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STEWARD TOROIDS
Table Of Contents
Steward & Quality Assurance ....................................................................................................... 3
Quality Philosophy....................................................................................................................................................... 3
Quality Testing............................................................................................................................................................. 3
Quality Measurement System ..................................................................................................................................... 3
Part Identiication ........................................................................................................................... 4
Part Numbers .............................................................................................................................................................. 4
Standard Components ................................................................................................................... 5
Toroidal Core Coatings................................................................................................................................................ 5
Steward Ferrite Core Materials...................................................................................................... 6
Common Mode Materials ............................................................................................................................................ 6
Comparing Common Mode Materials ................................................................................................................... 6
Low Frequency Material 35................................................................................................................................... 8
Mid Frequency Material 28 ................................................................................................................................... 9
High Frequency Material 25................................................................................................................................ 10
Broad Frequency Material 38.............................................................................................................................. 11
DC Bias Materials Materials ...................................................................................................................................... 12
Comparing DC Mode Materials........................................................................................................................... 12
DC Bias Standard Temperature (0 to 70 C) Material 36 .................................................................................... 14
DC Bias Extended Temperature (-40 to 85 C) Material 46 ............................................................................... 15
Low DC Bias - High Permeability Material 56 ..................................................................................................... 16
Material 36/46 Minimum Inductance with Various Turns (8 mA DC Bias) .......................................................... 17
High Permeability Materials for Telecom .................................................................................................................. 18
Comparing Telecom Materials ............................................................................................................................ 18
Telecom Broad Temperature Material 42 .......................................................................................................... 20
Telecom High Permeability Material 40 ............................................................................................................. 21
Other Materials ......................................................................................................................................................... 22
Comparing Other Materials................................................................................................................................. 22
Material 35 ......................................................................................................................................................... 23
Material 39 ......................................................................................................................................................... 24
Material Comparison Chart ......................................................................................................... 5
Steward Catalog Toroid Parts ..................................................................................................... 6
Steward Medium & Large Catalog Toroid Parts ....................................................................... 30
Balun Core Catalog Parts ........................................................................................................... 31
Ferrite Property Measurement .................................................................................................... 3
Initial Permeability, Losses & Inductance Factor ....................................................................................................... 32
Changes in Inductance versus Temperature & Curie Temperature ........................................................................... 32
Flux Density, Residual Flux Density, Coercive Force & Amplitude Permeability ..................................................... 33
Pulse Characteristics................................................................................................................................................. 34
Power Loss................................................................................................................................................................ 34
Measurement of Impedance Of Ferrite Components ................................................................................................ 35
Terminology .................................................................................................................................. 36
Toroid Catalog
11th Ed. Rev D
02/2006
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 216 1202 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Paciic
- Singapore • Phone: +65 6272 2646 • Fax : +65 6272 6165 • e-mail: asia@steward.com
China
• Phone: +86-757-2563 8860 • Fax : +86-757-2563 8862 • e-mail: china@steward.com
Steward & Quality Assurance
Quality Philosophy
At Steward, customer focus is paramount in
our quality program. Our quality philosophy is
outlined as follows:
• Steward is a company committed to
continuous improvement. We fulill this
commitment by continually improving the
quality of the products and services we
provide our customers, both external and
internal.
• We recognize that our customers deine
quality. We further recognize that
continuous improvement can only result
from the fullest development of our
people and technologies.
• We believe that to pursue this course,
we must set unselish service as
our standard for conduct. Building
on the values of our history, we will
raise our standards of performance
through continuous improvement and
imagination. In addition, our actions
must demonstrate integrity, honesty,
excellence and self-discipline.
• We believe in teamwork. Our
commitment to continuous improvement
is fulilled and maintained by the
combined, cohesive efforts of people
with a common goal.
Quality Measurement System
Steward’s Quality Management Systems have
been certiied to the ISO 9001:2000 requirements
by Ceramic Industry Certiication Scheme Ltd.
Quality Testing
We test on the following equipment:
Inductance, Loss Factor: Hewlett-Packard 4274A Multi-Frequency LCR Meter
Hewlett-Packard 4275A Multi-Frequency LCR Meter
Impedance: Hewlett-Packard 4396B Network/Spectrum Analyzer
Hewlett-Packard 4991A Network/Spectrum Analyzer
Catalog is provided for informational purposes only. No guarantee is stated or im-
plied. Part speciications are located on the part prints. Steward is not responsible
for printing or typographical errors.
Please visit
www.Steward.com
for the most up-to-date information.
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 216 1202 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Paciic
- Singapore • Phone: +65 6272 2646 • Fax : +65 6272 6165 • e-mail: asia@steward.com
China
• Phone: +86-757-2563 8860 • Fax : +86-757-2563 8862 • e-mail: china@steward.com
3
Toroid Catalog
11tth Ed. Rev D
02/2006
Hewlett-Packard 4284A Multi-Frequency LCR Meter
Part Identiication
Part Numbers
Steward’s part numbers use a ten character
alphanumeric nomenclature providing:
• The material designation
• The product type (shape)
• A basic size description
• A parts modiier series
Product Types
35
T
______ - __ __ __
Steward’s Transformer and Filter Core Division
uses two basic shape designators:
T for toroidal cores
Example: 35T0100-00P
N for balun cores
Example: 35N0136-00P
PART NUMBERING SYSTEM
Basic Size Description
35 T
0100
- __ __ __
The four digits following the product description
provide the largest dimension of the part in
thousandths of an inch. For toroids and similar
shapes, it usually describes the outside or major
diameter of the core. For other types of parts,
it is the largest dimension speciied in the part’s
description.
