VHZ Hermetic (Z-Foil)
New Generation of Secondary Standards Hermetically Sealed Construction Ultra High
Precision Z-Foil Technology Resistors with TCR of ± 0.2 ppm/°C, Tolerance of ± 0.005 % and
Load Life Stability of ± 0.005 % for 10 000 h (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 contact
us
Load life stability to ± 0.005 % (50 ppm) at 70 °C, 10 000 h
at 0.15 W (see table 3)
TABLE 1 - TCR VS. RESISTANCE VALUE
MODEL
VALUE
100
to 100 k
80
to < 100
VH102Z
50
to < 80
25
to < 50
10
to < 25
80
to 121 k
VHZ555 30.1
to 80
(PMO)
(1)
20
to < 30.1
4.99
to < 20
TYP. TCR AND
STANDARD
MAX. SPREAD
TOLERANCE - 55 °C TO + 125 °C
(+ 25 °C ref.)
(2)
± 0.005 %
± 0.005 %
± 0.01 %
± 0.01 %
± 0.02 %
± 0.005 %
± 0.005 %
± 0.01 %
± 0.05 %
± 0.2 ± 0.6 ppm/°C
± 0.2 ± 0.8 ppm/°C
± 0.2 ± 1.0 ppm/°C
± 0.2 ± 1.3 ppm/°C
± 0.2 ± 1.6 ppm/°C
± 0.2 ± 1.8 ppm/°C
± 0.2 ± 2.3 ppm/°C
± 0.2 ± 2.3 ppm/°C
± 0.2 ± 2.8 ppm/°C
Load life stability, can be considerably improved
through in-house stabilization (PMO)
Shelf life stability: 2 ppm for at least 6 years
(unaffected by humidity)
Resistance range: 5
to 121 k (higher or lower values of
resistance available)
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)
Power coefficient “R due to self heating”:
5 ppm at rated power with the Z-Foil technology
Tolerance: to ± 0.005 % (50 ppm)
Electrostatic discharge (ESD) up to 25 000 V
Power Rating: 0.6 W at + 70 °C; 0.3 W at + 125 °C
Thermal EMF: 0.1 µV/°C maximum, 0.05 µV/°C typical
1 µV/°C
Hermeticity: 10
-7
atmospheric cc/s maximum
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)
Voltage coefficient: < 0.1 ppm/V
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
Note
(1)
VHZ555 units are manufactured on the same production line
facilities and are subjected to all the same process and lot
control requirements imposed on RNC90Z version, as well as
all of the special screening, environmental conditioning and
documentation stipulations outlined in MIL-PRF 55182/9
(2)
TCR of ± 0.2 ppm/°C Max. is achievable per special request
FIGURE 1 - POWER DERATING CURVE
- 55 °C
+ 200
+ 70 °C Double Rated Power
Percent of Rated Power at +125 °C
+ 175
+ 150
+ 125
Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 75 - 50 - 25
Non-inductive: < 0.08 µH
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@vpgsensors.com
For better performances (values, TCR, tolerance, stability),
please contact us
0
25
50
75
100 125 150 175 200
Ambient Temperature (°C)
Compliant to RoHS directive 2002/95/EC
TABLE 2 - SPECIFICATIONS
(1)
MAXIMUM WORKING
VOLTAGE
300 V
*
(1)
RESISTANCE VALUE
100K
> 100K
AMBIENT POWER RATING
at + 70
°C
0.6 W
0.4 W
at + 125
°C
0.3 W
0.2 W
AVERAGE WEIGHT
(g)
1.4
Pb containing terminations are RoHS compliant, exemptions may apply
Resistance figures are obtained by measuring the leads at point 0.5" (12.7 mm) ±0.13" (3.2 mm) away from the root.
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
Document Number: 63063
Revision: 27-Apr-15
VHZ Hermetic (Z-Foil)
ABOUT VHZ HERMETIC
The “VHZ” series of resistors is the hermetically sealed
version of the Z201. Hermetic sealing eliminates the ingress
of both oxygen, which degrades resistors over long periods,
and moisture which degrades resistors more quickly. These
parts are made with glass to metal seal enclosures
employing Kovar eyelets which allow the copper leads to
pass through the enclosure to minimize the thermal EMF
from the lead junctions.
Rubber fill between the metal housing and resistance
element acts both as a mechanical damper and thermal
transfer path. VH102Z is the hermetically-sealed counterpart
of the Z201 high-performance molded resistors. VHZ555 is
the hermetically-sealed version of the Z555, MIL style
RNC90Z (ER).
