Coilcraft MA5421-AL Flyback Transformer
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MA5421-AL Flyback Transformer

  • Developed for Linear Technology LTC3300‑1 Bidirectional Cell Balancer
  • RoHS-compliant, 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations


Part number1
Click to get parts
at 0A2
±15% (µH)
at Ipk3
min (µH)
DCR max4
L max5
Turns ratio6
pri : sec
Ipk (A)3 Irms (A)7
pri       sec     
MA5421-AL_ 3.4 2.8 0.009 0.011 0.15 1 : 1 10 3.3
1 When ordering, please specify packaging code: e.g. MA5421-ALD


D = 13" machine-ready reel
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 is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc.
3 Ipk is peak primary current drawn at minimum input voltage.
4 DCR is for 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 windings connected in parallel and is measured with the secondary windings shorted.
6 Turns ratio is with the primary windings and the secondary windings connected in parallel.
7 Current that causes a 40°C rise from 25°C ambient, tested with continuous current flowing through all windings. This information is for reference only and does not represent absolute maximum ratings.
8 Isolation:1500 Vrms, one minute primary to secondary; 500 Vrms, one minute between windings of the primary and the secondary
9 Ambient temperature range: −40°C to +85°C with Irms current.
10 Storage temperature range: Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
11 Maximum part temperature: +125°C (Ambient + temperature rise)
12 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.
13 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