MR106-250-.05% Huntington Electric Inc., MR106-250-.05% Datasheet - Page 5

RESISTOR 250 OHM 1/4W .05% WW

MR106-250-.05%

Manufacturer Part Number
MR106-250-.05%
Description
RESISTOR 250 OHM 1/4W .05% WW
Manufacturer
Huntington Electric Inc.
Series
MR100r
Datasheet

Specifications of MR106-250-.05%

Resistance (ohms)
250
Power (watts)
0.25W, 1/4W
Composition
Wirewound
Temperature Coefficient
±10ppm/°C
Tolerance
±0.05%
Size / Dimension
0.250" Dia x 0.500" L (6.35mm x 12.70mm)
Lead Style
Through Hole
Package / Case
Axial
Resistance In Ohms
250
Case
Axial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Height
-
Other names
MR106-250-.05
MR106-250-.05%
Resistor Tolerance
Mills Resistor uses calibration bridges which are
annually calibrated to NIST traceable standards
to verify the resistance during the manufacturing
process. A final resistance check is performed
immediately before shipping. Standard available
tolerances are 1%, 0.5%, 0.25%, 0.1%, 0.05%
and 0.01%. In some cases accuracies of .005%
and tighter are available; contact the factory.
Please see the chart below for minimum resis-
tance and minimum tolerance ratings.
Resistance Range
Maximum resistance values are shown in the
accompanying tables. Minimum values can be
manufactured down to 0.5 ohms (and below in
some cases). Values in the megohm range can
be considered common in all resistor sizes that
accommodate a maximum ohmic value greater
than 1 megohm. Please see the chart below for
minimum resistance and minimum tolerance
ratings.
Thermal EMF
This parasitic voltage is generated at the junc-
tion of dissimilar metals when the metals are at
different temperatures. Thermal EMF is created
in a resistor due to external temperature gradi-
ents and non-symmetrical power distribution
within the resistor. Mills Resistor’s construction
method virtually eliminates this effect.
Tolerance and TCR
Measurements are made on equipment calibrated to NIST standards. Limitations do exist in
measuring two-leaded resistors, so there are minimum practical tolerance limits depending upon
the resistance required. The following tables shows these.
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TCR Tracking
The use of proprietary manufacturing processes
allows Mills to offer TCR tracking of 2ppm/ºC.
The tracking of multiple resistors is dependent
upon value, style and temperature range. Please
check with our engineering department with your
specific requirements.
Stability
Stability is usually expressed as a change in
resistance per unit of time. Mills’ resistors have a
typical shelf life (no-load) stability of <30ppm/
year. Shelf life stabilities of <10ppm/year are
available (MR300 series). Typical load-life
stability (10,000 hours at 125ºC) is ±0.01%.
Temperature Coefficient of
Resistance (TCR)
TCR is defined as the unit change in resistance
per degree change in the temperature of the
resistor. This change in wirewound resistors is
non-linear and must be stipulated over a specific
temperature range. TCR is expressed in parts
per million per degree Centigrade (ppm/ºC) and
is provided by the following formula.
See the chart below for minimum resistance and
minimum tolerance ratings.
R
R
T
T
p
0
0
0
0
1
2
1
2
p
= Reference temperature in ºC
= Test temperature in ºC
= Resistance at temperature, T
= Resistance at the test temperature, T
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LECTRIC
Visit our website @ www.millsresistor.com
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Order Hotline: 916-422-5461
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Fax: 916-422-1409
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