HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
New Generation of Secondary Standards Hermetically Sealed Construction Ultra High
Precision Z-Foil Technology Resistors with TCR of ± 0.2 ppm/°C, Tolerance of ± 0.001 %
and Load Life Stability of ± 0.002 % (Metrology, Laboratory, Instrumentation, Industrial)
FEATURES
Temperature coefficient of resistance (TCR):
± 0.2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.). For ultra high performances
(instrumentation and metrology) please refer to
the last page
Resistance range: 5
to 1.1 M (higher or lower values of
resistance available)
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)
Power coefficient “R due to self heating”:
5 ppm at rated power with the Z-Foil technology
Tolerance:
to ± 0.001 % (10 ppm)
Load life stability to ± 0.002 % (20 ppm) at 25 °C, 2000 h
at rated power
Load life stability, can be considerably improved
through in-house stabilization
Shelf life stability: 2 ppm for at least 6 years
(unaffected by humidity)
Electrostatic discharge (ESD) up to 25 000 V
Power rating: 0.3 W to 2.5 W at + 25 °C (depending on
model - see table 2)
Non-inductive, non-capacitive design
Non hot spot 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
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Non-inductive: < 0.08 µH
Terminal finish available: lead (Pb)-free or tin/lead alloy
Impervious to harmful environments - oil filled
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
For better performances (values, TCR, tolerance, stability),
please contact us
INTRODUCTION
The Z-Foil based oil filled, hermetically sealed HZ Series
resistors represent an industry breakthrough. The hermetic
sealing eliminates the ingress of moisture and oxygen, while
the oil acts as a thermal conductor, thus eliminating
long-term degradation elements of unsealed resistors, while
at the same time allowing the device to accept short periods
of overload without degradation.
The Z-Foil technology provides a significant reduction of the
resistive components, sensitivity to ambient temperature
variations (TCR) and applied power changes (PCR). When
combined with the hermetic sealing and oil filling, the
HZ Series resistors become
the most precise and stable
resistors available.
They are used as the most precise
secondary standards for ultra precision metrology.
With accuracies of ± 0.001 % (10 ppm) and a resistance
range from 5
to 1.1 M and long term shelf life of less than
2 ppm, these devices are virtually secondary standards that
can be carried in sets for daily or periodic calibration of
factory measurement equipment.
The HZ Series is available with laboratory and metrology
level precision and long-term stability with additional
in-house oriented processes such as: chip stabilization,
special TCR plotting, additional treatments for ultra
stability and special post manufacturing operations
(PMO). (Please refer to the last page)
TABLE 1 - TCR VS. RESISTANCE VALUE
RESISTANCE VALUE
()
TYPICAL TCR AND
MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C ref.)
(ppm/°C)
± 0.2 ± 2
± 0.2 ± 3
± 0.2 ± 4
FIGURE 1 - SHELF LIFE - VHA518-11
12K9 VS. QHE
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
- 0.1
0
100 200 300 400 500 600 700 800 900 1000
100 to < 1M1
50 to < 100
5 to < 50
Note
• For maximum TCR < 1 ppm/°C, see VHP100 and contact
application engineering
Resistance Change (ppm)
Time (Days)
Document Number: 63120
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
FIGURE 2 - 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
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE
()
10 to 66K
66K to 100K
STANDARD RESISTANCE
TOLERANCE PER RANGE
RANGE () TIGHTEST (%)
MAXIMUM
WORKING
VOLTAGE
(2)
POWER AVERAGE
CONSTRUCTION
RATING WEIGHT
BRIEF
(g)
at + 25 °C
0.3 W
0.2 W
DIMENSIONS
(3)
mm
4.11 ± 0.51
10.54 ± 0.51
10.92 ± 0.51
25.4 ± 3.18
3.81 ± 0.25
2.41 max.
15.88 ± 0.79
9.53 ± 0.79
25.4 min.
25.4 ± 0.79
9.53 ± 0.79
25.4 min.
15.88 ± 0.79
12.7 ± 0.79
25.4 min.
25.4 ± 0.79
12.7 ± 0.79
25.4 min.
INCHES
W: 0.162 ± 0.020
Oil-filled, tinned L: 0.415 ± 0.020
copper leads, nickel H: 0.430 ± 0.020**
shell, kovar and LL: 1.000 ± 0.125
LS: 0.150 ± 0.010
(4)
glass header
ST: 0.095 max.
L: 0.625 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 min.
L: 1.000 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 min.
L: 0.625 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 min.
L: 1.000 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 min.
