BLF978P 1200W HF–700MHz LDMOS Transistor
BLF978P 1200W HF–700MHz LDMOS Transistor
The Ampleon BLF978P is a high-power HF/VHF LDMOS transistor developed for broadcast transmitters and industrial RF power systems. It is designed for broadband operation from 10MHz to 700MHz and provides a nominal output power of 1200W under Ampleon’s specified pulsed test conditions.
Operating from a typical 50V drain supply, the BLF978P combines high power gain, high drain efficiency, excellent thermal stability and strong load-mismatch ruggedness. These characteristics make it suitable for high-power RF amplifier designs used in broadcast, ISM and other demanding RF energy applications.
BLF978P Key Specifications
| Parameter | Specification |
| Manufacturer | Ampleon |
| Part Number | BLF978P |
| Orderable Part Number | BLF978PU |
| Technology | LDMOS |
| Device Configuration | Dual, common source |
| Frequency Range | 10–700MHz |
| Nominal Output Power | 1200W |
| Typical Drain Voltage | 50V |
| Typical Power Gain | 24.5dB at 225MHz |
| Minimum Power Gain | 23dB at 225MHz |
| Typical Drain Efficiency | 80.6% at 225MHz |
| Minimum Drain Efficiency | 78% at 225MHz |
| Typical Input Return Loss | −20dB |
| Maximum Drain-Source Voltage | 108V |
| Typical Thermal Resistance | 0.121K/W |
| Package | ACC-1230 / SOT539A |
Typical RF Performance
The BLF978P can be adapted to multiple operating frequencies through an appropriate RF matching network. Ampleon publishes the following representative application results:
| Frequency | Signal Type | Drain Voltage | Output Power | Power Gain | Drain Efficiency |
| 225MHz | CW pulsed | 50V | 1200W | 25.5dB | 80.00% |
| 352MHz | CW pulsed | 50V | 1150W | 25.0dB | 79.60% |
| 352MHz | CW | 50V | 1150W | 23.6dB | 76.70% |
| 500MHz | CW | 45V | 800W | 22.3dB | 71.60% |
| 650MHz | CW | 50V | 1000W | 20.0dB | 66.20% |
Typical Applications
The BLF978P can be used in high-power RF amplifier systems for:
FM and VHF broadcast transmitters
Digital television transmitters
Industrial RF generators
Scientific RF equipment
Medical RF systems
Plasma generation
Particle accelerator RF amplifiers
RF heating and material processing
Navigation and safety-radio equipment
Broadband HF and VHF power amplifiers
Ampleon officially positions the device for broadcast transmitter applications and industrial, scientific and medical equipment.
FAQ
What is the frequency range of the BLF978P?
The BLF978P is designed for broadband operation from 10MHz to 700MHz.
What is the output power of the BLF978P?
The device has a nominal output power of 1200W under the manufacturer’s specified CW-pulsed test conditions at 225MHz. Different power levels are published for CW operation at higher frequencies.
What is the typical gain of the BLF978P?
At 225MHz and 1200W pulsed output, the typical power gain is 24.5dB, with a specified minimum of 23dB.
Is the BLF978P suitable for continuous-wave operation?
Yes. Ampleon publishes CW application results at 352MHz, 500MHz and 650MHz. Output power and efficiency vary according to frequency and amplifier design.
Is the BLF978P internally matched?
The BLF978P is intended for broadband amplifier designs using an external RF matching network. Designers should use the manufacturer’s impedance data, models and available application reports when developing the circuit.
What is the orderable part number?
The active orderable part number is BLF978PU, supplied in the ACC-1230/SOT539A ceramic flanged package.
