H Series
Vishay Foil Resistors
New Generation of Secondary Standards Hermetically Sealed High Precision Bulk
Metal
®
Foil Technology Resistors with TCR of ± 2 ppm/°C, Tolerance of ± 0.001 % and
Load Life Stability of ± 0.005 % (Metrology, Laboratory, Instrumentation, Industrial)
FEATURES
•
Temperature coefficient of resistance (TCR):
± 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
Ω
to 1.84 MΩ (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 rating: 0.3 W to 2.5 W at + 25 °C (depending on
model - see table 2)
•
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 improved
through in-house stabilization
•
Shelf life stability: ± 2 ppm for at least 6 years
(unaffected by humidity)
•
Electrostatic discharge (ESD) up to 25 000 V
•
Rise time: 1 ns effectively no ringing
•
Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•
Current noise: 0.010 µV
RMS
/V of applied voltage (< - 40 dB)
•
Thermal EMF: 0.05 µV/°C typical
•
Voltage coefficient: < 0.1 ppm/V
•
Non-inductive: < 0.08 µH
•
Non-inductive, non-capacitive design
•
Non hot spot design
•
Terminal finish available: lead (Pb)-free or tin/lead alloy
•
Impervious to harmful environments - oil-filled
•
Compliant to RoHS directive 2002/95/EC
•
Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
•
For better performances (values, TCR, tolerance, stability),
please see the HZ series
INTRODUCTION
The H series resistors are oil-filled, hermetically sealed ultra
precision resistors and are used as secondary standards for
metrology applications.
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.
Vishay’s Bulk Metal
®
Foil outperforms all other resistor
technologies available today for applications that require
precision and stability. 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 %, a resistance range from 5
Ω
to 1.84 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.
The H series is 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). (Please refer to the last page)
TABLE 1 - TCR VS. RESISTANCE VALUE
RESISTANCE
VALUE (Ω)
100 to < 1M84
50 to < 100
5 to < 50
TYPICAL TCR AND MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C ref.)
(ppm/°C)
± 2 ± 2.5
± 2 ± 3.5
± 2 ± 4.5
FIGURE 1 - SHELF LIFE - VHA518-11
12K9 VS. QHE
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
- 0.1
0
100 200 300 400 500 600 700 800 900 1000
Note
• For maximum TCR < 1 ppm/°C, see VHP100 and contact
application engineering
* Pb containing terminations are not RoHS compliant, exemptions may apply
Resistance Change (ppm)
Time (Days)
Document Number: 63006
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
H Series
Vishay Foil Resistors
FIGURE 2 - POWER DERATING CURVE
Percent of Rated Power
+ 100
+ 75
+ 50
+ 25
0
- 50
- 25
0
+ 25 + 50 + 75 + 100 + 125 + 150 + 175
- 55 °C
Ambient Temperature (°C)
FIGURE 3 - TRIMMING TO VALUES
(Conceptual Illustration)
FIGURE 4 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
+ 150
+ 100
Interloop Capacitance
Reduction in Series
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Δ
R
+ 50
C Alloy 2 ppm/°C
0
R
(ppm)
Mutual Inductance
Reduction due
to Change in
Current Direction
- 50
- 100
- 150
- 200
- 55
- 25
0
+ 25
+ 50
+ 75
+ 100
2 ppm/°C
+ 125
Ambient Temperature (°C)
Note:
Foil shown in
black,
etched spaces in
white
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
STANDARD RESISTANCE
RESISTANCE TOLERANCE PER RANGE MAXIMUM POWER AVERAGE
CONSTRUCTION
WORKING
RANGE
BRIEF
VOLTAGE RATING WEIGHT
TIGHTEST
RANGE
(Ω)
at + 25 °C
(g)
(2)
(Ω)
(%)
5 to 100K
> 100K to 150K
0.3 W
0.2 W
Oil-filled, tinned
copper leads, nickel
shell, kovar and
glass header
DIMENSIONS
(3)
INCHES
W: 0.162 ± 0.020
L: 0.415 ± 0.020
H: 0.430 ± 0.020**
LL: 1.000 ± 0.125
LS: 0.150 ± 0.010
(4)
ST: 0.095 max.
L: 0.625 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 min.
L: 1.000 ± 0.031
D: 0.375 ± 0.031
LL: 1.000 min.
L: 0.625 ± 0.031
D: 0.500 ± 0.031
LL: 1.000 min.
mm
4.11 ± 0.51
10.54 ± 0.51
10.92 ± 0.51
25.4 ± 3.18
3.81 ± 0.25
2.41 max.
15.88 ± 0.79
9.53 ± 0.79
25.4 min.
25.4 ± 0.79
9.53 ± 0.79
25.4 min.