35
T
0100
-
0
0
P
MATERIAL
TYPE
PRODUCT
CODE
PART
SIZE CODE
PART
THICKNESS
CATALOG
SPECIFICATION
PARYLENE
COATING
Material Designator
35
__ ______ - __ __ __
A two digit material designator is assigned to
materials on the basis of initial permeability.
Parts Modiier Series
35 T 0100 -
00P
The irst of the three digits following the
dash refers to the part thickness. A
zero through nine digit refers variations
in thickness from the same tool. The
second modifying digit relates to a custom
requirement (electrical testing or physical
speciication). The third digit or letter
describes a coating or inish.
Typical
Application
Material
Initial
Permeability
35
5000
Common Mode
Filtering
28
850
25
125
Coating Designations
P
— Parylene
Hi-Pot Rating 1000 VAC minimum
Nominal Thickness: 0.0005" / 0.0127 mm
H
— Epoxy
38
1700
46
4000
DC Bias
Ethernet
Transformers
36
4500
56
5500
High Perm
for Telecom
42
7500
40*
10000
Other
Applications
35
5000
39
7000
* 40 material large toroids are mostly used for very low
frequency power supply iltering
Please consult Steward’s Website
for other products.
4
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 216 1202 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Paciic
- Singapore • Phone: +65 6272 2646 • Fax : +65 6272 6165 • e-mail: asia@steward.com
China
• Phone: +86-757-2563 8860 • Fax : +86-757-2563 8862 • e-mail: china@steward.com
Toroid Catalog
11th Ed. Rev D
02/2006
Standard Components
Soft Ferrite
Typical Physical Constants
Toroidal Core Coatings
If required by customer applications, smooth,
resistive coatings may be provided. Standard dimen-
sions for each toroid are listed in the parts chart,
and coating will alter these. Inductance values are
as shown for standard sizes and cores are checked
after coating to ensure compliance.
Speciic Heat
0.25 cal/g/°C
Thermal Conductivity
10
-2
cal/sec/cm/°C
Coeficient of Linear Expansion 8-10 x 10
-6
/°C
Tensile Strength
500 kg/cm
2
Parylene
Parylene is ideally suited for core sizes with out-
side diameters less than 9.5 mm (0.375”). Parylene
is a highly conformal coating with uniform thickness
even around corners and edges. It is applied by
vapor deposition, which prevents clogging of small
openings. The addition of Parylene results in very
little increase in core size. It has a high resistivity
and a low coeficient of friction (close to that of Tef-
lon), which results in low wire insulation abrasion
during winding. Parylene’s relatively low dielectric
constant is 2.95, resulting in only a small increase
of winding-to-core capacitance. After coating, cores
are Hi-Pot tested to 1000 VAC volts for single thick-
ness. Higher voltages available upon request via
additional coating thicknesses.
Epoxy
Epoxy coating is the choice for cores about 9.5mm
(0.375") diameter or larger. It is applied by spraying.
Because of its thickness, epoxy coating provides some
cushioning during winding. Epoxy coating provides
inherent toughness, corrosion resistance, and very
good adhesion. These properties are retained even
after long term heat aging. After coating, cores are
Hi-Pot tested to 1000 VAC.
Compressive Strength
4200 kg/cm
2
Youngs Modulus
1260 kg/cm
2
Hardness (Knoop)
650
Density
4.6 to 4.9 g/cm
3
Mechanical Tolerances
OD — ID Tolerances
mm (inches)
OD — ID Uncoated Tol.
.508 (.020)
<
5.05 (.199)
5.08 (.200) - 9.50 (.374)
9.53 (.375) - 15.85 (.624)
15.88 (.625) - 25.37 (.999)
> 25.40 (1.000)
.127 (.005)
.152 (.006)
.254 (.010)
.381 (.015)
.508 (.020)
HT Tolerances
HT Uncoated Tol.
< 6.32 (.249)
6.35 (.250) - 7.34 (.289)
> 7.37 (.290)
.127 (.005)
.178 (.007)
.254 (.010)
Please visit
www.Steward.com
for the most up-to-date information.
Steward
www.steward.com
North America
- U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
North America
- Mexico • Phone: +52 662 260-4832 • Fax: +52 662 216 1202 • e-mail: mexico@steward.com
Europe
- Scotland, UK • Phone: +44 (0)1506 414200 • Fax +44 (0)1506 410694 • e-mail: europe@steward.com
Asia / Paciic
- Singapore • Phone: +65 6272 2646 • Fax : +65 6272 6165 • e-mail: asia@steward.com
China
• Phone: +86-757-2563 8860 • Fax : +86-757-2563 8862 • e-mail: china@steward.com
5
Toroid Catalog
11tth Ed. Rev D
02/2006
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