300144, 300145
Vishay Foil Resistors
TABLE 1A - MODELS 300144 AND 300145
SPECIFICATIONS
TABLE 1B -MODELS 300144 AND 300145
SPECIFICATIONS
ABSOLUTE TCR
(-55°Cto+125°C,
RESISTANCE
RATIO
TOLERANCE
MATCH
TCR TRACKING MAX.
RESISTANCE
VALUES
ABSOLUTE
+ 25 °C ref.)
1:1
0.5 ppm/°C
1.0 ppm/°C
1.5 ppm/°C
2.0 ppm/°C
TOLERANCE
0.005 %
0.01 %
TYPICAL AND MAX.
SPREAD
> 1:1 to 4:1
> 4:1 to 10:1
> 10:1
≥ 500 Ω to 20 kΩ
100 Ω to < 500 Ω
0.005 %
0.01 %
2 ppm/°C 3 ppm/°C
Note
• See table 3 for additional established ratios
FIGURE 1 - TRIMMING TO VALUES (conceptual illustration)
Interloop
Current Path
Before Trimming
Capacitance
Reduction
in Series
Current Path
After Trimming
Mutual
Inductance
Reduction due
to Opposing
Current in
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing Resistance
Adjacent Lines
Note: Foil shown in black, etched spaces in white
FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters)
Model 300144 and Schematic (2)
Model 300145 and Schematic (2)(3)
0.375
(9.53)
0.2
(5.08)
0.1
0.295
(7.49)
Match
(2.54)
6
5
4
Tolerance
VISHAY
9825
300144
6
5
4
Date Code
Model No.
0.320
(8.13)
R1
R2
1
0.015 0.005
(0.38 0.13)
Low
Resistance
Value
R4
R1
R3
R2
0.75(1)
0.025 0.005
(0.64 0.13)
VISHAY
0730
1
2
3
Indicator
0.375
(9.53)
(19.05)
Date Code
Model No.
300145
0.015 0.005
(0.38 0.13)
Match
Tolerance
1
2
3
0.75(1)
(19.05)
0.025 0.005
(0.64 0.13)
Dimensional Tolerance: 0.010ꢀ (0.25)
0.1 (2.54)
1
2
3
(1)
Lead wires: #22 AWG solder coated copper,
0.75ꢀ minimum length
(2)
(3)
Each divider pair consists of two resistors on one
single chip
1
2
3
For model 300145 the 2 chips are independent
and with no special relationship from chip to chip
0.1 (2.54)
www.foilresistors.com
2
For any questions, contact: foil@vishaypg.com
Document Number: 63045
Revision: 23-Mar-10