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NXP Semiconductors BF909R,215
- Part No.:
- BF909R,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Single FETs, MOSFETs
- Package:
- SOT-143R
- Datasheet:
-
BF909R,215.pdf
- Description:
- RF MOSFET 5V SOT143R
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
BF909R,215 from NXP Semiconductors is an N-channel dual-gate MOSFET in SOT143R package, designed for low-noise RF amplification up to 1 GHz at 5 V supply. It delivers 43 mS typical forward transfer admittance, 3.6–4.3 pF gate-1 input capacitance, and 2.0–2.8 dB noise figure at 800 MHz - optimized for VHF/UHF tuner front-ends requiring stable AGC performance.
For engineers reviewing the BF909R,215 datasheet, BF909R,215 pinout, BF909R,215 application, or BF909R,215 equivalent, key selection criteria include its dual-gate architecture for gain control, cross-modulation immunity under AGC, thermal resistance of 550 K/W (junction-to-ambient), and SOT143R footprint compatibility with high-frequency layout constraints.
Technical Context
The BF909R,215 implements a short-channel enhancement-mode MOSFET with internally connected source and substrate, enabling precise AGC response. Its dual-gate structure isolates RF input (g1) from bias control (g2), supporting independent optimization of noise figure and gain linearity.
It operates with VG2-S fixed at 4 V and ID = 15 mA under standard dynamic test conditions, delivering stable yfs >36 mS and Crs <50 fF across 50–1000 MHz - critical for minimizing intermodulation distortion in multi-channel broadcast receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward transfer admittance |yfs| | 36–50 mS (typ. 43 mS): enables high small-signal gain in low-voltage RF amplifier stages |
| Noise figure F | 2.0–2.8 dB at 800 MHz: meets stringent low-noise requirements for UHF TV tuner LNA inputs |
| Input capacitance Cig1-s | 3.6–4.3 pF at 1 MHz: supports impedance matching into 50 Ω systems without excessive tuning complexity |
| Drain-source voltage VDS | Max 7 V: compatible with 5 V supply rails while allowing headroom for transient spikes |
| Total power dissipation Ptot | 200 mW up to Tamb = 40 °C: defines thermal derating limit for continuous operation on standard PCBs |
| Operating junction temperature Tj | −65 to +150 °C: ensures reliability in consumer and professional equipment ambient ranges |
| Reverse transfer capacitance Crs | 35–50 fF at 1 MHz: minimizes feedback-induced instability in common-source configurations |
Pinout & Package
NXP BF909R,215 is housed in a plastic microminiature SOT143R package (3.0 × 1.4 × 0.95 mm), optimized for high-frequency layout with short internal lead lengths and defined thermal path to soldering point (Rth j-s = 360 K/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (s, b) | Source / Substrate | Internally connected node; serves as RF ground reference and thermal conduction path to PCB |
| 2 (d) | Drain | RF output terminal; requires DC blocking and impedance-matching network for 50 Ω systems |
| 3 (g2) | Gate 2 | AGC control input; biased at 4 V for optimal cross-modulation suppression during signal level variation |
| 4 (g1) | Gate 1 | RF input terminal; high-impedance node requiring ESD protection and minimal parasitic capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gate architecture with g1/g2 isolation | Enables simultaneous RF amplification and gain control without interaction - essential for stable AGC in tuners |
| Low noise figure (2.0 dB min at 800 MHz) | Preserves SNR in weak-signal reception environments such as terrestrial digital TV (DVB-T) |
| High yfs/Cig1-s ratio | Delivers superior gain-per-capacitance trade-off, reducing matching network losses in compact VHF/UHF modules |
| SOT143R package with 0.48 mm lead pitch | Supports automated placement and reflow while maintaining RF integrity via controlled lead inductance |
| Cross-modulation immunity (Vunw < 50 dBµV @ 1% distortion) | Ensures clean multi-channel reception under strong adjacent-channel interference in broadcast applications |
Applications
| Television Tuner Front-End | Professional UHF Receiver |
|---|---|
Use Scenario: Amplifying weak VHF/UHF broadcast signals before mixer stage in analog/digital TV tuners. IC Role / Device Role / Timing Role: Low-noise RF amplifier (LNA) with dual-gate AGC control for automatic gain adjustment during channel scanning. Use Value: Maintains 2.0 dB noise figure and suppresses cross-modulation below 50 dBµV - critical for DVB-T2 signal integrity in urban multipath environments. |
Use Scenario: First-stage amplification in portable spectrum analyzers and field strength meters operating up to 1 GHz. IC Role / Device Role / Timing Role: High-linearity RF amplifier with stable gain over temperature (ID = 15 mA, VG2-S = 4 V). Use Value: Delivers 43 mS |yfs| and <50 fF Crs to minimize measurement uncertainty and spurious response in calibrated instrumentation. |
| FM Radio IF Amplifier | Wireless Microphone Preamp |
Use Scenario: Intermediate frequency amplification in FM radio receivers using 10.7 MHz IF architecture. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier with g2 biased for constant transconductance across supply variations. Use Value: Achieves 3.6–4.3 pF Cig1-s and 2.3–3.0 pF Cig2-s to support narrowband LC tank stability and low phase noise. |
