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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > Single FETs, MOSFETs

NXP Semiconductors BF909AR,215

Name: BF909AR,215
Brand: NXP Semiconductors
SKU: BF909AR,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF909AR,215

Manufacturer:: NXP Semiconductors

Category:: Single FETs, MOSFETs

Package:: SOT-143R

Datasheet:: BF909AR,215.pdf

Description:: RF MOSFET SOT143R

Quantity:: RFQ Add To RFQ list

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Inventory:7,693

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Product details

Overview

BF909AR,215 from NXP Semiconductors is an N-channel dual-gate MOSFET designed for VHF/UHF low-noise amplification at 5 V supply, featuring 43 mS typical forward transfer admittance, 4.3 pF input capacitance at gate 1, and 2.0 dB minimum noise figure at 800 MHz - deployed in television tuners and professional RF front-ends.

For engineers reviewing the BF909AR,215 datasheet, BF909AR,215 pinout, BF909AR,215 application, or BF909AR,215 equivalent, this page delivers verified package mapping (SOT143R), validated dual-gate biasing behavior, cross-modulation performance data at 50–1000 MHz, and direct alternatives with documented thermal and noise trade-offs.

Technical Context

This device implements a monolithic enhancement-mode dual-gate structure with internally connected source and substrate to optimize AGC linearity. Gate 1 serves as RF input with 3.6–4.3 pF capacitance; Gate 2 acts as DC/AGC-controlled gain control node with 2.3–3.0 pF input capacitance and 0.3–1.2 V threshold voltage.

It operates under fixed 5 V drain-source bias with 15 mA nominal drain current, delivering stable 36–50 mS forward transfer admittance up to 1 GHz while maintaining ≤2.8 dB noise figure. Its 35–50 fF reverse transfer capacitance minimizes feedback-induced instability in tuned amplifier stages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	7 V maximum - sets safe operating voltage ceiling for 5 V supply designs with transient margin
\|y_fs\|	43 mS typical - enables high small-signal gain in single-stage VHF amplifiers without neutralization
C_ig1-s	4.3 pF maximum - defines input matching network component values at UHF frequencies
F	2.0 dB minimum at 800 MHz - ensures low degradation of SNR in sensitive tuner IF/RF stages
P_tot	200 mW maximum - requires thermal derating above 40 °C ambient for BF909AR,215 (SOT143R)
V_G2-S(th)	1.2 V maximum - determines minimum AGC control voltage needed to maintain conduction
C_rs	50 fF maximum - limits Miller-effect phase shift and oscillator risk in broadband amplifier layouts

Pinout & Package

The BF909AR,215 is housed in a plastic SOT143R microminiature surface-mount package (3.0 × 1.4 × 0.95 mm), optimized for RF layout density and thermal dissipation via source lead soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	s, b (source & bulk)	Common reference node for both gates; must be DC-grounded and RF-bypassed for stable operation
2	d (drain)	RF output terminal; connects to tuned load or next stage; requires DC blocking and impedance matching
3	g2 (gate 2)	AGC/gain-control input; biased at 4 V typical; high-impedance node sensitive to leakage and routing parasitics
4	g1 (gate 1)	RF signal input; lowest-capacitance gate (3.6–4.3 pF); requires 50 Ω source termination for broadband match

Key Features

Feature	Design Value
Dual-gate architecture with source-bulk tie	Enables independent RF input (g1) and gain control (g2) while suppressing cross-modulation distortion during AGC
43 mS \|y_fs\| at 15 mA I_D	Delivers >12 dB small-signal gain in 50 Ω systems up to 800 MHz without cascading stages
2.0 dB F_min at 800 MHz	Meets stringent noise requirements for terrestrial TV tuner LNA stages where signal integrity is critical
SOT143R package with 0.48 mm lead pitch	Supports compact RF PCB layouts with controlled impedance traces and minimal parasitic inductance
35–50 fF C_rs	Reduces risk of unconditional instability in common-source configurations up to 1 GHz

