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© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft appr
oval.
Specification subject to change without notice.
Please check web site for latest infor
mation.
PoE Transformers
Document 544
Document 544 Revised 12/14/11
For ST Microelectronics
STE12PS PSE Power Controller
1. When ordering, please specify a packaging code:
DA2420-ALD
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (175 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.
These surface mount flyback transformers were devel-
oped specifically for the ST Microelectronics STE12PS
12-Channel PSE Power Control Device.
They are designed to work with a 3.3 V input to provide a
12 V output. Isolation is 500 Vdc from each primary wind-
ing to the secondary winding.
Coilcraft can also design custom transformers with volt-
age, inductance and DCR values to meet your specific
requirements.
For free evaluation samples, contact Coilcraft or order
them on-line at www.coilcraft.com.
2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc.
3. Ipk is the peak current drawn at minimum input voltage.
4. Leakage inductance measured on the primary windings with all second-
ary pins shorted.
5. Turns ratio is with the primary windings connected in parallel.
6. Operating temperature range
–
40°C to +125°C.
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Weight 14.1 – 14.6 g
Terminations Tin-silver over tin over nickel over phos bronze
Tape and reel 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick,
32 mm pocket spacing, 11.p mm pocket depth
Part L at 0 A2 L at Ipk3
DCR max (Ohms) Leakage L Turns ratio5 Ipk3
number1 ±10% (µH) min (µH) 1-5 2-6 12-7 max (µH)4 pri : sec (A) Output
DA2420-AL_ 330 297 0.756 0.886 5.920 6.00 1 : 2 2.0 12 V, 100 mA
DA2421-AL_ 330 297 0.803 0.984 14.145 4.83 1 : 3 2.0 12 V, 100 mA
12
7
Sec
1
2
5
6
Pri
0.130
3,30
0.050
1,27
1
0.450
11,43
0.080
2,03
1.181
30,00
0.827
21,00
0.810
20,57
0.969
24,60
0.930
23,62
0.028
0,711
0.118
3,0
0.118
3,00
max
Dot indicates pin 1
max
max
112
67
Recommended
Land Pattern
0.004 /0,10
DA242 -ALx
XXXX YPrimary windings to be
connected in parallel on
the PC board.