VHP202Z
300
1.4
VHA412Z
VHA414Z
10 to 66K
66K to 100K
5 to 120K
> 120K to 200K
5 to 180K
180K to 300K
250
350
0.3 W
0.2 W
0.5 W
0.3 W
4.6
7.3
± 0.001
1K to
(1)
0.75 W
± 0.0025
500 to < 1K
6.3
350
VHA512Z*
0.4 W
± 0.005
50 to < 500
± 0.01
30 to < 50
1.0 W
± 0.02
VHA516-4Z* 5 to 240K 400K 20 to < 30
Oil-filled,
0.5 W
> 240K to
± 0.05
10 to < 20
tinned copper
1.25 W
5 to 300K
± 0.1
9.2
500
VHA516-5Z* > 300K to 500K 5 to < 10
leads, tinned brass
0.6 W
shell, kovar and
1.5 W
5 to 360K
VHA516-6Z* > 360K to 600K
glass end bells
0.7 W
1.75 W
VHA518-7Z* 5 to 420K
0.8 W
> 420K to 700K
2.0 W
VHA518-8Z* 5 to 480K
0.9 W
> 480K to 800K
2.25 W
VHA518-9Z* 5 to 540K
13.5
600
1.0 W
> 540K to 900K
2.5 W
VHA518-10Z* 5 to 600K
1.1 W
> 600K to 1.0M
2.5 W
VHA518-11Z* 5 to 660K
1.2 W
> 660K to 1.1M
Notes:
*Available in a 4-lead terminal **0.375 H available - See next page for numbered footnotes
L: 1.500 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 min.
38.1 ± 0.79
12.7 ± 0.79
25.4 min.
FIGURE 3 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
TCR Chord Slopes for Different Temperature Ranges
+ 500
+ 400
+ 300
+ 200
+ 100
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 55
- 25
0
+ 25
+ 60 + 75
+ 100 + 125
- 0.16 ppm/°C
FIGURE 4 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 55 °C
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Ambient Temperature (°C)
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2
For any questions, contact:
foil@vishaypg.com
Document Number: 63120
Revision: 25-Mar-10
HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
FIGURE 5 - STANDARD IMPRINTING AND DIMENSIONS
Front View
L
W
Rear View
Resistance
Value Code
Tolerance
Serial
Number
Lead Material #22 AWG
Round Solder Coated Copper
D
Date Code
07
10
Year Week
Model Number
H
VISHAY
XXXX
VHP202Z
Model
Number
ST
100R01
0.01%
XXXX
VISHAY
XXXX
L
LL
Date Code
07
06
Year Week
LS
LL
Lead Material
#22 AWG Round
Solder Coated Copper
VHA412Z
100R01 0.005%
Resistance
Value Code
Tolerance
TABLE 3 - “H” SERIES SPECIFICATIONS
Stability
(8)
Load life at 2000 h
Shelf life
Current Noise
High Frequency Operation
Rise time
Inductance (L)
(5)
Capacitance (C)
Voltage Coefficient
Thermal EMF
(7)
Hermeticity
Notes
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
± 0.002 % (20 ppm) at 25 °C at rated power
± 2 ppm (0.0002 %) after at least 6 years
< 0.010 µV (RMS)/V of applied voltage (- 40 dB)
1.0 ns without ringing
0.1 µH maximum; 0.08 µH typical
1.0 pF maximum; 0.5 pF typical
< 0.1 ppm/V
(6)
0.1 µV/°C maximum; 0.05 µV/°C typical; 1 µV/W maximum
10
-7
atmospheric cc/s maximum
Upper end of resistance range varies with model selected (i.e. VHP202Z; the range is to 100 k; VHA518-10Z, the range is to 1.0 M) per
table 2
Not to exceed power rating of resistor
Insulating sleeve - a special case insulating plastic sleeve is available on VHAZ models - specify letter “P” as a suffix to model number
(i.e. VHA412ZP)
0.200" (5.08 mm) lead spacing available - specify VHP202ZJ
Inductance (L) due mainly to the leads
The resolution limit of existing test equipment (within measurement capability of the equipment, or “essentially zero”)
µV/°C relates to EMF due to lead temperature difference and µV/W due to power applied to the resistor
Load life
R
max. can be reduced through in-house oriented processes (PMO)
POST MANUFACTURING OPERATIONS OR PMO FOR IMPROVED END OF LIFE
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,
Document Number: 63120
Revision: 25-Mar-10
accelerated load life, and temperature cycling are the three
PMO exercises that do the most to remove the anomalies
down the road. 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 amounts that are small but significant when compared to
the very tight tolerances. Users are encouraged to contact
Foil applications engineering for assistance in choosing the
PMO operations that are right for their application.
