Document Number: 63116 For any questions, contact: foil@vishay.com
www.vishay.com
Revision: 16-Jul-07 1
VPR221Z (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Z-Foil Power Resistor in
TO-220 Configuration with TCR of ± 0.05 ppm/°C
,
PCR of 4 ppm/W
and Load Life Stability of ± 0.005 % (50 ppm)
I
M
PR
OVED
PR
O
DUCT
Any value at any tolerance available within resistance range
INTRODUCTION
The Z-Foil Technology provides a significant reduction of the
resistive component’s sensitivity to ambient temperature
variations (TCR) and applied power changes (PCR).
VPR221Z provides high rated power, excellent load life
stability , low Temperature Coefficient (TCR) and low Power
Coefficient (PCR) - all in one resistor. ± 0.05 ppm/°C
Absolute TCR removes error due to temperature gradients.
By taking advantage of the overall stability and reliability of
Vishay Bulk Metal
®
Z-Foil resistors, designers can
significantly reduce circuit errors and greatly improve overall
circuit performances.
Model VPR221Z is a 4 lead kelvin connected device.
Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
Notes
1. MIL-Range (- 55 °C to + 125 °C, + 25 °C Ref.)
• Contact Applications Engineering for other available values
FEATURES
• Temperature Coefficient of Resistance (TCR):
± 0.05 ppm/°C typical (0 °C to + 60 °C)
± 0.2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C Ref.) (see table 1)
• Tolerance: to ± 0.01 %
• Power Coefficient “ΔR due to self heating”
4 ppm/W typical
• Rated Power: 8 W chassis mounted (MIL-PRF-39009)
• Load Life Stability: to ± 0.005 % at 25 °C for 2000 hours,
at 1.5 W
• Resistance Range: 0.5 Ω to 500 Ω
• Electrostatic Discharge (ESD) above 25 000 V
• Short Time Overload ≤ 0.001 % (10 ppm)
• Non Inductive, Non Capacitive Design
• Rise Time: 1 ns without ringing
• Current Noise < - 40 dB
• Thermal EMF: 0.05 µV/°C typical
• Voltage Coefficient < 0.1 ppm/V
• Non Inductive: < 0.08 µH
• Non Hot Spot Design
• Terminal Finishes available: Lead (Pb)-free
Tin/Lead Alloy
• Any value available within resistance range (e.g. 1K234)
• For better performances please contact us
APPLICATIONS
• Automatic Test Equipment (ATE)
• High Precision Instrumentation
• Electron Beam application
• Current Sensing applications
• Pulse applications
• Military
• Power amplifier
• Power supplies
* Pb containing terminations are not RoHS compliant, exemptions may apply
TABLE 1 - TCR AND TOLERANCE
RESISTANCE
RANGE (Ω)
TIGHTEST
RESISTANCE
TOLERANCE
TYPICAL TCR AND
MAX. SPREAD
1)
0.5 to < 1 ± 0.05 % ± 0.2 ppm/°C ± 2.8 ppm/°C
1 to < 10 ± 0.02 % ± 0.2 ppm/°C ± 2.3 ppm/°C
10 to 500 ± 0.01 % ± 0.2 ppm/°C ± 1.8 ppm/°C
FIGURE 1- POWER DERATING CURVE
Available
Pb-free
RoHS*
COMPLIANT
I
1
E
1
E
2
I
2
R
V
I
I
Ambient Temperature (°C)
100
75
50
25
0
r e w o P
d e t a R
f o
t n e c r e P
- 75 150- 25 25 75 125- 50 0 50 100
- 55 °C