HZ Series (Z-Foil) with Zero TCR
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63120
2 Revision: 25-Mar-10
Notes: *Available in a 4-lead terminal **0.375 H available - See next page for numbered footnotes
FIGURE 2 - TRIMMING TO VALUES (Conceptual Illustration)
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE
(
)
STANDARD RESISTANCE
TOLERANCE PER RANGE
MAXIMUM
WORKING
VOLTAGE
(2)
POWER
RATING
at + 25 °C
AVERAGE
WEIGHT
(g)
CONSTRUCTION
BRIEF
DIMENSIONS
(3)
RANGE (
) TIGHTEST (%) INCHES mm
VHP202Z
10 to 66K
66K to 100K
1K to
(1)
500 to < 1K
50 to < 500
30 to < 50
20 to < 30
10 to < 20
5 to < 10
± 0.001
± 0.0025
± 0.005
± 0.01
± 0.02
± 0.05
± 0.1
300
0.3 W
0.2 W
1.4
Oil-filled, tinned
copper leads, nickel
shell, kovar and
glass header
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.
4.11 ± 0.51
10.54 ± 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
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.
Note: Foil shown in black, etched spaces in white
Mutual
Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Interloop
Capacitance
Reduction
in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Current Path
After Trimming
FIGURE 3 - TYPICAL RESISTANCE/
TEMPERATURE CURVE
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C)
ΔR
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
TCR Chord Slopes for Different Temperature Ranges
FIGURE 4 - 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)
