Coilcraft GA3136-BL Flyback Transformer for TI UCC1809/2809/3809 Primary Side Controller
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SMT Flyback Transformer for
Texas Instruments UCC1809/2809/3809 Primary Side Controller

  • Developed for TI UCC1809/2809/3809 Primary Side Controller
  • Designed for 50 W dc-to-dc fixed frequency current mode switching power supplies
  • 1500 Vrms, one minute isolation from primary to secondary windings
  • 22 – 26 V input; 53 V, 1.0 A output
  • 12 V, 20 mA bias winding output
  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number
Click to get parts
at 0A2
±10% (µH)
at Ipk3
min (µH)
DCR max4
max (µH)
Turns ratio6 Ipk3
pri : sec pri : bias
GA3136-BL 35.0 31.5 0.029 (pri)
0.074 (sec)
0.208 (bias)
0.230 1 : 1.40 1 : 0.33 5.9 53 V, 1.0 A
1 Inductance is for the primary, measured at 150 kHz, 1.0 Vrms.
2 Ipk: Peak primary current drawn at minimum input voltage.
3 DCR for the primary is measured with the windings connected in parallel. DCR is measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary windings connected in parallel and with the secondary winding shorted.
5 Turns ratios are for the primary windings connected in parallel. 
6 Output is for the secondary winding. Bias winding output is 12 V, 20 mA.
7 Ambient temperature range: −40°C to +125°C
8 Storage temperature range: Component: −40°C to +125°C
Packaging trays: −40°C to +80°C
9 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.
10 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.

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Updated: April 16, 2018