15.88 ± 0.79
12.7 ± 0.79
25.4 min.
25.4 ± 0.79
12.7 ± 0.79
25.4 min.
VHP202
300
1.4
VHA412
VHA414
VHA512*
VHA516-4*
5 to 100K
> 100K to 150K
5 to 200K
> 200K to 335K
5 to 300K
> 300K to 500K
1K to
(1)
250
± 0.001
± 0.0025
± 0.005
± 0.01
± 0.02
± 0.05
± 0.1
500
350
350
0.3 W
0.2 W
0.5 W
0.3 W
0.75 W
0.4 W
1.0 W
0.5 W
1.25 W
0.6 W
1.5 W
0.7 W
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
4.6
7.3
6.3
500 to < 1K
50 to < 500
30 to < 50
20 to < 30
10 to < 20
5 to < 10
5 to 400K
> 400K to 668K
VHA516-5* 5 to 500K 835K
> 500K to
VHA516-6* 5 to 600K 1M
> 600K to
VHA518-7* 5 to 700K 1M17
> 700K to
VHA518-8* 5 to 800K 1M34
> 800K to
VHA518-9* 5 to 900K 1M5
> 900K to
VHA518-10* 5 to 1.0M 1M67
> 1.0M to
VHA518-11* 5 to 1.0M 1M84
> 1.0M to
9.2
Oil-filled,
tinned copper leads, L: 1.000 ± 0.031
tinned brass shell, D: 0.500 ± 0.031
LL: 1.000 min.
kovar and
glass end bells
600
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.
Notes
* Available in a 4-lead terminal
** 0.375 H available
See next page for numbered footnotes
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2
For any questions, contact:
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Document Number: 63006
Revision: 23-Mar-10
H Series
Vishay Foil Resistors
FIGURE 5 - STANDARD IMPRINTING AND DIMENSIONS
Front View
L
VISHAY
XXXX
VHP202
Rear View
W
100R01
0.01%
XXXX
ST
Date Code
07
06
Year
Week
LS
LL
Lead Material
#22 AWG Round
Solder Coated Copper
Model
No.
VHA412
100R01 0.005%
Lead Material #22 AWG
Round Solder Coated Copper
Resistance
Value
Code
Tolerance
Serial
No.
Date Code
07
10
Year
Week
L
LL
D
VISHAY
XXXX
H
Model
Number
Resistance
Value
Code
Tolerance
TABLE 3 - “H” SERIES SPECIFICATIONS
Stability
(8)
Load life at 2000 h
Shelf life
Current Noise
High Frequency Operation
Rise time
Inductance (L)
(5)
Capacitance (C)
Voltage Coefficient
Thermal EMF
(7)
Hermeticity
1.0 ns without ringing
0.1 µH maximum; 0.08 µH typical
1.0 pF maximum; 0.5 pF typical
< 0.1 ppm/V
(6)
0.1 µV/°C maximum; 0.05 µV/°C typical; 1 µV/W maximum
10
-7
atmospheric cc/s maximum
± 0.002 % (20 ppm) at 25 °C at rated power
± 2 ppm (0.0002 %) for at least 6 years
< - 40 dB
Notes
(1)
Upper end of resistance range varies with model selected (i.e. VHP202; the range is to 150 kΩ; VHA518-10, the range is to 1M67
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. See table 4 for instructions on how to specify
(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/°C relates to EMF due to lead temperature difference and µV/W due to power applied to the resistor
(8)
Load life
ΔR
maximum. Can be reduced through in-house oriented processes
POST MANUFACTURING OPERATIONS OR PMO FOR IMPROVED END OF LIFE
Many analog applications can include requirements for
performance under conditions of stress beyond the normal
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 are harmful to other types. Short time overload,
Document Number: 63006
Revision: 23-Mar-10
accelerated load life, and temperature cycling are the three
PMO exercises that do the most to remove the anomalies
down the road. Vishay Bulk Metal Foil resistors are
inherently stable as manufactured. These PMO exercises
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 Vishay Foil applications
engineering for assistance in choosing the PMO operations
that are right for their application.
