Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal
®
Foil Technology
Rapid
ΔR
Stabilization - Low WCR - Low TCR
VHP4Z
VFP4Z
VCS331Z
VPR247Z
VCS332Z
Product may not be to scale
Rapid
ΔR
stabilization under transient loads, low wattage
coefficient (WCR), and low temperature coefficient (TCR)
are features of this new Z Based Bulk Metal
®
Foil series of
Current Sense Resistors.
The series should be selected where rapid .R stabilization
and resistance stability under transient power conditions is
required. These products achieve optimum performance
when mounted on a chassis or cooled heat sink. The Z
Based Technology provides extremely low WCR under
defined conditions (see Figure 1 and Figure 2). The low
absolute TCR provided by the Z Based Technology is
measured over the temperature range of - 55 °C to + 125 °C,
+ 25 °C reference (see Figure 3).
All of these devices utilizing the Z Based Technology are
provided with a true 4 terminal Kelvin connection. This is a
must for current sensing when the R-value is less than
100
Ω.
The VHP4Z and VPR247Z types add the additional
benefit of hermeticity. The welded construction and nitrogen
backfill provide maximum protection against environmental
stresses and insures long term stability. Typical applications
for this new series includes electron beam circuitry, electron
microscopes, fire control radar display systems, high speed
video display, deflection amplifier circuits, constant current
power supplies and forced balance electronic scales.
Custom high power designs can be developed for your
specific applications.
SALES
FEATURES
•
Rapid
ΔR
Stabilization under transient loads (see Figure 1)
•
Tenfold improvement of Wattage Coefficient of Resistance
(WCR): 4 ppm/W (see Figure 2)
•
Low Temperature Coefficient of Resistance:
(see Figure 3 and Table 2)
•
Thermal Resistance: 6 °C/W
•
Power Rating: 10 watts on heat sink
1)
at + 25 °C
(see Table 2)
3 watts in free air at + 25 °C (see Table 2)
•
Load Life Stability:
± 0.05 % Max
ΔR,
10 W on heat sink at + 25 °C, 2000 hours
± 0.01 % Max
ΔR,
3 W on heat sink at + 25 °C, 2000 hours
± 0.05 % Max
ΔR,
3 W in free air at + 25 °C, 2000 hours
•
Current Noise: < 0.01 µV(RMS)/volt of applied voltage
•
Thermal EMF: 0.1 µV/°C maximum, 0.05 µV/°C typical
•
Non-Inductive design
NOTE:
1.Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK)
• ASIA/JAPAN: foilsales.asia@vishay.com
• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• AMERICAS: foilsales.usa@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
www.vishay.com
1
For technical questions, contact: foil@vishay.com
Document Number: 63086
Revision: 02-Mar-05
Power Current Sense Resistors
Z-Based Bulk Metal
®
Foil Technology
Vishay Foil Resistors
Rapid
ΔR
Stabilization - Low WCR - Low TCR
FIGURE 1 - RAPID STABILIZATION
RESISTANCE DEVIATION, ppm
FIGURE 2 - POWER COEFFICIENT (WCR)
RESISTANCE DEVIATION, ppm
60
40
20
0
- 20
- 40
- 60
0
1
2
5
APPLIED POWER IN WATTS
RESISTANCE CHANGE VS APPLIED POWER
MOUNTED ON COOLED HEAT SINK HELD AT + 25 °C
8
10
15
10
5
0
-5
- 10
- 15
0
20
40
60
80
100
120
140
160 180 200
TIME IN SECONDS
RESISTANCE CHANGE UNDER LOAD AT 10 WATTS
MOUNTED ON COOLED HEAT SINK HELD AT + 25 °C
FIGURE 3 - TEMPERATURE COEFFICIENT
RESISTANCE
RESISTANCE CHANGE, ppm
250
200
150
100
50
0
- 50
- 100
- 150
- 200
- 250
- 55
FIGURE 4 - POWER DERATING CURVE
-2
m/
°
C
+
2p
8p
PERCENT OF
RATED POWER
pp
/
°
C
°C
pm
m/
+ 200
+ 100
+ 75
+ 50
+ 25
0
- 55 °C
+ 25 °C
+
p
2p
m/
°
C
-2
pp
m/
°
C
+ 125
- 200
- 50
0
+ 50
+ 100
+ 150
+ 200
AMBIENT TEMPERATURE
+ 25
AMBIENT TEMPERATURE (
°
C)
NO LOAD APPLIED
FIGURE 5 - KELVIN CONNECTION
r
1
I
1
E
1
r
3
I
m
0
R
E
2
r
4
r
2
I
2
r
5
Kelvin, 4-terminal, connections are utilized for these low
ohmic value products to measure a precise voltage drop
across the resistive element. In these applications the
contact resistance, lead resistance, and their TCR effect may
be greater than that of the element itself and could cause
significant errors if the standard 2-terminal connection is
used. Figure 5 shows a high impedance measurement
system where r
5
approaches infinity and I
m
approaches zero
resulting in negligible IR drop through r
3
and r
4
which
negates their lead resistance and TCR effect. With the
voltage sense leads E
1
and E
2
inside of r
1
and r
2
the
resistance and TCR effect of the current leads, I
1
and I
2
are
negated and only the resistance and TCR of the element R
are sensed. This method of measurement is essential for
precise current sensing.
