thermal resistance value measured between
TH (j - c)
resistive layer and outer side of the resistor. It is the thermal resistance of the component (see Table Special Features).
R
: Thermal resistance value measured between
TH (c - a)
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.
Example:
R
TH (c - a)
: For RTOP 200 power rating 130 W at ambient
temperature + 30 °C.
Thermal resistance (see table 1) R
ΔT 125 °C - 30 °C - 95 °C≤≤
R
TH (j - c)RTH (c - a)
R
TH (j - c)
R
TH (c - a)
0.5 °C/W
0.73 °C/W - 0.5 °C/W 0.23 °C/W≤≤
ΔT
+[]
TH j c–()RTH c a()
ΔT
95
-------
----------
P
130
TH (j - c)
0.73 °C/W== =+
1()=
: 0.5 °C/W
OVERLOADS
The applied power is 2.5 x rated power for 5 s with a max. voltage of 2 x nominal voltage.
Accidental overload: The values indicated in the graph below are applicable to resistors in air or mounted onto a heatsink. In case of multi-resistor devices, (DRTOP, TROP and QROP) the results apply to each resistor value in the device.
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 heater must be around 6.3 µm.
In order to improve thermal conductivity, surfaces in contact (alumina, heatsink) are laid on with a silicone grease (type SI 340 from Rhône-Poulenc or Dow 340 from Dow Corning).
Tightening torque on heater: 2 Nm
For the electrical connections, it is recommended to use M4 x 6 screws and if necessary a washer of 1mm thickness. The recommended screw tightening torque is 1 Nm.
ENERGY CURVE
1000
100
10
1
ENERGY IN JOULES
0.1
0.01
1.10-7 1.10-6 1.10-5 1.10-4 1.10-3 1.10-2 1.10-1 1
OVERLOAD DURATION IN SECONDS
RTOP DRTOP
www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50045 3 Revision: 14-Nov-08
RTOP
Power Resistor for Mounting onto a Heatsink
Vishay Sfernice
Thick Film Technology
POWER RATING CHART
The temperature of the heater should be maintained in the limit specified. To improve the thermal conductivity, surfaces in contact should be laid on with a silicon grease and the torque applied on the screw for tightening should be around 2 Nm.
MARKING
Series, style, ohmic value (in), tolerance (in %), manufacturing date, VISHAY trade mark.
PACKAGING
Box of 10 units
100
80
60
40
% RATED POWER
20
0
0 20 40 60 80 100 120 140
HEATSINK TEMPERATURE IN DEGREES CELSIUS
ORDERING INFORMATION
RTOP 200 5U ± 1 % ± % V
DRTOP 50 150U 5 % 15U 5 % V XXX BO10 e
R1 T1 R2
MODEL STYLE OHMIC
RTOP
DRTOP
100
50
VAL UE
ABSOLUTE TOLERANCE PER
Optional
± 1 % ± 2 % ± 5 %
± 10 %
RESISTOR
To be precise
for each
resistor
CONNECTIONS CUSTOM
V: Screw
VS: RTOP Shunt
DESIGN
Optional
PACKAGING LEAD
(Pb)-FREE
GLOBAL PART NUMBER INFORMATION
OP1 0 0V 5 0 R KR TD R50B
GLOBAL
MODEL
RTOP
DRTOP
Document Number: 50045 For technical questions, contact: sfer@vishay.com Revision: 14-Nov-08 4
SIZE LEADS OHMIC VALUE OHMIC VALUE TOL. PACKAGING SPECIAL
100 200
F = Faston type
V = Screw
VS, FS =
RTOP Shunt
If RTOP: The first three digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point.
48R7 = 48.7 Ω 4871 = 4870 Ω
1002 = 10 000 Ω
R010 = 0.01 Ω R680 = 0.68 Ω
2700 = 2700 Ω = 2K7 Ω
Blank if RTOP. If DRTOP: The first two digits are significant figures and the last digit specifies the number of zeros to follow. R designates decimal point.
48R = 48 Ω
487 = 487 Ω
F = 1 %
G = 2 %
J = 5 %
K = 10 %
B = Box
10 pieces
As applicable
Ex = UA1
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Legal Disclaimer Notice
Vishay

Disclaimer

All product specifications and data are subject to change without notice.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 www.vishay.com Revision: 18-Jul-08 1
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