VPR220S, VPR221S
Vishay Foil Resistors
Bulk Metal
®
Foil Technology Precision Foil Power Surface
Mount Resistors in TO-220 Configuration with TCR of
± 2 ppm/°C, Tolerance of to ± 0.01 % and Power Rating to 8 W
www.vishay.com For any questions, contact: foil@vishay.com Document Number: 63050
2 Revision: 29-Feb-08
Notes
1. Whichever is lower
2. Heat sink chassis dimensions and requirements per MIL-R-39009/1B:
3. Inductance (L) due mainly to the leads
4. The resolution limit of existing test equipment (within the measurement capability of the equipment, or “essentially zero”)
5. µV/°C relates to EMF due to lead temperature difference
FIGURE 2 - TYPICAL TCR CURVE
- 50 - 25 0 + 20 + 50 + 75 + 100 + 125
- 55
+ 150
+ 100
+ 50
0
- 50
- 100
- 150
- 200
Δ
R
R
(ppm)
Ambient Temperature (°C)
± 2 ppm/°C (+ 25 °C Reference)
FIGURE 3 - TRIMMING TO VALUES
(Conceptual Illustration)
Mutual Inductance
Reduction due
to Opposing
Current in
Adjacent Lines
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
Interloop Capacitance
Reduction in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Current Path
After Trimming
TABLE 3 - SPECIFICATIONS
Load Life Stability at 2000 h ± 0.05 % max. ΔR under full rated power at + 25 °C
Power Rating at + 25 °C
8 W or 3 A
1)
on heat sink
2)
1.5 W or 3 A
1)
in free air
Further derating not necessary
Current Noise < 0.010 µV (rms)/V of applied voltage (- 40 dB)
High Frequency Operation
Rise time 1 ns without ringing
Inductance
3)
(L) 0.1 µH maximum: 0.03 µH typical
Capacitance (C) 1.0 pF maximum: 0.5 pF typical
Voltage Coefficient
4)
< 0.1 ppm/V
Operating Temperature Range - 55 °C to + 150 °C
Maximum Working Voltage 300 V. Not to exceed power rating
Thermal EMF
5)
0.15 µV/°C maximum (lead effect)
DIMENSION INCHES mm
L 6.00 152.4
W 4.00 101.6
H 2.00 50.8
T 0.04 1.0
