Document 309 -1
Flyback Transformer ForTexasInstruments
LM5000 DC/DC Regulator
This surface mount flyback transformer is designed for
use with Texas Instruments LM5000 DC/DC regulator.
The core completely encloses the windings to minimize
EMI interference.The transformer features very low DCR,
500 Vrms isolation and a leakage inductance rating of just
1.0 µH. Coilcraft can also custom engineer a transformer
to meet your specific requirements.
For free evaluation samples, contact Coilcraft or order them
on-line at www.coilcraft.com.
Input DCR max Inductance3
Part number1 Pins 1 – 4 Pins 2 – 3 voltage (V) Output
18 – 55 3.3 V @ 3 A 0.150 (1 – 4)
0.150 (2 – 3)
0.012 (5,6 – 7,8)
Turns ratio Isolation4
in : out : aux (Vrms)
1 : 0.33 : 1
1. When ordering, please specify a packaging code:
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (150 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 100 kHz, 0.1 Vrms, 0 Adc.
3. Leakage inductance measured at 100 kHz, 0.1 Vrms from pins 1 to 4
with all other pins shorted.
4. Isolation measured from pin 1 to pins 5 and 6; from 2 to 5 and 6; and
from pins 1, 2, 5 and 6 to the core for one minute.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Core material Ferrite
Terminations RoHS tin-silver over tin over nickel over phos bronze.
Other terminations available at additional cost.
Weight 7.86 g
Ambient temperature –40°C to +85°C
Storage temperature Component: –40°C to +85°C.
Tape and reel 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 150 per 13″ reel Plastic tape: 44 mm wide, 0.5 mm thick,
28 mm pocket spacing, 13.8 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
US +1-847-639-6400 email@example.com
UK +44-1236-730595 firstname.lastname@example.org
Taiwan +886-2-2264 3646 email@example.com
China +86-21-6218 8074 firstname.lastname@example.org
Singapore + 65-6484 8412 email@example.com
Document 309-1 Revised 02/22/17
© 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.