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SMT Planar Transformer for
Texas Instruments UCC2897

  • Developed for TI UCC2897 Current Mode Active Clamp PWM Controller (PMP9720 reference design)
  • Designed for forward topology operating at 200 kHz with an input range of 48 – 60 V.
  • 1500 Vrms, one minute isolation hipot) from primary to secondary
  • RoHS-compliant  260°C compatible. Matte tin over nickel over brass terminations


Part number
Click to get parts
Turns Inductance1
±20% (µH)
max (µH)
DCR max (mOhms)3 Volt-time
product (typ)4
N1 N2 Sec Aux pri sec aux
RA7040-AL 6 6 3 3 50 0.55 10.75 4.25 61.1 100 12 V, 13 A
1 Inductance is for the primary, measured on Agilent/HP 4284A at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel.
2 Leakage Inductance is for the primary, measured at 200 kHz, 0.5 Vrms, 0 Adc with primary windings connected in parallel and all secondary pins shorted.
3 DCR for the primary is measured with the windings connected in parallel. DCR at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Volt-time product is based on primary windings connected in parallel.
5 Output is of the secondary winding frmo pins 11 – 8. Output of the aux winding is 12 V.
6 Ambient temperature range: −40°C to +125°C
7 Storage temperature range: Component: −40°C to +165°C
Tape and reel packaging: −40°C to +80°C
8 Maximum part temperature: 165°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.

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Updated: April 11, 2017