SMT POWER INDUCTORS
Power Beads - PA0135 Series
Notes from Tables
1. The rated current as listed is either the saturation current or the
heating current depending on which value is lower.
2. The saturation current is the current which causes the
inductance to drop by 10% at the stated ambient temperatures
(-40°C, 25°C, 125°C). This current is determined by placing the
component in the specified ambient environment and applying
a short duration pulse current (to eliminate self-heating effects)
to the component.
3. The heating current is the DC current which causes the temper-
ature of the part to increase by approximately 40°C. This cur-
rent is determined by mounting the component on a PCB with
.25" wide, 2 oz. equivalent copper traces, and applying the cur-
rent to the device for 30 minutes. In the series hookup mode,
the resistance of the interconnection needs to be taken into
account when calculating temperature rise.
4. In high volt*time applications additional heating in the
component can occur due to core losses in the inductor
which may neccessitate derating the current in order to limit
the temperature rise of the component. In order to determine
the approximate total losses (or temperature rise) for a given
application, both copper losses and core losses should be
taken into account.
5. Optional Tape & Reel packaging can be ordered by adding a
“T” suffix to the part number, (i.e. PA0135.102T).
6. To order RoHS compliant part, add the suffix “NL” to the part
number (i.e. PA0135.102 becomes PA0135.102NL and
PA0135.102T becomes PA0135.102NLT).
Estimated Temperature Rise:
.833
Trise
= Coreloss (mW) + DCRloss (mW)
(°C)
K0
Coreloss
= K1 *
(
Fsw(kHz)
)
1.6688
* (K2 * dI)
2.17
(mW)
DCRloss
= Irms
2
* DCR(m
Ω
) (mW)
½
Irms
=
IDC
2
+ dI
2
(Arms)
12
Fsw(kHz)
= switching frequency (kHz)
dI
= delta I across the component (A)
The temperature of the component (ambient temperature +
temperature rise) should be within the listed operating
temperature range.
Inductance vs Current Characteristics
120
Percentage of
Initial Inductance
100
80
60
40
20
0
P1
P2
P3
0
0.2
0.4
0.6
0.8
1.0
Normalized I
DC
1.2
1.4
1.6
1.8
P1
-
Initial Inductance,
L
O
(.1V
RMS
, 300kHz,
0A
DC
, 25°C)
P2
-
Inductance (typically 95%
L
O
) at Rated I
DC
.
P3
-
Inductance (typically 90%
L
O
) at I
PK
.
Normalized Inductance
For More Information:
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KA Centre
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Wah Lai Industrial Centre
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Fotan, Shatin, Hong Kong
TEL: 852 2788 6588
FAX: 852 2776 1055
DISTRIBUTOR
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
©2005, Pulse Engineering, Inc. All Rights Reserved.
P525.B (5/05)
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