Document 1409
For Silicon Labs Si88xxx 5kV
Isolated DC-DC Converter
Flyback Transformer
• Developed for use with Silicon Labs Si88xxx isolated dc-dc-
converter reference designs.
AEC
+
Q200 125°C
• 5000 Vrms, one minute isolation from primary to secondary
• Designedtomeetreinforcedinsulationclasswith8mmcreepage
and clearance.
• AEC-200 Grade 1 (–40°C to +125°C)
Core material Ferrite
Terminations RoHS tin-silver-copper (95.5/3.8/0.7) over tin over
nickel over phos bronze.
Weight 1.1 g
Ambient temperature –40°C to +125°C
Maximum part temperature +160°C
Storage temperature Component: –40°C to +160°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)
Packaging 700 per 13″ reel Plastic tape: 32 mm wide, 0.40 mm thick,
16 mm pocket spacing, 5.72 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
DCR max4
Leakage
(Ohms)
Part
Input
Inductance2 inductance3
Turns ratio Isolation5 Isat6
number1 voltage (V)
±±5 (ꢀµ)
max (ꢀµ)
pri
sec
pri:sec
(Vrms)
(A) Output
UA7902-AL_
7 – 24
25.0
0.971
0.075
0.106
3:1
5000
1.3
5 V, 0.4 A
1. When ordering, specify a packaging code:
UA7902-ALD
0.672
17,07
0.028
0,70
max
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape. Quantities less than full reel available: in tape
(not machine ready) or with leader and trailer ($25
charge).
5
8
4
0.394
10,00
max
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.
1
0.079
2,00
Dot indicates pin 1
max
Internal code
2. Inductance is for the primary, measured on an Agilent/HP 4284 at 250 kHz,
0.1 Vrms, 0 Adc.
3. Leakage inductance measured between pins 1 and 3 at 250 kHz, 0.1Vrms,
0 Adc with all secondary pins shorted.
0.235
5,97
4. DCR for secondary is for the windings connected in parallel.
5. Isolation (hipot) measured between windings for one minute.
6. DC current that causes an inductance drop of 30% (typ) from its value
without current
7. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
0.004/0,10
0.067
1,70
0.555
14,1
7
Recommended
Land Pattern
0.063
1,60
1
8
Sec
(5 V, 0.4 A)
Primary
(7 – 24 Vdc)
1
8
0.079
2,00
3
6
inches
mm
5
Dimensions are in
Secondary windings to be connected
in parallel on PC board.
Document 1409 Revised 07/06/23
US +1-847-639-6400 sales@coilcraft.com
UK +44-1236-730595 sales@coilcraft-europe.com
Taiwan +886-2-2264 3646 sales@coilcraft.com.tw
China +86-21-6218 8074 sales@coilcraft.com.cn
Singapore + 65-6484 8412 sales@coilcraft.com.sg
© Coilcraft Inc. 2023
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.
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