Use Scenario: Microphone capsule preamplification in battery-powered UHF wireless microphones (470–698 MHz). IC Role / Device Role / Timing Role: Low-power, low-noise gain block operating from 3–5 V supply with minimal quiescent current. Use Value: Supports 40 mA max ID and 200 mW Ptot within compact SOT143R footprint - enabling miniaturized transmitter modules. |
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 |yfs| (55 mS typ), lower Crs (25 fF), SOT143 (not SOT143R); Rth j-a = 500 K/W | Better gain at 1 GHz but less AGC linearity; suited for fixed-gain LNA vs. variable-gain tuner use | Select BF998,215 when maximum small-signal gain outweighs AGC precision requirements |
| MRF901T1 | Single-gate LDMOS; higher P1dB (+13 dBm), wider bandwidth (DC–2 GHz); SO-8 package | Designed for power amplification, not low-noise AGC; incompatible pinout and bias scheme | Choose MRF901T1 only for driver-stage amplification where noise figure is secondary to output power |
Compared with BF909R,215, BF998,215 offers higher gain but reduced cross-modulation immunity, while MRF901T1 serves fundamentally different power-amplifier roles - making BF909R,215 uniquely suited for AGC-critical, low-noise VHF/UHF front-ends where dual-gate control and SOT143R thermal performance are decisive.
Availability
BF909R,215 is available at Aetrix Electronics and suitable for television tuner design, professional UHF receiver development, and wireless microphone preamplifier circuits requiring stable component supply and long-term obsolescence management.
Supply support for BF909R,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 BF909R,215 belongs to NXP's legacy RF transistor product line, engineered specifically for high-performance, low-voltage VHF/UHF amplification in broadcast and communications equipment where AGC stability and noise performance are paramount.
FAQ
What is the maximum drain-source voltage rating for BF909R,215?
The BF909R,215 has a maximum drain-source voltage (VDS) rating of 7 V, as specified in the Absolute Maximum Ratings table. This allows safe operation with 5 V supply rails while accommodating transient voltage excursions. Exceeding this limit risks permanent device damage per IEC 60134 limiting value guidelines.
How does BF909R,215 differ from BF909,215 in package and thermal performance?
The BF909R,215 uses the SOT143R package with modified lead geometry versus the SOT143 used by BF909,215, resulting in higher thermal resistance: 550 K/W (junction-to-ambient) versus 500 K/W. Its power derating begins at Tamb = 40 °C, compared to 50 °C for BF909,215 - reflecting tighter thermal constraints in the R variant.
What is the typical noise figure of BF909R,215 and at what frequency is it measured?
The BF909R,215 exhibits a typical noise figure of 2.0 dB, measured at 800 MHz under standard conditions (VDS = 5 V, VG2-S = 4 V, ID = 15 mA, GS = GSopt, BS = BSopt). The maximum specified noise figure is 2.8 dB, confirming consistent low-noise performance across production units in UHF band applications.
Can BF909R,215 be used in 3 V supply applications?
Yes, the BF909R,215 is characterized for operation from 3 V to 7 V supply voltages per its Applications section. While optimized for 5 V, its VG1-S(th) range (0.3–1.0 V) and IDSX (12–20 mA at VDS = 5 V, RG1 = 120 kΩ) support functional operation at 3 V - though |yfs| and noise figure will degrade relative to 5 V specifications.
What is the pin configuration and marking code for BF909R,215?
The BF909R,215 uses a 4-pin SOT143R package with pin 1 = source/substrate (s,b), pin 2 = drain (d), pin 3 = gate 2 (g2), and pin 4 = gate 1 (g1). Its top-marking code is %M4, as confirmed in the Pinning section of the NXP datasheet Rev. 02 (2007).
BF909R,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:
- 800MHz
- Gain:
- -
- Voltage - Test:
- 5 V
- Current Rating (Amps):
- 40mA
- Noise Figure:
- 2dB
- Current - Test:
- 15 mA
- Power - Output:
- -
- Voltage - Rated:
- 7 V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143R
BF909R,215 FAQ
1.How can I place an order for BF909R,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF909R,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 BF909R,215 reliable?
The price and inventory of BF909R,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF909R,215 is usually 5 days.
3.What payment methods are accepted for BF909R,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF909R,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF909R,215?
BF909R,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF909R,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 BF909R,215?
For technical support, including BF909R,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF909R,215 requirements.
6.How does Aetrix verify that BF909R,215 is sourced from the original manufacturer or authorized distributors?
All BF909R,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 BF909R,215 meets industry standards.
7.What is the process for return or replacement of BF909R,215?
All BF909R,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF909R,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 BF909R,215 part is unused and in its original packaging.
Return procedure for BF909R,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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