Document 423

PoE Transformer

For National Semiconductor
LM5070 PoE Interface• Developed for the NSC LM5070 PD Interface in 13 W applications.
• Operates at frequencies up to 1 MHz• Input: 36 – 72 V; Output: 3.3 V, 4.5 A, with secondary windings
connected in parallel• Isolation:1500 Vrms from the primary and auxiliary windings
to the secondary.
Core material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 12.4 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°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)
Packaging 175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick,
32 mm pocket spacing, 11.9 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additionalaqueous wash. See Doc787_PCB_Washing.pdf.

Partnumber1C1023-AL_4
L at 0 A2
L at Ipk3	    DCR max (Ohms)±10% (µH) ±10% (µH)
priauxsec

110

99.0

0.139

0.656

Leakage
L (µH)50.016

1. When ordering, please specify a packaging code:
Packaging:

C1023-ALD
D = 13″ machine ready reel. EIA-481 embossed plastictape (175 per full reel). Quantities less than full reelavailable: in tape (not machine ready) or with leader
and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our partnumbering system, Coilcraft is eliminating the needfor multiple packaging codes. When ordering, simply
change the last letter of your part number from B to D.

Dot indicates pin 1
1

120.1303,30

6

1 : 0.69

10.0501,27Recommended
Land Pattern
71.181 max
30,00

1 : 0.19

0.827
21,00
0.969
24,60

70

1.5

Isolation8(Vrms)
1500

4

1211
10Pri

Sec

698
7

1
0.118
3,00.118
3,0Aux3

Parts manufactured priorto December 2011 may
be marked differently.

Secondary windings to be connectedin parallel on PC board.

0.450max
11,430.080
2,03Capacitance7 Ipk3(pF)(A)

2. Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc.
3. Ipk is the peak current drawn at minimum input voltage.
4. DCR for the secondary is per winding.
5. Leakage inductance is for the primary winding with all other pins
shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Capacitance measured between pins 3 and 4 with other pins shorted.
8. Isolation is measured from the primary and aux to the secondary.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.930
23,62C1023-AL

XXXXY

0.810
max
20,57

0.028
0,711

1.40

Turns ratio6
pri : sec pri : aux

0.004 /0,10

Dimensions are ininches
mmUS +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 423

Revised 07/23/21© Coilcraft Inc. 2021
This product may not be used in medical or highrisk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.