Type MS Power Film Resistors
Page 1 of 2
Power Film Resistor Family with Wide Resistance Range and +275C Maximum Temperature
With power ratings to 22 Watts and voltage ratings as
high as 6,000 volts in an axial-lead resistor with values to
30 Megohms, the Type MS Power Film Resistors deliver
the performance capabilities that can simplify circuit
design and reduce equipment cost and complexity.
Type MS Power Film Resistors provide all these features in
a single resistor:
Full power and voltage ratings, without derating:
- for non-inductive performance.
- for high resistance values that extend the critical
resistance value up to 10 times.
Higher voltage ratings without the limitations of minimum
wire size and spacing.
Excellent long-term stability.
Tests demonstrate typical stability of 0.05% per 1,000
Caddock's
hours over extended life.
Non-Inductive
Design
N
Micronox Resistance Films
Type MS performance begins with Caddock's Micronox
resistance films. Produced exclusively by Caddock
Electronics, these proven complex oxide films have been
The Serpentine Pattern used in this patented product
used reliably for over 30 years in Caddock's precision power
contain features which enhance high stability in
resistor products.
High-Power Resistor applications.
Micronox resistance films are fired directly onto a
Most models are manufactured with Caddock's
ceramic core at temperatures above 1400F (760C). These
Non-Inductive serpentine resistive pattern that provides for
resistance films have demonstrated outstanding stability
neighboring lines to carry current in opposite directions,
when exposed to a high ambient temperature, thermal shock
thereby achieving maximum cancellation of flux fields over
and high power densities.
the entire length of the resistor. This efficient non-inductive
This unique approach to precision power resistors opens
construction is accomplished without derating of any
new design possibilities by providing a wider resistance
performance advantages.
range, precise temperature characteristics, and higher
The result is a truly non-inductive resistor that is about as
temperature and power handling capability.
inductive as a straight piece of wire the length of the resistor
body. This efficient design means faster settling times and
minimum distortion in all types of high frequency circuits.
Carefully Controlled Manufacturing and Test Procedures Assure Compliance with
Strict Quality Control Requirements.
Manufacturing Control Reliability Verification
Type MS Resistors are produced under intensive Type MS resistors are included in the Caddock Reliability
manufacturing controls with processes which include power Testing Program. Conformance to specification parameters
conditioning, overvoltage conditioning, and maximum including Extended Life, Shock, Vibration, and Humidity are
temperature conditioning. verified on a periodic basis. Data from Type MS resistors
can be compared by similarity to other Caddock resistor
types, since Type ML, MM, MS, MP, MG, and MK represent
Quality Control
an identical combination of materials - aluminum oxide
From the certification and testing of all materials, to the
substrate, Micronox resistance film, and silicone insulating
supervision of manufacturing processes, all Caddock Type
coating.
MS Power Film Resistors are produced under procedures
that have been approved for conformance to the
requirements of Mil-I-45208 in many recent surveys as
described on page 8.
Certain products shown in this catalog are covered by one or more patents,
there are also patents pending.
Sales and Applications Engineering
17271 North Umpqua Hwy.
ELECTRONICS, INC.
Roseburg, Oregon 97470-9422
e-mail: caddock@caddock.com web: www.caddock.com
Phone: (541) 496-0700
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (541) 496-0408
2003-2017 Caddock Electronics, Inc. 28_IL108.0717 Type MS Power Film Resistors
Page 2 of 2
MS126, MS150
MS151, MS175
MS176, MS210
MS214
MS220
MS221
MS223
Construction:
The Type MS Power
MS244
Film Resistor is constructed
with Micronox resistance films
bonded to a high strength solid
MS245
ceramic core. Nickel alloy end caps
and axial leads complete the assembly.
Encapsulation is provided by a high
MS260
temperature silicone conformal coating.
Type MS: Lead material is Nickel Clad Copper
with thin Gold Plate, solderable.
MS281
For welding applications, optional pure nickel
leads are available on Models MS126, MS150,
MS151, MS175, MS176, MS210. Contact
MS310
Caddock Applications Engineering.
MS313, MS315
MS322
Resistance Dimensions in inches and (millimeters)
Watt- Watt-
Specifications:
Model Max. Dielect.
age at age at
No. Voltage Strength
Min. Max. A B C
+25C +125C
Resistance Tolerance: 1% (tolerances to 0.1% on
.188 .020 .070 .015 .020 .002
MS126 0.25 0.25 200 500 1 Meg special order).
20
(4.78 .51) (1.78 .38) (.51 .05)
.188 .020 .070 .015 .020 .002
Temperature Coefficient: 50 ppm/C. TC referenced
MS150 0.50 0.30 500 2 K
20
(4.78 .51) (1.78 .38) (.51 .05)
*
to +25C, R taken at -15C and +105C.
