Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

NXP Semiconductors BF904AWR,115

Name: BF904AWR,115
Brand: NXP Semiconductors
SKU: BF904AWR,115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BF904AWR,115

Manufacturer:: NXP Semiconductors

Category:: Single FETs, MOSFETs

Package:: SC-82A, SOT-343

Datasheet:: BF904AWR,115.pdf

Description:: RF MOSFET 5V CMPAK-4

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,107

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BF904AWR from NXP Semiconductors (formerly Philips) is an N-channel dual-gate MOSFET designed for low-noise, high-gain RF amplification in VHF/UHF tuner front-ends. It delivers 25 mS forward transfer admittance, 2.2 pF gate-1 input capacitance, and 2 dB noise figure at 800 MHz, operating at 5 V supply with 30 mA max drain current and 200 mW power dissipation.

For engineers reviewing the BF904AWR datasheet, BF904AWR pinout, BF904AWR application, or BF904AWR equivalent, this device is selected for AGC-stable RF gain control in broadcast tuners, professional comms receivers, and narrowband VHF/UHF signal chains where cross-modulation suppression and low-noise performance up to 1 GHz are critical.

Technical Context

The BF904AWR uses enhancement-mode dual-gate architecture with internally interconnected source and substrate, enabling independent biasing of gate 1 (AGC control) and gate 2 (RF input). Its short-channel design optimizes y_fs/C_ig1-s ratio for wideband gain stability under varying AGC voltage.

It features built-in bias circuitry ensuring consistent cross-modulation performance during automatic gain control, with gate-1 threshold voltage between 0.3 V and 1.0 V and gate-2 breakdown voltage rated at 6–15 V - supporting robust operation in 3–7 V supply systems typical of TV tuner modules.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	7 V maximum - defines safe drain-source voltage swing in 5 V supply designs, limiting headroom for RF envelope peaks.
\|y_fs\|	25 mS typical - determines small-signal transconductance and achievable gain per stage in RF amplifier layouts.
C_ig1-s	2.2 pF typical - sets input impedance and matching network complexity at gate 1, critical for AGC loop bandwidth.
F	2 dB at 800 MHz - quantifies minimum added noise in UHF receiver LNA stages, directly impacting system sensitivity.
P_tot	200 mW at T_s ≤ 110 °C - constrains thermal design in compact SMT tuner modules; requires controlled solder-point temperature.
V_G1-S(th)	0.3–1.0 V - enables low-voltage AGC control down to near-zero volts, supporting analog gain reduction without cutoff.
T_j	150 °C maximum - defines junction temperature limit for reliability in sealed tuner enclosures with limited airflow.

Pinout & Package

SOT343R plastic surface-mount package (4-lead, reverse pinning), measuring 2.2 × 1.8 × 0.9 mm, optimized for high-frequency layout with minimized lead inductance and controlled parasitic capacitance.

Pin/Terminal	Circuit Role	Design Meaning
1	Drain	Main RF output node; connects to tuned load or next-stage input; requires impedance-matched trace routing.
2	Source	Common reference for both gates and drain; must be low-inductance RF ground for stable bias and noise performance.
4	Gate 2	RF input terminal; biased at ~4 V for optimal gain/noise trade-off; isolated from AGC path to prevent feedthrough.
3	Gate 1	AGC control terminal; voltage-variable gain adjustment port; sensitive to leakage (<50 nA cutoff current).

Key Features

Feature	Design Value
Dual-gate AGC architecture	Enables >40 dB gain reduction range (Fig.6) while maintaining <−110 dBV cross-modulation distortion (Fig.7) at 50 MHz.
Low-noise UHF operation	2 dB noise figure at 800 MHz supports high-sensitivity reception in digital terrestrial TV (DTT) and PMR receivers.
High y_fs/C_ig1-s ratio	~11.4 mS/pF typical - improves gain-bandwidth product and reduces matching component count in 50 Ω systems.
5 V supply optimization	Specified performance (gain, noise, linearity) validated at V_DS = 5 V, V_G2-S = 4 V, I_D = 10 mA - matches standard tuner rail voltages.
SOT343R RF-optimized package	Reverse pinning (2-1-4-3 top view) minimizes bond wire asymmetry; 0.25 mm pitch aids dense tuner module layout.

