HTHG (Z1 Foil Technology)
Ultra High Precision Z1 Foil Technology
Ultra High Precision Z1 Foil Technology Gold Wire Bondable Chip Resistor
Gold Wire Bondable Chip Resistor
for Hybrid Circuits and High Temperature Applications
up to +240°C, Long-Term Stability of 0.05%
FEATURES
• Temperature coefficient of resistance (TCR):
±3 ppm/°C typical (–55°C to +220°C, +25°C ref.)
• Resistance range: 5 Ω to 100 kΩ (for higher or lower
values, please contact us)
• Resistance tolerance: to ±0.02%
•
Connection method: gold wire bonding
•
Working power: to 150 mW at +220°C
•
Long-term stability: to ±0.05% at +240°C for
2000 h, no power
•
Load-life stability: to 0.05% at +220°C for 2000 h at
working power
• Bulk Metal
®
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)
• Thermal stabilization time <1 s (nominal value achieved
within 10 ppm of steady state value)
• Electrostatic discharge (ESD) at least to 25 kV
• Non inductive, non capacitive design
• Rise time: 1 ns effectively no ringing
• Current noise: 0.010 μV
RMS
/Volt of applied voltage
(<–40 dB)
• Non inductive: <0.08 μH
• Non hot spot design
• Terminal finish: gold plated (lead (Pb)-free alloy)
• Prototype quantities available, please contact
foil@vpgsensors.com
Figure 1 – Typical Power Derating Curve
Percent of Rated Power
100
75
50
25
0
-75
+240
+75 +100 +125 +150 +175 +200 +225 +250
-55°C
+70°C
-50
-25
0
+25
+50
Ambient Temperature (°C)
INTRODUCTION
Vishay Foil Resistors HTHG series consists of Bulk Metal
®
Z1 Foil Technology hybrid chip resistors, connected using
gold wire bonding. The HTHG series features two different
layouts of chip designs according to the sizes (see figure
3 and table 4). These new types of hybrid chips were
especially designed for high temperature applications up
to +240°C
(1)
(working power: to 150 mW at +220°C), and
include gold plated terminals.
The HTHG series is available in any value within the
specified resistance range. Our application engineering
department is available to advise and make
recommendations.
For customized technical requirements and special
applications, please contact
foil@vpgsensors.com.
Table 1 – Tolerance and TCR vs. Resistance
Value
(1)(2)
(–55°C To +220°C, +25°C Ref.)
RESISTANCE
VALUE
(Ω)
100 to 100K
50 to <100
25 to <50
10 to <25
5 to 10
TOLERANCE
(%)
±0.02
±0.05
±0.1
±0.25
±0.5
±3
TCR Typical
(ppm/°C)
Notes
(1)
Performances obtained with ceramic PCB.
(2)
For tighter performances or different values, please contact
our application engineering at foil@vpgsensors.com.
Note
* This datasheet provides information about parts that are RoHS-compliant and/or parts that are non-RoHS-compliant. For example,
parts with lead (Pb) terminations are not RoHS compliant. Please see the information/tables in this datasheet for details.
Document No.: 63221
Revision: 09-Jul-2018
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
HTHG (Z1 Foil Technology)
HIGH TEMPERATURE AND HIGH PRECISION
Resistors are the passive building blocks of an electrical
circuit. They may be used for dropping the voltage,
buffering the surge when the circuit is turned on, providing
feedback in a monitoring loop, sensing current flow, etc.
When the application requires stability over time and load,
initial accuracy, minimal change with temperature for
more than 200°C, resistance to moisture and a number
of other characteristics that will be described, only Bulk
Metal
®
Z1 Foil Technology resistors have the attributes
needed for this application. Many analog circuits for
industrial, military, aerospace, medical, down-hole, oil well
and automotive applications require passive components,
such as resistors, to have a minimal drift from their initial
values when operating above +175°C and in humid
environments. In these applications, the most important
factor is the end of life tolerance (which is part of the
stability) and to a lesser extent, the initial tolerance.
The HTHG series resistors provide stabilities well under
the maximum allowable drift required by industrial
specifications through thousands of hours of operation
under harsh conditions, such as the extreme temperatures
and radiation-rich environments of down-hole oil-well
logging applications in the frigid arctic, under the sea or
in deep space. Bulk Metal Z1 Foil Technology resistors
receive stabilization processing, such as repetitive
short-term power overloads, to assure reliable service
through the unpredictable stresses of extreme operation.
Compared to Bulk Metal Foil, thick and thin film resistor
elements are produced with a non-controllable material.
Heat or mechanical stresses on the resistive elements
cause the particles forming the film to expand. However,
after these stresses are alleviated, the particles in the film
matrix do not return to the exact original position. That
degenerates their overall stability.
Ultra high precision Bulk Metal Foil technology includes
many types of resistors with a variety of standard
configurations that can withstand unconventional
environmental conditions above and below the earth’s
surface using special post manufacturing operations
specially developed for this purpose. The stability of a
resistor depends primarily on its history of exposures to
high temperature. Stability is affected by:
1. Changes in the ambient temperature and heat from
adjacent components (defined by the temperature
coefficient of resistance, or TCR)
2. Destabilizing thermal shock of suddenly-applied
power (defined by the power coefficient of resistance,
or PCR)
3. Long-term exposure to applied power
(load-life stability)
4. Repetitive stresses from being switched on and off
In very high-precision resistors that need to operate in
an environment with temperatures above +175°C, these
effects must be taken into account to achieve high
stability with changes in load (Joule effect) and ambient
temperature.
The Bulk Metal Foil resistors’ Z1 Foil Technology provides
an order of magnitude reduction in the Bulk Metal Foil
element’s sensitivity to temperature changes – both
external and internal – with emphasis on long-term
stability in high temperature environments.
In order to take full advantage of the low TCR and long-
term stability improvement, it is necessary to take into
account the differences in the resistor’s response to each
of the above-mentioned effects. For high temperature
applications where stability and total error budget is the
main concern, the Bulk Metal Z1 Foil Technology offers
the best resilience against time at elevated temperature.
The Bulk Metal Foil technology allows us to produce
customer-oriented products designed to satisfy unique
and specific technical requirements. In addition to the
special chip stabilization under extreme environment
conditions in the production line, we offer additional
specially oriented post manufacturing operations (PMO)
for high temperature applications that require an even
higher degree of reliability and stability.
Electrostatic Discharge (ESD) is another potential problem
that can cause unpredictable failure in high temperature
applications that increase the sensitivity of the resistors to
ESD.
ESD damage to electronic devices can occur at any
point in the device’s life cycle, from manufacturing to
field service. A resistor that is exposed to an ESD event
may fail immediately or may experience a latent defect.
With latent defects, premature failure can occur after
the resistor is already functioning in the finished product
after an unpredictable length of service. Bulk Metal
Foil resistors are capable of withstanding electrostatic
discharges at least to 25 kV volts without degradation.
Vishay Foil Resistors’ Application Engineering department
is always available to assist with any special requirements
you might have. If you are not sure which resistor best
suits your needs, please do not hesitate to contact them
for more information:
foil@vpgsensors.com
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
Document No.: 63221
Revision: 09-Jul-2018
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