Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal® Foil Technology
Rapid ΔR Stabilization - Low WCR - Low TCR
www.vishay.com For technical questions, contact: foil@vishay.com Document Number: 63086
1Revision: 02-Mar-05
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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.
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)
VCS331Z
VCS332Z
VFP4Z
VPR247Z
VHP4Z
Document Number: 63086 For technical questions, contact: foil@vishay.com www.vishay.com
Revision: 02-Mar-05 2
Power Current Sense Resistors
Z-Based Bulk Metal
®
Foil Technology
Rapid
Δ
R Stabilization - Low WCR - Low TCR
Vishay Foil Resistors
SALES
• AMERICAS: foilsales.usa@vishay.com • ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
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 r5 approaches infinity and Im approaches zero
resulting in negligible IR drop through r3 and r4 which
negates their lead resistance and TCR effect. With the
voltage sense leads E1 and E2 inside of r1 and r2 the
resistance and TCR effect of the current leads, I1 and I2 are
negated and only the resistance and TCR of the element R
are sensed. This method of measurement is essential for
precise current sensing.
FIGURE 1 - RAPID STABILIZATION
FIGURE 3 - TEMPERATURE COEFFICIENT
RESISTANCE
FIGURE 5 - KELVIN CONNECTION
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
mpp ,NOITAIVED ECNATSISER
mpp ,EGNAHC EC
N
A
T
SI
S
ER
AMBIENT TEMPERATURE (°C)
NO LOAD APPLIED
+ 8ppm/°C
+ 8ppm/°C
+ 200
- 200
521 +52 +55 -
- 250
- 200
- 150
- 100
- 50
0
50
100
150
200
250
+ 2 ppm/
°
C
- 2 ppm/
°
C
+ 2 ppm/
°
C
- 2 ppm/°C
8
r5
r4
Im
r3
E1E2
0
r2
r1R
I1I2
FIGURE 2 - POWER COEFFICIENT (WCR)
FIGURE 4 - POWER DERATING CURVE
60
40
20
0
- 20
- 40
- 60
0125810
APPLIED POWER IN WATTS
RESISTANCE CHANGE VS APPLIED POWER
MOUNTED ON COOLED HEAT SINK HELD AT + 25 °C
mpp ,NOITAIVED ECNATSISER
+ 100
+ 75
+ 50
+ 25
0
- 50 0 + 50 + 100 + 150 + 200
AMBIENT TEMPERATURE
PERCENT OF
RATED POWER
- 55 °C + 25 °C
Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal
®
Foil Technology
Rapid
Δ
R Stabilization - Low WCR - Low TCR
www.vishay.com For technical questions, contact: foil@vishay.com Document Number: 63086
3Revision: 02-Mar-05
SALES
• AMERICAS: foilsales.usa@vishay.com • ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
FIGURE 6 - STANDARD IMPRINTING AND DIMENSIONS
VISHAY
VCS331Z
0R2000 1 %
B9825
1.340 ± 0.008 (34.0 ± 0.2)
1.083 ± 0.20 (27.5 ± 0.5)
0.138 (3.5)
NOMINAL
1.063 (27.0)
MAXIMUM
0.689 ± 0.020 (17.5 ± 0.5)
0.040 (1.0)
NOMINAL 0.16 (0.4)
NOMINAL
0.701 ± 0.008
(17.8 ± 0.2)
0.197 ± 0.008
(5.0 ± 0.2)
0.040 (1.0)
NOMINAL
0.210 (5.33)
MAXIMUM
0.087 (2.2)
MAXIMUM
0.216 (5.5)
MINIMUM
Z133SCV
0.140 ± 0.005
(3.56 ± 0.13)
(Dia. Thru Hole)
0.690 ± 0.005
(17.53 ± 0.13)
Date Code
10
Week
01
Yea r
VISHAY
VPR247Z
XXXX
0R2000 1 %
S
LS
Tolerance
Resistance
Value Gold Plated
Copper Leads
0.025 Dia (0.633)
I
1
E
1
E
2
I
2
0.010 (0.254) max
Sleeve Extension
0.200 ± 0.005
(5.08 ± 0.13)
0.100 ± 0.005
(2.54 ± 0.13)
0.820 ± 0.005
(20.83 ± 0.13)
0.120 ± 0.005
(3.05 ± 0.13)
0.500 Min
(12.70)
0.120 ± 0.005
(3.05 ± 0.13)
0.125 ± 0.005
(5.46 ± 0.13)
0.040 ± 0.005 (1.02 ± 0.13)
Z742RPV
Mounting
Hole
0.222
(5.64)
E1
E2
I1I2TO-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)
0.770 (19.56)
max dia
0.266 (6.76)
± 0.005 (± 0.13)
0.335 (8.51)
± 0.005 (± 0.13)
0.45 (11.43)
min.
