Coilcraft HA3691, JA4173 Flyback Transformers for STMicroelectronics PM8803
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Flyback Transformers for
STMicroelectronics PM8803

  • Designed for 20 Watt applications
  • 1500 Vrms, one minute isolation from primary and bias to secondary
  • Operates in continuous conduction mode at 250 kHz with 42 – 57 V input voltage
  • 10 V, 20 mA bias winding output
  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations.


Part number1
Click to get parts
L at 0 A2
L at Ipk3
min (µH)
DCR max (Ohms)4 Leakage
L max5
Turns ratio6 Ipk3
pri sec bias pri : sec pri : bias
HA3691-AL_ 100 90 0.185 0.0085 0.340 0.805 1 : 0.25 1 : 0.469 1.3 5 V, 4 A
JA4173-AL_ 100 90 0.211 0.0060 0.404 1.60 1 : 0.156 1 : 0.50 1.3 3.3 V, 6 A
1 When ordering, please specify packaging code: e.g. HA-3691-ALD
Packaging: D = 13" reel, machine-ready 
EIA-481 embossed plastic tape (175 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 secondary is with the windings connected in parallel, 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 shorted.
6 Turns ratio is with the secondary windings connected in parallel.
7 Output is with the secondary windings connected in parallel. Auxiliary winding output:10 V, 20 mA.
8 Ambient temperature range: −40°C to +85°C
9 Storage temperature range: Component: −40°C to +85°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.

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Updated: April 16, 2018