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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar RF Transistors

NXP Semiconductors BFR505215

Name: BFR505215
Brand: NXP Semiconductors
SKU: BFR505215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BFR505215

Manufacturer:: NXP Semiconductors

Category:: Bipolar RF Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BFR505215.pdf

Description:: SMALL SIGNAL BIPOLAR TRANSISTOR

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BFR505215 from NXP Semiconductors is an NPN silicon planar epitaxial RF transistor in SOT23 package, designed for GHz-range wideband front-end amplification in analog/digital cellular telephones, DECT cordless systems, satellite TV tuners, and radar detectors. It delivers 9 GHz transition frequency, 17 dB maximum unilateral gain at 900 MHz, and 1.6 dB typical noise figure at 900 MHz with 5 mA collector current.

For engineers reviewing the BFR505215 datasheet, BFR505215 pinout, BFR505215 application, or BFR505215 equivalent, key selection criteria include RF gain flatness across 900 MHz–2 GHz, low-noise performance under 5 mA bias, thermal resistance of 260 K/W to soldering point, and compatibility with 50 Ω impedance-matched PCB layouts for high-frequency signal integrity.

Technical Context

This discrete NPN transistor operates in common-emitter configuration with gold metallization for reliability in RF front ends. Its 9 GHz f_T, 0.3 pF feedback capacitance, and 14 dB typical insertion gain at 900 MHz support stable wideband amplification without external neutralization.

Designed for fixed-bias or emitter-degenerated topologies, it maintains 10 dB G_UM at 2 GHz and achieves 4 dBm output power at 1 dB compression under 5 mA/6 V conditions - enabling compact, low-power RF amplifier stages in portable wireless receivers.

Key Specifications

Parameter	Value and Actual Design Meaning
f_T	9 GHz - enables amplification up to UHF and low microwave bands without gain roll-off
G_UM @ 900 MHz	17 dB typical - provides sufficient gain margin for cascaded LNA stages in SATV tuners
Noise Figure @ 900 MHz	1.6 dB typical at 5 mA - ensures minimal degradation of receiver sensitivity in cellular front ends
V_CEO	15 V - supports operation with standard 5 V or 12 V supply rails using resistive bias networks
P_tot	150 mW - limits thermal rise in SOT23 footprint; requires trace thermal relief for continuous RF duty
R_th(j-s)	260 K/W - defines junction-to-solder-point thermal path; mandates direct collector tab soldering for power handling
C_re	0.3 pF - low feedback capacitance reduces risk of oscillation in broadband amplifier designs

Pinout & Package

The BFR505215 is housed in a plastic SOT23 (TO-236AB) surface-mount package measuring 2.9 mm × 1.3 mm × 1.0 mm with gull-wing leads. The collector tab forms the thermal and electrical connection point at Pin 3.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	RF input node; requires DC blocking and impedance matching network for optimal noise performance
2	Emiter	AC ground reference; must be low-inductance connected to RF ground plane for stability
3	Collector	RF output and primary thermal path; soldered directly to copper pour for heat dissipation

Key Features

Feature	Design Value
Gold metallization	Ensures long-term bond-wire reliability under thermal cycling in portable RF modules
Low C_re (0.3 pF)	Minimizes internal feedback, allowing stable >1 GHz operation without neutralization capacitors
High f_T (9 GHz)	Supports wideband gain extension into 2 GHz band for dual-mode (GSM/UMTS) front ends
1.6 dB NF @ 900 MHz	Meets sensitivity requirements for DECT and cellular receiver LNAs with minimal external components
SOT23 thermal design	Collector-tab construction enables 150 mW dissipation when mounted on ≥10 mm² copper area

Applications

Cellular Telephone RF Front End	Satellite TV Tuner LNA
Use Scenario: Low-noise amplification of 800–960 MHz GSM receive signals prior to downconversion. IC Role / Device Role / Timing Role: First-stage LNA in heterodyne receiver architecture with fixed 5 mA bias. Use Value: 1.6 dB noise figure preserves SNR while 14 dB S21 gain reduces need for subsequent active stages.	Use Scenario: Amplification of 950–2150 MHz satellite IF signals in set-top box tuner modules. IC Role / Device Role / Timing Role: Wideband gain block operating from 1–2 GHz with minimal group delay variation. Use Value: 10 dB G_UM at 2 GHz and 0.3 pF C_re enable stable broadband response without tuning traps.
DECT Cordless Base Station	Radar Detector RF Amplifier
Use Scenario: 1880–1900 MHz receive-path amplification in European DECT base stations. IC Role / Device Role / Timing Role: High-linearity LNA biased at 5 mA to maintain OIP3 > 10 dBm. Use Value: 4 dBm P1dB output and 10 dBm IIP3 support multi-channel interference rejection in dense RF environments.	Use Scenario: X-band (10.5 GHz) local oscillator buffer and pre-amplifier stage in consumer radar detectors. IC Role / Device Role / Timing Role: Gain block following VCO; leverages 9 GHz f_T for harmonic suppression. Use Value: 9 GHz f_T and 0.4 pF emitter capacitance reduce second-harmonic feedthrough into mixer inputs.

Cellular Telephone RF Front End

Satellite TV Tuner LNA

Use Scenario: Low-noise amplification of 800–960 MHz GSM receive signals prior to downconversion.

IC Role / Device Role / Timing Role: First-stage LNA in heterodyne receiver architecture with fixed 5 mA bias.

Use Value: 1.6 dB noise figure preserves SNR while 14 dB S21 gain reduces need for subsequent active stages.

Use Scenario: Amplification of 950–2150 MHz satellite IF signals in set-top box tuner modules.

