Inductor Selection Guide

Hurricane Electronics Lab utilizes three different core materials in its standard line of toroidal inductors. These inductors are catagorized into the "E", "A", and "K" series.

The following guidelines will provide a quick and easy way to select the proper inductor for a given design. The information contained in this supplement is provided for inductor selection with the assumption that a given induction and RMS current are already known values.

Suggested Inductor Series Based on Type of Topology
Inductor Series
"E" "A" "K"
Noise Filter (D.C.) X
Low Voltage Buck Mode
(V-in less than 25v)
X
Medium Voltage Buck Mode
(V-in 25v to 50v)
X X
High Voltage Buck Mode
(V-in 60v and up)
X X
Boost Mode X X
Flyback X



















Core material is a cost versus performance (core loss, or efficiency) tradeoff, with an "E" series inductor being the least expensive and the "K" series the most expensive. Inductors in the "A" series fall in between but are closer to the "E" Series inductors than "K" series inductors.

If performance rather than cost is the primary concern in a design, then "K" series inductors can be chosen for most applications. However, for low voltage buck mode converters the performance difference between the three series is very small, and the best choice is therefore an "E" series inductor, except for applications where even minute gains in efficiency are important. The "E" series inductors are also ideal for noise filters where they conduct almost pure DC with virtually no core loss except at the frequency of the noise that is being filtered out.

The "K" Series parts are recommended for use in flyback and boost mode converter circuits, where the higher volt second products contribute to higher core losses.

Our Part Numbers Explained

The diagram below explains our part numbering convention.

Series Core Material
Core Material Letter Description
E "E" SERIES
A "A" SERIES
K "K" Series

Several different leadouts and base mounting options are available for these inductors. Contact Hurricane Electronics Lab with your particular mounting needs.
Series Core Size
Core Size Letter Max Size OD Max Size HT
D* 0.48 0.24
E* 0.58 0.32
G 0.68 0.42
I 0.90 0.50
K 1.10 0.67
M 1.37 0.92
P** 1.69 1.21

*D & E core sizes are not available in K Material.
**P core size is only available in E Material.

"E" Inductors are most suited for Buck Mode regulators and EMI filters. For other applications and where greater efficiency is desired use the "H" line of Inductors. Simply replace the "E" in the part number with "H".

E Series Leadout Options

"A" Inductors are especially designed for high efficiency, high frequency operation in switch mode power supplies and have the additional advantage of being a cost-effective design alternative to inductors utilizing molypermalloy powder (MPP), or high flux cores. These parts will operate efficiently at frequencies up to 100 Khz.

"A" Inductors are wound on distributed air gap cores made form ferrous allow powder. The "A" Inductor line is the recommended inductor type for Linear Technology's "SwitcherCAD", National Semiconductor's "Simple Switcher", and other like types of power conversion controllers.

A Series Leadout Options

"K" Inductors are especially designed for high efficiency, high frequency operation in switch mode power supplies and have the additional advantage of being moderate in price. These parts will operate efficiently at frequencies above 100 Khz.

"K" Inductors are wound on distributed air gap cores made from ferrous alloy powder. These cores have a saturation level of 10,000 gauss, which provides a high flux density in a compact part.

The "K" Series parts are recommended for use in flyback and boost mode converter circuits, where the higher volt second product contribute to higher core losses.

K Series Leadout Options

Need help deciding? Contact our engineering department for assistance. Our engineers are able and willing to help with all of your design needs.
Call: 435.635.2003
email: eng@hurricaneelectronics.com


Leadout Options


Leadout and Base Mounting Options
for "E", "A", and "K" series


Vertical Mount
Leadout Suffix Leadout
AA 2" leads tinned 3/8" (nom.)
AB .50" leads tinned to base (min.)
AC .25" leads tinned to base (min.)


Horizontal Mount
Leadout Suffix Leadout
BB .50" leads tinned to base (min.)
BC .25" leads tinned to base (min.)
Note the series # in the right column for each base mount option


Horizontal Base Mount
Dimensions
Leadout Suffix A Nom B Nom C Nom D Max E Nom F Max Series #
HA .20" .10" .34" .68" .20" .52" KG
HA .20" .10" .56" .60" .20" .50" AD, AE


Horizontal Base Mount
Dimensions
Leadout Suffix A Nom B Nom C Nom D Max E Nom F Max Series #
HB .42" .38" .57" .57" .20" .20" EG, EI
HB .42" .37" 1.2" .68" .20" .63" AG
HB .42" .37" 1.15" .59" .19" .20" KG
HC .78" .40" .94" .72" .19" .25" EI, EK
HC .73" .50" 1.42" 1.10" .19" .92" AI, AK
HC .78" .40" 1.42" .72" .19" .25" KI, KK
HD 1.00" .62" 1.13" .975" .19" .30" EM, EP
HD 1.00" .62" 1.74" 1.37" .19" 1.22" AK, AM
HD 1.00" .62" 1.73" .98" .19" .30" KK, KM
Note the series # in the right column for each base mount option


Vertical Base Mount With Self Leads
Dimensions
Leadout Suffix A Nom B Nom C Nom D Max E Nom F Max Series #
VS .60" .23" .75" .42" .15" .83" KI
VB .80" .40" 1.0" .60" .50" .46" EI
VB .80" .40" 1.0" .60" .50" 1.20" AI, AK
VB .80" .40" 1.0" .60" .50" 1.05" KI, KK
VQ .90" .60" 1.10" .80" .50" 1.47" AK, AM
VQ .90" .80" 1.10" .80" .50" 1.40" KK, KM
VE 1.20" .70" 1.40" .92" .50" .60" EM
VE 1.20" .70" 1.40" .91" .50" 1.47" AM
VE 1.20" .70" 1.40" .91" .50" 1.40" KM
VH 1.50" .90" 1.70" 1.12" .50" .74" EP
VH 1.50" .90" 1.70" 1.15" .50" 1.47" AM
VH 1.50" .90" 1.70" 1.15" .50" 1.40" KM


Vertical Base Mount With Pin Leads
Dimensions
Leadout Suffix A Nom B Nom C Nom D Max E Nom F Max Series #
VA .60" .25" .75" .68" .15" .84" AG
VA .60" .23" .75" .67" .15" .83" KI
VC .80" .40" 1.30" .60" .28" .46 EK
VC, VJ .80" .40" 1.20" .60" .20" 1.20" AI, AK
VC, VJ .80" .40" 1.2" .60" .20" 1.05" KI, KK
VR, VM .90" .60" 1.30" .80" .20" 1.47" AK, AM
VR, VM .90" .60" 1.26" .80" .20" 1.40" KK, KM
VF 1.20" .70" 1.70" .92" .28" .60" EM
VF, VK 1.20" .70" 1.60" .90" .20" 1.47" AM
VF, VK 1.20" .70" 1.57" .91" .20" 1.40" KM
VI 1.50" .90" 1.94" 1.12" .28" .74" EP
VI, VL 1.50" .90" 1.90" 1.15" .20" 1.47" AM
VI, VL 1.50" .90" 1.90" 1.15" .20" 1.40" KM
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