PLN Series Planar Transformers for PoE


Model PLN Series Planar Transformers are designed for PoE applications from 48 to 70 W requiring a low profile and high power density. The planar transformers are forward converter transformers operating at a switching frequency of 250 kHz with low leakage inductance from 0.29 to 0.6 μH.


The available output voltages are 5 and 12V with output current from 4 to 14 A, all of which can withstand hi-pot at 1,750V DC. The operating temperature range is from -40 to 257°F (-40 to +125°C) for these low-profile, RoHS-compliant, surface mount components.


The PLN Series can be used in many applications, including forward transformers for PoE applications, industrial power systems, Switched-Mode Power Supplies (SMPS), LED lighting, and Battery Management Systems (BMS).


  • DC-DC transformer for a 48 to 70-W forward converter
  • Low leakage inductance from 0.29 to 0.6 μH
  • Low-height profile component
  • Surface mount
  • Operating temperature: -40 to 257°F (-40 to +125°C)
  • RoHS compliant


  • Transformer for PoE applications
  • Industrial power systems
  • Switched-Mode Power Supplies (SMPS)
  • LED lighting
  • Battery Management Systems (BMS)
  PLN048-ED21A12S  PLN050-ED21A05S  PLN070-ED21A05S 
 Size0.9 x 1 x 0.4 in. (23 x 26 x 10 mm)
 Input Voltage33 to 57V DC
 Output Voltage12V DC5V DC5V DC
 Output Current4 A10 A14 A
 Frequency250 kHz
 Primary/Secondary   Turns Ratio1.6:14:14:1
 Primary Inductance90 µH153 µH150 µH
 Leakage Inductance 0.3 µH0.4 µH0.6 µH
 Hi-Pot1,750V DC
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