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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

CX9721-AL Flyback Transformer

for TI TPS61046

RoHS compliant
  • Developed for the Texas Instruments Isolated Flyback DC-DC converter reference design (PMP9801) based on the TPS61046 boost converter.
  • Output of the auxiliary winding is 5 V, 2 mA, used to power the IC

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Typical Application

Works with Texas Instruments TPS61046

Input Voltage Output Power Fsw
Sec Bias
5 V 20 V 5 V , 0.25 A 5 V , 0 A 0.25 W 100 kHz


Electrical specifications at 25°C.

Part number 1
(Hover for schematics)
at 0A (µH) 2
(Tolerance: ±10%)
min at   1 A (µH)
DCR max (Ω) Leakage
max (µH) 3
Turns Ratio Isolation
Voltage (Vrms) 4
Pri Sec Bias Pri : Sec : Bias
CX9721-AL_ 10 8.0 0.08 0.08 0.08 0.16 1 : 1 : 1 4000
  1. When ordering, please specify packaging code: e.g.CX9721-ALD
  2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc.
  3. Leakage inductance measured at 100 kHz, 0.1 Vrms, between pins 1 and 2 with all other pins shorted.
  4. 4000 Vrms, one minute isolation from the primary and auxiliary winding to the secondary.


  • RoHS-compliant. 260°C compatible. RoHS tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations.


  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (700 parts per full reel).
  • 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 +160°C.
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+160°C (ambient + temp rise).
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



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 cx9721orientation.gif
700 330 100 13 38,4 32,4 32 16 4 2 5,72 0,40

General specification

Core Material:
1.08 g
700 per 13″ reel Plastic tape: 32 mm wide, 0.40 mm thick, 16 mm pocket spacing, 5.72 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 to MIL-STD-202 Method 215 plus an additional aqueous wash. More Info.