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© Coilcraft Inc. 2013

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.

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

DCR max (Ohms)

Leakage L

±10% (µH)

min (µH)

1-5

2-6

12-7

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

1

12

6

7

Recommended

Land Pattern

0.004 /0,10

DA242 -AL

x

XXXX Y

Primary windings to be

connected in parallel on

the PC board.