LPS 300
www.vishay.com
Vishay Sfernice
Power Resistor for Mounting onto a Heatsink
Thick Film Technology
FEATURES
• Compliant with requirement #26 of
NF-EN45545-2
• High power 300 W at 85 °C bottom case
temperature
• Wide resistance range: 0.3 Ω to 900 kΩ
E24 series
• Non inductive
• Easy mounting
LINKS TO ADDITIONAL RESOURCES
3D 3D
• Low thermal radiation of the case
• Material categorization: for definitions of compliance
please see www.vishay.com/doc?99912
3D Models
DIMENSIONS in millimeters
25.8 ± 1
LPS 300
6K8 5 %
V2
60
25.2
21.2
15.2
± 0.5
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
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
LPS 300
RESISTANCE
RANGE
Ω
0.3 to 900K
RATED POWER
P85 °C
W
300
LIMITING ELEMENT
VOLTAGE UL
V
5K
TOLERANCE
±%
1, 2, 5, 10
TEMPERATURE
COEFFICIENT
± ppm/°C
150, 300, 500
MECHANICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Flammability
Power Rating and
Thermal Resistance
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
ENVIRONMENTAL SPECIFICATIONS
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
Temperature Range
Climatic Category
Partial Discharge
(for LPS 300 D only)
Revision: 13-Apr-2021
2 Nm
2 Nm
2.5 Nm
83 g ± 10 %
-55 °C to 120 °C
55/120/56
CRITICAL
RESISTANCE
(Ω)
83.33K
300 W at + 85 °C
bottom case temperature
RTH (j - c): 0.112 °C/W
R ≤ 1 Ω: ± 500 ppm/°C
1 Ω < R ≤ 10 Ω: ± 300 ppm/°C
10 Ω < R: ± 150 ppm/°C
7 kVRMS or 12 kVRMS
Until 12 kV
≥ 104 MΩ
≤ 0.1 μH
≤ 100 pC/7 kV
≤ 10 pC/5 kV
Other cases: Consult us
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
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 30068-2-14 Test Na
50 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 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.
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 - h) + R TH (h - a)
P:
Expressed in W
ΔT:
Difference between maximum working temperature and room temperature
RTH (j - c):
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).
RTH (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.
RTH (h - a):
Thermal resistance of the heatsink.
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 - h) + RTH (h - a) = ------- = ------- = 0.388 °C/W
P
180
RTH (j - c) = 0.112 °C/W
RTH (c - h) + RTH (h - a) = 0.388 °C/W - 0.112 °C/W = 0.276 °C/W
Revision: 13-Apr-2021
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
Vishay Sfernice
OVERLOADS
MARKING
In any case the applied voltage must be lower than
UL = 5000 V.
Series, style, ohmic value (in Ω), tolerance (in %),
manufacturing date, Vishay Sfernice trademark.
Short time overload: 4 x Pr/10 s
Accidental overload: The values indicated on the following
graph are applicable to resistors in air or mounted onto a
heatsink.
ENERGY CURVE
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.
10 000
RATED DISSIPATION IN %
ENERGY IN J
1000
100
10
1
0.1
0.0001 0.001
0.01
0.1
1
10
100
1000
OVERLOAD DURATION IN ms
100
80
60
40
20
0
0
50
85
100
120
150
200
BOTTOM CASE TEMPERATURE IN °C
POWER CURVE
10 000
PACKAGING
Box of 15 units
POWER IN kW
1000
100
10
1
0.0001 0.001
0.01
0.1
1
10
100
1000
OVERLOAD DURATION IN ms
Revision: 13-Apr-2021
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
ORDERING INFORMATION
LPS
300
100 kΩ
±1%
xxx
BO15
e
MODEL
STYLE
RESISTANCE
VALUE
TOLERANCE
CUSTOM DESIGN
PACKAGING
LEAD (Pb)-FREE
±1%
±2%
±5%
± 10 %
Optional
on request:
special TCR,
shape etc.
GLOBAL PART NUMBER INFORMATION
L
P
GLOBAL
MODEL
LPS 300
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
D = partial discharge
≤ 100 pC/7 kV and
≤ 10 pC/5 kV
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
47R0 = 47 Ω
1001 = 1 kΩ
4R70 = 4.7 Ω
R240 = 0.24 Ω
F=1%
G=2%
J=5%
K = 10 %
B = box 15 pieces
As applicable
ZAx
Revision: 13-Apr-2021
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
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“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
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Revision: 01-Jan-2023
1
Document Number: 91000
