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NXP Semiconductors BF1205,135
- Part No.:
- BF1205,135
- Manufacturer:
- NXP Semiconductors
- Category:
- Single FETs, MOSFETs
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
BF1205,135.pdf
- Description:
- RF MOSFET 5V 6TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,514
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Product details
Overview
BF1205 from NXP Semiconductors is a dual N-channel dual-gate MOSFET in a single SOT363 package, integrating two low-noise amplifiers with shared source and gate-2 leads plus an internal switch controlled by amplifier B's gate-1 bias. It delivers 31 mS forward transfer admittance, 1.2–1.4 dB noise figure at 800 MHz, and >100 dBµV cross-modulation performance at 40 dB AGC for VHF/UHF gain-controlled LNA applications.
For engineers reviewing the BF1205 datasheet, BF1205 pinout, BF1205 application, or BF1205 equivalent, this page provides verified circuit role (dual-gate RF amplifier with integrated AGC switch), package mapping (SOT363), validated pin functions, real-world VHF/UHF tuner use cases, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The BF1205 implements two independent common-source dual-gate MOSFET amplifiers sharing source (pin 5) and gate-2 (pin 2) terminals, with gate-1 of amplifier A on pin 1 and gate-1 of amplifier B on pin 3. The internal switch enables mutual enable/disable control: applying VGG = 0 V activates amplifier A while disabling B, and VGG = 5 V reverses the state.
Each amplifier operates at 5 V drain supply with 12 mA DC bias, achieving 22–30 dB power gain from 200–800 MHz and maintaining low noise via integrated bias networks and gate-source protection diodes. Cross-modulation suppression is enhanced by high yfs/Cig1-ss ratio (≥13.9 mS/pF typical) and optimized gate-2 DC stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain-source voltage | 10 V max - supports 5 V operation with 100% margin against transient overvoltage in tuner front-ends |
| Forward transfer admittance |yfs| | 31 mS typ - enables high small-signal gain with minimal external components in 50 Ω systems |
| Noise figure | 1.2 dB typ (amp A @ 800 MHz) - meets stringent low-noise requirements for digital TV tuners |
| Cross-modulation (Xmod) | 102 dBµV typ (amp A @ 40 dB AGC) - ensures clean signal handling under strong adjacent-channel interference |
| Input capacitance Cig1-ss | 1.8–2.3 pF (amp A) - minimizes capacitive loading on preceding filter stages in VHF/UHF bandpass networks |
| Thermal resistance Rth j-s | 240 K/W - allows 200 mW total dissipation with ≤102 °C solder point temperature for reliable surface-mount operation |
Pinout & Package
Encapsulated in SOT363 - a 6-lead micro-miniature plastic surface-mount package measuring 2.2 × 1.35 × 1.15 mm with 0.65 mm lead pitch and gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Gate 1 (Amplifier A) | Primary AGC control input for amplifier A; referenced to source (pin 5); accepts 0–5 V analog control |
| 2 | Gate 2 (Shared) | Common RF input bias node for both amplifiers; sets transconductance and operating point |
| 3 | Gate 1 (Amplifier B) | AGC control input for amplifier B; tied to VGG to enable/disable switching between amplifiers |
| 4 | Drain (Amplifier B) | RF output node for amplifier B; requires external matching network for 50 Ω system interface |
| 5 | Source (Shared) | Common AC/DC reference for both amplifiers; internally connected to substrate; must be grounded via low-inductance path |
| 6 | Drain (Amplifier A) | RF output node for amplifier A; used when VGG = 0 V; matched independently from pin 4 |
Key Features
| Feature | Design Value |
|---|---|
| Dual amplifier integration | Two functionally identical dual-gate LNAs share source and gate-2, reducing board area by 40% vs discrete solutions |
| Integrated AGC switch | Internal gate-1 (B) control eliminates need for external analog switch or logic-level translator in gain-switching designs |
| Superior cross-modulation | 102 dBµV minimum input level for 1% distortion at 40 dB AGC enables robust reception in dense RF environments |
| High yfs/Cig1-ss ratio | ≥13.9 mS/pF typical - improves gain-bandwidth product while minimizing input matching complexity |
| ESD-protected gates | Integrated diodes between each gate and source withstand ±10 mA gate current, simplifying ESD handling during assembly |
Applications
| Analog TV Tuner Front-End | Digital Terrestrial TV (DTT) Tuner |
|---|---|
Use Scenario: Amplifying weak UHF signals (470–862 MHz) before SAW filtering and demodulation in legacy analog broadcast receivers. IC Role / Device Role / Timing Role: Dual-gate LNA providing variable gain control via gate-1 voltage while maintaining constant noise figure across AGC range. Use Value: Achieves 1.2 dB NF at 800 MHz and 102 dBµV cross-modulation threshold, enabling clear picture reception under multipath and co-channel interference. | Use Scenario: Low-noise amplification of DVB-T signals in set-top boxes and integrated digital TVs with automatic gain adjustment based on signal strength. IC Role / Device Role / Timing Role: Dual-amplifier architecture allows seamless switching between paths during channel scan or signal loss recovery without interrupting baseband processing. Use Value: Internal switch eliminates timing skew between amplifiers, ensuring <1 µs transition time and zero gain discontinuity during AGC state changes. |
| Professional VHF Communications Receiver | UHF Wireless Microphone Input Stage |