Applications

Television Tuner Front-End	Professional UHF Receiver
Use Scenario: First-stage RF amplifier in analog/digital terrestrial TV tuners (47–862 MHz), handling weak off-air signals with variable channel spacing. IC Role / Device Role / Timing Role: Dual-gate MOSFET providing AGC-controlled low-noise amplification; gate 2 receives antenna signal, gate 1 accepts DC AGC voltage. Use Value: Maintains constant output level across 60 dB input dynamic range while holding cross-modulation below −110 dBV (Fig.7), preventing adjacent-channel interference.	Use Scenario: IF or RF preamplifier in portable UHF land-mobile radios (400–520 MHz), operating from battery-powered 5 V rails with thermal constraints. IC Role / Device Role / Timing Role: Low-noise gain block with integrated AGC interface; enables automatic signal-level adaptation without external attenuators or switches. Use Value: Delivers 25 mS transconductance and 2 dB NF at 450 MHz, extending usable range by ≥3 dB over single-gate alternatives in field-deployed equipment.
VHF Broadcast Monitoring	Lab-Grade Signal Generator Output Stage
Use Scenario: Wideband VHF amplifier (30–300 MHz) in spectrum monitoring receivers requiring flat gain and minimal intermodulation. IC Role / Device Role / Timing Role: Fixed-gain RF amplifier with gate 2 biased for linearity; gate 1 grounded or decoupled for stable operation. Use Value: Achieves <−35 dBc two-tone IMD3 at +10 dBm output (inferred from Crss = 35 fF and yfs linearity data), supporting accurate signal analysis.	Use Scenario: Final gain stage in benchtop RF signal generators (100–1000 MHz), driving 50 Ω loads with calibrated output power. IC Role / Device Role / Timing Role: Buffered RF amplifier with precise gain control via gate 1; used in closed-loop amplitude regulation circuits. Use Value: Enables 0.1 dB gain resolution over 30 dB range using analog AGC voltage (Fig.6), improving output level accuracy and repeatability.

Television Tuner Front-End

Professional UHF Receiver

Use Scenario: First-stage RF amplifier in analog/digital terrestrial TV tuners (47–862 MHz), handling weak off-air signals with variable channel spacing.

IC Role / Device Role / Timing Role: Dual-gate MOSFET providing AGC-controlled low-noise amplification; gate 2 receives antenna signal, gate 1 accepts DC AGC voltage.

Use Value: Maintains constant output level across 60 dB input dynamic range while holding cross-modulation below −110 dBV (Fig.7), preventing adjacent-channel interference.

Use Scenario: IF or RF preamplifier in portable UHF land-mobile radios (400–520 MHz), operating from battery-powered 5 V rails with thermal constraints.

IC Role / Device Role / Timing Role: Low-noise gain block with integrated AGC interface; enables automatic signal-level adaptation without external attenuators or switches.

Use Value: Delivers 25 mS transconductance and 2 dB NF at 450 MHz, extending usable range by ≥3 dB over single-gate alternatives in field-deployed equipment.

VHF Broadcast Monitoring

Lab-Grade Signal Generator Output Stage

Use Scenario: Wideband VHF amplifier (30–300 MHz) in spectrum monitoring receivers requiring flat gain and minimal intermodulation.

IC Role / Device Role / Timing Role: Fixed-gain RF amplifier with gate 2 biased for linearity; gate 1 grounded or decoupled for stable operation.

Use Value: Achieves <−35 dBc two-tone IMD3 at +10 dBm output (inferred from Crss = 35 fF and yfs linearity data), supporting accurate signal analysis.

Use Scenario: Final gain stage in benchtop RF signal generators (100–1000 MHz), driving 50 Ω loads with calibrated output power.

IC Role / Device Role / Timing Role: Buffered RF amplifier with precise gain control via gate 1; used in closed-loop amplitude regulation circuits.

Use Value: Enables 0.1 dB gain resolution over 30 dB range using analog AGC voltage (Fig.6), improving output level accuracy and repeatability.

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
BF998,115	Higher \|y_fs\| (35 mS typ), lower C_ig1-s (1.7 pF), SOT343B package (standard pinning)	Better gain-bandwidth in 700–1200 MHz bands; less suited for legacy tuner designs using reverse-pin SOT343R footprints	Select BF998,115 when upgrading for higher UHF gain or redesigning PCB layout to accommodate standard pinout.
NE3210M04	Single-gate GaAs FET; 0.6 dB NF at 900 MHz; 5 V operation; SOT343 package	Lacks dual-gate AGC capability; requires external VGA or PIN diode attenuator for gain control	Choose NE3210M04 only when absolute lowest noise is prioritized over integrated AGC, and system-level gain control is already implemented externally.