0.156 dia (3.9)
± 0.005 (± 0.13)
0.665 (16.89)
± 0.005 (± 0.13)
1.186 (30.13)
± 0.005 (± 0.13)
1.530 (38.86)
± 0.005 (± 0.13)
VHP4Z
1.575 ± 0.016 (40 ± 0.4)
0.276 (7.0 )
1.181 ± 0.016 (30 ± 0.4)
E
2
E
1I2
I1
0.197 (5)
0.150 ± 0.004
(3.8 ± 0.1)
0.394 ± 0.008
(10 ± 0.2)
Lead Dia.
0.025 (0.633)
Solder Coated
Copper
0.200 [x3] (5.08)
0.118 (3)
0.787 ± 0.016
(20 ± 0.4)
1.00 Min.
(25.4 Min.)
+ 0.004 + 0.1
- 0.008 - 0.2
VISHAY
VFP-4Z
(Value)
(Tol.)
(Date Code)
Z4PFV
VISHAY
VCS332Z
8R2000 0.1 %
B9825
1.083 ± 0.20 (27.5 ± 0.5)
0.689 ± 0.020 (17.5 ± 0.5)
0.040 (1.0)
NOMINAL
0.701 ± 0.008
(17.8 ± 0.2) 0.210 (5.33)
MAXIMUM
0.087 (2.2)
MAXIMUM
1.00 (25.4)
MINIMUM
1.024 (26.0)
MAXIMUM
1.340 ± 0.008 (34.0 ± 0.2)
0.197 ± 0.008
(5.0 ± 0.2)
0.138 (3.5)
NOMINAL
0.032 (0.8)
NOMINAL
Z233SCV
Standard Marking
Arrangement
Model No.
Res. Val.
Res. Tol.
Date Code
Ex: 98 02
Year Week
VISHAY
VHP-3Z
21K500
± 0.01 %
9802
E1E2
I1I2
Document Number: 63086 For technical questions, contact: foil@vishay.com www.vishay.com
Revision: 02-Mar-05 4
Power Current Sense Resistors
Z-Based Bulk Metal
®
Foil Technology
Rapid
Δ
R Stabilization - Low WCR - Low TCR
Vishay Foil Resistors
SALES
• AMERICAS: foilsales.usa@vishay.com • ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
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 1 - RESISTANCE VALUE VS TOLERANCE
RESISTANCE RANGE (Ω)STANDARD TOLERANCE (%)
10 to 500 ± 0.01 %
5 to < 10 ± 0.02 %
2 to < 5 ± 0.05 %
1 to < 2 ± 0.10 %
0.5 to < 1 ± 0.25 %
0.25 to < 0.5 ± 0.50 %
TABLE 2 - SPECIFICATIONS
TEST OR CONDITION PERFORMANCE
Wattage Coefficient of Resistance (WCR) 4 ppm/Watt Maximum1)
Temperature Coefficient of Resistance (TCR)
(- 55 °C to + 125 °C, + 25 °C Reference)
≥ 1.0 Ω to 500 Ω, ± 2 ppm/°C Maximum
0R25 to < 1.0 Ω, ± 3 ppm/°C Maximum
Thermal Resistance 6 °C/Watt1)
Maximum Ambient Temperature
Rated Power
Zero Power
+ 25 °C
+ 150 °C
Power Rating
at + 25 °C
VHP4Z
VPR247Z
VFP4Z
10 Watts or 3 Amps Maximum (Heat Sink)2), 3)
3 Watts or 3 Amps Maximum (Free Air)3)
VCS331Z
VCS332Z
10 Watts or 5 Amps Maximum (Heat Sink)2),3)
3 Watts or 5 Amps Maximum (Free Air)3)
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
Inductance 0.1 µH Maximum; 0.08 µH Typical
Voltage Coefficient < 0.1 ppm/V
Current Noise < 0.010 µV(RMS)/Volt of applied voltage (- 40 dB)
TABLE 3 - ORDERING INFORMATION
Please specify Vishay VHP4Z, VPR247Z, VFP4Z, VCS331Z, VCS332Z series resistors as follows:
MODEL NO. RESISTANCE VALUE TOLERANCE
VHP4Z RESISTANCE
RANGE
LETTER
DESIGNATOR
MULTIPLIER
FACTOR
0.01 %
0.25 to < 500 ΩRx 1
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.
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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All product specifications and data are subject to change without notice.
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(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
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therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
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