H Series
Vishay Foil Resistors
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 %
www.vishay.com For any questions, contact: foil@vishay.com Document Number: 63006
2 Revision: 14-Nov-07
Notes
* Available in a 4-lead terminal
** 0.375 H available
See next page for numbered footnotes
FIGURE 2 - 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
FIGURE 3 - FOIL RESISTOR TYPICAL
TCR CURVE
- 50 - 25 0 + 25 + 50 + 75 + 100 + 125
- 55
2 ppm/°C
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
(ppm)
Δ
R
R
Temperature (°C)
C Alloy 2 ppm/°C
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE
(
Ω
)
STANDARD RESISTANCE
TOLERANCE
MAXIMUM
WORKING
VOLTAGE
2)
POWER
RATING
at + 25 °C
AVERAGE
WEIGHT
(g)
CONSTRUCTION
BRIEF
DIMENSIONS
3)
TIGHTEST
(
Ω
)
LOOSEST
(%)
INCHES mm
VHP202
5 to 100K
> 100K to 150K
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
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.
VHA412
5 to 100K
> 100K to 150K
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.
VHA414
5 to 200K
> 200K to 335K
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.
VHA512*
5 to 300K
> 300K to 500K
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.
VHA516-4*
VHA516-5*
VHA516-6*
5 to 400K
> 400K to 668K
5 to 500K
> 500K to 835K
5 to 600K
> 600K to 1M
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.
VHA518-7*
VHA518-8*
VHA518-9*
VHA518-10*
VHA518-11*
5 to 700K
> 700K to 1M17
5 to 800K
> 800K to 1M34
5 to 900K
> 900K to 1M5
5 to 1.0M
> 1.0M to 1M67
5 to 1.0M
> 1.0M to 1M84
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.
