NEW
Ultra High Precision Bulk Metal® Z-Foil Technology
Power Current Sensing Resistors with TCR of ± 0.05 ppm/°C
and Power Rating up to 7 W
VPR5Z, VPR7Z
Vishay Foil Resistors
Document Number: 63188 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 22-Jul-10 1
INTRODUCTION
These Bulk Metal® Z-Foil power current sensing resistors are
direct replacements for certain wirewound devices but
without the inductive characteristics of wirewounds. The
anodized aluminum housing is drilled and countersunk to
accept flat head screws for thermal mounting. Because the
device is internally Kelvin connected, there is no restriction
on the lead lengths as would be the case if this were a two
terminal device. Frequently used in YIG oscillator circuits
these devices contribute to superior frequency stability.
FEATURES
•Temperature coefficient of resistance (TCR):
± 0.05 ppm/°C (0 °C to 60 °C)
± 0.2 ppm/°C (- 55 °C to + 125 °C, + 25 °C ref.)
•Tolerance: ± 0.01 %
•Resistance range: 5 Ω to 100 KΩ
•Vishay Foil Resistors are not restricted to standard values;
specific “as required” values can be supplied at no extra
cost or delivery (e.g. 1K2345 vs. 1K)
•Load life stability: ± 0.01 % (100 ppm) at 70 °C, 2000 h at
rated power
•Electrostatic discharge (ESD) up to 25 000 V
•Non-inductive, non-capacitive design
•Rise time: 1 ns effectively no ringing
•Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)
•Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•Thermal EMF: 0.05 µV/°C typical
•Voltage coefficient: < 0.1 ppm/V
•Non-inductive: < 0.08 µH
•Pattern design minimizing hot spots
•Terminal finish available: lead (Pb)-free or tin/lead alloy*
•Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
TABLE 1 - TOLERANCE AND TCR VS. RESISTANCE
MODEL
NUMBER
RESISTANCE
RANGE
(Ω)
BEST
TOLERANCE
(%)
TYPICAL TCR AND MAXIMUM SPREAD
(- 55 °C to + 125 °C, + 25 °C ref.)
(ppm/°C)
MAXIMUM WORKING
VOLTAGE
(V)
POWER RATING
AT 25 °C (1)
(W)
VPR5Z
5 to 10 ± 0.1 ± 0.2 ± 4.3
300 5
> 10 to 50 ± 0.05 ± 0.2 ± 3.8
> 50 to 100 ± 0.05 ± 0.2 ± 2.8
> 100 to 100K ± 0.01 ± 0.2 ± 1.8
VPR7Z
5 to 10 ± 0.1 ± 0.2 ± 4.3
300 7
> 10 to 50 ± 0.05 ± 0.2 ± 3.8
> 50 to 100 ± 0.05 ± 0.2 ± 2.8
> 100 to 100K ± 0.01 ± 0.2 ± 1.8
Note
(1) Mounted on aluminum chassis (6" L x 4" W x 2" H x 0.040" Th) per MIL-PRF-39009/1B.
* Pb containing terminations are not RoHS compliant, exemptions may apply
FIGURE 1 - POWER DERATING CURVE
100
75
50
25
0
Rated Power (%)
+ 50 + 100 + 150
Ambient Temperature (°C)
0 - 50
- 55
+ 25
VPR5Z, VPR7Z
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63188
2Revision: 22-Jul-10
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
Note: Foil shown in black, etched spaces in white
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Interloop
Capacitance
Reduction
in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Current Path
After Trimming
FIGURE 3 -
TYPICAL RESISTANCE/
TEMPERATURE CURVE (Z-FOIL)
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C)
TCR Chord Slopes for Different Temperature Ranges
ΔR
R
(ppm)
0
0.05 ppm/°C
- 0.1 ppm/°C 0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C- 0.16 ppm/°C
- 400
+ 300
+ 400
TABLE 2 - STANDARD IMPRINTING AND DIMENSIONS
Date Code
10
Week
10
Year A F
XXXX
(2)
C
Mounting Holes (1)
D
B
E
Vishay VPR5Z
100R01 0.1 %
I1E1E2I2
R
V
I
I
3) 3)
4)4)
E2
E1
I2
I1
E1E2
I1I2
DIMENSIONS
A B C D E F (min)
in mm in mm in mm in mm in mm in mm
0.625 15.88 0.450 11.43 0.312 7.93 0.400 10.16 0.350 8.89 1.500 38.10
1.030 26.16 0.450 11.43 0.312 7.93 0.788 20.02 0.350 8.89 1.375 34.90
Notes
(1) #4-40 F.H. machine screw (not included)
(2) Anodized aluminum housing
(3) #26 AWG, teflon coated, 4" min.
(4) #20 AWG, solder coated copper
VPR5Z, VPR7Z
Vishay Foil Resistors
Document Number: 63188 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 22-Jul-10 3
POST MANUFACTURING OPERATIONS (PMO)
Many analog applications can include requirements for
performance under conditions of stress beyond the normal
and over extended periods of time. This calls for more than
just selecting a standard device and applying it to a circuit.
The standard device may turn out to be all that is needed but
an analysis of the projected service conditions should be
made and it may well dictate a routine of stabilization known
as post manufacturing operations or PMO. The PMO
operations that will be discussed are only applicable to Bulk
Metal Foil resistors. They stabilize Bulk Metal Foil resistors
while they are harmful to other types. Short time overload,
accelerated load life, and temperature cycling are the three
PMO exercises that do the most to remove the anomalies
down the road. Vishay Bulk Metal Foil resistors are
inherently stable as manufactured. These PMO exercises
are only of value on Bulk Metal Foil resistors and they
improve the performance by small but significant amounts.
Users are encouraged to contact Vishay Foil applications
engineering for assistance in choosing the PMO operations
that are right for their application.
TABLE 4 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y011825K5000T9L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
Y R = Ω
K = KΩ
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
0118 = VPR5Z
0119 = VPR7Z
T= ± 0.01 %
A= ± 0.05 %
B= ± 0.1 %
L = bulk
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0118 25K5000 T 9 L:
TYPE: VPR5Z
VALUE: 25.5 kΩ
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk
HISTORICAL PART NUMBER: VPR5Z T 25K500 T B (will continue to be used)
VPR5Z T25K500 T B
MODEL TERMINATION OHMIC VALUE RESISTANCE
TOLERANCE PACKAGING
VPR5Z
VPR7Z
T = lead (Pb)-free
None = tin/lead alloy
25.5 KΩT= ± 0.01 %
A= ± 0.05 %
B= ± 0.1 %
B = bulk
Note
(1) For non-standard requests, please contact application engineering.
1182 K505Y0 T90 L0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
