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GA3429-BL Flyback Transformer

for Linear Technology LT3573

RoHS compliant
  • Developed for Linear Technology LT3573 Isolated Flyback Converter
  • Can also be used in PoE applications
  • Bias winding provides power to the chipset
Buy Now:
Count Unit price
1 $3.22
250 $2.75
500 $2.40
1000 $1.88
2500 $1.61
5000 $1.47

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

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

Typical Application

Works with ADIPowerbyLinear LT3573

Input Voltage Output 1 Power Fsw
Sec Bias
20 V 28 V 3.3 V , 1.5 A 3.3 V , 0.02 A 5 W 250 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
at 0A (µH) 3
(Tolerance: ±10%)
min at   2.1 A (µH)
DCR max (mΩ) 4 Leakage
max (µH) 5
Turns Ratio 6 Isolation
Voltage (Vrms) 7
Pri Sec Bias Pri : Sec : Bias
GA3429-BL_ 24.0 21.6 95.0 7.5 123 0.566 1 : 0.25 : 0.25 1500
  1. Output is with the secondary windings connected in parallel. Bias winding output: 3.3 V, 20 mA.
  2. When ordering, please specify packaging code: GA3429-BLD.
  3. Inductance is for the primary, measured at 250 kHz, 0.3 Vrms, 0 Adc.
  4. DCR for the secondary is per winding.
  5. Leakage inductance measured between pins 3 and 4 with all secondary pins shorted.
  6. Turns ratio is with the secondary windings connected in parallel.
  7. 1500 Vrms isolation from primary and bias to secondary;
    500 Vrms isolation from primary to bias, tested for one minute.


  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.


  • 13" reel, machine-ready 
    EIA-481 embossed plastic tape (250 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 +85°C
Storage temperature range:
Component: –40°C to +85°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 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_f-(1).gif
250 330 100 13 38,4 32,4 32 20 4 2 11,2 0,5

General specification

Core Material:
3.9 to 4.1 g
250 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 20 mm pocket spacing, 11.2 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. For other solvents, see Doc787_PCB_Washing.pdf

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