LVR
Vishay Dale
Wirewound Resistors, Precision Power, Low Value,
Commercial, Military, MIL-PRF-49465 Type RLV, Axial Lead
FEATURES
• Ideal for all types of current sensing applications including
switching and linear power supplies, instruments and
power amplifiers
• Proprietary processing technique produces extremely low
resistance values
• Excellent load life stability
• Low temperature coefficient
• Low inductance
• Cooler operation for high power to size ratio
STANDARD ELECTRICAL SPECIFICATIONS
MODEL
MIL-PRF-49465
TYPE
LVR-1
LVR-3
LVR-3-26
LVR-5
LVR-5-26
LVR-10
—
—
RLV30
—
RLV31
—
POWER RATING
P
25
°
C
W
1
3
3
5
5
10
Ω
±
1%,
±
3%,
±
5%,
±
10%
0.01 - 0.1
0.005 - 0.2
0.01 - 0.2
0.005 - 0.3
0.01 - 0.3
0.01 - 0.8
RESISTANCE RANGE*
TECHNOLOGY
Metal Strip
Metal Strip
Metal Strip
Metal Strip
Metal Strip
Coil Spacewound
*Resistance is measured 3/8" [9.52mm] from the body of the resistor, or at 1.183" [30.05mm], 1.315" [33.40mm], 1.675" [42.545mm] or
2.575" [65.405mm] spacing for the LVR-1, LVR-3, LVR-5 and LVR-10 respectively.
TECHNICAL SPECIFICATIONS
PARAMETER
Rated Power at + 25°C
Operating Temperature Range
Dielectric Withstanding Voltage
Insulation Resistance
Short Time Overload
Terminal Strength (minimum)
Temperature Coefficient
Maximum Working Voltage
Weight (maximum)
UNIT
W
°C
V
AC
Ω
-
lb
ppm/°C
V
g
2
2
5
LVR-1
1
- 65/ + 175
1000
1000
LVR-3
3
LVR-5
5
- 65/ + 275
1000
1000
LVR-10
10
10,000 Megohms minimum dry
5 x rated power for 5 seconds
10
10
10 x rated power for 5 seconds
10
See TC vs Resistance Value Chart
(P x R)
1/2
5
11
ORDERING INFORMATION
LVR-3
MODEL
0.05
Ω
RESISTANCE
Ω
1.0%
TOLERANCE
±
%
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For technical questions, contact ww2aresistors@vishay.com
Document Number 30206
Revision 03-Oct-00
LVR
Wirewound Resistors, Precision Power, Low Value, Commercial, Military,
MIL-PRF-49465 Type RLV, Axial Lead
DIMENSIONS
1.50 [38.10]*
Minimum
Vishay Dale
MODEL
DIMENSIONS
in inches [millimeters]
A
±
0.010 [0.254]
LVR-1
LVR-3
0.427 [10.85]
0.560 [14.22]
0.925 [23.50]
1.828 [46.43]
A
±
0.010 [0.254]
0.115 [2.92]
0.205 [5.21]
0.330 [8.38]
0.392 [9.96]
B
±
0.002 [0.051]
0.020 [0.508]
0.032 [0.813]
0.040 [1.02]
0.040 [1.02]
C
C
B
LVR-5
LVR-10
*On some standard reel pack methods, the leads may be trimmed to
a shorter length than shown.
MATERIAL SPECIFICATIONS
SURFACE TEMPERATURE IN
°
C
250
LVR-3
LVR-1
LVR-5
Element:
Self-supporting nickel-chrome alloy
(LVR-10 also utilizes manganin)
Encapsulation:
High temperature mold compound
Terminals:
Tinned copper
Part Marking:
DALE, Model, Wattage, Value, Tolerance,
Date Code
The improved TC characteristics of these LVR models from
- 55°C to + 125°C (referenced to + 25°C) are as follows:
TC IN ppm/
°
C
400
LVR-3
LVR-10
300
LVR-1
200
LVR-10
150
100
50
1
2
3
4
5
6
7
Surface Temperature vs Power
RATED POWER IN %
120
100
8
9
10
POWER IN W
80
LVR-3
LVR-5
LVR-10
LVR-5
200
60
40
100
20
0
- 65
LVR-1
20
40
TC vs Resistance Value
60
80
100
RESISTANCE (
Ω
X 10
-3
)
- 25
25
75
125
175
225
275
Derating
AMBIENT TEMPERATURE IN
°
C
PERFORMANCE
TEST
Thermal Shock
Short Time Overload
Low Temperature Storage
High Temperature Exposure
Dielectric Withstanding Voltage
Insulation Resistance
Moisture Resistance
Shock, Specified Pulse
Vibration, High Frequency
Load Life
Solderability
Bias Humidity
CONDITIONS OF TEST (MIL-PRF-49465)
- 65°C to + 125°C, 5 cycles, 15 minutes at each extreme
5 x rated power (LVR-1, -3, -5), 10 x rated power (LVR-10) for 5 seconds
- 65°C for 24 hours
250 hours at + 275°C (+ 175°C for LVR-1)
1000V rms, one minute
MIL-STD-202 Method 302, 100 volts
MIL-STD-202 Method 106, 7b not applicable
MIL-STD-202 Method 213, 100g's for 6 milliseconds, 10 shocks
Frequency varied 10 to 2000Hz, 20g peak, 2 directions 6 hours each
2000 hours at rated power, + 25°C, 1.5 hours “ON”, 0.5 hours “OFF”
ANSI J-STD-002
+ 85°C, 85% RH, 10% bias, 1000 hours
TEST LIMITS
±
(0.2% + 0.0005Ω)∆R
±
(0.5% + 0.0005Ω)∆R
±
(0.2% + 0.0005Ω)∆R
±
(2.0% + 0.0005Ω)∆R
±
(0.1% + 0.0005Ω)∆R
1000 MΩ minimum
±
(0.2% + 0.0005Ω)∆R
±
(0.1% + 0.0005Ω)∆R
±
(0.1% + 0.0005Ω)∆R
±
(2.0% + 0.0005Ω)∆R
95% coverage
±
(1.0% + 0.0005Ω)∆R
Document Number 30206
Revision 03-Oct-00
For technical questions, contact ww2aresistors@vishay.com
www.vishay.com
119
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