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GA3136-BL Flyback Transformer

for Texas Instruments UCC1809/2809/3809 Primary Side Controller

RoHS compliant
  • Developed for TI UCC1809/2809/3809 Primary Side Controller
  • Designed for 50 W dc-to-dc fixed frequency current mode switching power supplies

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Count Unit price
1 $7.37
240 $5.96
480 $4.03
1200 $3.39
2400 $3.07
4800 $2.81

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

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Typical Application

Works with Texas Instruments UCC1809/2809/3809

Input Voltage Output 1 Power Fsw
Sec Bias
22 V 26 V 53 V , 1 A 12 V , 0.02 A 50 W 150 kHz


Electrical specifications at 25°C.

Part number
(Hover for schematics)
at 0A (µH) 2
(Tolerance: ±10%)
min at   5.9 A (µH) 3
DCR max (Ω) 4 Leakage
max (µH) 5
Turns Ratio 6 Isolation
Voltage (Vrms) 7
Pri Sec Bias Pri : Sec : Bias
GA3136-BL 35.0 31.5 0.029 0.074 0.208 0.230 1 : 1.4 : 0.33 1500
  1. Output is for the secondary winding. Output of the bias winding output is 12 V, 20 mA.
  2. Inductance is measured at 150 kHz, 0.1 Vrms.
  3. Peak primary current drawn at minimum input voltage
  4. DCR for the primary is with the windings connected in parallel.
  5. Leakage inductance is for the primary windings connected in parallel and with the secondary winding shorted.
  6. Turns ratios are with the primary windings connected in parallel.
  7. 1500 Vrms, one minute isolation from primary to secondary windings.


  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations. Other terminations available at additional cost.
RoHS compliant
Ambient temperature range:
–40°C to +125°C
Storage temperature range:
Component: –40°C to +125°C.
Tray packaging: –40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Primary windings to be connected
in parallel on the PC board.

Physical characteristics



General specification

Core Material:
27.1 g
24 per tray


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.