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RCH50S22001JS06

P1-P3P4-P6
RCH
www.vishay.com
Vishay Sfernice
Revision: 01-Aug-13
1
Document Number: 50006
For technical questions, contact: sferfixedresistors@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
Power Resistor, for Mounting onto a Heatsink
Thick Film Technology
Manufactured in cermet thick film technology, these power
resistors exhibit remarkable characteristics and the series
includes 4 types ranging from 5 W to 50 W.
Designed to be mounted onto a heatsink, the resistors can
bear high short time overloads and 3 types of terminations
are available.
The resistors are non inductive and are particularly suitable
for high frequency operation and cut-out circuits.
FEATURES
• 5 W to 50 W
• High power rating
• High overload capabilities up to 2500 V
RMS
• Wide resistance range from 0.24 M to 1 M
• High thermal capacity up to 0.8 °C/W
• Easy mounting
• Reduced size and weight
• High insulation: 10
6
M
• Material categorization: For definitions of compliance
please see www.vishay.com/doc?99912
Note
• Tolerances unless stated: ± 0.3 mm
DIMENSIONS in millimeters
MODEL RCH5 RCH10 RCH25 RCH50
L 16.6 19 28 47.8
W 9 11 14 15.5
H 16.4 20.6 27.5 29.5
P Leads Pitch 10.2 12.7 18.3 30.5
F Connection Pitch 11.3 14.3 18.3 39.7
T 12.5 15.9 19.8 21.4
S 5.357.78
Ø D 2.4 2.4 3.2 3.2
Weight (g) 45712
Ø 2
6
RCH...R
M2
6
RCH...V
W
H
F
S
L
Ø D
P
6
4.8
6
3
Ø 2.1
T
9
RCH...S
RCH
www.vishay.com
Vishay Sfernice
Revision: 01-Aug-13
2
Document Number: 50006
For technical questions, contact: sferfixedresistors@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
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
RESISTANCE
RANGE
RATED POWER
P
25 °C
W
TOLERANCE
± %
TEMPERATURE
COEFFICIENT
± ppm/°C
SERIES
RCH 5 0.24 to 1M 5 1, 2, 5, 10 150, 250 E24 range
RCH 10 0.24 to 1M 10 1, 2, 5, 10 150, 250 E24 range
RCH 25 0.24 to 1M 25 1, 2, 5, 10 150, 250 E24 range
RCH 50 0.24 to 1M 50 1, 2, 5, 10 150, 250 E24 range
MECHANICAL SPECIFICATIONS
Mechanical Protection Insulated case
Resistive Element Cermet
Substrate Alumina
Connections Tinned copper alloy
ENVIRONMENTAL SPECIFICATIONS
Temperature Range - 55 °C to + 125 °C
Climatic Category 55/125/56
Flammability
IEC 60695-11-5
2 applications 30 s
separated by 60 s
TECHNICAL SPECIFICATIONS
Dissipation and Associated Onto a heatsink
Power Rating:
Chassis Mounted
Unmounted
5 W to 50 W
2 W to 5.5 W
Temperature Coefficient ± 150 ppm/°C
Insulation Resistance 10
6
M
Total Inductance 0.1 μH
PERFORMANCE
TESTS CONDITIONS REQUIREMENTS
Momentary Overload
NF EN140000 CEI 115_1
2 Pr/5 s
U
S
< 1.5 U
L
< ± (0.25 % + 0.05 )
Rapid Temperature Change
NF EN140000 125 °C CEI 68215 Test Na
5 cycles
- 55 °C to + 125 °C
< ± (0.25 % + 0.05 )
Load Life
NF EN140000 CEI 115_1
1000 h Pr at + 25 °C
< ± (0.5 % + 0.05 )
Humidity (Steady State)
56 days RH 95 %
MIL-STD-202 Method 103 B and C
< ± (0.5 % + 0.05 )
RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR
Resistance Values < 1 > 1
Standard Tolerances
± 5 %
± 10 %
Standard TCR ± 250 ppm/°C ± 150 ppm/°C
Tolerance on Request ± 1 % to ± 2 %
SPECIAL FEATURES
MODEL RCH 5 RCH 10 RCH 25 RCH 50
Power Rating-Chassis Mounted 5 W 10 W 25 W 50 W
Power Rating-Unmounted 2 W 2.5 W 4 W 5.5 W
Thermal Resistance R
th (j - c)
4.8 °C/W 3.2 °C/W 1.4 °C/W 0.8 °C/W
Limiting Element Voltage (V
RMS
) 160 V 250 V 550 V 1285 V
Max. Overload Voltage (V
RMS
) 320 V 500 V 1100 V 2500 V
Dielectric Strength (V
RMS
) 50 Hz, 1 min
MIL-STD-202 Method 301 10 mA max.
2000 V 2000 V 3500 V 3500 V
Critical Resistance 5120 6250 12 100 33 024
RCH
www.vishay.com
Vishay Sfernice
Revision: 01-Aug-13
3
Document Number: 50006
For technical questions, contact: sferfixedresistors@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
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,
heatsink) are coated with a silicone grease (type Sl 340 from Rhône-Poulenc or Dow 340 from Dow Corning).
• The fastening of the resistor to the heatsink is under pressure control of two screws (not supplied).
• In order to improve the dissipation, either forced-air cooling or liquid cooling may be used.
• A low thermal radiation of the case allows several resistors to be mounted onto the same heatsink.
• Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm).
• In any case the hot spot temperature, measured locally on the case must not exceed 125 °C.
• Tests should be performed by the user.
CHOICE OF THE HEATSINK
The user must choose 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: Expressed in W
T: Difference between maximum working temperature and room temperature or fluid cooling temperature.
R
th (j - c)
: Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal
resistance of the component.
R
th (c - h)
: Thermal resistance value measured between outer side of the resistor and upper side of the heatsink. This is the
thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device.
R
th (h - a)
: Thermal resistance of the heatsink.
Example:
R
TH (c - a)
for RCH 25 power rating 20 W at ambient temperature + 50 °C
Thermal resistance R
TH (j - c)
: 2.5 °C/W
Considering equation
(1)
we have:
T = 125 °C - 50 °C 75 °C
R
TH (j - c)
= 1.4 °C/W (Special Features)
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
= = = 3.75 °C/W
R
TH (c - h)
+ R
TH (h - a)
3.75 °C/W - 1.4 °C/W 2.35 °C/W
with a thermal grease R
TH (c - h)
= 1 °C/W, we need a heatsink with R
TH (h - a)
= 1.35 °C/W
Tightening Torque
on heatsink
RCH 5 RCH 10 RCH 25 RCH 50
0.5 Nm 0.6 Nm 0.7 Nm 1 Nm
P
T
R
TH (j - c)
R
TH (c - h)
R
TH (h - a)
++
-------------------------------------------------------------------------------------------
1
=
T
P
-------
75
20
-----
P1-P3P4-P6

RCH50S22001JS06

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Buy RCH50S22001JS06
Manufacturer:
Vishay
Description:
Planar Resistors - Chassis Mount 50W 22Kohm 5%
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