This product is not recommended for design-in.
The recommended type is: BLF188XRS

Power LDMOS transistor

A 1400 W extremely rugged LDMOS power transistor for broadcast and industrial applications in the HF to 500 MHz band. This product is an enhanced version of the BLF578 using Ampleon's XR process to provide maximum ruggedness capability in the most severe applications without compromising the RF performance.

Features and benefits

  • Easy power control
  • Integrated ESD protection
  • Excellent ruggedness
  • High efficiency
  • Excellent thermal stability
  • Designed for broadband operation (HF to 500 MHz)
  • Compliant to Directive 2002/95/EC, regarding Restriction of Hazardous Substances


  • Industrial, scientific and medical applications
  • Broadcast transmitter applications


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Design tool

RF Power Lifetime Calculator


Power LDMOS transistor



Symbol Parameter Conditions Min Typ/Nom Max Unit
frange frequency range 10 500 MHz
PL(1dB) nominal output power at 1 dB gain compression 1400 W
Test signal: Pulsed RF
Gp power gain VDS = 50 V; f = 225 MHz; IDq = 40 mA; PL = 1400 W [0] 22 23.5 dB
RLin input return loss VDS = 50 V; IDq = 40 mA; PL = 1400 W [0] -17 -13 dB
ηD drain efficiency VDS = 50 V; f = 225 MHz; IDq = 40 mA; PL = 1400 W [0] 65 69 %
PL output power VDS = 50 V; f = 225 MHz [0] 1400 W

Package / Packing

All type numbers in the table below are not recommended for design-in.

Type number Package Outline version Reflow-/Wave
Packing Product status Marking Orderable part number,
(Ordering code (12NC))
sot539b_po Bulk Pack Active Standard Marking BLF578XRS,112
(9340 664 66112)

Pinning info

Pin Symbol Description Simplified outline Graphic symbol
1 D1 drain1
2 D2 drain2
3 G1 gate1
4 G2 gate2
5 S souce


All type numbers in the table below are not recommended for design-in.

Type number Orderable part number Chemical content RoHS / RHF Leadfree conversion date MSL MSL LF
BLF578XRS BLF578XRS,112 BLF578XRS Always Pb-free 1 1
Quality and reliability disclaimer

Ordering & availability

Type number Ordering code (12NC) Orderable part number Distributor Buy online Samples
BLF578XRS 9340 664 66112 BLF578XRS,112 DigiKey Buy Not available

Design support