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Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors

B0863-B Transformer

for PoE Powered Devices

RoHS compliant
  • Developed for Maxim MAX5941B PoE Interface/PWM Controller
  • IEEE 802.3af compliant PoE forward converter applications
  • Low profile, surface mount transformer
  • 275 kHz switching frequency at a 50% duty cycle

Buy Now:
Count Unit price
1 $4.66
200 $3.99
600 $3.48
1000 $2.71
2000 $2.33
5000 $2.14

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

. in stock, ready to ship today.
Request a Sample:

Typical Application

Works with Maxim MAX5941B

Input Voltage Output 1 Power Fsw
28 V 60 V 3.3 V , 4 A 13 W 10 kHz


Electrical specifications at 25°C.

Part number 2
(Hover for schematics)
min (µH) 3
DCR max (Ω) 4 Leakage
max (µH) 5
Turns Ratio 6 Isolation
Voltage (Vrms) 7
Pri Sec Drive Bias Reset Pri : Sec : Drive : Bias : Reset
B0863-BL_ 165.0 0.061 0.008 0.020 1.290 1.100 0.75 1 : 0.24 : 0.24 : 1.3 : 1 1500
  1. Output is with the the secondary windings connected in parallel.
  2. When ordering, please specify packaging code: e.g. B0863-BLD
  3. Inductance is for the primary, measured at 10 kHz, 0.1 Vrms, 0 Adc.
  4. 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
  5. Leakage inductance is for the primary with all other windings shorted.
  6. Turns ratio is with the secondary windings connected in parallel.
  7. Isolation is measured from the primary, reset and bias windings to the secondary and drive windings.


  • RoHS-compliant. 260°C compatible. Tin-silver 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 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.
RoHS compliant
Ambient temperature range:
–40°C to +85°C
Storage temperature range:
Component: –40°C to +85°C
Tape and reel packaging: –40°C to +80°C
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_v-(2).gif
200 330 100 13 50,4 44,4 44 28 4 2 9,6 0,35

General specification

Core Material:
5.6 g
200 per 13″ reel Plastic tape: 44 mm wide, 0.35 mm thick, 28 mm pocket spacing, 9.6 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 with pure water or alcohol only. More info.