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Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors


Flyback Transformer

RoHS compliant
  • Developed for Linear Technology LTC3300‑1 Bidirectional Cell Balancer

Buy Now:
Count Unit price
1 $3.20
175 $2.75
700 $2.39
1400 $1.88
2800 $1.61
5000 $1.48

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

. in stock, ready to ship today.
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Electrical specifications at 25°C.

Part number 1
(Hover for schematics)
at 0A (µH) 2
(Tolerance: ±15%)
min at   10 A (µH)
DCR max (Ω) 3 Leakage
max (µH) 4
Turns Ratio 5 Current (A) 6 Isolation
Voltage (Vrms) 7
Pri Sec Pri : Sec
MA5421-AL_ 3.4 2.8 0.009 0.011 0.15 1 : 1 3.3 1500
  1. When ordering, please specify packaging code: e.g. MA5421-ALD
  2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc.
  3. DCR is for the windings connected in parallel, 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 is measured with the secondary windings shorted.
  5. Turns ratio is with the primary windings and the secondary windings connected in parallel.
  6. 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.
  7. Isolation:1500 Vrms, one minute primary to secondary; 500 Vrms, one minute between windings of the primary and the secondary


  • RoHS tin-silver (96.5/3.5) over tin over nickel over phos bronze. Other terminations available at additional cost.


  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (175 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
  • B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.
RoHS compliant
Ambient temperature range:
−40°C to +85°C with Irms current.
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+125°C (Ambient + temperature rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Primary windings and secondary
windings to be connected in parallel
on the PC board

Physical characteristics


Tape and Reel specification

Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_f.gif
175 330 100 13 38,4 32,4 32 28 4 2 12,93 0,6

General specification

Core Material:
6.0 g
175 per 13″ reel Plastic tape: 32 mm wide, 0.6 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth.


Moisture Sensitivity Level (MSL):
1 (unlimited floor life at <30°C / 85% relative humidity)
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.
Refer to Soldering Coilcraft Components before soldering.
PCB Washing:
Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.