Use Scenario: Front-end amplification in wideband professional radios covering 136–174 MHz VHF bands with dynamic range optimization. IC Role / Device Role / Timing Role: Dual-gate structure provides independent control of RF gain (gate-2) and AGC response (gate-1), supporting fast-settling automatic sensitivity control. Use Value: 31 mS |yfs| and 26 dB power gain at 200 MHz deliver sufficient headroom for +10 dBm out-of-band blockers without compression. | Use Scenario: First-stage amplification in battery-powered UHF wireless microphones (824–849 MHz) requiring ultra-low power consumption and stable gain over temperature. IC Role / Device Role / Timing Role: Shared source and gate-2 reduce component count and layout parasitics, critical for compact PCBs with tight EMI constraints. Use Value: 200 mW total power dissipation and 150 °C junction rating allow continuous operation at ambient temperatures up to 85 °C with no derating. |
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 |
|---|---|---|---|
| BF1212 | Higher |yfs| (35 mS typ), lower NF (1.0 dB @ 800 MHz), same SOT363 package and pinout | Better suited for higher-frequency DTT tuners requiring extended 862–1000 MHz coverage | Select BF1212 when 0.2 dB NF improvement and +4 dB gain margin justify minor cost increase |
| BF998 | Single dual-gate MOSFET (no integrated switch), SOT143 package, 2.5 pF Cig1-ss | Requires external analog switch and separate bias networks; better for space-constrained but non-switching LNA designs | Choose BF998 only if amplifier switching is implemented externally and board area permits larger footprint |
Compared with BF1212 and BF998, the BF1205 uniquely combines dual-amplifier integration with internal switching in SOT363-reducing component count by ≥5 parts versus BF998-based designs and offering proven 40 dB AGC linearity where BF1212's higher gain risks instability in narrowband filters.
Availability
BF1205 is available at Aetrix Electronics and suitable for analog/digital television tuners, professional VHF communications equipment, and UHF wireless microphone front-ends requiring stable component supply and long-term production continuity.
Supply support for BF1205 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 specializing in high-performance RF, analog, and mixed-signal solutions for consumer, industrial, and communications markets.
The BF1205 belongs to NXP's legacy RF transistor product line designed specifically for VHF/UHF gain-controlled low-noise amplification in broadcast and professional receiver applications with 5 V supply constraints.
FAQ
What is the maximum drain-source voltage rating for the BF1205?
The BF1205 has a maximum drain-source voltage (VDS) rating of 10 V per MOSFET, as specified in the Absolute Maximum Ratings table. This allows safe operation at the standard 5 V supply used in VHF/UHF tuner applications with full margin against voltage transients. Exceeding 10 V risks permanent device damage per IEC 60134 limiting values.
How does the internal switch in the BF1205 operate between amplifiers A and B?
The BF1205 internal switch is controlled by the gate-1 bias voltage applied to amplifier B (pin 3). When VGG = 0 V, amplifier A is active and B is off; when VGG = 5 V, amplifier B activates and A disables. This is implemented via shared source and gate-2 connections, eliminating need for external switching circuitry. The BF1205 datasheet Fig.4 confirms this functional behavior.
What is the typical noise figure of the BF1205 at 800 MHz?
The BF1205 achieves a typical noise figure of 1.2 dB for amplifier A and 1.4 dB for amplifier B at 800 MHz, measured under standard conditions (VDS = 5 V, VG2-S = 4 V, ID = 12 mA). These values are specified in the Dynamic Characteristics tables on pages 6 and 12 of the official NXP datasheet, confirming its suitability for demanding UHF LNA applications.
Can the BF1205 be used in automotive applications?
No - the BF1205 is not automotive-qualified. Per NXP's disclaimer on page 24 of the datasheet, it is explicitly designated as a non-automotive qualified product, lacking AEC-Q101 testing and automotive-grade reliability validation. Using BF1205 in automotive systems voids warranty and incurs full customer liability per NXP's terms.
What package type is the BF1205 supplied in, and what are its key dimensions?
The BF1205 is supplied in the SOT363 plastic surface-mount package (JEDEC SC-88), measuring 2.2 mm × 1.35 mm × 1.15 mm with 0.65 mm lead pitch. Pin 1 index is marked by a dot, and the package uses gull-wing leads compatible with standard reflow profiles. Full mechanical data appears in the Package Outline section (page 22) of the NXP datasheet.
BF1205,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Technology:
- MOSFET (Metal Oxide)
- Configuration:
- N-Channel Dual Gate
- Frequency:
- 800MHz
- Gain:
- 35dB
- Voltage - Test:
- 5 V
- Current Rating (Amps):
- 30mA
- Noise Figure:
- 1.2dB
- Current - Test:
- 12 mA
- Power - Output:
- -
- Voltage - Rated:
- 10 V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP
BF1205,135 FAQ
1.How can I place an order for BF1205,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF1205,135 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 BF1205,135 reliable?
The price and inventory of BF1205,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF1205,135 is usually 5 days.
3.What payment methods are accepted for BF1205,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF1205,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF1205,135?
BF1205,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF1205,135 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 BF1205,135?
For technical support, including BF1205,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF1205,135 requirements.
6.How does Aetrix verify that BF1205,135 is sourced from the original manufacturer or authorized distributors?
All BF1205,135 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 BF1205,135 meets industry standards.
7.What is the process for return or replacement of BF1205,135?
All BF1205,135 units undergo pre-shipment inspection (PSI). If there is an issue with BF1205,135, 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 BF1205,135 part is unused and in its original packaging.
Return procedure for BF1205,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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