8
SALES
• ASIA/JAPAN: foilsales.asia@vishay.com
• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• AMERICAS: foilsales.usa@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
Document Number: 63086
Revision: 02-Mar-05
For technical questions, contact: foil@vishay.com
www.vishay.com
2
Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal
®
Foil Technology
Rapid
ΔR
Stabilization - Low WCR - Low TCR
FIGURE 6 - STANDARD IMPRINTING AND DIMENSIONS
VHP4Z
Mounting
Hole
0.665 (16.89)
± 0.005 (± 0.13)
1.186 (30.13)
± 0.005 (± 0.13)
1.530 (38.86)
± 0.005 (± 0.13)
0.266 (6.76)
± 0.005 (± 0.13)
0.335 (8.51)
± 0.005 (± 0.13)
Standard Marking
Arrangement
VISHAY
Model No.
VHP-3Z
Res. Val.
21K500
Res. Tol.
± 0.01 %
Date Code
9802
Ex: 98 02
Year Week
I1
E1
E2
I2
0.770 (19.56)
max dia
I2
TO-3 cap
TO-3 base
0.040 (1.00) dia
± 0.005 (± 0.13)
0.43 (10.92)
± 0.01 (± 0.25)
1.00 (25.4)
± 0.005 (± 0.13)
0.222
(5.64)
E1
E2
0.156 dia (3.9)
± 0.005 (± 0.13)
VPR247Z
0.120 ± 0.005
(3.05 ± 0.13)
0.690 ± 0.005
(17.53 ± 0.13)
0.040 ± 0.005 (1.02 ± 0.13)
0.140 ± 0.005
(3.56 ± 0.13)
(Dia. Thru Hole)
0.45 (11.43)
min.
I1
VFP4Z
0.125 ± 0.005
(5.46 ± 0.13)
1.575 ± 0.016 (40 ± 0.4)
1.181 ± 0.016 (30 ± 0.4)
0.197 (5)
0.276
- 0.008
(7.0
- 0.2
)
0.118 (3)
+ 0.004
+ 0.1
0.820 ± 0.005
(20.83 ± 0.13)
0.010 (0.254) max
Sleeve Extension
VISHAY
VPR247Z
XXXX
0R2000 1 %
Date Code
10
01
Year Week
Tolerance
0.500 Min
(12.70)
VISHAY
VFP-4Z
(Value)
(Tol.)
(Date Code)
0.150 ± 0.004
(3.8 ± 0.1)
0.394 ± 0.008
(10 ± 0.2)
Lead Dia.
0.025 (0.633)
Solder Coated
Copper
0.787 ± 0.016
(20 ± 0.4)
Resistance
Value
I E E I
0.200 ± 0.005
1 1 2 2
(5.08 ± 0.13)
S
0.100 ± 0.005
(2.54 ± 0.13)
LS
Gold Plated
Copper Leads
0.025 Dia (0.633)
1.00 Min.
(25.4 Min.)