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
3
H Series
Vishay Foil Resistors
TABLE 4 - GLOBAL PART NUMBER INFORMATION
(1)
NEW GLOBAL PART NUMBER: Y0019120K500V9L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
Ω
K
= kΩ
M
= MΩ
CHARACTERISTICS
0
= standard
1
= tin/lead with plastic sleeve
9
= lead (Pb)-free
19
= lead (Pb)-free with plastic sleeves
2 to 999
= custom
Y
0
0
1
9
1
2
0
K
5
0
0
V
9
L
PRODUCT CODE
0024
= VHP202 and VH202C
0019
= VHA412
0025
= VHA414
0023
= VHA512
1725
= VHA512 (4-terminals)
0104
= VHA516-4
1726
= VHA516-4 (4-terminals)
0105
= VHA516-5
1727
= VHA516-5 (4-terminals)
0106
= VHA516-6
1728
= VHA516-6 (4-terminals)
0107
= VHA518-7
1729
= VHA518-7 (4-terminals)
0108
= VHA518-8
1730
= VHA518-8 (4-terminals)
0109
= VHA518-9
1731
= VHA518-9 (4-terminals)
0110
= VHA518-10
1732
= VHA518-10 (4-terminals)
0111
= VHA518-11
1733
= VHA518-11 (4-terminals)
RESISTANCE TOLERANCE
S
= ± 0.001 %
U
= ± 0.002 %
X
= ± 0.0025 %
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 pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0019 120K500 V 9 L:
TYPE: VHA412
VALUE: 120.5 kΩ
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER: VHA412T 120K50 V B (will continue to be used)
VHA412
MODEL
VHP202 and VH202C
VHA412
VHA414
VHA512
(2)
VHA516-4
(2)
VHA516-5
(2)
VHA516-6
(2)
VHA518-7
(2)
VHA518-8
(2)
VHA518-9
(2)
VHA518-10
(2)
VHA518-11
(2)
Notes
(1)
(2)
T
TERMINATION
T
= lead (Pb)-free
None
= tin/lead
PLASTIC SLEEVE
P
= plastic sleeve
None
= standard
120K50
OHMIC VALUE
120K50
= 120.5 kΩ
V
TOLERANCE
S
= ± 0.001 %
U
= ± 0.002 %
X
= ± 0.0025 %
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
PACKAGING
B
= bulk pack
For non-standard requests, please contact application engineering
4-terminal construction of these types are available, please quote:
2-Terminal
4-Terminal
VHA512
302073
VHA516-4
302074-4
VHA516-5
302074-5
VHA516-6
302074-6
VHA518-7
302075-7
VHA518-8
302075-8
VHA518-9
302075-9
VHA518-10
302075-10
VHA518-11
302075-11
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4
For any questions, contact:
foil@vishaypg.com
Document Number: 63006
Revision: 23-Mar-10
H Series
Vishay Foil Resistors
ULTRA HIGH PRECISION HERMETICALLY
SEALED RESISTORS
INTRODUCTION
The response of Vishay's hermetically sealed resistors under
variable conditions and stresses can be made better by
additional in-house oriented processes (PMO). Processes
such as short time overload, accelerated load life and
temperature cycling produce enhanced levels of accuracy,
stability and speed, offering immediate answers to many
resistor applications currently believed unsolvable, and
opens entirely new areas of design where the use of
resistors had not been considered.
APPLICATIONS INCLUDE
•
Resistance standards
•
Feedback devices for operational amplifiers
•
Precision voltage dividers
•
Meter multipliers
•
Precision bridge resistors
•
Decade voltage dividers
See table 5 for the improvement to expect in hermetically
sealed parts when calling for Vishay in-house oriented
processes (PMO).
TABLE 5 - EXAMPLES OF NON-STANDARD REQUIREMENTS
TYPE
VHA518-11 Set of 10 Resistors
(+ 20 °C to + 30 °C)
VALUE
1
Ω
10
Ω
100
Ω
VHA518-7 4-Terminal (+ 20 °C to + 30 °C)
120
Ω
1K
10K
100K
10
Ω
100
Ω
VHA518-7 4-Terminal Matched Pairs
(+ 20 °C to + 30 °C)
1K
10K
100K
VHA518 Set of 10 Resistors
(+ 18 °C to + 28 °C, + 23 °C ref.)
999Ω475
TOLERANCE
ABSOLUTE
0.1 %
0.05 %
0.01 %
0.005 %
0.005 %
0.001 %
0.001 %
0.05 %
0.01 %
0.005 %
0.001 %
0.001 %
0.05 %
MATCH
0.005 %
-
-
-
-
-
-
0.02 %
0.01 %
0.002 %
0.002 %
0.002 %
0.005 %
TCR
ABSOLUTE
0.5 ppm/°C
0.5 ppm/°C
0.5 ppm/°C
0.4 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
0.5 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
TRACKING
0.5 ppm/°C
-
-
-
-
-
-
0.5 ppm/°C
0.5 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.3 ppm/°C
0.5 ppm/°C
with PMO
with PMO
with PMO
REMARKS
with PMO
ORDERING INFORMATION
Resistors are built to your requirements. Send your schematic and electrical requirements to the applications engineering
department at
foil@vishaypg.com.
A unique part number will be assigned which defines all aspects of your resistor.
Document Number: 63006
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
5
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