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)
VPR221Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63116 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 25-Mar-10 1
IM
PR
OVED
P
R
ODUC
T
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
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 “R 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 to 500
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 ()
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
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
