Vishay has introduced the H and HZ, a two new series of
hermetically sealed, oil-filled Bulk Metal Foil resistors,
which are suitable for the resistor applications such as
resistance standards, feedback devices for operational amplifiers,
precision voltage dividers, meter multipliers, precision
bridge resistors, and decade voltage dividers.
The new H and HZ series resistors feature tolerances of
0.001 % (10 ppm), a resistance range of 5 Ohm to 1.84 MOhm,
shelf-life stability of 2 ppm (±0.0002 %) for at
least 6 years (unaffected by humidity), and a rise time
of < 1 ns. Maximum TCR ranges from ± 2 ppm/°C
for the H series to ± 0.2 ppm/°C for the Z-Foil
HZ series.
The hermetic sealing eliminates the ingress of moisture
and oxygen, while the oil acts as a thermal conductor, thus
eliminating the 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 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.
The "H" family devices are also 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), such as temperature cycling, short-time overload,
and accelerated load life, which are applicable to Bulk
Metal Foil resistors, and minimizes the thermal EMF at the
internal termination-to-resistor junction assembly.
"H" family devices also feature a electrostatic
discharge protection up to 25 kV, a rise time of 1 ns, with
essentially no ringing, current noise of < - 40 dB, thermal
EMF of 0.05 µV/°C typical, and a voltage coefficient
of < 0.1 ppm/V.
Device Specification Table:
| Specification |
H Series |
HZ Series (Z-Foil) |
| Typical TCR |
± 2 ppm |
± 0.2 ppm |
| Standard resistance range (higher/lower values available) |
5 Ohm to 1.84 MOhm |
5 Ohm to 1.1 MOhm |
Availability: Now
For more details visit www.vishay.com
