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Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

C1048 PoE Transformer

for Linear LT1725 Flyback Controller

RoHS compliant
  • Developed for Linear LT1725 Isolated Flyback Controller
  • Can be used in isolated and non-isolated designs and in PoE applications
  • Interleaved secondary windings
  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations.
Buy Now:
Count Unit price
1 $5.04
200 $3.78
600 $2.27
1200 $1.77
2400 $1.51
5000 $1.39

For high volume or non-stock items, request a quote.

. in stock, ready to ship today.
Request a Sample:

Typical Application

Works with Texas Instruments LM5071/LM5072

Input Voltage Output 1 Power Fsw
Sec Bias
36 V 72 V 5 V , 2 A 15 V , 0.2 A 13 W 250 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
at 0A (µH) 3
(Tolerance: ±10%)
min at   1.2 A (µH)
DCR max (Ω) 4 Leakage
max (µH) 5
Turns Ratio 6 Isolation
Voltage (Vrms) 7
Pri Sec Bias Pri : Sec : Bias
C1048-AL_ 94 85 0.210 0.010 0.453 3.9 1 : 0.12 : 0.47 1500
  1. Output is with the secondary windings connected in parallel. Output of the bias winding with a 15 V, 0.2 A
  2. When ordering, please specify packaging code: e.g. C1048-ALD
  3. Inductance is for the primary, measured at 250 kHz, 0.3 Vrms, 0 Adc.
  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. 1500 Vrms, one minute primary to secondary isolation.


  • RoHS tin-silver (96.5/3.5) over tin over nickel over phos bronze. Other terminations available at additional cost.


  • D = 13" machine-ready reel
    EIA 481 embossed plastic tape (200 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.
RoHS compliant
Ambient temperature range:
40°C to +125°C
Storage temperature range:
Component: –40°C to +125°C
Tape and reel packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Secondary windings to be connected
in parallel on PC board

Physical characteristics



Tape and Reel specification


Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_c.gif
175 330 100 13 50,4 44,4 44 32 4 2 11,9 0,4

General specification

Core Material:
5.1 g
200 per 13″ reel Plastic tape: 44 mm wide, 0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
Resistance to soldering heat:
Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested with pure water or alcohol only. More info.

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