H Series (Z-Foil)
Vishay Foil Resistors
Hermetically sealed Ultra High Precision Z-Foil Technology
Resistors with TCR of 0.05 ppm/°C, Tolerance of 0.001 % and
Load Life Stability of 0.005 %
www.vishay.com For technical questions, contact: foil@vishay.com Document Number: 63120
1Revision: 27-Nov-06
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NEW PRODUCT
Any value available within resistance range
INTRODUCTION
The Z-Foil based oil filled, hermetically sealed H-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
H-series resistors become the most precise and stable
resistors available.
With accuracies of 0.001 % and a resistance range from 5 Ω
to 1.1 MΩ 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.
Note
* For lower TCR and for selected TCR tracking, please contact us
FEATURES
•Temperature Coefficient of Resistance (TCR):
0.05 ppm/°C (0 °C to 60 °C)
•Power Coefficient “ΔR due to self heating”:
5 ppm at rated power
•Tolerance: to 0.001 %
•Load Life Stability: 0.005 % (70 °C for 2000 hours at
rated power)
•Electrostatic Discharge (ESD) > 25 000 Volts
•Resistance Range: 5 Ω to 1.1 MΩ (higher or lower values
of resistance available)
•Power Rating: 0.3 to 2.5 Watts at + 25 °C (depending on
model - see Table 2)
•Shelf Life Stability: 2 ppm for at least 10 years
•Non Inductive, Non Capacitive design
•Non hot spot design
•Rise Time: 1.0 ns without ringing
•Current Noise: < - 40 dB
•Thermal EMF: 0.05 µV/°C typical
•Voltage Coefficient: < 0.1 ppm/V
•Non Inductive: < 0.08 µH
•Terminal Finishes available:
Lead (Pb)-free
Tin/Lead Alloy
•Impervious to harmful environments - oil filled
•For better performances, please contact us
TABLE 1 - TOLERANCE AND TCR VERSUS
RESISTANCE VALUE
RESISTANCE VALUE
(Ω)
TYPICAL TCR AND MAX.
SPREAD (MIL RANGE)
(ppm/°C)*
100 to < 1M1 ± 0.2 ± 2
50 to < 100 ± 0.2 ± 3
5 to < 50 ± 0.2 ± 4
FIGURE 1 - TRIMMING TO VALUES
(Conceptual Illustration)
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before 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
Current Path
After Trimming
Interloop Capacitance
Reduction in Series
Document Number: 63120 For technical questions, contact: foil@vishay.com www.vishay.com
Revision: 27-Nov-06 2
H Series (Z-Foil)
Hermetically sealed Ultra High Precision Z-Foil
Technology Resistors with TCR of 0.05 ppm/°C,
Tolerance of 0.001 % and Load Life Stability of 0.005 %
Vishay Foil Resistors
SALES
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• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
NEW PRODUCT
Notes
* Available in a 4-lead terminal
** 0.375 H available
See next page for numbered footnotes
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE
(
Ω
)
STANDARD RESISTANCE
TOLERANCE
MAXIMUM
WORKING
VOLTAGE2)
POWER
RATING
at + 25 °C
AVERAGE
WEIGHT IN
GRAMS
CONSTRUCTION
BRIEF
DIMENSIONS
3)
TIGHTEST
(
Ω
)
LOOSEST
(%)
INCHES mm
VHP202Z 10 to 66k
66K to 100K
300 0.3 W
0.2 W
1.4 Oil-filled, tinned
copper leads, nickel
shell, kovar and
glass header
W: 0.185 ± 0.020
L: 0.435 ± 0.020
H: 0.430 ± 0.020**
LL: 1.000 ± 0.125
LS: 0.150 ± 0.010
4)
ST: 0.095 Max
4.70 ± 0.51
11.05 ± 0.51
10.92 ± 0.51
25.4 ± 3.18
3.81 ± 0.25
2.41 Max
VHA412Z 10 to 66K
66K to 100K
250 0.3 W
0.2 W
4.6
Oil-filled,
tinned copper
leads, tinned brass
shell, kovar and
glass end bells
L: 0.625 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 Min
15.88 ± 0.79
9.53 ± 0.79
25.4 Min
VHA414Z 5 to 120K
> 120K to 200K
1K to
1)
500 to < 1K
50 to < 500
30 to < 50
20 to < 30
10 to < 20
5 to < 10
± 0.001 ± 0.1
± 0.0025 ± 0.1
± 0.005 ± 0.1
± 0.01 ± 0.1
± 0.02 ± 0.1
± 0.05 ± 0.1
± 0.1 ± 0.1
350 0.5 W
0.3 W
7.3 L: 1.000 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 Min
