A9845-AL

Document 345
SMT Planar Transformer – A9845-AL
Coilcraft’s surface mount planar transformers are ideal for
applications that require high efficiency in a low-profile
package. They are designed to perform in push-pull topologies operating at 200 – 300 kHz. The auxiliary winding can
be used to control input current to PWMs.
Planar transformers offer high power densities along with
great reliability and repeatability.
The A9845-A has a smaller footprint and lower profile than
our other planar transformers. The circular windings provide
very low DCR and excellent leakage inductance values.
To complete your design, Coilcraft offers a wide variety
of power inductors for use as input and output chokes. To
request free evaluation samples, contact Coilcraft or visit
www.coilcraft.com.
Part
number1
Output
power (W)
Input
voltage
range (V)
Output
voltage (V)
Output
current
(A rms)
A9845-AL_
10
36 – 75
3.3
2.0
Primary
Leakage
inductance1 inductance
min (mH)
max (µH)
1.50
1.4
0.80
A8945-ALD
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (250 parts per full reel).
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.
0.924
23,47
0.180
4,57
8
1
12T
8
7
5
0.070
쏗
1,78
6
6
Primary 3
7
5
1200
2
1
0.860 max
21,84
0.120
12T
0.814
20,68
0.080
2,03
0.0105
1. Inductance measured between pins 2 and 4 at 250 kHz, 0.1 Vrms,
0 Adc.
2. Storage and ambient operating temperature range: –40°C to +85°C.
3. Electrical specifications at 25°C.
1. When ordering, please specify packaging code:
1.100 max
27,94
Pri/sec
isolation
(Vrms)
DCR max (Ohms)
pri
sec
aux
6
0.224
5,69
0.224
5,69
0.110
쏗
2,79
4
2T
7
Secondary
2T
1
8
Auxiliary 6T
5
Recommended
Land Pattern
0.325 max
8,26
0.006 /0,15
0.060
1,52
0.100
2,54
Weight:
10.6 g
Terminations:
Matte tin over nickel over brass
Tape and reel: 250/13″ reel 56 mm tape width
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice.
Please check our website for latest information.
© Coilcraft, Inc. 2007
Document 345
Revised 06/19/07
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