Applications

Television Tuner Front-End	UHF Wireless Microphone Receiver
Use Scenario: Amplifying weak terrestrial broadcast signals (470–862 MHz) before mixer conversion in analog/digital TV tuners. IC Role / Device Role / Timing Role: Low-noise RF amplifier with AGC-controlled gain staging to handle dynamic signal ranges. Use Value: 2.0 dB noise figure preserves SNR; dual-gate topology maintains <1% cross-modulation distortion under 20 dB gain reduction.	Use Scenario: Boosting microphone capsule output in portable UHF wireless audio transmitters (790–820 MHz). IC Role / Device Role / Timing Role: First-stage LNA with gate 2 biased for battery-voltage tracking gain control. Use Value: 5 V operation matches single-cell Li-ion supply rails; 200 mW power budget allows continuous duty-cycle operation.
Professional Two-Way Radio IF Stage	VHF Aircraft Band Receiver Preamp
Use Scenario: Intermediate-frequency amplification (108–174 MHz) in land-mobile radio base stations with automatic level control. IC Role / Device Role / Timing Role: Gain-stable IF amplifier where gate 2 receives analog AGC voltage from detector circuitry. Use Value: 43 mS \|y_fs\| provides 15 dB mid-band gain; 150 °C junction rating supports industrial temperature cycling.	Use Scenario: Signal conditioning of 118–137 MHz aircraft communications band signals in avionics-grade receivers. IC Role / Device Role / Timing Role: High-linearity RF preamplifier with source grounded to chassis for EMI suppression. Use Value: 6–15 V gate breakdown rating ensures robustness against static discharge in airborne environments.

Television Tuner Front-End

UHF Wireless Microphone Receiver

Use Scenario: Amplifying weak terrestrial broadcast signals (470–862 MHz) before mixer conversion in analog/digital TV tuners.

IC Role / Device Role / Timing Role: Low-noise RF amplifier with AGC-controlled gain staging to handle dynamic signal ranges.

Use Value: 2.0 dB noise figure preserves SNR; dual-gate topology maintains <1% cross-modulation distortion under 20 dB gain reduction.

Use Scenario: Boosting microphone capsule output in portable UHF wireless audio transmitters (790–820 MHz).

IC Role / Device Role / Timing Role: First-stage LNA with gate 2 biased for battery-voltage tracking gain control.

Use Value: 5 V operation matches single-cell Li-ion supply rails; 200 mW power budget allows continuous duty-cycle operation.

Professional Two-Way Radio IF Stage

VHF Aircraft Band Receiver Preamp

Use Scenario: Intermediate-frequency amplification (108–174 MHz) in land-mobile radio base stations with automatic level control.

IC Role / Device Role / Timing Role: Gain-stable IF amplifier where gate 2 receives analog AGC voltage from detector circuitry.

Use Value: 43 mS |y_fs| provides 15 dB mid-band gain; 150 °C junction rating supports industrial temperature cycling.

Use Scenario: Signal conditioning of 118–137 MHz aircraft communications band signals in avionics-grade receivers.

IC Role / Device Role / Timing Role: High-linearity RF preamplifier with source grounded to chassis for EMI suppression.

Use Value: 6–15 V gate breakdown rating ensures robustness against static discharge in airborne environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-gate MOSFET amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BF998,215	Higher \|y_fsig1-s (2.7 pF), same SOT143R package	Better gain-bandwidth product but tighter layout sensitivity due to lower input capacitance	Select when >14 dB gain at 900 MHz is required and board-level shielding is feasible
MRF9011LT1G	Single-gate LDMOS, 500 MHz f_T, 10 W P_1dB, SO-8 package	Higher power handling but no AGC capability; requires external gain control circuitry	Select for wideband driver stages where dual-gate functionality is not essential

Compared with BF909AR,215, BF998,215 offers higher gain and bandwidth at the cost of reduced input matching tolerance, while MRF9011LT1G trades AGC integration for raw RF power - making BF909AR,215 optimal for compact, low-power, gain-stable VHF/UHF receiver front-ends.

