Flyback Transformer
Document 457
Document 457 Revised 4/30/2015
1. When ordering, please specify packaging code:
C1154-BLD
Packaging: D = 13″ machine ready reel. EIA-481 embossed plastic
tape (200 parts 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.
Inductance Inductance Leakage
Part at 0 A2 at Ipk3 DCR max (Ohms) inductance4 Turns ratio
Ipk3
number1 ±10% (µH) min (µH) N1 N2 N3 N4 N5 max (µH) N1
:
N2
:
N3
:
N4
:
N5 (A)
C1154-BL_ 255.0 229.5 0.335 0.020 0.017 0.200 0.745 5.0 1 : 0.1 : 0.075 : 0.125 : 0.425 0.25
For Maxim MAX5941A
PoE Interface/PWM Controller
1
12
N
Primary
1
8
7
9
5
6
4
N
Secondar
y
3.3 V
2
N
Secondar
y
2.5 V
3
N
Drive
5V
4
11
2
N
Bias
5
0.865
21,97
0.590
14,98
0.677
17,20
0.028
0,72
max
Dot indicates pin 1
Internal code
max
112
670.135
3,43
0.07
1,79
11
2
0.665
16,88 0.098
2,5
0.098
2,5
Recommended
Land Pattern
0.340
8,64
0.079
2,01
0.693
17,60
max
0.004 /0,10
Partsmanufactured prior
to December 2011 may
be markeddifferently.
C1154-BL
XXXXY
2. Inductance is for the primary, measured at 275 kHz, 1.0 Vrms.
3. Peak primary current drawn at minimum input voltage.
4. Leakage inductance is for the primary winding with the secondary wind-
ings shorted.
5. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Core material Ferrite
Terminations RoHS tin-silver (96.5/3.5) over tin over nickel over phos
bronze. Other terminations available at additional cost.
Weight 4.9 g
Ambient temperature –40°C to +125°C
Storage temperature Component: –40°C to +125°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 200 per 13″ reel Plastic tape: 44 mm wide,
0.35 mm thick, 28 mm pocket spacing, 9.6 mm pocket depth
PCB washing Tested to MIL-STD-202 Method 215 plus an additional
aqueous wash. See Doc787_PCB_Washing.pdf.
• Dual-output continuous-current flyback transformer
• Operates with 18 – 72 Volts input
• 1500 Vrms, one minute isolation between the primary and the
secondary
Dimensions are in inches
mm