0.120 ± 0.005
(3.05 ± 0.13)
I1 E1 E2
I2
0.200 [x3] (5.08)
VCS331Z
0.138 (3.5)
NOMINAL
1.340 ± 0.008 (34.0 ± 0.2)
0.701 ± 0.008
(17.8 ± 0.2)
0.087 (2.2)
MAXIMUM
0.210 (5.33)
MAXIMUM
VCS332Z
1.340 ± 0.008 (34.0 ± 0.2)
0.701 ± 0.008
(17.8 ± 0.2)
0.138 (3.5)
NOMINAL
0.087 (2.2)
MAXIMUM
0.210 (5.33)
MAXIMUM
0.197 ± 0.008
(5.0 ± 0.2)
1.063 (27.0)
MAXIMUM
VISHAY
VCS331Z
0R2000 1 %
B9825
0.16 (0.4)
NOMINAL
1.024 (26.0)
MAXIMUM
VISHAY
VCS332Z
8R2000 0.1 %
B9825
0.032 (0.8)
NOMINAL
0.197 ± 0.008
(5.0 ± 0.2)
0.040 (1.0)
NOMINAL
0.040 (1.0)
NOMINAL
0.216 (5.5)
MINIMUM
0.040 (1.0)
NOMINAL
0.689 ± 0.020 (17.5 ± 0.5)
1.083 ± 0.20 (27.5 ± 0.5)
0.689 ± 0.020 (17.5 ± 0.5)
1.083 ± 0.20 (27.5 ± 0.5)
SALES
• ASIA/JAPAN: foilsales.asia@vishay.com
• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• AMERICAS: foilsales.usa@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
www.vishay.com
3
For technical questions, contact: foil@vishay.com
Document Number: 63086
Revision: 02-Mar-05
1.00 (25.4)
MINIMUM
Power Current Sense Resistors
Z-Based Bulk Metal
®
Foil Technology
Vishay Foil Resistors
Rapid
ΔR
Stabilization - Low WCR - Low TCR
TABLE 1 - RESISTANCE VALUE VS TOLERANCE
RESISTANCE RANGE (Ω)
10 to 500
5 to < 10
2 to < 5
1 to < 2
0.5 to < 1
0.25 to < 0.5
STANDARD TOLERANCE (%)
± 0.01 %
± 0.02 %
± 0.05 %
± 0.10 %
± 0.25 %
± 0.50 %
TABLE 2 - SPECIFICATIONS
TEST OR CONDITION
Wattage Coefficient of Resistance (WCR)
Temperature Coefficient of Resistance (TCR)
(- 55 °C to + 125 °C, + 25 °C Reference)
Thermal Resistance
Maximum Ambient Temperature
Rated Power
Zero Power
Power Rating
at + 25 °C
VHP4Z
VPR247Z
VFP4Z
VCS331Z
VCS332Z
Load Life Stability
+ 25 °C
+ 150 °C
10 Watts or 3 Amps Maximum (Heat Sink)
2), 3)
3 Watts or 3 Amps Maximum (Free Air)
3)
10 Watts or 5 Amps Maximum (Heat Sink)
2),3)
3 Watts or 5 Amps Maximum (Free Air)
3)
± 0.05 % Max
ΔR,
10 W on heat sink at + 25 °C, 2000 hours
± 0.01 % Max
ΔR,
3 W on heat sink at + 25 °C, 2000 hours
± 0.05 % Max
ΔR,
3 W in free air at + 25 °C, 2000 hours
0.1 µH Maximum; 0.08 µH Typical
< 0.1 ppm/V
< 0.010 µV(RMS)/Volt of applied voltage (- 40 dB)
PERFORMANCE
4 ppm/Watt Maximum
1)
≥
1.0
Ω
to 500
Ω,
± 2 ppm/°C Maximum
0R25 to < 1.0
Ω,
± 3 ppm/°C Maximum
6 °C/Watt
1)
Inductance
Voltage Coefficient
Current Noise
NOTES:
1. Mounted on a cooled heat sink held at + 25°C
2. Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK)
3. Whichever is lower
TABLE 3 - ORDERING INFORMATION
Please specify Vishay VHP4Z, VPR247Z, VFP4Z, VCS331Z, VCS332Z series resistors as follows:
MODEL NO.
VHP4Z
RESISTANCE
RANGE
0.25 to < 500
Ω
RESISTANCE VALUE
LETTER
DESIGNATOR
R
Example: 100R01 = 100.01
Ω
Resistance Value, in
Ω,
is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th is a dual purpose letter
that designates both the multiplier and the location of the comma or decimal.
MULTIPLIER
FACTOR
x1
TOLERANCE
0.01 %
SALES
• ASIA/JAPAN: foilsales.asia@vishay.com
• UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• AMERICAS: foilsales.usa@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
Document Number: 63086
Revision: 02-Mar-05
For technical questions, contact: foil@vishay.com
www.vishay.com
4
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
www.vishay.com
1
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