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:
- 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
hours over extended life.
Caddock's
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
used reliably for over 30 years in Caddock's precision power
resistor products.
The Serpentine Pattern used in this patented product
contain features which enhance high stability in
High-Power Resistor applications.
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.
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.
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.
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
Reliability Verification
Type MS Resistors are produced under intensive
manufacturing controls with processes which include power
conditioning, overvoltage conditioning, and maximum
temperature conditioning.
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
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (951) 369-1151
© 2004 Caddock Electronics, Inc.
28_IL108.1004
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