Availability

BF909AR,215 is available at Aetrix Electronics and suitable for television tuners, professional two-way radios, UHF wireless microphones, and avionics receivers requiring stable component supply across extended production lifecycles.

Supply support for BF909AR,215 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 high-performance analog, RF, and mixed-signal solutions for automotive, industrial, and consumer markets.

The BF909AR,215 belongs to NXP's legacy RF transistor portfolio, engineered specifically for low-noise, dual-gate amplifier applications in broadcast and professional communications equipment operating below 1 GHz.

FAQ

What is the maximum drain-source voltage rating for BF909AR,215?

The BF909AR,215 has a maximum drain-source voltage (V_DS) rating of 7 V, as specified in the Absolute Maximum Ratings table. This rating applies under all operating conditions and must not be exceeded to ensure long-term reliability. The device is optimized for 5 V supply operation, providing 2 V headroom for transient spikes. Exceeding 7 V risks permanent breakdown of the channel region, especially under elevated junction temperatures.

How does BF909AR,215 differ from BF909,215 in package and thermal performance?

The BF909AR,215 uses the SOT143R package (marked %M4), whereas BF909,215 uses SOT143 (marked %M3). The SOT143R variant has a lower thermal resistance from junction to ambient (550 K/W vs. 500 K/W for BF909,215) and requires derating above 40 °C ambient - confirmed in the Limiting Values table. Both share identical pinout and electrical specs, but BF909AR,215's leadframe geometry alters thermal path efficiency.

Can BF909AR,215 be used in 3 V supply applications?

The BF909AR,215 is specifically characterized and optimized for 5 V operation, with key parameters like |y_fs|, noise figure, and cross-modulation performance validated at V_DS = 5 V and V_G2-S = 4 V. While it may conduct at 3 V, datasheet data does not guarantee performance - forward transfer admittance drops significantly below 4 V V_DS, and noise figure degrades beyond 2.8 dB. For 3 V systems, NXP's BF998 or BF1107 series are better validated alternatives.

What is the role of the interconnected source and bulk terminals in BF909AR,215?

In the BF909AR,215, pin 1 connects both source and bulk (substrate), forming a tied-body configuration. This eliminates body-effect modulation and stabilizes threshold voltage during AGC operation - directly enabling the device's superior cross-modulation performance. It mandates that the source node be solidly grounded (DC and RF) to maintain consistent channel characteristics and prevent gain nonlinearity in varying signal conditions.

Is BF909AR,215 RoHS compliant and halogen-free?

Yes, BF909AR,215 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. This is confirmed in NXP's product change notices and material declarations dated post-2006, aligning with the transition from Philips to NXP branding. The SOT143R package uses lead-free matte tin terminations and green molding compound, supporting lead-free reflow profiles up to 260 °C peak.

BF909AR,215 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: SOT-143R

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: MOSFET (Metal Oxide)

Configuration:: Dual Gate

Frequency:: 800MHz

Gain:: -

Voltage - Test:: -

Current Rating (Amps):: 40mA

Noise Figure:: 2dB

Current - Test:: -

Power - Output:: -

Voltage - Rated:: 7 V

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-143R

BF909AR,215 FAQ

1.How can I place an order for BF909AR,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF909AR,215 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 BF909AR,215 reliable?

The price and inventory of BF909AR,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF909AR,215 is usually 5 days.

3.What payment methods are accepted for BF909AR,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF909AR,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF909AR,215?

BF909AR,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF909AR,215 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 BF909AR,215?

For technical support, including BF909AR,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF909AR,215 requirements.

6.How does Aetrix verify that BF909AR,215 is sourced from the original manufacturer or authorized distributors?

All BF909AR,215 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 BF909AR,215 meets industry standards.

7.What is the process for return or replacement of BF909AR,215?

All BF909AR,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF909AR,215, 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 BF909AR,215 part is unused and in its original packaging.

Return procedure for BF909AR,215:

1.Submit a request within 90 days.

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

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