LPS 300
www.vishay.com
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• High power 300 W at 85 °C bottom case
temperature
• Wide resistance range: 0.3
to 900 k
E24 series
• Non inductive
• Easy mounting
• Low thermal radiation of the case
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
DESIGN SUPPORT TOOLS
Models
Available
click logo to get started
DIMENSIONS
in millimeters
25.8 ± 1
60
36
LPS 300
6K8 5 %
V2
25.2
21.2
15.2
± 0.5
64.7
2 x Ø 4.2
34
57
2 x M4 useful depth: 8
Ø 20
13.6
Note
• Tolerances unless stated: ± 0.2 mm
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
LPS 300
RESISTANCE
RANGE
0.3 to 900K
RATED POWER
P
85 °C
W
300
LIMITING ELEMENT
VOLTAGE U
L
V
5K
TOLERANCE
±%
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
150, 300, 500
CRITICAL
RESISTANCE
()
83.33K
MECHANICAL SPECIFICATIONS
Mechanical Protection
Resistive Element
Substrate
End Connections
Tightening Torque
Connections
Tightening Torque 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 %
TECHNICAL SPECIFICATIONS
Power Rating and
Thermal Resistance
Temperature Coefficient
-55 °C / 120 °C
Standard
IEC 60115-1
Dielectric Strength
IEC 60115-1, 1 min,
10 mA max.
Lightning test 1.2/50 μs
IEC 61000-4-5
Insulation Resistance
Inductance
Partial Discharge
(for LPS 300 D only)
300 W at + 85 °C
bottom case temperature
R
TH (j - c)
: 0.112 °C/W
R
1
:
± 500 ppm/°C
1
<
R
10
:
± 300 ppm/°C
10
<
R:
± 150 ppm/°C
7 kV
RMS
or 12 kV
RMS
Until 12 kV
10
4
M
0.1 μH
100 pC/7 kV
10 pC/5 kV
Other cases: Consult us
ENVIRONMENTAL SPECIFICATIONS
Temperature Range
Climatic Category
Revision: 06-Mar-18
-55 °C to 120 °C
55/120/56
Document Number: 50052
1
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
LPS 300
www.vishay.com
Vishay Sfernice
CONDITIONS
IEC 60115-1
4 x P
r
/10 s
U
max.
U
L
= 5000 V
IEC 60115-1/IEC 30068-2-14 Test Na
50 cycles
-55 °C to +120 °C
IEC 60115-1
1000 h (90/30) P
r
at 85 °C
IEC 60115-1
56 days RH 95 %/40 °C
MIL STD 202 method 204 cond. D
(10
g;
5/500 Hz)
IEC 60115-1
(55 / 120 / 56)
REQUIREMENTS
± (0.25 % + 0.05
)
PERFORMANCE
TESTS
Momentary Overload
Rapid Temperature Change
Load Life
Humidity (Steady State)
Vibration
Climatic Sequence
± (0.5 % + 0.05
)
± (0.5 % + 0.05
)
± (0.5 % + 0.05
)
± (0.25 % + 0.05
)
± (1 % + 0.05
)
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 Bluesil Past 340 from BlueStar Silicones) 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.
Tightening Torque on Heatsink
LPS 300
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:
T
P =
-------------------------------------------------------------------------------------------
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
P:
T:
R
TH (j - c)
:
R
TH (c - h)
:
R
TH (h - a)
:
Example:
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 upper side of the heatsink.
This is the thermal resistance of the interface (grease, thermal pad), and the quality of the fastening device.
Thermal resistance of the heatsink.
R
TH (c - a)
for LPS 300 power dissipation 180 W at + 50 °C room temperature.
T
120 °C - 50 °C = 70 °C
R
TH (j - c)
= 0.112 °C/W
R
TH (c - h)
+ R
TH (h - a)
= 0.388 °C/W - 0.112 °C/W = 0.276 °C/W
R
TH (j - c)
+ R
TH (c - h)
+ R
TH (h - a)
=
------
=
-------
= 0.388 °C/W
-
-
T
P
70
180
Revision: 06-Mar-18
Document Number: 50052
2
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
LPS 300
www.vishay.com
OVERLOADS
In any case the applied voltage must be lower than
U
L
= 5000 V.
Short time overload:
4 x P
r
/10 s
Accidental overload:
The values indicated on the following
graph are applicable to resistors in air or mounted onto a
heatsink.
Vishay Sfernice
MARKING
Series, style, ohmic value (in
),
tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
POWER RATING
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
10 000
RATED DISSIPATION IN %
0.01
0.1
1
10
100
1000
1000
100
80
60
40
20
0
ENERGY IN J
100
10
1
0.1
0.0001 0.001
OVERLOAD DURATION IN ms
0
50
85
100
120
150
200
BOTTOM CASE TEMPERATURE IN °C
POWER CURVE
10 000
PACKAGING
Box of 15 units
1000
POWER IN kW
100
10
1
0.0001 0.001
0.01
0.1
1
10
100
1000
OVERLOAD DURATION IN ms
Revision: 06-Mar-18
Document Number: 50052
3
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
LPS 300
www.vishay.com
Vishay Sfernice
100 k
RESISTANCE
VALUE
±1%
TOLERANCE
±1%
±2%
±5%
± 10 %
xxx
CUSTOM DESIGN
Optional
on request:
special TCR,
shape etc.
BO15
PACKAGING
e
LEAD (Pb)-FREE
ORDERING INFORMATION
LPS
MODEL
300
STYLE
GLOBAL PART NUMBER INFORMATION
L
P
S
0
3
0
0
H
4
7
R
0
J
B
GLOBAL
MODEL
LPS 300
DIELECTRIC
L
= dielectric
strength 7 kV
H
= dielectric
strength 12 kV
D
= partial discharge
100 pC/7 kV and
10 pC/5 kV
OHMIC VALUE
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
47R0
= 47
1001
= 1 k
4R70
= 4.7
R240
= 0.24
TOLERANCE
F
=1%
G
=2%
J
=5%
K
= 10 %
PACKAGING
B
= box 15 pieces
SPECIAL
As applicable
ZAx
Revision: 06-Mar-18
Document Number: 50052
4
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
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
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 in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
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. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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