300144Z, 300145Z (Z-Foil)
Vishay Foil Resistors
Bulk Metal
®
Foil Technology Ultra High Precision Z-Foil Voltage Divider
Resistors with TCR Tracking to 0.1 ppm/°C, Power Coefficient Tracking
of 5 ppm at Rated Power, and Tolerance Match to 0.005 % (50 ppm)
FEATURES
Temperature coefficient of resistance (TCR):
absolute: ± 0.05 ppm/°C typical (0 °C to + 60 °C)
± 0.2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.)
TCR tracking: 0.1 ppm/°C typical
Tolerance: absolute and matching to 0.005 % (50 ppm)
Power coefficient tracking “R due to self heating”: 5 ppm
at rated power
Power rating: 0.2 W at 70 °C, for the entire resistive
element R
1
and R
2
, divided proportionally between the two
values
R
2
V
1
V
2
R
1
R
3
R
4
-
+
V
out
300144
300145
APPLICATIONS
Instrumentation amplifiers
Bridge networks
Differential amplifiers
Military
Space
Medical
Automatic test equipment
Down-hole (high temperature)
Load life ratio stability: < 0.005 % (50 ppm) 0.2 W at 70 °C
for 2000 h
Maximum working voltage: 200 V
Resistance range: 100R to 20K per resisitve element
Foil resistors are not restricted to standard values/ratios;
specific “as requested” values/ratios can be supplied at no
extra cost or delivery (e.g. 1K2345 vs. 1K)
Electrostatic discharge (ESD) up to 25 000 V
Non-inductive, non-capacitive design
Rise time: 1 ns effectively no ringing
Current noise: 0.010 µV
RMS
/V of applied voltage (< - 40 dB)
Thermal EMF: 0.05 µV/°C typical
Voltage coefficient: < 0.1 ppm/V
Non inductive: < 0.08 µH
Non hot spot design
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Terminal finish: lead (Pb)-free or tin/lead alloy
Compliant to RoHS directive 2002/95/EC
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
For better performances please contact us
TABLE 1A - MODELS 300144Z AND
300145Z SPECIFICATIONS
RESISTANCE
VALUES
500
to 20 k
100
to < 500
ABSOLUTE
TOLERANCE
± 0.005 %
± 0.01 %
ABSOLUTE TCR
(- 55 °C to + 125 °C, + 25 °C ref.)
TYPICAL AND MAX. SPREAD
± 0.2 ppm/°C ± 1.8 ppm/°C
TABLE 1B - MODELS 300144Z AND
300145Z SPECIFICATIONS
RESISTANCE
RATIO
1:1
> 1:1 to 4:1
> 4:1 to 10:1
> 10:1
TOLERANCE
MATCH
0.005 %
0.01 %
TCR TRACKING MAX.
0.5 ppm/°C
0.75 ppm/°C
1.0 ppm/°C
1.5 ppm/°C
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63115
Revision: 16-Sep-13
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
1
300144Z, 300145Z (Z-Foil)
Vishay Foil Resistors
INTRODUCTION
Possibly you have become so accustomed (and inured) to a
slight instability or drift in your equipment that you no longer
regard the problem as a soluble. You have learned to live
with it. But have your customers? They are still waiting for a
solution. And if you cannot provide one, someone else may.
There are so many stability problems directly traceable to
resistive devices that skimping on the quality of a few critical
resistors, resistive networks may be counterproductive.
Load Life Stability
Load Life stability is the characteristics most relied upon to
demonstrate resistor long term reliability. Many applications
require a load life of between 2000 h to 10 000 h with limits
on the amount of shift and the number of failure rate
demonstration.
The ultra high precision Z-Foil divider and network have the
tightest allowable limits.
Whether high reliable application or not, the load life stability
of Foil resistors is unparalleled and long term serviceability is
assured.
With Bulk Metal
®
Foil resistors, only a minimal shift in
resistance value will occur during its entire lifetime. Most of
this shift takes place during the first few hundred hours of
operation, and virtually no change is noted thereafter.
Ratio Stability
Resistors in dividers or networks form are called upon to
maintain a track and match more than at ambient
temperature and when they expose to stress factors before,
during and after the assembly. Throughout the long service
life of the equipment, the resistors around the op amplifier for
example are required to track (to hold ratio) even though the
dissipation in the feedback resistor is different than that in the
sense resistor, causing on one to be at higher temperature
than the other. This is called tracking under power for short
term (power coefficient of resistance) or for a long term (load
life stability).
