300144Z Datasheet, PDF (2/5 Pages) Vishay Siliconix – Ultra High Precision Z-Foil Voltage Divider Resistors with TCR

300144Z, 300145Z (Z-Foil)
Vishay Foil Resistors^{Ultra High Precision Z-Foil Voltage Divider Resistors with TCR}
Tracking to 0.1 ppm/°C, Power Coefficient Tracking of 5 ppm
at Rated Power, and Tolerance Match to 0.005 % (50 ppm)
FIGURE 1 - TRIMMING TO VALUES (conceptual illustration)
Interloop Capacitance
Current Path
Reduction in Series
Mutual Inductance
Reduction due
to Change in
T ^{Current Direction}
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
C _{Note: Foil shown in black, etched spaces in white}
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters)
U _{Model 300144Z and Schematic2)}
0.295
D _(7.49)
0.1
(2.54)
Match
Tolerance
Model 300145Z and Schematic²⁾
0.375
(9.53)
0.2
(5.08)
654
VISHAY
Date Code 9825 0.320
Model No. 300144Z ^(8.13)
O _{0.015 ± 0.005}
(0.38 ± 0.13)
0.025 ± 0.005
(0.64 ± 0.13)
0.75¹⁾
(19.05)
1
Low
Resistance
Value Indicator
R1
R2
1
2
3
R _{1 2 3}
D ^{P 0.1 (2.54)}
Tolerance: ± 0.010" (0.25)
1. Lead wires: #22 AWG solder coated copper,
0.75" minimum length
2. Each resistor contains 1 chip of two resistive
elements
VISHAY
Date Code 9825
Model No. 300145Z
0.375
(9.53)
0.015 ± 0.005
(0.38 ± 0.13)
0.025 ± 0.005
(0.64 ± 0.13)
0.75¹⁾
(19.05)
123
0.1 (2.54)
Match
Tolerance
6
5
4
R2
R1
R1
R2
1
2
3
FIGURE 3 - POWER DERATING CURVE
E _{300144Z, 300145Z}
- 55 °C
200 %
V _{175 %}
+ 70 °C
Double Rated Power
150 %
O ^{125 %}
100 %
Rated Power
75 %
R _{50 %}
25 %
Safe operation
for < 150 ppm
∆R after 2000
hours load-life.
P ₀
- 75 - 50 - 25
0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
IM ^{Note: Power is proportional to the divider ratio}
Example: In a 300144Z (1K/10K dual), the power rating would be
FIGURE 4 - TYPICAL TCR CURVE Z-FOIL
(for more details see table 1)
+ 500
+ 400
+ 300
+ 200
ΔR ^{+ 100}
R
0
(ppm)- ₁₀₀
- 200
- 300
- 400
- 500
0.05 ppm/°C
- 0.1 ppm/°C
- 0.16 ppm/°C
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
- 55 - 25
0 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C)
18 mW on the 1K and 182 mW on the 10K, for a total of 200 mW on
R1 + R2.
( ) ^R1
P1 = _{R1 + R2} ^P
( ) ^R2
P2 = _{R1 + R2} P
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Document Number: 63115
Revision: 21-Nov-07