MODEL HM74 SERIES
High Frequency
High Current
Low Profile
Surface Mount Inductors
FEATURES AND BENEFITS
NEW PRODUCT
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Closed magnetic circuit for high density board assembly
High performance, low loss ferrite core up to 5 MHz
Low profile designed for machine placement
Low DCR and high current up to 27 amps continuous
Class F design is compatible with vapor phase and infrared reflow soldering
Custom designs available
APPLICATIONS
• Laptop and notebook computers
• DC/DC converters in distributed power systems or VRM applications
• Inductor for general purpose use
ELECTRICAL / ENVIRONMENTAL
Operating Temperature Range
Storage Temperature Range
Ambient Temperature, Maximum
Insulation System
Specifications subject to change without notice.
-25°C to +135°C
-40°C to +85°C
80°C
Class F, 155°C
6
6-121
Model HM74 Series
SPECIFICATIONS
Part
Number
HM74-R47
HM74-R85
HM74-1R4
HM74-2R1
HM74-3R0
HM74-4R0
HM74-5R1
HM74-6R3
Inductance
(1)
Nominal
µH
±20%
0.47
0.85
1.40
2.10
3.00
4.00
5.10
6.30
Rated
(2)
DC Current
Amps
26.0
19.0
14.5
12.5
8.0
7.5
7.0
6.5
DC
Resistance
mΩ
Max.
1.1
2.1
3.6
4.4
11.9
13.7
15.5
17.2
DC
(3)
Resistance
mΩ
Typ.
0.9
1.8
3.0
3.7
9.9
11.4
12.9
14.3
Notes: (1) Inductance measured at 100kHz, 0.25V without DC current.
(2) Rated DC current is the approximate current at which inductance will be decreased by 20% from
its initial (zero DC) value or the DC current at which
∆T
= 50°C, whichever is lower.
(3) DC resistance measured at 20°C.
ORDERING INFORMATION
HM74
Model Series
1RO
TR
Packaging Option:
TB = Tubes (32 Units /Tube)
TR = Tape & 13" Reel (250 Units /Reel)
Inductance Code:
First two digits are significant.
Last digit denotes number of
trailing zeros. Values below
10µH "R" denotes decimal point.
6-122
Model HM74 Series
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