Type MS Power Film Resistors
Page 1 of 2
Power Film Resistor Family with Wide Resistance Range and +275°C 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:
•
Higher voltage ratings without the limitations of minimum
•
Excellent long-term stability.
wire size and spacing.
Tests demonstrate typical stability of 0.05% per 1,000
hours over extended life.
- for non-inductive performance.
- for high resistance values that extend the critical
resistance value up to 10 times.
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
used reliably for over 30 years in Caddock's precision power
resistor products.
Micronox
®
resistance films are fired directly onto a
ceramic core at temperatures above 1400°F (760°C). These
resistance films have demonstrated outstanding stability
when exposed to a high ambient temperature, thermal shock
and high power densities.
This unique approach to precision power resistors opens
new design possibilities by providing a wider resistance
range, precise temperature characteristics, and higher
temperature and power handling capability.
N
Caddock's
Non-Inductive
Design
The Serpentine Pattern used in this patented product
contain features which enhance high stability in
High-Power Resistor applications.
Most models are manufactured with Caddock's
Non-Inductive serpentine resistive pattern that provides for
neighboring lines to carry current in opposite directions,
thereby achieving maximum cancellation of flux fields over
the entire length of the resistor. This efficient non-inductive
construction is accomplished without derating of any
performance advantages.
The result is a truly non-inductive resistor that is about as
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
Type MS Resistors are produced under intensive
manufacturing controls with processes which include power
conditioning, overvoltage conditioning, and maximum
temperature conditioning.
Reliability Verification
Type MS resistors are included in the Caddock Reliability
Testing Program. Conformance to specification parameters
including Extended Life, Shock, Vibration, and Humidity are
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
an identical combination of materials - aluminum oxide
substrate, Micronox
®
resistance film, and silicone insulating
coating.
Quality Control
From the certification and testing of all materials, to the
supervision of manufacturing processes, all Caddock Type
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.
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL108.1004
Type MS Power Film Resistors
Page 2 of 2
MS 126, MS150
MS 151, MS175
MS 176, MS210
MS 214
MS 220
MS 221
MS 223
MS 244
MS 245
MS 260
MS 281
MS 310
Construction:
The Type MS Power
Film Resistor is constructed
with Micronox
®
resistance films
bonded to a high strength solid
ceramic core. Nickel alloy end caps
and axial leads complete the assembly.
Encapsulation is provided by a high
temperature silicone conformal coating.
Type MS:
Lead material is Nickel Clad Copper
with thin Gold Plate, solderable.
For welding applications, optional pure nickel
leads are available on Models MS126, MS150,
MS151, MS175, MS176, MS210. Contact
Caddock Applications Engineering.
MS 313, MS315
MS 322
Model
No.
Watt-
Watt-
Max.
Dielect.
age at age at
Voltage
Strength
+25°C +125°C
Resistance
Min.
Dimensions in inches and (millimeters)
Max.
A
B
C
Specifications:
MS 126
MS 150
MS 151
MS 175
MS 176
0.25
0.50
0.50
0.75
0.75
0.25
0.30
0.50
0.45
0.75
0.60
0.60
1.2
1.8
1.8
2.4
2.4
3.6
4.8
6.0
7.5
9.0
200
500
500
750
750
750
20
Ω
20
Ω
20
Ω
20
Ω
45
Ω
1 Meg
2K
2 Meg
2K
5 Meg
*
*
*
300
500
MS 210
1.0
750
45
Ω
3K
MS 214
1.0
500
750
45
Ω
5 Meg
MS 220
2.0
1,000
800
20
Ω
10 Meg
MS 221
3.0
1,000
800
45
Ω
10 Meg
MS 223
3.0
800
1,000
20
Ω
4 Meg
MS 244
4.0
2,000
1,000
45
Ω
15 Meg
MS 245
4.0
800
1,000
20
Ω
6 Meg
MS 260
6.0
2,000
1,000
45
Ω
15 Meg
MS 281
8.0
2,000
1,000
45
Ω
8 Meg
MS 310
10.0
4,500
1,000
45
Ω
20 Meg
MS 313
12.5
6,000
1,000
50
Ω
30 Meg
MS 315
15.0
by power rating
*
Limited Models with low
.
inductance construction are in shaded areas.
