Document 452

SMT Power Transformer

For Linear Technology LT1725
Isolated Flyback Controller• Can be used in isolated and non-isolated designs• Operates with 36–72 Volts input; can be used for PoE.
• 1500 Vrms, one minute isolation between the primary and thesecondaryCore material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phosbronze. Other terminations available at additional cost.
Weight 5.1 g
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°CResistance 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 200 per 13″ reel Plastic tape: 44 mm wide,
0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additionalaqueous wash. See Doc787_PCB_Washing.pdf.						 Leakage		Turns ratio	 DCR max (Ohms)
Part		L at 0 A2
L at Ipk3
L max5
Ipk3
number1 Power ±10% (µH)
min (µH)pri
sec4bias(µH)
pri : sec6 pri : bias (A)C1048-AL_

13 W

94.0

84.6

0.210

0.01

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

1C1048-ALD
D = 13″ machine ready reel. EIA-481 embossed plastic
tape (200 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
0.028
0,72
12C1048-AL

0.677
max
17,20

3.9

Recommended
Land Pattern

120.07
1,79
0.098
2,50.335
max
8,51
0.590
14,98
0.693
17.60

1.2

5 V, 2 A

2109Primary

Secondary

4

1112

6

7

0.865
max
21,97

1 : 0.12   1 : 0.47

2. Inductance is for the primary, measured at 250 kHz, 0.3 Vrms, 0 Adc.
3. Peak primary current drawn at minimum input voltage.
4. DCR is for both windings of the secondary connected in parallel.
5. Leakage inductance is for the primary winding with the secondary windings shorted.
6. Turns ratio is with the secondary windings connected in parallel.
7. Output is with the secondary windings connected in parallel. Output ofthe bias winding with a 15 V, 0.2 A.
8. Operating temperature range –40°C to +125°C.
9. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.

XXXXY
60.0792,0110.098
2,50.453

Output70.135
3,430.665
16,88

Bias1Parts manufactured priorto December 2011 may
be marked differently.

Secondary windings to be connected inparallel on PC board

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 452

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.