RA6998-BL Forward Mode Planar Transformer for Maxim MAX17599 PWM Controller
Inductor Finders Power  |   RF
Power Magnetics Tools
RF Inductor Tools
CM Choke \ Ferrite Beads
LC Filter Designer
IC / Inductor Match Tool
Application Notes
Other Resources
Designer's Kits

Forward Mode Planar Transformer for
Maxim MAX17599 PWM Controller

  • Developed for use with Maxim MAX17599 Active Clamp Current-Mode PWM Controller.
  • Designed for forward topology operating at 250 kHz with an input range of 18 – 36 V.
  • 1500 Vrms isolation from primary to secondary and gate
  • RoHS-compliant  260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations


Part number1
Click to get parts
at 0A2
±20% (µH)
DCR max (mOhms)3 Leakage
max (µH)
range (V)
Turns ratio Output5
pri sec gate pri : sec pri : gate
RA6998-BL_ 80 15.0 22.0 45.0 0.35 18 – 36 1 : 1.125 1 : 0.375 12 V, 3.3 A
1 When ordering, please specify packaging code: e.g. RA6998-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.
2 Inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc.
3 DCR for the secondary is measured with the windings connected in parallel. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Leakage inductance is for the primary winding with the secondary windings shorted.
5 Output is of the secondary winding. Gate winding output is 4 V, 0.25 A.
6 Ambient temperature range: −40°C to +85°C
7 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
8 Maximum part temperature: 125°C (ambient + temp rise)
9 Resistance to soldering heat: Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
10 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.

Your comments and suggestions are welcome. Contact [email protected]
Copyright © 2020, Coilcraft, Inc.   Privacy policy
Updated: April 16, 2018