IC Role / Device Role / Timing Role: Wideband gain block operating from 1–2 GHz with minimal group delay variation.

Use Value: 10 dB G_UM at 2 GHz and 0.3 pF C_re enable stable broadband response without tuning traps.

DECT Cordless Base Station

Radar Detector RF Amplifier

Use Scenario: 1880–1900 MHz receive-path amplification in European DECT base stations.

IC Role / Device Role / Timing Role: High-linearity LNA biased at 5 mA to maintain OIP3 > 10 dBm.

Use Value: 4 dBm P1dB output and 10 dBm IIP3 support multi-channel interference rejection in dense RF environments.

Use Scenario: X-band (10.5 GHz) local oscillator buffer and pre-amplifier stage in consumer radar detectors.

IC Role / Device Role / Timing Role: Gain block following VCO; leverages 9 GHz f_T for harmonic suppression.

Use Value: 9 GHz f_T and 0.4 pF emitter capacitance reduce second-harmonic feedthrough into mixer inputs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BFP180	Higher f_T (10 GHz), lower NF (1.1 dB typ), but 100 mW P_tot and SOT323 package	Better noise performance at 2 GHz; limited power handling restricts use in saturated-output stages	Select BFP180 when sub-1.2 dB NF is required at 2 GHz and thermal budget allows smaller footprint
MRF581	Lower f_T (5 GHz), higher P_tot (250 mW), TO-92 through-hole package	Higher power capability suits fixed-station radar detectors; lacks SMT compatibility and GHz bandwidth	Choose MRF581 only for legacy through-hole designs requiring >200 mW dissipation below 1 GHz

Compared with BFR505215, BFP180 offers superior noise and frequency performance in a smaller package but reduced thermal capacity, while MRF581 trades bandwidth and mounting flexibility for higher power - making BFR505215 the balanced choice for SMT-based 900 MHz–2 GHz portable RF front ends.

Availability

BFR505215 is available at Aetrix Electronics and suitable for cellular telephone RF front ends, satellite TV tuner LNAs, DECT base stations, and radar detector amplifiers requiring stable component supply across high-volume production cycles.

Supply support for BFR505215 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communication markets.

The BFR505215 belongs to NXP's RF transistor product line, engineered specifically for GHz-range wideband amplification in portable wireless receivers where low noise, high gain, and SMT manufacturability are critical.

FAQ

What is the maximum operating frequency supported by the BFR505215?

The BFR505215 has a transition frequency (f_T) of 9 GHz, verified under 5 mA collector current and 6 V collector-emitter voltage. This specification confirms usable gain up to approximately 2–3 GHz in practical amplifier designs, with measured S21 insertion gain of 14 dB at 900 MHz and 10 dB at 2 GHz - making BFR505215 suitable for UHF and low-L-band applications but not for true microwave (>3 GHz) operation.

Does the BFR505215 require external neutralization for stability?

No, the BFR505215 does not require external neutralization due to its low 0.3 pF feedback capacitance (C_re) and optimized internal layout. Stability analysis in the datasheet shows unconditional stability up to 2 GHz under standard 50 Ω source/load conditions, confirmed by measured S-parameters and noise circle plots - enabling robust single-transistor amplifier designs without added neutralizing components.

What is the recommended bias condition for minimum noise figure in the BFR505215?

The BFR505215 achieves its minimum noise figure of 1.2 dB at 900 MHz with 1.25 mA collector current and 6 V collector-emitter voltage under Γ_s = Γ_opt. However, the typical application bias of 5 mA/6 V yields 1.6 dB NF - a practical trade-off that improves gain and output power while maintaining competitive noise performance for most receiver front ends.

Can the BFR505215 be used in Class A amplifier configurations?

Yes, the BFR505215 is routinely deployed in Class A small-signal amplifier configurations. Its 15 V V_CEO, 18 mA maximum DC collector current, and 150 mW total power dissipation support linear operation with collector currents between 1.25 mA and 5 mA - delivering consistent gain and noise performance without distortion-induced intermodulation in receive-path stages.

How is thermal management handled for the BFR505215 in high-duty-cycle applications?

Thermal management for the BFR505215 relies on direct conduction from the collector tab (Pin 3) to PCB copper. With a junction-to-solder-point thermal resistance of 260 K/W, sustained 150 mW operation requires ≥10 mm² of 1-oz copper connected to Pin 3 via multiple thermal vias - validated in NXP's power derating curve, which shows full-rated power only up to 135 °C solder-point temperature.

BFR505215 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Voltage - Collector Emitter Breakdown (Max):: 15V

Frequency - Transition:: 9GHz

Noise Figure (dB Typ @ f):: 1.2dB ~ 2.1dB @ 900MHz

Gain:: -

Power - Max:: 150mW

DC Current Gain (hFE) (Min) @ Ic, Vce:: 60 @ 5mA, 6V

Current - Collector (Ic) (Max):: 18mA

Operating Temperature:: 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23 (TO-236AB)

BFR505215 FAQ

1.How can I place an order for BFR505215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BFR505215 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BFR505215 reliable?

The price and inventory of BFR505215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BFR505215 is usually 5 days.

3.What payment methods are accepted for BFR505215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BFR505215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BFR505215?

BFR505215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BFR505215 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BFR505215?

For technical support, including BFR505215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BFR505215 requirements.

6.How does Aetrix verify that BFR505215 is sourced from the original manufacturer or authorized distributors?

All BFR505215 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BFR505215 meets industry standards.

7.What is the process for return or replacement of BFR505215?

All BFR505215 units undergo pre-shipment inspection (PSI). If there is an issue with BFR505215, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BFR505215 part is unused and in its original packaging.

Return procedure for BFR505215:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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