25.4 ± 0.79
9.53 ± 0.79
25.4 Min
VHA512Z* 5 to 180K
180K to 300K
350 0.75 W
0.4 W
6.3 L: 0.625 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 Min
15.88 ± 0.79
12.7 ± 0.79
25.4 Min
VHA516-4Z*
VHA516-5Z*
VHA516-6Z*
5 to 240K
> 240K to 400K
5 to 300K
> 300K to 500K
5 to 360K
> 360K to 600K
500 1.0 W
0.5 W
1.25 W
0.6 W
1.5 W
0.7 W
9.2 L: 1.000 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 Min
25.4 ± 0.79
12.7 ± 0.79
25.4 Min
VHA518-7Z*
VHA518-8Z*
VHA518-9Z*
VHA518-10Z*
VHA518-11Z*
5 to 420K
> 420K to 700K
5 to 480K
> 480K to 800K
5 to 540K
> 540K to 900K
5 to 600K
> 600K to 1.0M
5 to 660K
> 660K to 1.1M
600 1.75 W
0.8 W
2.0 W
0.9 W
2.25 W
1.0 W
2.5 W
1.1 W
2.5 W
1.2 W
13.5 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 2 - TYPICAL TCR CURVE Z-FOIL
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C)
∆R
R
(ppm)
0
0.05 ppm/°C
- 0.1 ppm/°C 0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
- 0.16 ppm/°C
- 400
+ 300
+ 400
FIGURE 3 - POWER DERATING CURVE
+ 100
+ 75
+ 50
+ 25
0
- 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175
Percent of Rated Power
- 55 °C
Ambient Temperature (°C)
H Series (Z-Foil)
Vishay Foil Resistors Hermetically sealed Ultra High Precision Z-Foil
Technology Resistors with TCR of 0.05 ppm/°C,
Tolerance of 0.001 % and Load Life Stability of 0.005 %
www.vishay.com For technical questions, contact: foil@vishay.com Document Number: 63120
3Revision: 27-Nov-06
SALES
• AMERICAS: foilsales.usa@vishay.com • ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com
• GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com • FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com • ISRAEL: foilsales.israel@vishay.com
NEW PRODUCT
Example:
VHP202Z 120K50 TVB
Model: VHP202Z
Value: 120.5 kΩ
Termination: Lead (Pb)-free
Tolerance: 0.005 %
Packaging: Bulk Pack
Notes
1. Upper end of resistance range varies with model selected (i.e. VHP202; the range is to 150 k
Ω
; VHA518-10, the range is to 1.0 M
Ω
) per Table 2
2. Not to exceed power rating of resistor
3. Insulating sleeve - a special case insulating plastic sleeve is available on VHA models - specify letter “P” as a suffix to model number
(i.e. VHA412P)
4. 0.200
"
(5.08 mm) lead spacing available - specify VH202J
5. Inductance (L) due mainly to the leads
6. The resolution limit of existing test equipment (within measurement capability of the equipment, or “essentially zero”)
7. µV/° relates to EMF due to lead temperature difference and µV/watt due to power applied to the resistor
8. Load life
Δ
R max. can be reduced through burn-in procedure
TABLE 3 - “H” SERIES SPECIFICATIONS
Stability8)
Load Life at 2000 hrs. ± 0.002 % maximum ΔR at 0.1 Watt per chip and at + 60 °C
Shelf Life ± 2 ppm (0.0002 %) after at least 10 years
Current Noise < 0.010 µV (RMS)/Volt of applied voltage (- 40 dB)
High Frequency Operation
Rise/Decay Time 1.0 ns at 1 kΩ
Inductance (L)5) 0.1 µH maximum; 0.08 µH typical
Capacitance (C) 1.0 pF maximum; 0.5 pF typical
Voltage Coefficient < 0.1 ppm/V6)
Thermal EMF7) 0.1 µV/°C maximum; 0.05 µV/°C typical; 1 µV/Watt maximum
Hermeticity 10-7 Atmospheric cc/sec maximum
TABLE 4 - ORDERING INFORMATION
MODEL RESISTANCE
RESISTANCE VALUE PLATING OF
TERMINATIONS
ABSOLUTE
TOLERANCE PACK AGING
LETTER
DESIGNATOR
MULTIPLIER
FACTOR
VHP202Z
5 Ω to < 1 kΩ
100R01 = 100.01 ΩRx 1.0
T = Lead (Pb)-free
None = Tin/Lead
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 = Bulk Pack
1 kΩ to < 1 MΩ
15K231 = 15.231 ΩKx 10
3
1 MΩ to < 1.1 MΩ
1M1000 = 1.1 MΩMx 10
6
Legal Disclaimer Notice
Vishay
Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
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