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. ꢁꢁmꢂ/C, Tolerance of ꢀ0ꢀꢀꢃ ꢄ
and Load Life Stability of ꢀ0ꢀꢀ. ꢄ (Metrology, Laboratory, Instrumentation, Industrial)
FEATURES
Temꢁerature 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 imꢁroved
through in-house stabilization
Shelf life stability: . ꢁꢁm for at least 6 years
(unaffected by humidity)
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 ꢁrecise and stable
resistors available. They are used as the most precise
secondary standards for ultra precision metrology.
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 µVRMS/V of applied voltage (< - 40 dB)
Thermal EMF: 0.05 µV/°C typical
Voltage coefficient: < 0.1 ppm/V
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.
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
The HZ Series is available with laboratory and metrology
level ꢁrecision and long-term stability with additional
in-house oriented ꢁrocesses such as: chiꢁ stabilization,
sꢁecial TCR ꢁlotting, additional treatments for ultra
stability and sꢁecial ꢁost manufacturing oꢁerations
(PMO)0 (Please refer to the last ꢁage)
For better performances (values, TCR, tolerance, stability),
please contact us
TABLE 1 - TCR VS. RESISTANCE VALUE
FIGURE 1 - SHELF LIFE - VHA518-11
12K9 VS. QHE
TYPICAL TCR AND
RESISTANCE VALUE
MAX0 SPREAD
(- 55 /C to + ꢃ.5 /C, + .5 /C ref0)
(ꢁꢁmꢂ/C)
ꢃ
ꢀ09
ꢀ08
ꢀ07
ꢀ06
ꢀ05
ꢀ04
ꢀ03
ꢀ0.
ꢀ0ꢃ
ꢀ
()
100 to < 1M1
50 to < 100
5 to < 50
0.2
0.2
0.2
2
3
4
Note
• For maximum TCR < 1 ppm/°C, see VHP100 and contact
application engineering
- ꢀ0ꢃ
ꢀ
ꢃꢀꢀ .ꢀꢀ 3ꢀꢀ 4ꢀꢀ 5ꢀꢀ 6ꢀꢀ 7ꢀꢀ 8ꢀꢀ 9ꢀꢀ ꢃꢀꢀꢀ
Time (Days)
Document Number: 63120
Revision: 25-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
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