Document 1254-1
Dual Inductor for Class D
RA7231-AL
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•
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AEC-Q200 Grade 1 qualified
Dual inductors for use in Class D output filters
A single shielded package contains both coils.
Very low magnetic coupling
Designed for 40 Watts into 2 Ohm load
Less than 1% drop in inductance up to 12.3 A
Core material
Ferrite
Terminations
RoHS compliant tin-silver (96.5/3.5) over copper.
Weight
12.3 g
Ambient temperature
–40°C to +125°C with
Irms
current
Maximum part temperature
+165°C (Ambient + temperature rise)
Storage temperature
Component: –40°C to +165°C.
Tape and reel packaging: –40°C to +80°C
Resistance to soldering heat
Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)
1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Tape and reel packaging
150/13″ reel Plastic tape: 32 mm wide,
0.5 mm thick, 24 mm pocket spacing, 16.1 mm pocket depth
PCB washing
Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See
Doc787_PCB_Washing.pdf.
Part
number
1
RA7231-AL_
L1
L2
Inductance
2
±10% (µH)
5.0
5.0
DCR max
3
(mOhms)
6.0
6.0
SRF typ
4
(MHz)
34
34
Isat
(A)
5
10% drop 20% drop 30% drop
15.5
15.5
16.6
16.6
17.6
17.6
Irms
(A)
6
20°C rise 40°C rise
7.6
10.6
1. When ordering, please specify
packaging
code:
RA7231-ALD
Packaging: D
= 13″ machine-ready reel. EIA-481 embossed plastic tape.
B
= Less than full reel. In tape, but not machine ready.
To have a leader and trailer added ($25 charge), use code letter D instead.
2. Inductance measured at 100 kHz, 1.0 Vrms, 0 Adc using an Agilent/HP 4284A impedance analyzer. Minimum inductance is 4.5 µH at 11.5 Adc.
3. DCR is for each winding, measured on a micro-ohmmeter.
4. SRF measured using Agilent/HP 8753D network analyzer.
5. DC current (typical) at which the inductance drops the specified amount from its value without current.
6. Current applied to windings at the same time that causes the specified temperature rise from 25°C ambient.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 1254-1
Revised 04/05/16
© Coilcraft Inc. 2016
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 1254-2
Class D Dual Inductor – RA7231-AL
L vs Current
10
8
7
6
5
4
3
Dot indicates pin 1
1
4
RA7231-AL
XXXX Y
0.551
max
14,00
L1
2
L2
3
Inductance (µH)
0.610
max
15,50
2
0.630
max
16,00
0.004 /0,10
1
0.1
1.0
10
100
Current (A)
C
L
0.224
5,7
2
C
L
0.047
1,2
3
0.094
2,4 0.122
3,1
1
4
0.248
6,3
0.122
3,1
0.071
1,8
Recommended
Land Pattern
0.303
7,7
1
0.126
3,2
4
0.134
3,4 0.102
2,6
C
L
2
3
0.209
5,3
C
L
0.031
0,8
0.102
2,6
Dimensions are in
inches
mm
US
+1-847-639-6400 sales@coilcraft.com
UK
+44-1236-730595 sales@coilcraft-europe.com
Taiwan
+886-2-2264 3646 sales@coilcraft.com.tw
China
+86-21-6218 8074 sales@coilcraft.com.cn
Singapore
+ 65-6484 8412 sales@coilcraft.com.sg
Document 1254-2
Revised 04/05/16
© Coilcraft Inc. 2016
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
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