Dual-Gate MOSFET BF981 N-Channel SOT-103

Dual-Gate MOSFET BF981 N-Channel SOT-103

Transistors

Reference: TRBF981

Part.No: BF981

€1.40

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The BF981 is a high-performance N-Channel Dual-Gate MOSFET in a SOT-103 package, specifically engineered for ultra-low-noise preamplification in VHF and FM receiver applications. Its exceptional noise figure and dual-gate isolation make it the preferred choice for LNA (Low Noise Amplifier) designs where signal integrity is critical.

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Description
Product Details

BF981 Dual-Gate MOSFET – Ultra-Low Noise for VHF/FM Receiver Preamps

The BF981 is a specialized N-Channel Dual-Gate MOSFET renowned for its ultra-low noise characteristics in weak-signal reception. With a typical noise figure of 0.7dB at 200MHz, it excels in VHF and FM LNA applications where minimizing system noise floor is paramount. The dual-gate design provides exceptional input-output isolation, preventing self-oscillation and enabling clean, distortion-free amplification of faint signals.

Functions & Applications

Ultra-Low Noise Figure: Typical 0.7dB at 200MHz, ideal for weak-signal reception and VHF/FM preamplifiers.
Dual-Gate Architecture: Independent input and output gates provide excellent isolation, eliminating self-oscillation risk.
High Gain: Delivers substantial voltage amplification for extracting faint signals from antennas.
Pin-Compatible with BF961: Drop-in upgrade with superior noise performance for existing LNA designs.

Technical Specifications

Parameter	Value / Specification
Transistor Type	MOSFET (Metal–oxide–semiconductor FET)
Polarity / Channel	N-Channel
Package / Case	SOT-103
Noise Figure (NF)	0.7dB @ 200MHz
Forward Transfer Admittance (Yfs)	~25mS
Mounting Type	Surface Mount (SMD)

Frequently Asked Questions

Q: Can I use the BF981 as a drop-in replacement for the BF961?
A: Yes, the BF981 is pin-to-pin compatible with the BF961. The BF981 offers superior noise figure (typically 0.7dB vs. higher in BF961), making it an excellent upgrade for existing LNA designs.

Q: What is the typical application frequency range for the BF981?
A: The BF981 excels in the VHF band (30–300MHz), particularly around 144MHz amateur radio and 200MHz FM applications. It can be used at higher frequencies but with degraded performance.

Notes

The BF981 is a specialized low-noise MOSFET designed for professional receiver front-end and amateur radio LNA applications. It requires careful PCB layout and impedance matching to achieve its specified noise figure. Not recommended for general-purpose switching applications.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: MOSFET (Metal–oxide–semiconductor FET)
Transistor Polarity / Channel: N-Channel
Transistor Case Style: SOT-103

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