Ampleon BLF989 900W 400–860MHz UHF broadcast LDMOS transistor
Mfr. Part #: BLF989
Manufacturer: Ampleon
Product Category: LDMOS RF Power Transistor
Package / Case: SOT539A / ACC-1230 Flanged Ceramic Package
Description: 900W UHF LDMOS RF power transistor designed for 400–860MHz digital and analogue broadcast transmitters, including DVB-T, DVB-T2, Class-AB and Doherty amplifier applications.
Applications: UHF Broadcast, DVB-T/DVB-T2 Transmitters, Analogue TV Transmitters, Doherty Power Amplifiers, Industrial RF Equipment
The Ampleon BLF989 is a high-power LDMOS RF transistor designed for digital and analogue UHF broadcast transmitters. It operates across a broad frequency range from 400MHz to 860MHz and provides a nominal output power of 900W at 1dB gain compression.
The device supports both broadband Class-AB and Doherty amplifier architectures. Its high power gain, good efficiency, integrated ESD protection and strong load-mismatch ruggedness make it suitable for DVB-T, DVB-T2, analogue television and industrial RF power equipment.
Basic Product Information
| Product Field | Details |
| Manufacturer | Ampleon |
| Part Number | BLF989 |
| Orderable Part Number | BLF989U |
| Device Type | UHF LDMOS RF power transistor |
| Frequency Range | 400–860MHz |
| Nominal Output Power | 900W at 1dB compression |
| Typical Drain Voltage | 50V |
| Device Configuration | Dual-section, common-source |
| Package | ACC-1230 / SOT539A |
| Packing | Bulk pack |
BLF989 RF Specifications
The following production-test values are specified at 700MHz using a DVB-T 8k OFDM signal in Class-AB operation:
| Parameter | Minimum | Typical | Unit |
| Drain Voltage | — | 50 | V |
| Quiescent Drain Current | — | 650 per section | mA |
| Average Output Power | 135 | — | W |
| Power Gain | 21.5 | 22.5 | dB |
| Drain Efficiency | 32 | 35 | % |
| Adjacent Channel Power Ratio | — | −30 | dBc |
| Peak-to-Average Ratio | — | 8 | dB |
| Thermal Resistance, Junction to Case | — | 0.13 | K/W |
| Drain-Source Breakdown Voltage | 108 | — | V |
Typical Applications
The BLF989 is suitable for:
DVB-T and DVB-T2 television transmitters
UHF analogue television transmitters
Broadband Class-AB broadcast amplifiers
High-efficiency Doherty transmitters
UHF transmitter driver and final stages
Industrial RF power generators
Scientific RF equipment
Medical RF systems
Broadcast transmitter upgrades
BLF878 replacement projects
Ampleon identifies UHF digital and analogue broadcasting, together with industrial, scientific and medical equipment, as the main application areas. The manufacturer also identifies the BLF989 as the replacement for the discontinued BLF878.
BLF989 and BLF989S Package Options
The BLF989 datasheet also covers the related BLF989S package version:
| Type Number | Package | Description |
| BLF989 | SOT539A | Flanged ceramic package with two mounting holes |
| BLF989S | SOT539B | Earless flanged ceramic package |
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FAQ
What is the frequency range of the BLF989?
The BLF989 operates from 400MHz to 860MHz, covering UHF digital and analogue television broadcast applications.
What is the output power of the BLF989?
The device has a nominal output power of 900W at 1dB gain compression. In the specified DVB-T production test at 700MHz, it provides at least 135W average output power.
Is the BLF989 suitable for Doherty amplifiers?
Yes. The BLF989 is specifically designed for broadband and Doherty operation. Ampleon provides application data for single-device and two-transistor Doherty amplifier configurations.
What is the typical gain of the BLF989?
At 700MHz with a DVB-T signal, the typical power gain is 22.5dB, with a specified minimum of 21.5dB.
Is the BLF989 a replacement for the BLF878?
Ampleon officially identifies the BLF989 as the replacement for the discontinued BLF878. Engineers should still verify the bias, matching circuit, package, cooling and transmitter performance before substitution.
What is the orderable part number?
The active orderable part number is BLF989U, supplied in the SOT539A flanged ceramic package.
