NXP Semiconductors BF1202WR,115

Overview

BF1202WR from NXP Semiconductors is an enhancement-type N-channel dual-gate PoLo MOSFET with source and substrate internally connected, designed for low-noise VHF/UHF RF amplification in 3–9 V supply systems. It delivers 30 mS typical forward transfer admittance, 1.7 pF input capacitance at gate 1, 1.1 dB noise figure at 800 MHz, and supports cross-modulation performance up to 105 dBµV at 40 dB AGC - ideal for digital/analogue TV tuners and professional communications receivers.

For engineers reviewing the BF1202WR datasheet, BF1202WR pinout, BF1202WR application, or BF1202WR equivalent, key selection considerations include its SOT343R package, dual-gate self-biasing architecture, 10 V drain-source breakdown voltage, and verified RF gain stability under AGC control in UHF front-end stages.

Technical Context

The BF1202WR employs a dual-gate structure where gate 2 (G2) acts as a high-impedance RF input control terminal and gate 1 (G1) serves as the AGC-controlled signal path modulator. Integrated diodes between both gates and source provide ESD protection against input voltage surges.

Its partly internal self-biasing circuit ensures stable DC operating point and minimizes cross-modulation distortion during automatic gain control - critical for maintaining signal fidelity in multi-channel VHF/UHF tuner architectures with dynamic interference environments.

Key Specifications

Pinout & Package

The BF1202WR is housed in a plastic surface-mounted SOT343R package (4 leads, reverse pinning), measuring 2.2 × 1.35 × 0.9 mm, with lead pitch of 0.5 mm and soldering-point thermal resistance of 155 K/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-gate RF amplifier applications.

Compared with BF1202R and BF998, the BF1202WR offers optimal balance of thermal efficiency (155 K/W), proven cross-modulation immunity (105 dBµV), and SOT343R space savings - making it the preferred choice for high-density, AGC-critical VHF/UHF tuner modules.

Availability

BF1202WR is available at Aetrix Electronics and suitable for digital television tuners, professional UHF radio receivers, analogue TV IF strips, and wireless microphone front ends requiring stable component supply across production lifecycles.

Supply support for BF1202WR 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 leader specializing in high-performance RF, analog, and mixed-signal solutions for communications, automotive, and industrial markets.

The BF1202WR belongs to NXP's PoLo (Polarity Logic) dual-gate MOSFET product line, engineered specifically for low-noise, AGC-stable RF amplification in broadcast and professional wireless equipment operating from 30 MHz to 1 GHz.

FAQ

What is the maximum drain-source voltage rating for the BF1202WR?

The BF1202WR has a maximum drain-source voltage (V_DS) rating of 10 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. The BF1202WR is intended for low-voltage RF amplifier applications with supply rails between 3 V and 9 V, and its 10 V rating provides necessary headroom for transient signal peaks in VHF/UHF tuner circuits.

How does the BF1202WR achieve low cross-modulation in AGC-controlled systems?

The BF1202WR achieves low cross-modulation through a partly internal self-biasing circuit that stabilizes the DC operating point during AGC voltage changes, combined with dual-gate architecture that isolates RF input (gate 2) from gain control (gate 1). At 40 dB AGC, the BF1202WR maintains a cross-modulation threshold of 100–105 dBµV - verified in the datasheet's Fig.15 and Quick Reference Data - ensuring minimal inter-channel interference in multi-signal TV tuner environments.

What package type is used for the BF1202WR and how does it differ from BF1202 and BF1202R?

The BF1202WR uses the SOT343R plastic surface-mounted package (4 leads, reverse pinning), measuring 2.2 × 1.35 × 0.9 mm. In contrast, BF1202 uses SOT143B (3.0 × 1.4 mm, standard pinout) and BF1202R uses SOT143R (3.0 × 1.4 mm, reverse pinout). The BF1202WR's smaller footprint and lower thermal resistance (155 K/W vs. 185 K/W for BF1202R) make it suitable for space-constrained, thermally demanding tuner modules where the BF1202WR is the only variant in the family with this optimized package.

Can the BF1202WR be used in 800 MHz LTE band applications?

Yes, the BF1202WR is characterized for operation up to 1 GHz and delivers verified performance at 800 MHz: 1.1 dB noise figure, 26.5 dB power gain, and 30 mS forward transfer admittance under standard test conditions (V_DS = 5 V, V_G2-S = 4 V, I_D = 12 mA). Its low Crss (15–30 fF) and unconditional stability per S-parameter data (Table 1) support robust 800 MHz amplifier design, though system-level matching networks must be optimized per application layout.

What is the gate threshold voltage range for Gate 1 and Gate 2 of the BF1202WR?

The BF1202WR specifies V_G1-S(th) (gate 1–source threshold voltage) between 0.3 V and 1.0 V, and V_G2-S(th) (gate 2–source threshold voltage) between 0.3 V and 1.2 V, both measured under defined conditions (V_DS = 5 V, I_D = 100 µA). These thresholds enable precise AGC control via gate 1 while maintaining high-impedance RF input at gate 2 - a key enabler of its low-noise, high-linearity behavior in tuner front ends.