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NXP Semiconductors BF1211R,215
- Part No.:
- BF1211R,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Single FETs, MOSFETs
- Package:
- SOT-143R
- Datasheet:
-
BF1211R,215.pdf
- Description:
- RF MOSFET 5V SOT143R
- Quantity:
- Payment:
- Shipping:
Inventory:4,130
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Product details
Overview
BF1211R from NXP Semiconductors is an enhancement-type N-channel dual-gate MOSFET designed for low-noise, gain-controlled VHF/UHF amplification in 5 V TV tuners. It features 30 mS typical forward transfer admittance, 2.1 pF input capacitance at gate 1, 0.9 dB noise figure at 400 MHz, and operates with drain-source voltage up to 6 V and drain current up to 30 mA.
For engineers reviewing the BF1211R datasheet, BF1211R pinout, BF1211R application, or BF1211R equivalent, this page delivers verified electrical parameters, SOT143R package details, dual-gate biasing behavior, cross-modulation performance at 40 dB AGC, and direct alternatives for tuner front-end design.
Technical Context
The BF1211R integrates internal diodes between each gate and source for ESD protection and employs a partly self-biasing circuit to stabilize DC operating point during AGC. Its dual-gate architecture enables independent control of RF signal path (gate 1) and gain regulation (gate 2), supporting precise noise and linearity trade-offs.
It exhibits 15–30 fF reverse transfer capacitance at 1 MHz and maintains 100–105 dBµV cross-modulation input level at 40 dB AGC, confirming suitability for analog/digital television tuner IF/RF stages where low-frequency noise and AGC stability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 6 V maximum - defines absolute upper limit for drain-to-source voltage in tuner supply rail designs |
| ID | 30 mA maximum - sets peak small-signal amplifier current capability under 5 V bias |
| |yfs| | 30 mS typical - determines small-signal transconductance and gain scalability in VHF/UHF bands |
| Cig1-ss | 2.1 pF typical - directly impacts input matching network design at gate 1 for 50 Ω systems |
| F | 0.9 dB typical at 400 MHz - quantifies minimum added noise in UHF tuner front-end applications |
| Xmod | 105 dBµV at 40 dB AGC - specifies maximum tolerable interference level before 1% distortion occurs |
| Tj | 150 °C maximum - constrains thermal design margin for surface-mount placement on tuner PCBs |
Pinout & Package
BF1211R is housed in the SOT143R plastic surface-mounted package with reverse pinning (4 leads), measuring 3.0 × 1.4 mm with 1.9 mm lead pitch. Thermal resistance from junction to soldering point is 185 K/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Source | Common reference node for both gates and drain; internally connected to substrate |
| 2 | Drain | Output terminal carrying amplified RF signal; requires DC blocking and impedance matching |
| 3 | Gate 2 | AGC control input; biased at 4 V typical to regulate gain without affecting gate 1 RF path |
| 4 | Gate 1 | RF signal input terminal; high-impedance node requiring careful layout to minimize parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual-gate architecture | Enables independent RF signal injection (gate 1) and gain control (gate 2), eliminating need for external AGC diodes or variable resistors |
| Integrated gate-source protection diodes | Prevents damage from ESD or transient overvoltage during tuner assembly or field operation without adding external components |
| Partly internal self-biasing | Stabilizes quiescent current across temperature and process variation, maintaining consistent cross-modulation performance during AGC |
| Low 0.9 dB noise figure at 400 MHz | Meets stringent SNR requirements for digital terrestrial TV reception in UHF band without cascaded LNA stages |
| 2.1 pF input capacitance at gate 1 | Reduces matching network complexity in 50 Ω tuner designs, enabling compact microstrip or lumped-element solutions |
Applications
| TV Tuner RF Amplifier | UHF Signal Pre-amplifier |
|---|---|
|
Use Scenario: Front-end amplification stage in 5 V digital/analog TV tuners operating from 47–862 MHz. IC Role / Device Role / Timing Role: Dual-gate MOSFET providing gain-controlled, low-noise amplification with AGC interface via gate 2. Use Value: Achieves 105 dBµV cross-modulation immunity at 40 dB AGC, ensuring robust reception in multi-channel broadcast environments. |
Use Scenario: Low-noise pre-amplifier for UHF antenna signals prior to mixer stage in set-top boxes. IC Role / Device Role / Timing Role: RF amplifier with gate 1 as signal input and gate 2 as gain control node synchronized to system AGC loop. Use Value: Delivers 0.9 dB noise figure at 400 MHz and 30 mS |yfs, enabling high sensitivity without degrading channel selectivity. |
| VHF Broadcast Receiver | Analog TV IF Amplifier |
|
Use Scenario: First-stage amplifier in portable VHF broadcast receivers (e.g., FM radio or aviation band). IC Role / Device Role / Timing Role: Enhancement-mode N-channel MOSFET configured in common-source topology with self-biased gate 2. Use Value: Maintains stable 11–19 mA drain current across gate 2 voltage range (1–4 V), simplifying bias network design. |
Use Scenario: Gain-variable IF amplifier in legacy analog TV demodulator circuits operating near 38–46 MHz. IC Role / Device Role / Timing Role: Dual-gate transistor used with gate 1 as IF input and gate 2 as video sync-derived gain control. Use Value: Supports >34 dB power gain at 200 MHz and <1.6 dB noise figure, preserving signal integrity in baseband recovery. |
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 |
|---|---|---|---|
| BF1211 | SOT143B package with standard pinning (1=source, 2=drain, 3=gate1, 4=gate2); identical electrical specs | Requires PCB layout revision due to reversed gate/drain pin order vs. BF1211R | Select when redesigning tuner boards to simplify gate 1 routing or align with legacy SOT143B footprint libraries |
| BF1211WR | SOT343R package (2.2 × 1.35 mm), lower Rth(j-s) = 155 K/W, same pinout as BF1211R but smaller footprint | Better thermal performance in space-constrained tuner modules; not drop-in due to different land pattern | Choose for next-generation compact tuners needing improved power dissipation density without changing gate control logic |
Compared with BF1211 and BF1211WR, the BF1211R offers identical RF performance in the SOT143R package-enabling direct replacement where reverse pinning matches existing layout, while BF1211WR provides superior thermal efficiency in miniaturized designs.
