BLF278

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BLF278

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RF MOSFET 50V CDFM4

  • FabricanteRochester Electronics, LLC

  • Peça do Fabricante #BLF278

  • Em Estoque1218

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Especificações

Atributo Valor
Part Status Obsolete
Technology MOSFET (Metal Oxide)
Configuration 2 N-Channel (Dual) Common Source
Gain 18dB
Voltage - Test 50 V
Current Rating (Amps) 2.5mA
Current - Test 200 mA
Power - Output 300W
Voltage - Rated 125 V
Package SOT-262A1
Supplier Device Package CDFM4
Packaging Bulk

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Description

The BLF278 is a high-power RF transistor commonly used in radio frequency (RF) applications. It is designed for use in industrial, scientific, and medical (ISM) frequency bands, among others. This transistor belongs to the category of laterally diffused metal oxide semiconductor (LDMOS) devices, which are valued for their high efficiency, linearity, and reliability.
The BLF278 operates typically in the very high frequency (VHF) and ultra-high frequency (UHF) ranges. It is capable of delivering significant output power, making it suitable for applications like RF amplifiers in broadcast transmitters and other communication equipment.
Key features of the BLF278 include high gain, high efficiency, and a robust design that ensures durability even under challenging conditions. Its LDMOS technology allows for better thermal management and enhanced performance compared to older bipolar transistor technologies. The device's package is designed to facilitate effective heat dissipation, contributing to its reliability in high-power applications.
In summary, the BLF278 is a versatile and efficient RF transistor ideal for high-power applications across various frequency bands.

Equivalent

The BLF278 is a high-power RF transistor commonly used in RF amplification applications. Equivalent products include the MRFE6VP61K25H by NXP, the MRF151G by NXP, and the SD2933 from STMicroelectronics. These components serve similar applications in RF power amplification circuits, operating in similar frequency ranges and power levels. Always check datasheets for specific performance and compatibility requirements.

Features

The BLF278 is a high-performance RF power transistor designed for communications applications. It is specifically crafted for use in HF and VHF transmitters, covering frequencies up to 150 MHz. Key features include:
1. Power Output: The BLF278 can deliver a high power output of up to 300 watts, making it suitable for high-demand applications.

2. Efficiency: It offers a high efficiency level, which is crucial for reducing energy consumption and heat generation during operation.
3. Gain: The device provides a high power gain, typically around 18 dB, ensuring strong signal amplification.
4. Ruggedness: It is designed to withstand load mismatches, offering durability and reliability under various operating conditions.
5. Package: The transistor is housed in an industry-standard ceramic package, which provides excellent thermal conductivity and mechanical robustness.
6. Applications: It's commonly used in radio frequency applications, including broadcast transmitters and industrial heating.
These features make the BLF278 a robust choice for RF power amplification needs.

Pinout

The BLF278 is an RF power transistor commonly used in high-frequency applications. It typically comes in a package with four pins. Here's a concise description of its pin functions:
1. Pin 1 (Drain): This is the output of the transistor and is typically connected to the RF load. It handles the high voltage and current, providing the amplified RF signal.
2. Pin 2 (Source): This pin is connected to the ground or reference potential in the circuit. It serves as the return path for the current and is common to both the input and output.
3. Pin 3 (Gate): The gate is the input of the transistor where the RF signal to be amplified is applied. It controls the operation of the transistor by modulating the current flow between the drain and source.
4. Pin 4 (Source): Similar to Pin 2, this is another source connection and is also tied to ground in the circuit layout for stability and performance.
These pins are crucial for the transistor's operation in RF amplification, often integrated into systems like radio transmitters and linear amplifiers.

Manufacturer

The BLF278 is a high-frequency N-channel MOSFET transistor primarily used in radio frequency applications. The manufacturer of the BLF278 is Ampleon, a company that specializes in RF power solutions. Ampleon was originally part of NXP Semiconductors and became independent in 2015 to focus on RF power technologies. The company provides components for wireless infrastructure, broadcast, and industrial, scientific, and medical (ISM) applications. Ampleon is known for its innovation in high-performance RF power transistors, offering solutions that enhance efficiency and reliability across various industries.

Application

The BLF278 is a high-power LDMOS RF transistor primarily used in radio frequency and microwave applications. Key application areas include:
1. Broadcast Transmitters: Ideal for AM/FM and television broadcasting due to its high efficiency and linearity.
2. Industrial, Scientific, and Medical (ISM) Equipment: Used in RF heating, plasma generation, and other industrial processes.
3. Aerospace and Defense: Suitable for radar systems and communication equipment due to its robustness and reliability.
4. Wireless Communication Infrastructure: Supports cellular base stations and repeaters.
5. Amateur Radio: Popular among amateur radio enthusiasts for high-power transmitters.
Its high gain, efficiency, and thermal stability make it versatile for these high-frequency applications.

Package

The BLF278 is a high-power LDMOS RF transistor typically used in broadcast applications. It comes in a flanged ceramic package, specifically an SOT539B package type.

Frequently Asked Questions


Q: What is the typical application for the BLF278 dual MOSFET?
A: It is designed for high-power RF amplification in broadcast transmitters and industrial heating, operating up to 300W output.


Q: Does this part require a heatsink for 300W operation?
A: Yes, given its 300W power output in a CDFM4 package, adequate thermal management is critical for reliable performance.


Q: Can the BLF278 be used for 50V DC supply systems?
A: Yes, it is optimized for 50V test voltage and rated up to 125V, making it suitable for standard 50V RF amplifier designs.


Q: What is the gain of the BLF278 at 200 mA test current?
A: The typical gain is 18dB under the specified 50V test and 200mA bias conditions.


Q: What does the "Common Source" configuration mean for circuit design?
A: Both N-Channel MOSFETs share a common source pin, simplifying symmetrical push-pull amplifier topologies.


Q: Is the BLF278 still in production?
A: No, its part status is Obsolete, but it remains available through Rochester Electronics as an authorized aftermarket source.


Q: What is the current rating for continuous operation?
A: The maximum continuous current rating is 2.5mA per device, with a test condition of 200 mA for RF pulse or average power.


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