Transistor BFR91 NPN, 5GHz TO-50

Transistor BFR91 NPN, 5GHz TO-50

Transistors

Reference: TRBFR91

Part.No: BFR91

€1.40

In Stock

Immediate Dispatch

The BFR91 is a high-frequency NPN Bipolar Junction Transistor (BJT) in a TO-50 package, optimized for microwave and UHF applications. With a transition frequency exceeding 5 GHz, it is ideal for low-noise amplifiers (LNAs) in satellite reception, UHF receivers and broadband RF circuits.

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Description
Product Details

BFR91 Microwave NPN Transistor – Ultra-High Frequency RF Amplification

The BFR91 is a specialized NPN transistor engineered for microwave and UHF frequencies beyond 5 GHz. Its low-inductance TO-50 package minimizes parasitic effects, making it the preferred choice for satellite LNAs, broadband RF amplifiers and telemetry receivers where noise figure and gain at microwave frequencies are critical.

Functions & Applications

Ultra-High Frequency Operation: Transition frequency (ft) exceeding 5 GHz enables reliable amplification at microwave bands.
Low-Noise Design: Optimized for LNA applications; ideal for satellite receivers and sensitive RF circuits.
Minimal Parasitic Inductance: TO-50 flat package with minimal lead length reduces impedance mismatch and reflections.
Proven Reliability: Industry-standard for broadband and microwave RF amplification since the 1990s.

Technical Specifications

Parameter	Value / Specification
Transistor Type	BJT (Bipolar Junction Transistor)
Polarity / Channel	NPN
Package / Case	TO-50
Transition Frequency (ft)	>5 GHz
Mounting Type	Surface Mount (SMD) / Microstrip-Soldered
Application	Microwave LNA, UHF Receiver, Satellite Reception

Frequently Asked Questions

Q: Is the BFR91 suitable for direct microstrip mounting?
A: Yes, the TO-50 flat package is specifically designed for low-inductance microstrip and stripline circuit mounting. Leads are typically soldered directly onto copper traces to minimize parasitic effects.

Q: What is the typical noise figure of the BFR91 at UHF frequencies?
A: Noise figure is typically in the range of 1.5–2.5 dB at 800 MHz–2 GHz depending on bias point and impedance matching. Consult the datasheet for your specific frequency of interest.

Notes

Specialized microwave RF transistor; requires careful PCB layout and impedance matching for optimal performance. Not suitable for general-purpose low-frequency switching.

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

Transistor Type: BJT (Bipolar Junction Transistor)
Transistor Polarity / Channel: NPN
Transistor Case Style: TO-50

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