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Document 901
Flyback Transformers ForMicrochipGrid-Connected
Solar Microinverter using dsPIC
• Listed on Bill of Material for Reference Design AN1338
• Input voltage: 22 Vdc – 55 Vdc
• 3000 Vrms, one minute isolation from primary to secondary
windings
Core material Ferrite
Terminations  RoHS tin-silver (96.5/3.5) over tin cover copper-plated
steel wire
Weight  94.3 g
Ambient temperature  –40°C to +85°C
Storage temperature  Component: –40°C to +85°C.
Tray packaging: –40°C to +80°C
Resistance to soldering heat  Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL)  1 (unlimited floor life at <30°C /
85% relative humidity)
Failures in Time (FIT) / Mean Time Between Failures (MTBF)
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332
Packaging  20 per tray
PCB washing  Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
Part
number
JA4635-AL
KA4823-CL
Indautc 0t aAn1c e DCR m ax (Ohms)2 SRF typ
±10% (µH)
pri    sec
(kHz)
28
0.008 0.106
640
28
0.008 0.472
360
Leakage
inductance3 Turns ratio4Isat5
max (µH)
pri : sec (A)
Output
0.138
0.115
1 : 6
1 : 12
10.5   110 Vac
10.5   220 Vac
1. Inductance is measured at 150 kHz, 0.1 Vrms.
2. DCR is with the secondary windings connected in parallel.
3. Leakage inductance is for the three windings of the primary with the
secondary windings shorted.
4. Turns ratios are with the primary and secondary windings connected in
parallel.
5. DC current at which the inductance drops 10% (typical) from its value
without current.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Dimensions are in
inches
mm
US +1-847-639-6400 sales@coilcraft.com
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Singapore + 65-6484 8412 sales@coilcraft.com.sg
Document 901  Revised 10/11/11
© Coilcraft Inc. 2017
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.