Availability
BF1211R is available at Aetrix Electronics and suitable for TV tuner RF amplifiers, UHF pre-amplifiers, VHF broadcast receivers, and analog TV IF amplifiers requiring stable component supply across production lifecycles.
Supply support for BF1211R 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 communication markets.
The BF1211R belongs to NXP's legacy dual-gate MOSFET product line engineered specifically for low-noise, gain-stable amplification in 5 V television tuner applications.
FAQ
What is the maximum drain-source voltage rating for BF1211R?
The BF1211R has a maximum drain-source voltage (VDS) rating of 6 V, as specified in the Absolute Maximum Ratings table. This value defines the upper limit for safe DC biasing in tuner applications and must not be exceeded even under transient conditions. The BF1211R is intended for use in 5 V systems, where this margin ensures reliable operation during power-up, AGC transients, and signal overload events.
How does BF1211R achieve low cross-modulation in TV tuner applications?
The BF1211R achieves low cross-modulation through its partly internal self-biasing circuit, which stabilizes DC operating point during AGC action, and its dual-gate structure that isolates gain control (gate 2) from RF signal path (gate 1). At 40 dB AGC, the BF1211R delivers 100–105 dBµV input level for 1% distortion-directly supporting robust multi-channel digital TV reception without external compensation networks.
Is BF1211R pin-compatible with BF1211?
No, BF1211R is not pin-compatible with BF1211. While both share identical electrical specifications, BF1211R uses SOT143R packaging with reverse pinning (pin 3 = gate 2, pin 4 = gate 1), whereas BF1211 uses SOT143B with standard pinning (pin 3 = gate 1, pin 4 = gate 2). PCB layout modification is required to substitute BF1211R for BF1211 or vice versa.
What is the typical noise figure of BF1211R at 800 MHz?
The typical noise figure of BF1211R at 800 MHz is 1.3 dB, as documented in the Dynamic Characteristics table under conditions of VDS = 5 V, VG2-S = 4 V, ID = 15 mA, and YS = YS(opt). This value confirms the BF1211R's suitability for high-frequency tuner stages where minimizing added noise in the upper UHF band is essential for digital signal integrity.
Does BF1211R include ESD protection?
Yes, BF1211R includes integrated diodes between each gate and source to protect against electrostatic discharge and input voltage surges. This built-in protection eliminates the need for external ESD components in tuner front-end designs and is explicitly noted in the device description section of the datasheet. The BF1211R is supplied in anti-static packaging to further safeguard against handling damage.
BF1211R,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:
- 400MHz
- Gain:
- 29dB
- Voltage - Test:
- 5 V
- Current Rating (Amps):
- 30mA
- Noise Figure:
- 0.9dB
- Current - Test:
- 15 mA
- Power - Output:
- -
- Voltage - Rated:
- 6 V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143R
BF1211R,215 FAQ
1.How can I place an order for BF1211R,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BF1211R,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 BF1211R,215 reliable?
The price and inventory of BF1211R,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF1211R,215 is usually 5 days.
3.What payment methods are accepted for BF1211R,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF1211R,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BF1211R,215?
BF1211R,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BF1211R,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 BF1211R,215?
For technical support, including BF1211R,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF1211R,215 requirements.
6.How does Aetrix verify that BF1211R,215 is sourced from the original manufacturer or authorized distributors?
All BF1211R,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 BF1211R,215 meets industry standards.
7.What is the process for return or replacement of BF1211R,215?
All BF1211R,215 units undergo pre-shipment inspection (PSI). If there is an issue with BF1211R,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 BF1211R,215 part is unused and in its original packaging.
Return procedure for BF1211R,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BF1211R,215 Tags
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SAV-541+
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