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MA5237-EL Flyback Transformer

for Maxim MAX5941B PWM Controller

RoHS compliant
  • Improved version of the MA5237-AL with lower leakage inductance and better winding parasitics
  • Flyback transformer developed for Maxim for the MAX17498B Evaluation Kit

Buy Now:
Count Unit price
1 $5.30
200 $5.49
600 $2.99
1200 $2.61
2400 $2.23
4800 $2.04

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

. in stock, ready to ship today.
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Typical Application

Works with Maxim MAX17498B

Input Voltage Output 1 Power Fsw
Sec Aux
18 V 36 V 5 V , 1.5 A 2.5 V , 0.02 A 7.5 W 500 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
at 0A (µH) 3
(Tolerance: ±10%)
min at   1.5 A (µH) 4
DCR max (Ω) 5 Leakage
max (µH) 6
Turns Ratio 7 Isolation
Voltage (Vrms) 8
Pri Sec Aux Pri : Sec : Aux
MA5237-EL_ 60.0 54.0 0.110 0.035 0.170 0.565 1 : 0.5 : 0.25 3500
  1. Output of the secondary is with the windings connected in parallel. Aux winding output is 2.5 V, 20 mA.
  2. When ordering, please specify packaging code: e.g. MA5237-ELD
  3. Inductance is for the primary, measured at 500 kHz, 0.1 Vrms.
  4. Peak primary current drawn at minimum input voltage.
  5. DCR for the secondary is measured with the windings connected in parallel. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
  6. Leakage inductance is for the primary winding with the secondary windings shorted.
  7. Turns ratios are with the secondary windings connected in parallel. 
  8. 3500 Vrms, one minute isolation primary to secondary windings.


  • RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.


  • D = 13″ machine ready reel. EIA-481 embossed plastic tape (200 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
Storage temperature range:
Component: –40°C to +125°C.
Tape and reel packaging: –40°C to +80°C
Maximum part temperature:
+125°C (ambient + temp rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):


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_c.gif
200 330 100 13 50,4 44,4 44 24 4 2 11.5 0,4

General specification

Core Material:
7.1 g
200 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 24 mm pocket spacing, 11.5 mm pocket depth


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 to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.