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NXP Semiconductors BF904R,215
- Part No.:
- BF904R,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Single FETs, MOSFETs
- Package:
- SOT-143R
- Datasheet:
-
BF904R,215.pdf
- Description:
- RF MOSFET 5V SOT143R
- Quantity:
- Payment:
- Shipping:
Inventory:5,726
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Product details
Overview
BF904R,215 from NXP Semiconductors is an N-channel dual-gate MOSFET in SOT143R package, designed for low-noise VHF/UHF amplifier stages operating at 3–7 V supply. It delivers 25 mS forward transfer admittance, 2.2 pF input capacitance at gate 1, and 2 dB noise figure at 800 MHz - enabling high-gain, low-distortion signal amplification in TV tuners and professional RF receivers.
For engineers reviewing the BF904R,215 datasheet, BF904R,215 pinout, BF904R,215 application, or BF904R,215 equivalent, this page provides verified pin functions, thermal derating curves, AGC-compatible cross-modulation performance, and real-world RF gain/noise trade-offs critical for tuner front-end design.
Technical Context
The BF904R,215 integrates two cascaded MOSFET gates (G1 and G2) with source and substrate internally connected, forming a single-stage amplifier optimized for automatic gain control (AGC) operation. Its short-channel structure enables high yfs/Cig1-s ratio (≈11.4 mS/pF), supporting stable gain up to 1 GHz while minimizing intermodulation distortion.
Gate 1 serves as the RF input with 0.3–1.0 V threshold voltage and sub-50 nA cutoff current; Gate 2 acts as the AGC control terminal with 4 V bias, enabling >40 dB gain reduction over 0–4 V AGC voltage range. The device operates with 5 V drain-source bias and exhibits 290 K/W junction-to-solder-point thermal resistance in SOT143R mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 7 V max - sets absolute upper limit for drain bias in tuner IF/RF stages |
| |yfs| | 25 mS typ - determines small-signal transconductance and achievable gain at 50 MHz |
| Cig1-s | 2.2 pF typ - defines input matching network complexity at VHF band |
| F | 2 dB @ 800 MHz - specifies minimum added noise in UHF receiver front-ends |
| Ptot | 200 mW max - constrains continuous power handling on PCB with 40 °C ambient limit |
| Tj | 150 °C max - defines maximum junction temperature before thermal runaway |
| Crs | 25 fF typ - limits feedback path causing instability above 1 GHz |
Pinout & Package
BF904R,215 uses the SOT143R plastic surface-mount package (3.0 × 1.4 × 1.1 mm), featuring reverse pinning versus SOT143B: Pin 1 = source/bulk, Pin 2 = drain, Pin 3 = gate 2, Pin 4 = gate 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | source and bulk | Common reference node for both gates; must be DC-grounded and RF-bypassed |
| 2 | drain | RF output node; connects to tuned load or next stage via coupling capacitor |
| 3 | gate 2 | AGC control input; biased at 4 V for optimal cross-modulation performance |
| 4 | gate 1 | RF input node; requires impedance-matched 50 Ω source for minimal noise figure |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gate architecture with internal source-bulk connection | Enables independent RF input (G1) and AGC control (G2) without external bias resistors |
| Low noise figure (2 dB @ 800 MHz) | Supports high-sensitivity UHF reception in digital TV tuners with minimal SNR degradation |
| High yfs/Cig1-s ratio (≈11.4 mS/pF) | Delivers wideband gain stability up to 1 GHz without peaking compensation |
| Superior cross-modulation suppression | Maintains <−100 dBc unwanted voltage at 30 dB gain reduction - critical for multi-channel broadcast reception |
| 5 V supply optimization | Guarantees full parameter compliance at standard logic-level supply rails, simplifying power design |
Applications
| Television Tuner Front-End | Professional VHF Receiver |
|---|---|
Use Scenario: Amplifying weak terrestrial broadcast signals (47–862 MHz) before mixer stage in analog/digital TV set-top boxes. IC Role / Device Role / Timing Role: Low-noise RF amplifier with AGC-controlled gain staging to handle dynamic signal strength variations. Use Value: Achieves 2 dB noise figure and >40 dB AGC range - preserving SNR across channel scans and multipath environments. | Use Scenario: Signal amplification in portable land-mobile radios operating in 30–300 MHz bands. IC Role / Device Role / Timing Role: First-stage preamplifier with adjustable gain to maintain linearity under strong adjacent-channel interference. Use Value: Delivers 25 mS transconductance and <35 fF reverse capacitance - enabling stable broadband gain without neutralization. |
| UHF Wireless Microphone Receiver | RF Test Equipment Preamp |
Use Scenario: Boosting microphone RF carrier (500–900 MHz) in studio-grade wireless systems with fast AGC response. IC Role / Device Role / Timing Role: Dual-gate amplifier where G2 receives analog AGC voltage to compress gain during overload events. Use Value: Maintains <−110 dBc cross-modulation distortion at 50 MHz offset - ensuring clean audio under dense RF environments. | Use Scenario: Input stage of spectrum analyzers or signal generators requiring flat gain and low added noise below 1 GHz. IC Role / Device Role / Timing Role: Precision low-noise amplifier with calibrated gain and repeatable noise performance across units. Use Value: Provides 2.2 pF input capacitance and 25 mS yfs - enabling accurate 50 Ω source termination and traceable gain calibration. |
