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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
5 V 20 V 5 V , 0.25 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.


  • 13" reel, machine-ready 
    EIA-481 embossed plastic tape (700 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 +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.