.250 .020 .094 .015 .025 .002
MS151 0.50 0.50 300 750 2 Meg
20
(6.35 .51) (2.39 .38) (.64 .05)
Insulation Resistance: 10,000 Megohms, min.
.250 .020 .094 .015 .025 .002
MS175 0.75 0.45 750 2 K
20
(6.35 .51) (2.39 .38) (.64 .05)
*
Overload/Overvoltage: 5 times rated power with applied
.313 .020 .094 .015 .025 .002
MS176 0.75 0.75 500 750 5 Meg
45
voltage not to exceed 1.5 times maximum continuous oper-
(7.95 .51) (2.39 .38) (.64 .05)
.313 .020 .094 .015 .025 .002
ating voltage for 5 seconds. R 0.5% max. or 0.5 ohm
MS210 1.0 0.60 750 3 K
45
(7.95 .51) (2.39 .38) (.64 .05)
*
max., whichever is greater.
.313 .030 .109 .025 .025 .002
MS214 1.0 0.60 500 750 5 Meg
45
(7.95 .76) (2.77 .64) (.64 .05)
Thermal Shock: Mil-Std-202, Method 107, Cond. C, R
.400 .060 .140 .030 .025 .002
MS220 2.0 1.2 1,000 800 20 10 Meg
(10.16 1.52) (3.56 .76) (.64 .05) 0.5% max. or 0.5 ohm max., whichever is greater.
.575 .050 .165 .030 .032 .002
MS221 3.0 1.8 1,000 800 45 10 Meg
Moisture Resistance: Mil-Std-202, Method 106, R 0.5%
(14.61 1.27) (4.19 .76) (.81 .05)
.480 .060 .230 .030 .040 .002 max. or 0.5 ohm max., whichever is greater.
MS223 3.0 1.8 800 1,000 4 Meg
20
(12.19 1.52) (5.84 .76) (1.02 .05)
Load Life: 1,000 hours at rated power at +25C or
.950 .060 .230 .030 .040 .002
MS244 4.0 2.4 2,000 1,000 15 Meg
45
(24.13 1.52) (5.84 .76) (1.02 .05)
+125C (see derating curve), not to exceed rated
.570 .060 .300 .030 .040 .002
MS245 4.0 2.4 800 1,000 6 Meg
20
voltage, R 0.5% max. or 0.5 ohm max., whichever is
(14.48 1.52) (7.62 .76) (1.02 .05)
.970 .060 .300 .030 .040 .002
greater. Mounting method per Mil-R-39007, para. 4.7.2
MS260 6.0 3.6 2,000 1,000 15 Meg
45
(24.64 1.52) (7.62 .76) (1.02 .05)conditionin.
.910 .060 .350 .040 .040 .002
MS281 8.0 4.8 2,000 1,000 8 Meg
45
(23.11 1.52) (8.89 1.02) (1.02 .05)
Maximum Operating Temperature: +275C.
1.250 .070 .350 .040 .040 .002
MS310 10.0 6.0 4,500 1,000 20 Meg
45
(31.75 1.78) (8.89 1.02) (1.02 .05)
Encapsulation: High Temperature Silicone Conformal.
2.000 .080 .350 .040 .040 .002
MS313 12.5 7.5 6,000 1,000 30 Meg
50
(50.80 2.03) (8.89 1.02) (1.02 .05)
B
2.000 .080 .350 .040 .040 .002 A
1.500 .125
C
MS315 15.0 9.0 1,000 50 1 Meg
(50.80 2.03) (8.89 1.02) (1.02 .05)
*
(38.10 3.18)
3.000 .090 .350 .040 .040 .002
MS322 22.0 13.2 1,000 1.5 Meg
100
(76.20 2.29) (8.89 1.02) (1.02 .05)
*
Limited by power rating.
DIMENSIONS IN INCHES AND (MILLIMETERS)
*
Models with low inductance construction are in shaded areas.
100
Derating Curve:
A - all MS models
Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas.
80
except MS126,
B
A
60
RATED POWER OR MS151, MS176
Ordering Information:
RATED VOLTAGE, % 40
MS220 -100K - 1%
B - MS126, MS151,
20
MS176
Model Number: Tolerance
0
25 75 125 175 225 275
Resistor Value: AMBIENT TEMPERATURE, C
Sales and Applications Engineering
17271 North Umpqua Hwy.
ELECTRONICS, INC.
Roseburg, Oregon 97470-9422
e-mail: caddock@caddock.com web: www.caddock.com Phone: (541) 496-0700
For Caddock Distributors listed by country see caddock.com/contact/dist.html Fax: (541) 496-0408
2003-2017 Caddock Electronics, Inc. 28_IL108.0717