VHP4Z Datasheet, PDF (1/5 Pages) Vishay Siliconix – Z-Based Bulk Metal® Foil Technology Rapid ΔR Stabilization - Low WCR - Low TCR

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.
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 sink¹⁾ 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)
SALES
• AMERICAS: [e-mail]
• ASIA/JAPAN: [e-mail]
• UK/HOLLAND/SCANDINAVIA: [e-mail]
• GERMANY/CZECH REPUBLIC/AUSTRIA: [e-mail] • FRANCE/SWITZERLAND/SOUTHERN EUROPE: [e-mail] • ISRAEL: [e-mail]
www.vishay.com
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For technical questions, contact: [e-mail]
Document Number: 63086
Revision: 02-Mar-05