Vishay LPS0300LR240FB Power resistor for mounting onto a heatsink thick film technology Datasheet

LPS 300
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• 300 W at 85 °C bottom case temperature
• Wide resistance range: 0.3 Ω to 900 kΩ
E24 series
• Non inductive
• Easy mounting
• Low thermal radiation of the case
• Compliant to RoHS directive 2002/95/EC
DIMENSIONS in millimeters
25.8 ± 1
LPS 300
6K8 5 %
V2
60
25.2
21.2
15.2
36
64.7
2 x M4 useful depth: 8
2 x Ø 4.2
Ø 20
13.6
34
57
Note
• Tolerances unless stated: ± 0.2 mm
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Substrate
End Connections
Tightening Torque
- On Connections
- On Heatsink
Maximum Torque
Weight
Insulated case UL 94 V-0
Thick film
Alumina
Screws M4
2 Nm
2 Nm
2.5 Nm
83 g ± 10 %
ELECTRICAL SPECIFICATIONS
Resistance Range
0.3 Ω to 900 kΩ
Tolerances (Standard)
± 1 % to ± 10 %
Power Rating and
Thermal Resistance
Temperature Coefficient
- 55 °C/120 °C
IEC 60115-1
Standard
Limiting Element Voltage UL
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Document Number: 50052
Revision: 09-Jun-10
- 55 °C to 120 °C
55/120/56
Dielectric Strength
IEC 60115-1, 1 min,
10 mA max.
300 W at + 85 °C
bottom case temperature
RTH (j - c): 0.112 °C/W
R ≤ 1 U: ± 500 ppm/°C
1 U < R ≤ 10 U: ± 300 ppm/°C
10 U < R: ± 150 ppm/°C
5 kV
7 kVRMS or 12 kVRMS
Insulation Resistance
≥ 104 MΩ
Inductance
≤ 0.1 µH
Critical Resistance
83.33 kΩ
For technical questions, contact: [email protected]
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LPS 300
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
Vishay Sfernice
PERFORMANCE
TESTS
CONDITIONS
REQUIREMENTS
IEC 60115-1
4 x Pr/10 s
Umax. ≤ UL = 5000 V
± (0.25 % + 0.05 Ω)
IEC 60115-1/IEC 60068-2-14 Test Na
5 cycles
- 55 °C to + 120 °C
± (0.5 % + 0.05 Ω)
IEC 60115-1
1000 h (90/30) Pr at 85 °C
± (0.5 % + 0.05 Ω)
IEC 60115-1
56 days RH 95 %/40 °C
± (0.5 % + 0.05 Ω)
MIL STD 202 Method 204 Cond. D
(10 g; 5/500 Hz)
± (0.25 % + 0.05 Ω)
IEC 60115-1
(55/120/56)
± (1 % + 0.05 Ω)
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
Vibration
Climatic Sequence
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) should be coated with a silicone grease (type SI 340 from Rhône-Poulenc or Dow 340 from Dow Corning) or a thermal
film (type Q Pad II) easier and faster to install than the grease.
• The fastening of the resistor to the heatsink is under pressure control of two screws tightened at 2 Nm for full power availability.
LPS 300
Tightening Torque on Heatsink
2 Nm
• The following accessories are supplied with each product: 2 screws CHC M4 x 25 class 8.8 and 2 M4 contact lock washers for
heatsink mounting,
2 screws TH M4 x 6/6 and 2 M4 contact lock washers for
connections. 2 off CHC M4 x 16/16 class 8.
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 120 °C. The dissipated power is simply calculated by the following ratio:
ΔT
P = --------------------------------------------------------[ R TH (j - c) + R TH (c - a) ]
P:
ΔT:
RTH (j - c):
RTH (c - a):
Expressed in W
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 specifications environmental paragraph).
Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal
resistance of the thermal interface, the heatsink (type, shape) and the quality of the fastening device.
Example:
RTH (c - a) for LPS 300 power dissipation 180 W at + 50 °C room temperature.
ΔT ≤ 120 °C - 50 °C = 70 °C
ΔT
70
RTH (j - c) + RTH (c - a) = ------- = ---------- = 0.388 °C/W
P
180
RTH (j - c) = 0.112 °C/W
RTH (c - a) = 0.388 °C/W - 0.112 °C/W = 0.276 °C/W
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For technical questions, contact: [email protected]
Document Number: 50052
Revision: 09-Jun-10
LPS 300
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
Vishay Sfernice
OVERLOADS
POWER RATING
In any case the applied voltage must be lower than UL = 5000 V.
Short time overload: 4 x Pn/10 s
Accidental overload: The values indicated on the following
graph are applicable to resistors in air or mounted onto a
heatsink.
The temperature of the case should be maintained within the
limits specified in the following figure.
To optimize the thermal conduction, contacting surfaces
should be coated with silicone grease or thermal film, and
heatsink mounting screws tightened to 2 Nm.
ENERGY CURVE
RATED DISSIPATION IN %
10 000
ENERGY IN J
1000
100
10
1
0.1
10-6
100
80
60
40
20
0
10-5
10-4
10-3
10-2
10-1
1
0
50
85
100
120
150
200
BOTTOM CASE TEMPERATURE IN °C
OVERLOAD DURATION IN s
MARKING
PACKAGING
Series, style, ohmic value (in Ω), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
Box of 15 units
ORDERING INFORMATION
LPS
300
100 kΩ
±1%
xxx
BO15
e
MODEL
STYLE
RESISTANCE
VALUE
TOLERANCE
CUSTOM
DESIGN
Optional
on request:
Special TCR,
shape etc.
PACKAGING
LEAD (Pb)-FREE
±1%
±2%
±5%
± 10 %
GLOBAL PART NUMBER INFORMATION
L
GLOBAL
MODEL
LPS 300
P
S
0
3
0
0
H
4
7
R
0
J
B
DIELECTRIC
OHMIC VALUE
TOLERANCE
PACKAGING
SPECIAL
L = Dielectric
strength 7 kV
H = Dielectric
strength 12 kV
The first three digits are
significant figures and the
last digit specifies the
number of zeros to follow. R
designates decimal point.
F=1%
G=2%
J=5%
K = 10 %
B = Box 15 pieces
N = Box 15 pieces N/A
(1 to 14 pieces by box)
As applicable
ZAx
48R7 = 48.7 Ω
47R0 = 47 Ω
1001 = 1 kΩ
4R70 = 4.7 Ω
R240 = 0.24 Ω
Document Number: 50052
Revision: 09-Jun-10
For technical questions, contact: [email protected]
www.vishay.com
63
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
Revision: 18-Jul-08
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