300144_07 Datasheet, PDF (2/5 Pages) Vishay Siliconix – High Precision Voltage Divider Resistors with TCR Tracking to 0.5 ppm/°C and Tolerance Match to 0.005 % (50 ppm)

300144, 300145
Vishay Foil Resistors
High Precision Voltage Divider Resistors
with TCR Tracking to 0.5 ppm/°C and
Tolerance Match to 0.005 % (50 ppm)
FIGURE 1 - TRIMMING TO VALUES (conceptual illustration)
Interloop Capacitance
Reduction in Series
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Current Path
After 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
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters)
Model 300144 and Schematic²⁾
0.295
(7.49)
0.1
(2.54)
Match
Tolerance
Model 300145 and Schematic²⁾
0.375
(9.53)
0.2
(5.08)
654
Date Code
Model No.
VISHAY
9825 0.320
300144 ^(8.13)
0.015 ± 0.005
(0.38 ± 0.13)
0.025 ± 0.005
(0.64 ± 0.13)
0.75¹⁾
(19.05)
1
R1 Indicator
(High or
Low Value)
R1
R2
1
2
3
123
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
Date Code
Model No.
0.015 ± 0.005
(0.38 ± 0.13)
0.025 ± 0.005
(0.64 ± 0.13)
VISHAY
0730
300145
0.375
(9.53)
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
300144, 300145
- 55 °C
200 %
175 %
+ 70 °C
Double Rated Power
150 %
125 %
100 %
Rated Power
75 %
50 %
25 %
Safe operation
for < 150 ppm
∆R after 2000
hours load-life.
0
- 75 - 50 - 25
0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Note: Power is proportional to the divider ratio
Example: In a 300144 (1K/10K dual), the power rating would be
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
FIGURE 4 - FOIL RESISTOR TCR COMPARISON
OF FOIL ALLOYS IN MILITARY RANGE
+ 150
+ 100
+ 50
∆R
R0
(ppm)
- 50
- 100
- 150
- 200
- 50 - 25
- 55
2 ppm/°C
0 + 25 + 50 + 75 + 100 + 125
Temperature (°C)
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For any questions, contact: [e-mail]
Document Number: 63045
Revision: 21-Nov-07