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SMR1DZ/SMR3DZ (Z-Foil)
Vishay Foil Resistors
Ultra High Precision Z-Foil Molded Surface Mount Resistor with
TCR down to ± 0.05 ppm/°C , PCR of ± 5 ppm at Rated Power,
Flexible Terminations, and Load Life Stability of ± 0.005 % (50 ppm)
FEATURES
? Temperature Coefficient of Resistance (TCR):
± 0.05 ppm/°C typical (0 °C to + 60 °C)
± 0.2 ppm°C typical (- 55 °C to + 125 °C,
Any value at any tolerance available within resistance range
INTRODUCTION
The SMRxDZ is an ultra high precision molded surface
mountable resistor offering all the elements of precision;
including low TCR, tight tolerance, long term stability, low
noise, low thermal EMF, and non-measurable voltage
coefficient. One of the important parameters influencing
stability is the Temperature Coefficient of Resistance (TCR).
Although the TCR of foil resistors is considered extremely
low, this characteristic has been further refined over the
years. The SMRxDZ utilizes ultra high precision Bulk Metal ?
Z-Foil.
The Z-Foil technology provides a significant reduction of
the resistive element’s sensitivity to ambient temperature
variations (TCR) and to self heating when power is applied
(power coefficient).
Voltage division with tight tracking < 2 ppm/°C can be
+ 25 °C Ref.)
? Tolerance: to ± 0.01 %
? Power Coefficient of Resistance (PCR)
“ ? R due to self heating”: 5 ppm at Rated Power
? Flexible Terminations ensure minimal stress transference
from the PCB due to a difference in Thermal Coefficient of
Expansions (TCE)
? Electrostatic Discharge (ESD) above 25 000 Volts
? Load Life Stability: ± 0.005 % (70 °C, 2000 hours at Rated
Power)
? Resistance Range: 5 ? to 80 k ? (for higher and lower
values, please contact us)
? Power Rating: to 600 mW at 70 °C
? Non Inductive, Non Capacitive Design
? Current Noise: - 40 dB
? Voltage Coefficient: < 0.1 ppm/V
? Non Inductive: < 0.08
? Non Hot Spot Design
? Terminal Finishes available: Lead (Pb)-free
Tin/Lead Alloy
? Matched sets with TCR tracking are available upon request
? For higher Performances please contact us
? Any Value available within Resistance Range (e.g. 1K234)
? Prototype Samples available from 48 hours. For more
Information, please contact foil@vishaypg.com
achieved with 2 randomly selected units even with a large
ratio between the two values.
Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
TABLE 1 - TOLERANCE AND TCR VERSUS
RESISTANCE VALUE
(- 55 °C to + 125 °C, + 25 °C Ref.)
APPLICATIONS
? Precision Amplifiers
? High Precision Instrumentation
? Medical
? Automatic Test Equipment (ATE)
? Industrial
? Audio (High End Stereo
Equipment)
? EB Application
? Military, Airborne and Space
? Pulse Application
? Measurement Instrumentation
V in
R 1
-
+
R 2
V o u t
SMRxDZ
VALUE
50 ? to 80 k ?
20 ? to < 50 ?
10 ? to < 20 ?
5 ? to < 10 ?
STANDARD
TOLERANCE 1)
± 0.01 %
± 0.02 %
± 0.05 %
± 0.1 %
TYPICAL TCR AND
MAX. SPREAD 1)
(ppm/°C)
± 0.2 ± 1.8
± 0.2 ± 2.8
± 0.2 ± 4.8
± 0.2 ± 6.8
FIGURE 1 - POWER DERATING CURVE
- 55 °C + 70 °C
200
175
150
125
100
75
Note
50
1. Tighter performances are available
25
0
- 75
- 25
+ 25 + 75 + 125
+ 175
Ambient Temperature (°C)
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63118
Revision: 25-Mar-10
For any questions, contact: foil@vishaypg.com
www.foilresistors.com
1
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