MS 322
22.0
13.2
*
*
1,000
50
Ω
1 Meg
1,000
100
Ω
1.5 Meg
.188
±.020
(4.78
±.51)
.188
±.020
(4.78
±.51)
.250
±.020
(6.35
±.51)
.250
±.020
(6.35
±.51)
.313
±.020
(7.95
±.51)
.313
±.020
(7.95
±.51)
.313
±.030
(7.95
±.76)
.400
±.060
(10.16
±1.52)
.575
±.050
(14.61
±1.27)
.480
±.060
(12.19
±1.52)
.950
±.060
(24.13
±1.52)
.570
±.060
(14.48
±1.52)
.970
±.060
(24.64
±1.52)
.910
±.060
(23.11
±1.52)
1.250
±.070
(31.75
±1.78)
2.000
±.080
(50.80
±2.03)
2.000
±.080
(50.80
±2.03)
3.000
±.090
(76.20
±2.29)
.070
±.015
(1.78
±.38)
.070
±.015
(1.78
±.38)
.094
±.015
(2.39
±.38)
.094
±.015
(2.39
±.38)
.094
±.015
(2.39
±.38)
.094
±.015
(2.39
±.38)
.109
±.025
(2.77
±.64)
.140
±.030
(3.56
±.76)
.165
±.030
(4.19
±.76)
.230
±.030
(5.84
±.76)
.230
±.030
(5.84
±.76)
.300
±.030
(7.62
±.76)
.300
±.030
(7.62
±.76)
.350
±.040
(8.89
±1.02)
.350
±.040
(8.89
±1.02)
.350
±.040
(8.89
±1.02)
.350
±.040
(8.89
±1.02)
.350
±.040
(8.89
±1.02)
.020
(.51
.020
(.51
.025
(.64
.025
(.64
.025
(.64
.025
(.64
.025
(.64
.025
(.64
.032
(.81
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
.040
(1.02
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
±.002
±.05)
Resistance Tolerance:
±1% (tolerances to 0.1% on
special order).
Temperature Coefficient:
50 ppm/°C. TC referenced
to +25°C,
ΔR
taken at -15°C and +105°C.
Insulation Resistance:
10,000 Megohms, min.
Overload/Overvoltage:
5 times rated power with applied
voltage not to exceed 1.5 times maximum continuous oper-
ating voltage for 5 seconds.
ΔR
0.5% max. or 0.5 ohm
max., whichever is greater.
Thermal Shock:
Mil-Std-202, Method 107, Cond. C,
ΔR
0.5% max. or 0.5 ohm max., whichever is greater.
Moisture Resistance:
Mil-Std-202, Method 106,
ΔR
0.5%
max. or 0.5 ohm max., whichever is greater.
Load Life:
1,000 hours at rated power at +25°C or
+125°C (see derating curve), not to exceed rated voltage,
ΔR
0.5% max. or 0.5 ohm max., whichever is greater.
Maximum Operating Temperature:
+275°C.
Encapsulation:
High Temperature Silicone Conformal.
1.500
±
.125
(38.10
±
3.18)
A
B
C
DIMENSIONS IN INCHES AND (MILLIMETERS)
Models with Caddock's Non-Inductive Resistance Pattern are in non-shaded areas.
Derating Curve:
RATED POWER OR
RATED VOLTAGE, %
100
80
60
40
20
0
25
75
Ordering Information
:
Model Number:
MS220 -100K - 1%
A
B
A - all MS models
except MS 126,
MS 151, MS 176
B - MS 126, MS151,
MS 176
Tolerance
Resistor Value:
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
AMBIENT TEMPERATURE,
°C
125
175
225
275
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL108.1004
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