Compared with BF904AWR, BF998,115 offers higher gain and wider bandwidth but requires PCB layout revision due to pinout change, while NE3210M04 achieves lower noise but eliminates on-chip AGC functionality - making BF904AWR uniquely balanced for cost-sensitive, AGC-integrated VHF/UHF tuner designs.

Availability

BF904AWR is available at Aetrix Electronics and suitable for television tuner modules, professional UHF communications equipment, and VHF broadcast monitoring systems requiring stable component supply and long-term obsolescence management.

Supply support for BF904AWR 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, headquartered in Eindhoven, Netherlands, develops high-performance analog and RF semiconductors for consumer, automotive, and industrial markets, with heritage from Philips Semiconductor.

The BF904AWR belongs to NXP's legacy RF transistor family targeting broadcast and communications front-ends, engineered specifically for AGC-stable, low-noise amplification in 3–7 V VHF/UHF tuner applications.

FAQ

What is the maximum operating frequency of the BF904AWR?

The BF904AWR maintains usable gain and low noise up to 1 GHz, with verified S-parameter data through 3 GHz and noise figure specified at 800 MHz. Its forward transfer admittance remains above 1.3 mS at 2 GHz (Fig.19), confirming RF capability beyond UHF band edges - though optimal amplifier design targets 50–900 MHz per datasheet characterization.

Can the BF904AWR operate from a 3.3 V supply?

The BF904AWR is characterized and optimized for 5 V operation (V_DS = 5 V, V_G2-S = 4 V), but functional operation is possible at 3.3 V with reduced gain and higher noise figure. Drain current drops to ~5 mA at V_DS = 3.3 V (Fig.14), lowering |y_fs| and degrading NF beyond datasheet specs - not recommended for production without re-characterization.

What is the pin configuration of the BF904AWR SOT343R package?

The BF904AWR uses SOT343R with reverse pinning: Pin 1 = Drain, Pin 2 = Source, Pin 4 = Gate 2, Pin 3 = Gate 1 (top view, reading left-to-right across the package body). This differs from standard SOT343 (SOT343B) and must be verified against MSB842 mechanical drawing to avoid PCB layout errors.

How does the BF904AWR achieve superior cross-modulation performance during AGC?

The BF904AWR integrates an internal bias circuit that stabilizes gate-2 operating point as gate-1 voltage varies, preventing gain-induced distortion. At 50 MHz, it achieves <−110 dBV unwanted voltage with 40 dB gain reduction (Fig.7), outperforming single-gate MOSFETs by >20 dB in multi-channel interference scenarios common in broadcast environments.

Is the BF904AWR RoHS compliant?

The BF904AWR was released in 1999, predating RoHS legislation (2006). While NXP confirms legacy compliance with lead-free soldering profiles for SOT343R packages, formal RoHS certification documentation is not available. For new designs, verify current status via NXP's product change notifications or contact Aetrix for traceable lot-level compliance data.

BF904AWR,115 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: SC-82A, SOT-343

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: MOSFET (Metal Oxide)

Configuration:: N-Channel Dual Gate

Frequency:: 200MHz

Gain:: -

Voltage - Test:: 5 V

Current Rating (Amps):: 30mA

Noise Figure:: 1dB

Current - Test:: 10 mA

Power - Output:: -

Voltage - Rated:: 7 V

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: CMPAK-4

BF904AWR,115 FAQ

1.How can I place an order for BF904AWR,115 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF904AWR,115 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 BF904AWR,115 reliable?

The price and inventory of BF904AWR,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF904AWR,115 is usually 5 days.

3.What payment methods are accepted for BF904AWR,115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF904AWR,115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF904AWR,115?

BF904AWR,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF904AWR,115 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 BF904AWR,115?

For technical support, including BF904AWR,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF904AWR,115 requirements.

6.How does Aetrix verify that BF904AWR,115 is sourced from the original manufacturer or authorized distributors?

All BF904AWR,115 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 BF904AWR,115 meets industry standards.

7.What is the process for return or replacement of BF904AWR,115?

All BF904AWR,115 units undergo pre-shipment inspection (PSI). If there is an issue with BF904AWR,115, 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 BF904AWR,115 part is unused and in its original packaging.

Return procedure for BF904AWR,115:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…