The Vishay Foil Resistors (VFR) VHZ Series is designed and
manufactured to eliminate the inter-parameter compromise
inherent in all other types of precision resistors. All important
characteristics - tolerance, long-term shelf life and load
stability, temperature coefficient, noise, capacitance and
inductance - are optimum, approaching in total performance
the theoretical ideal, a straight wire.
VHZ was developed by VFR as a new resistor concept,
through the use of a proprietary Bulk Metal
®
Foil and new
ultra-fine photo-etching techniques created by the company,
so that the conductor can be considered a flat wire. Because
the metals used are not drawn, wound or mistreated in any
way during the manufacturing process, VHZ resistors
maintain all of their design, physical and electrical
characteristics.
The temperature coefficient of the resistor is carefully
controlled through compensation techniques to eliminate the
effect of different coefficients of expansions for all materials
used in the resistor.
FIGURE 2 - TRIMMING TO VALUES
(conceptual illustration)
FIGURE 3 - TYPICAL RESISTANCE/
TEMPERATURE CURVE (Z-FOIL)
TCR Chord Slopes for Different Temperature Ranges
+ 500
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
+ 400
+ 300
+ 200
ΔR
0
R
(ppm)
- 100
- 200
- 300
- 400
- 500
- 0.16 ppm/°C
- 55
- 25
0
+ 100
0.05 ppm/°C
- 0.1 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
+ 25
+ 60 + 75
+ 100 + 125
Note:
Foil shown in black, etched spaces in white
Ambient Temperature (°C)
POST MANUFACTURING OPERATIONS (PMO) FOR IMPROVED END OF LIFE
Many analog applications can include requirements for
performance under conditions of stress beyond the norm 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
may be harmful to other types. Short time overload,
accelerated load life, and temperature cycling are the three
PMO methods that do the most to remove the anomalies
down the road. Bulk Metal Foil resistors are inherently stable
as manufactured. These PMO methods 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
VFR applications engineering for assistance in choosing the
PMO operations that are right for their application.
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
Document Number: 63063
Revision: 27-Apr-15
VHZ Hermetic (Z-Foil)
FIGURE 4 - DIMENSIONS
Front View
L
VFR
XXXX
VH102Z
Rear View
W
100R01
0.01 %
XXXX
ST
(1)
Date Code
09
10
Year Week
LS
Lead Material #22 AWG
Round Solder Coated Copper
LL
Resistance
Value Code
Tolerance
Serial No.
(Optional Marking)
H
Model
Number
W
L
H
LL
LS
(2)
ST
Inches
0.185 max.
0.435 max.
0.430 max.
1 ± 0.125
0.150 ± 0.010
0.095 max.
mm
Notes
(1)
4.70 max.
11.05 max.
10.92 max.
25.4 ± 3.18
3.81 ± 0.25
2.41 max.
The standoffs shall be so located as to give a lead clearance of 0.010" minimum between the resistor body and the printed circuit board when
the standoffs are seated on the printed circuit board. This is to allow for proper cleaning of flux and other contaminants from the unit after all
soldering processes
For 0.200" lead spacing, specify VH102JZ or VHZ555J
Precaution in Usage:
When soldering to mount hermetically-sealed resistors on a board, keep the resistor over 0.39" (10 mm) away from
board surface by use of an insulating tube.