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
TABLE 4 - GLOBAL PART NUMBER INFORMATION
(1)
NEW GLOBAL PART NUMBER: Y1750120K500V9L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
K
= k
M
= M
CHARACTERISTICS
0
= standard product, tin/lead termination
1
= with plastic sleeve, tin/lead termination
9
= standard product, lead (Pb)-free termination
19
= with plastic sleeve, lead (Pb)-free termination
Other
= custom
Y
1
7
5
0
1
2
0
K
5
0
0
V
9
L
PRODUCT CODE
6071
= VHP202Z
1748
= VHP202ZJ
1749
= VHA412Z
1751
= VHA414Z
1750
= VHA512Z
4725
= VHA512Z (4-terminals)
1752
= VHA516-4Z
4726
= VHA516-4Z (4-terminals)
1753
= VHA516-5Z
4727
= VHA516-5Z (4-terminals)
1754
= VHA516-6Z
4728
= VHA516-6Z (4-terminals)
1755
= VHA518-7Z
4729
= VHA518-7Z (4-terminals)
1756
= VHA518-8Z
4730
= VHA518-8Z (4-terminals)
1757
= VHA518-9Z
4731
= VHA518-9Z (4-terminals)
1758
= VHA518-10Z
4732
= VHA518-10Z (4-terminals)
1759
= VHA518-11Z
4733
= VHA518-11Z (4-terminals)
RESISTANCE TOLERANCE
S
= ± 0.001 %
U
= ± 0.002 %
X
= ± 0.0025 %
V
= ± 0.005 %
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
PACKAGING
L
= bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1750 120K500 V 9 L:
TYPE: VHA512Z
VALUE: 120.5 k
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER: VHA512ZT 120K50 V B (will continue to be used)
VHA512Z
MODEL
VHP202Z
VHP202ZJ
VHA412Z
VHA414Z
VHA512Z
(2)
VHA516-4Z
(2)
VHA516-5Z
(2)
VHA516-6Z
(2)
VHA518-7Z
(2)
VHA518-8Z
(2)
VHA518-9Z
(2)
VHA518-10Z
(2)
VHA518-11Z
(2)
Notes
(1)
(2)
T
TERMINATION
T
= lead (Pb)-free
None
= tin/lead
PLASTIC SLEEVE
P
= plastic sleeve
None
= standard
120K50
OHMIC VALUE
120K50
= 120.5 k
V
TOLERANCE
S
= ± 0.001 %
U
= ± 0.002 %
X
= ± 0.0025 %
V
= ± 0.005 %
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
B
PACKAGING
B
= bulk pack
For non-standard requests, please contact application engineering
4-terminal construction of these types are available, please quote:
2-Terminal
4-Terminal
VHA512Z VHA516-4Z VHA516-5Z VHA516-6Z VHA518-7Z VHA518-8Z VHA518-9Z VHA518-10Z VHA518-11Z
302073Z
302074-4Z
302074-5Z
302074-6Z
302075-7Z
302075-8Z
302075-9Z
302075-10Z
302075-11Z
www.foilresistors.com
4
For any questions, contact:
foil@vishaypg.com
Document Number: 63120
Revision: 25-Mar-10
HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
ULTRA HIGH PRECISION HERMETICALLY
SEALED RESISTORS
INTRODUCTION
The response of Vishay's hermetically sealed resistors under
variable conditions and stresses can be made better by
additional in-house oriented processes (PMO). Processes
such as short time overload, accelerated load life and
temperature cycling produce enhanced levels of accuracy,
stability and speed, offering immediate answers to many
resistor applications currently believed unsolvable, and
opens entirely new areas of design where the use of
resistors had not been considered.
APPLICATIONS INCLUDE
Resistance standards
Feedback devices for operational amplifiers
Precision voltage dividers
Meter multipliers
Precision bridge resistors
Decade voltage dividers
See table 5 for the improvement to expect in hermetically
sealed parts when calling for in-house oriented processes
(PMO).
TABLE 5 - EXAMPLES OF NON-STANDARD REQUIREMENTS
TYPE
VHA518-11 Set of 10 Resistors
(+ 20 °C to + 30 °C)
VALUE
1
10
100
VHA518-7 4-Terminal (+ 20 °C to + 30 °C)
120
1K
10K
100K
10
100
VHA518-7 4-Terminal Matched Pairs
(+ 20 °C to + 30 °C)
1K
10K
100K
VHA518 Set of 10 Resistors
(+ 18 °C to + 28 °C, + 23 °C ref.)
999475
TOLERANCE
ABSOLUTE
0.1 %
0.05 %
0.01 %
0.005 %
0.005 %
0.001 %
0.001 %
0.05 %
0.01 %
0.005 %
0.001 %
0.001 %
0.05 %
MATCH
0.005 %
-
-
-
-
-
-
0.02 %
0.01 %
0.002 %
0.002 %
0.002 %
0.005 %
TCR
ABSOLUTE
0.5 ppm/°C
0.5 ppm/°C
0.5 ppm/°C
0.4 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
0.5 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
TRACKING
0.5 ppm/°C
-
-
-
-
-
-
0.5 ppm/°C
0.5 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
with PMO
with PMO
with PMO
REMARKS
with PMO
ORDERING INFORMATION
Resistors are built to your requirements. Send your schematic and electrical requirements to the applications engineering
department at
foil@vishaypg.com.
A unique part number will be assigned which defines all aspects of your resistor.
Document Number: 63120
Revision: 25-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
5
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