UHF power LDMOS transistor
A 900 W LDMOS RF power transistor for broadcast Doherty, class-AB transmitter and industrial applications. The excellent ruggedness of this device makes it ideal for digital and analog transmitter applications in the frequency range from 400 MHz to 860 MHz.
Features and benefits
- Designed for broadband and Doherty operation
- High efficiency
- Integrated dual sided ESD protection
- Excellent ruggedness
- High power gain
- Excellent reliability
- Easy power control
- Excellent stability
- For RoHS compliance see the product details on the Ampleon website
Applications
- Broadcast transmitter applications in the UHF band
- Digital and analog broadcasting
- Industrial, scientific and medical applications
- Applicable at frequencies from 400 MHz to 860 MHz
Parametrics
| Symbol | Parameter | Conditions | Min | Typ/Nom | Max | Unit |
|---|---|---|---|---|---|---|
| frange | frequency range | 400 | 860 | MHz | ||
| PL(1dB) | nominal output power at 1 dB gain compression | 900 | W | |||
| Test signal: DVB-T (8k OFDM), class-AB operation | ||||||
| VDS | drain-source voltage | [0] | 50 | V | ||
| IDq | quiescent drain current | per section [0] | 650 | mA | ||
| PL(AV) | average output power | f = 700 MHz [0] | 135 | W | ||
| Gp | power gain | f = 700 MHz [0] | 21.5 | 22.5 | dB | |
| ηD | drain efficiency | f = 700 MHz [0] | 32 | 35 | % | |
| ACPR | adjacent channel power ratio | f = 700 MHz [0] | -30 | -27 | dBc | |
| PAR | peak-to-average ratio | f = 700 MHz [0] | 8 | dB | ||
Package / Packing
| Type number | Package | Outline version | Packing | Product status | Marking |
Orderable part number, (Ordering code (12NC)) |
|---|---|---|---|---|---|---|
| BLF989 | ACC-1230 (SOT539A) |
sot539a_po | Bulk Pack | Active | Standard Marking |
BLF989U (9349 601 46112) |
Pinning info
| Pin | Symbol | Description | Simplified outline | Graphic symbol |
|---|---|---|---|---|
| 1 | D1 | drain1 |
|
|
| 2 | D2 | drain2 | ||
| 3 | G1 | gate1 | ||
| 4 | G2 | gate2 | ||
| 5 | S | source [1] |
Ordering & availability
| Type number | Ordering code (12NC) | Orderable part number | Distributor | Buy online | Samples |
|---|---|---|---|---|---|
| BLF989 | 9349 601 46112 | BLF989U | Mouser | Buy | Request samples |
| DigiKey | Buy | ||||
| RFMW | Buy |
Documentation
| Title | Type | Date | |
|---|---|---|---|
| UHF power LDMOS transistor | Data sheet | 2019-05-24 | |
| Mounting and soldering of RF transistors in air cavity packages | Application note | 2025-02-03 | |
| Measurement results of a DVB-T digital TV transmitter design for the 470–494 MHz band with BLF989 | Report | 2019-04-19 | |
| Measurement results of a symmetrical inverted Doherty design for the 470–500 MHz band with 2x BLF989 combined | Report | 2020-09-18 | |
| Measurement results of a Class-AB broadband design for the 470–700 MHz band with BLF989 | Report | 2018-07-11 | |
| Measurement results of a Class-AB design for the 470–700 MHz band at 50 V with BLF989 | Report | 2022-04-26 | |
| Measurement results of a Class-AB broadband design for the 474–714 MHz band with BLF989 | Report | 2022-04-25 | |
| RF power solutions for ISM, broadcast, navigation and safety radio applications | Brochure | 2025-04-17 | |
| RF power application reports for ISM, broadcast, navigation and safety radio applications | Brochure | 2025-04-17 | |
| Packages for RF power transistors | Leaflet | 2024-10-25 |
Design support
| Title | Type | Date | |
|---|---|---|---|
| Printed-Circuit Board (PCB) BLF989(S) (Data sheet) | Design support | 2018-09-10 | |
| BLF989(S) Model for ADS 2019 (Keysight Advanced Design System) | Simulation model | 2023-05-22 | |
| Model Library for Cadence AWR Microwave Office® | Simulation model | 2023-01-02 | |
| Model Library Manual for Cadence AWR Microwave Office® | Simulation model | 2023-01-02 | |
| Simulation Example for Cadence AWR Microwave Office® | Simulation model | 2023-01-02 |