Temperature Coefficient of Resistance (TCR)
The low temperature coefficient of resistors are achieved by
the use of especially selected materials for the resistive and
insulating members of the resistors which self-compensate
the thermal coefficient of expansion.
Change in a metal’s resistivity occurs in two ways: by
changes in temperature (external and internal) and by
changes in mechanical strain.
By developing resistor element materials whose resistances
change positively when subjected to temperature increase,
and negativity when subjected to compression, the Foil
resistors achieved, in the temperature range - 55 °C to + 125
°C, a maximum absolute TCR of 5 ppm/°C for the classical
Foil and maximum 2 ppm/°C for the Z-Foil technology.
To achieve maximum optimum TC tracking between
resistors, all factors that affect the TCR of each resistor must
be uniform. Whatever their resistance range or wattage, all
Foil resistors exhibit identical temperature coefficients as all
are made of the same alloy and of identical physical and
electrical characteristics. The only variable between these
resistors is the pattern photoetched on the element, a
process that does not alter alloy properties in any way. In
resistors, all TCR and other electrical characteristics are
inherent to the alloy, and are therefore uniform between
individual resistors, as well as between batches, thus
accurate “tracking” of one style resistor to another is assured
(even if they differ in size and range). Data on TCR spread
shown (fig. 4) illustrate the excellent tracking available with
all Foil resistors.
Because of this excellent tracking ability, resistors are ideal
for use in resistor networks where accurate ratios must be
maintained over a wide temperature range.
This designed-in TCR uniformity contrasts sharply with the
TCR tracking capability of wirewound and conventional
metal film units. TCR characteristics between wirewounds of
different resistance ranges and wattage are highly
non-uniform, because (a) different wire diameters are used,
(b) winding-induced stresses-which have a direct bearing on
TCR.
Conventional metal films units offer quite variable and often
unpredictable TC tracking because composition, film
thickness, and deposition techniques are varied to meet
different resistance range and wattage requirements.
Our application engineering department is available to
advise and make recommendations. For non-standard
technical requirements and special applications. Please
contact us.
FIGURE 1 - TRIMMING TO VALUES
(conceptual illustration)
Interloop
Capacitance
Reduction
in Series
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Note:
Foil shown in black, etched spaces in white
www.vishayfoilresistors.com
2
For any questions, contact:
foil@vishaypg.com
Document Number: 63115
Revision: 16-Sep-13
300144Z, 300145Z (Z-Foil)
Vishay Foil Resistors
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS
in inches (millimeters)
Model 300144Z and Schematic
(2)
0.295
(7.49)
VFR
9825
300144Z
0.1
(2.54)
Match
Tolerance
10K000
0.01%
10K000
6
Model 300145Z and Schematic
(2)(3)
0.375
(9.53)
5
4
0.2
(5.08)
Date Code
Model No.
0.015 ± 0.005
(0.38 ± 0.13)
0.025 ± 0.005
(0.64 ± 0.13)
0.320
(8.13)
R
1
R
2
6
5
4
1
R1
Indicator
R
4
1
2
3
Date Code
Model No.
VFR
9825
300145Z
0.375
(9.53)
10K000
0.01%
10K000
R
3
0.75
(1)
(19.05)
0.015 ± 0.005
(0.38 ± 0.13)
R
1
0.75
(1)
(19.05)
Match
Tolerance
R
2
Dimensional Tolerance: ± 0.010" (0.25)
0.1 (2.54)
(1)
0.025 ± 0.005
(0.64 ± 0.13)
1
2
3
(2)
(3)
Lead wires: #22 AWG solder coated copper,
0.75" minimum length
Each divider pair consists of two resistors on one
single chip
For model 300145Z the 2 chips are independent
and with no special relationship from chip to chip
1
2
3
0.1 (2.54)
FIGURE 3 - POWER DERATING CURVE
300144Z, 300145Z
- 55 °C
+ 70 °C
Rated Power
FIGURE 4 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
(for more details see table 1A)
TCR Chord Slopes for Different Temperature Ranges
+ 500
100 %
Percent of Rated Power at + 70 °C
75 %
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 0.16 ppm/°C
- 55
- 25
0
+ 25
50 %
25 %
Recommended
operation for
< 150 ppm
ΔR
Δ
after 2000 h
load life
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
+ 60 + 75
+ 100 + 125
0
- 75
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Ambient Temperature (°C)
Note
• Power is divided proportionally between the 2 values
Document Number: 63115
Revision: 16-Sep-13
For any questions, contact:
foil@vishaypg.com
www.vishayfoilresistors.com
3
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