VCS331Z, VCS332Z, VFP4Z, CSNG
Vishay Foil Resistors
Bulk Metal® Z-Foil Technology Ultra High-Precision 4-Terminal
Power Current Sensing Resistors with TCR as Low as 0.05 ppm/°C,
Power up to 10 Watts and Thermal Stabilization of <1s
FEATURES
• Low temperature coefficient of resistance (see figure 4):
• 0.05 ppmꢀ°C typical (0°C to +60°C)
• 0.2 ppmꢀ°C typical (–55°C to +125°C, +25°C ref.)
• Resistance range: 0R25 to 500R
• Resistance tolerance: to 0.01ꢁ
VFP4Z
VCS331Z
VCS332Z
• Power rating: 10W on heatsink(1) at +25°C;
3W in free air at +25°C (see Table 2)
• Load life stability:
•
•
•
0.005ꢁ (50 ppm) typical, 3W on heatsink at
+25°C, 2000h
0.01ꢁ (100 ppm) typical, 3W in free air at
+25°C, 2000h
0.01ꢁ typical (100 ppm), 10W on heatsink at
+25°C, 2000h
CSNG
• Vishay Foil Resistors are not restricted to standard
values; specific “as required” values can be supplied at
no extra cost or delivery (e.g. 1R2345 vs. 1R)
• Rapid ΔR stabilization under transient loads (see
Figure 2)
• Thermal resistance: 6°C/W
• Electrostatic discharge (ESD) at least to 25 kV
• Rise time: 1 ns, effectively no ringing
• Tenfold improvement of power coefficient of
resistance (PCR): 4 ppm/W (see Figure 3)
INTRODUCTION
The most precise measuring of electrical current is
achieved by the current sensing resistor method. The
precision and speed of response to changing current
depend on thermal stability of the resistor, as determined
by its low temperature coefficient of resistance (TCR) and
related power coefficient of resistance (PCR), as well as
its net reactance.
VCS331Z, VCS332Z, and VFP4Z (0R25 to 500R)
This series should be selected where rapid ΔR
• Thermal stabilization time <1s (nominal value achieved
within 10 ppm of steady state value)
• Voltage coefficient: <0.1 ppmꢀV
• Current noise: 0.010 μVRMSꢀV of applied voltage
(<–40 dB)
• Inductance: 0.1 μH maximum; 0.08 μH typical
• Thermal EMF: 0.1 μVꢀ°C (see Table 3)
• Non-inductive, non-capacitive design
• Pattern design minimizing hot spots
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-Foil technology provides extremely low PCR
under defined conditions (see Figure 2 and Figure 3). The
low absolute TCR provided by the Z-Foil technology is
measured over the temperature range of –55°C to +125°C
or 0°C to +60°C, +25°C reference (see Figure 4).
All of these devices utilizing the Z-Foil technology are
provided with a true 4-terminal Kelvin connection. This is
a must for precise current sensing when the resistance
value is less than 100Ω (see Figure 6).
Note
(1) Heatsink—aluminum (6” L x 4” W x 2” H x 0.04” THK)
CSNG — New Generation of
Power Current Sense Resistors (>0R005)
FIGURE 1—TRIMMING TO VALUES
(conceptual illustration)
Custom high power designs can be developed for your
specific applications. Vishay Foil Resistors (VFR) recently
introduced New Generation of Power Current Sense
Resistors (CSNG) with short thermal setting time, long-
term stability, high power to 20W and absolute TCR to
0.5 ppmꢀ°C maximum (see page 5).
Interloop
Current Path
Capacitance
Before Trimming
Reduction
in Series
Current Path
After Trimming
Mutual
Inductance
Reduction due
to Opposing
Current in
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Adjacent Lines
For more information, please contact Application
Engineering Department at foil@vishaypg.com.
Note: Foil shown in black, etched spaces in white
*Pb containing terminations are not RoHS compliant; exemptions
may appy
Document No.: 63240
Revision: 13-Jun-2013
For questions, contact foil@vishaypg.com
www.vishayfoilresistors.com
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