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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

C1099 Flyback Transformer

for Maxim MAX5941A PoE Interface

RoHS compliant
  • Developed for Maxim MAX5941A PoE Interface/PWM Controller
  • Interleaved primary and secondary windings
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations

Buy Now:
Count Unit price
1 $3.37
200 $2.89
600 $2.52
1200 $1.97
2400 $1.68
5000 $1.54

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

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

Typical Application

Works with Maxim MAX5941A

Input Voltage Output 1 Power Fsw
Sec Bias
32 V 56 V 3.3 V , 2.5 A 14 V 8.25 W 300 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
at 0A (µH) 3
(Tolerance: ±5%)
min at   0.9 A (µH)
DCR max (Ω) 4 Leakage
max (µH) 5
Turns Ratio 6 Isolation
Voltage (Vrms) 7
Pri Sec Bias Pri : Sec : Bias
C1099-AL_ 133 126 0.283 0.013 0.480 3.5 1 : 0.13 : 0.57 1500
  1. Output of the secondary is with the windings connected in parallel. Bias winding output is 14 V.
  2. When ordering, please specify packaging code: e.g. C1099-ALD
  3. Inductance is for the primary, measured at 300 kHz, 1.0 Vrms.
  4. Primary DCR is measured with the windings connected in series. Secondary DCR is measured with the windings connected in parallel.
  5. Leakage inductance is for the primary winding with the secondary winding shorted.
  6. Turns ratio is for the primary connected in series and the secondary connected in parallel.
  7. 1500 Vrms, one minute primary to secondary isolation.
    500 Vrms, one minute primary to bias isolation.


  • RoHS tin-silver over tin over nickel over phos bronze. Other terminations available at additional cost.


  • D = 13″ machine ready reel. EIA-481 embossed plastic tape (200 per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D
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):



Primary windings to be connected in series
and secondary windings to be connected in
parallel on the 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-(1).gif
200 330 100 13 50,4 44,4 44 28 4 2 9,0 0,37

General specification

Core Material:
5.7 g
200 per 13″ reel Plastic tape: 44 mm wide, 0.37 mm thick, 28 mm pocket spacing, 9.0 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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