(2)
*
TABLE 3 - LOAD LIFE STABILITY
VH102Z/VHZ555
TYPICAL
R
LIMITS
0.3 W at + 125 °C/0.6 W at + 70 °C
2000 h
10 000 h
0.15 W at + 70 °C
2000 h
10 000 h
MAXIMUM
R
LIMITS
± 0.005 % (50 ppm)
± 0.015 % (150 ppm)
± 0.015 % (150 ppm)
± 0.05 % (500 ppm)
± 0.002 % (20 ppm)
± 0.005 % (50 ppm)
± 0.01 % (100 ppm)
± 0.015 % (150 ppm)
Document Number: 63063
Revision: 27-Apr-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
VHZ Hermetic (Z-Foil)
TABLE 4 - ENVIRONMENTAL PERFORMANCE COMPARISON
VH102Z
TYPICAL
R
Test Group I
Thermal Shock, 5 x (- 65 °C to + 150 °C)
Short Time Overload, 5 s (6.25 x rated power)
Test Group II
Resistance Temperature Characteristics
Low Temperature Storage (25 h at - 65 °C)
Low Temperature Operation
(45 min, rated power at - 65 °C)
Terminal Strength
Test Group III
DWV
Insulation Resistance
Resistance to Solder Heat , 20 s at + 260 °C
Moisture Resistance
Test Group IV
Shock
Vibration
Test Group V
Life Test at 0.3 W/+ 125 °C
2000 h
10 000 h
Test Group Va
Life test at 0.6 W (2 x rated power)/
+ 70 °C, 2000 h
Test Group VI
High Temperature Exposure
(2000 h at + 150 °C)
Test Group VII
Voltage Coefficient
< 0.00001 %/V
< 0.00001 %/V
< 0.00001 %/V
< 0.00001 %/V
± 0.05 % (500 ppm)
± 0.1 % (1000 ppm)
± 0.04 % (400 ppm)
± 0.1 % (1000 ppm)
± 0.005 % (50 ppm)
± 0.015 % (150 ppm)
± 0.005 % (50 ppm)
± 0.015 % (150 ppm)
± 0.005 % (50 ppm)
± 0.015 % (150 ppm)
± 0.015 % (150 ppm)
± 0.05 % (500 ppm)
± 0.005 % (50 ppm)
± 0.015 % (150 ppm)
± 0.015 % (150 ppm)
± 0.05 % (500 ppm)
± 0.002 % (20 ppm)
± 0.002 % (20 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.002 % (20 ppm)
± 0.002 % (20 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.005 % (50 ppm)
40 x
10
5
M
± 0.002 % (20 ppm)
± 0.005 % (50 ppm)
± 0.01 % (100 ppm)
40 x
10
5
M
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.002 % (20 ppm)
40 x
10
5
M
± 0.002 % (20 ppm)
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
40 x 10
5
M
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
See table 1
± 0.005 % (50 ppm)
± 0.005 % (50 ppm)
± 0.002 % (20 ppm)
See table 1
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
See table 1
± 0.0025 % (25 ppm)
± 0.005 % (50 ppm)
± 0.002 % (20 ppm)
See table 1
± 0.005 % (50 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.002 % (20 ppm)
± 0.003 % (30 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
± 0.002 % (20 ppm)
± 0.003 % (30 ppm)
± 0.01 % (100 ppm)
± 0.01 % (100 ppm)
MAXIMUM
R
TYPICAL
R
VHZ555
MAXIMUM
R
TABLE 5 - EXAMPLES OF NON-STANDARD REQUIREMENTS
TYPE
VALUE
4R
7R68
VH102Z
10R
16R
39R20
Note
(1)
(1)
TOLERANCE
0.05 %
0.05 %
0.01 %
0.005 %
0.005 %
PMO is optional for improved stability
www.vishayfoilresistors.com
4
For any questions, contact
foil@vpgsensors.com
Document Number: 63063
Revision: 27-Apr-15
VHZ Hermetic (Z-Foil)
TABLE 6 - GLOBAL PART NUMBER INFORMATION
DENOTES PRECISION
Y
VALUE
R
=
K
= k
(1)
NEW GLOBAL PART NUMBER: Y5077250R000V9L (preferred part number format)
CHARACTERISTICS
0
= standard
9
= lead (Pb)-free
1 to 999
= custom
Y
5
0
7
7
2
5
0
R
0
0
0
V
9
L
PRODUCT CODE
5077
= VH102Z
1635
= VHZ555
0784
= VH102JZ
0783
= VHZ555J
RESISTANCE TOLERANCE
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
FOR EXAMPLE: ABOVE GLOBAL ORDER Y5077 250R000 V 9 L:
TYPE: VH102Z
VALUE: 250.0
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk
HISTORICAL PART NUMBER: VH102Z T 250R00 V B (will continue to be used)
VH102Z
MODEL
VH102Z
VHZ555
T
TERMINATION
T
= lead (Pb)-free
None = tin/lead
250R00
OHMIC VALUE
250.0
V
T
Q
A
B
C
D
F
V
ABS. TOLERANCE
= ± 0.005 %
= ± 0.01 %
= ± 0.02 %
= ± 0.05 %
= ± 0.1 %
= ± 0.25 %
= ± 0.5 %
= ± 1.0 %
B
PACKAGING
B
= bulk
Note
(1)
For non-standard requests, please contact application engineering
Document Number: 63063
Revision: 27-Apr-15
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
5
