A9845, A0027 Planar transformers | Coilcraft
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Surface Mount
Planar Transformers

  • Low profile surface mount planar design, less than 10 mm high
  • Planar technology offers excellent reliability and repeatability
  • Designed for push-pull topologies at 200 – 300 kHz
  • Auxiliary winding can control input to PWMs
  • 1500 Vrms primary/secondary isolation
  • Custom designs available
  • RoHS-compliant. 260°C compatible. Matte tin over nickel over brass terminations.

Photo    Pricing    PDF data sheet


Schematic    Dimensions    Tape and reel specifications    3D models

Part number1
Click for
power (W)
range (V)
(A rms)
min (mH)
max (µH)

DCR max (Ohms)3

pri sec aux
A9845-AL_ 10 36 - 75 3.3 2.0 1.50 1.4 0.80 0.0105 0.120
A0027-AL_ 10 36 - 75 3.3 2.0 1.30 3.5 1.13 0.0420 0.331
1 When ordering, please specify packaging code: e.g. A0027-ALD
Packaging: D = 13" reel, machine-ready 
EIA-481 embossed plastic tape (250 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 measured across primary at 250 kHz, 0.1 Vrms, 0 Adc.
3 DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
4 Ambient temperature range: −40°C to +85°C
5 Storage temperature range: Component: −40°C to +85°C
Tape and reel packaging: −40°C to +80°C
6 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.
7 Electrical specifications at 25°C.
Refer to Soldering Coilcraft Components before soldering.
PCB washing: Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.

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Updated: February 21, 2019