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 |yfsig1-s (1.8 pF), 1.5 dB noise figure @ 800 MHz | Better suited for ultra-low-noise UHF front-ends requiring tighter NF spec | Select BF998,215 when NF <1.6 dB is mandatory and layout allows tighter thermal management |
| NE3512M04 | Single-gate GaAs FET, 12 dB gain @ 900 MHz, 0.8 dB NF, SOT343 package | Lacks dual-gate AGC capability; requires external bias network for gain control | Choose NE3512M04 only if AGC is implemented digitally or externally, and higher frequency (>1 GHz) operation is needed |
Compared with BF904R,215, BF998,215 offers superior noise and gain but demands stricter thermal control, while NE3512M04 trades AGC integration for higher-frequency capability and GaAs performance - neither is pin-compatible, requiring PCB redesign.
Availability
BF904R,215 is available at Aetrix Electronics and suitable for television tuners, professional VHF receivers, UHF wireless microphones, and RF test equipment requiring stable component supply across long-lifecycle consumer and industrial programs.
Supply support for BF904R,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 secure connectivity solutions for automotive, industrial, and consumer markets.
The BF904R,215 belongs to NXP's legacy RF transistor product line, engineered specifically for high-linearity, low-noise VHF/UHF amplifier applications in broadcast and communications equipment.
FAQ
What is the maximum drain-source voltage rating for BF904R,215?
The BF904R,215 has a maximum drain-source voltage (VDS) rating of 7 V, as specified in the Absolute Maximum Ratings table. This limit applies under all operating conditions and must not be exceeded to prevent permanent device damage. Operation at 5 V drain supply is recommended for optimal noise and gain performance per the datasheet's dynamic characteristics section.
How does BF904R,215 differ from BF904,215 in physical construction?
The BF904R,215 uses the SOT143R package with reverse pinning (Pin 1 = source, Pin 2 = drain, Pin 3 = gate 2, Pin 4 = gate 1), whereas BF904,215 uses SOT143B with standard pinning (Pin 1 = source, Pin 2 = drain, Pin 3 = gate 1, Pin 4 = gate 2). Both share identical electrical specifications but require different PCB footprints and cannot be substituted without layout revision.
What is the typical noise figure of BF904R,215 at 200 MHz?
The BF904R,215 achieves a typical noise figure (F) of 1.0 dB at 200 MHz under conditions of GS = 2 mS and BS = BSopt, as documented in the Dynamic Characteristics table. This value reflects its optimized low-noise performance in VHF broadcast bands, making it suitable for high-fidelity TV tuner front-ends.
Can BF904R,215 operate reliably at 7 V drain supply?
Yes, BF904R,215 is rated for up to 7 V drain-source voltage, but its thermal derating curve specifies that total power dissipation must be reduced to 200 mW only when ambient temperature stays ≤40 °C. At 7 V and 30 mA drain current, power dissipation reaches 210 mW - exceeding safe limits unless heatsinking or forced cooling is applied.
What is the gate 1-source threshold voltage range for BF904R,215?
The gate 1-source threshold voltage (VG1-S(th)) for BF904R,215 is specified from 0.3 V to 1.0 V at Tj = 25 °C, VG2-S = 4 V, VDS = 5 V, and ID = 20 µA. This range ensures consistent turn-on behavior across production lots and supports reliable biasing in AGC-controlled amplifier designs.
BF904R,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:
- 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:
- SOT-143R
BF904R,215 FAQ
1.How can I place an order for BF904R,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF904R,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 BF904R,215 reliable?
The price and inventory of BF904R,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF904R,215 is usually 5 days.
3.What payment methods are accepted for BF904R,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF904R,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF904R,215?
BF904R,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF904R,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 BF904R,215?
For technical support, including BF904R,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF904R,215 requirements.
6.How does Aetrix verify that BF904R,215 is sourced from the original manufacturer or authorized distributors?
All BF904R,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 BF904R,215 meets industry standards.
7.What is the process for return or replacement of BF904R,215?
All BF904R,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF904R,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 BF904R,215 part is unused and in its original packaging.
Return procedure for BF904R,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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