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Designer's Kits

Flyback Transformers for
STMicroelectronics

  • Designed for STMicroelectronics
  • 1500 Vrms isolation from primary and auxiliary to secondary
  • Operates at 250 kHz
  • Versions for 3.3 V and 5.0 V output
  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations.

SPECIFICATIONS


Part number1
Click to get parts
L at 0 A2
±10% (µH)
L at Ipk3
min (µH)
DCR max
(mOhms)4
Leakage L5
max (µH)
Turns ratio6 Ipk3
(A)
Output7
GA3278-BL_ 70.0 63.0 pri 
sec 
drive 
aux 
60.0
6.0
11
280
2.10 pri : sec
pri : drive
pri : aux
8.66 : 1
4.33 : 1
3.25 : 1
0.9 3.3 V, 9 A
HA3692-BL_ 70.0 63.0 pri 
sec 
drive 
aux 
82.5
9.0
110
310
1.35 pri : sec 
pri : drive 
pri : aux 
5.80 : 1
4.14 : 1
3.22 : 1
0.9 5.0 V, 6 A
1 When ordering, please specify packaging code: e.g. HA3692-BLD
Packaging: D = 13" reel, machine-ready 
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.
2 Inductance measured at 250 kHz, 0.2 Vrms, 0 Adc
3 Ipk is peak primary current drawn at minimum input voltage.
4 DCR for the primary and the secondary is with windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
5 Leakage inductance is for the primary and is measured with the secondary and drive windings shorted.
6 Turns ratios are with the primary and secondary windings connected in parallel.
7 Output is with the secondary windings connected in parallel.
Auxiliary winding output:10 V. Drive winding output: 7 V
8 Ambient temperature range: −40°C to +125°C
9 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
10 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
11 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

Your comments and suggestions are welcome. Contact [email protected]
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Updated: April 16, 2018