NXP Semiconductors BF1214,115

Overview

BF1214 from NXP Semiconductors is a dual N-channel dual-gate MOSFET amplifier IC integrating two independent low-noise gain-controlled amplifiers in a single SOT363 package, sharing source and gate2 terminals. It delivers 32 mS forward transfer admittance at 100 MHz, 0.9 dB noise figure at 400 MHz, and 105 dBµV cross modulation performance at 40 dB AGC - optimized for VHF/UHF tuner front-ends in 5 V supply systems.

For engineers reviewing the BF1214 datasheet, BF1214 pinout, BF1214 application, or BF1214 equivalent, this page provides verified circuit role (dual-gate RF amplifier), package mapping (SOT363), pin-level terminal functions, key RF parameters (NF, |yfs|, Xmod), and confirmed alternatives for VHF/UHF AGC amplifier designs.

Technical Context

The BF1214 implements two matched dual-gate MOSFETs with internally interconnected source and substrate, enabling DC stabilization and superior cross modulation suppression during automatic gain control. Each amplifier features integrated bias networks and gate-source protection diodes against input voltage surges.

Its dual-gate architecture allows independent control of transconductance via gate2 (AGC path) while maintaining high forward transfer admittance (32 mS typ.) and low noise figure (0.9 dB @ 400 MHz) - critical for high-linearity, low-distortion RF amplification in tuners and communication receivers.

Key Specifications

Pinout & Package

SOT363 plastic surface-mounted package (6 leads); dimensions: 2.2 mm × 1.35 mm × 1.1 mm height; thermal resistance Rth(j-sp) = 240 K/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BF998,115 and MRF901LT1G, the BF1214 uniquely integrates two matched dual-gate amplifiers with shared AGC control in SOT363 - reducing component count, PCB area, and inter-stage mismatch in dual-tuner or diversity receiver designs.

Availability

BF1214 is available at Aetrix Electronics and suitable for digital TV tuners, professional UHF radios, analog TV upgrades, and low-power spectrum monitoring requiring stable component supply and consistent RF performance across production batches.

Supply support for BF1214 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 applications.

The BF1214 belongs to NXP's legacy RF transistor portfolio designed specifically for high-linearity, low-noise VHF/UHF amplifier applications in broadcast and professional communication equipment.

FAQ

What is the primary function of the BF1214 in RF signal chains?

The BF1214 serves as a dual low-noise, gain-controlled RF amplifier - integrating two independent N-channel dual-gate MOSFETs in one SOT363 package. Its primary function is to provide stable, low-distortion amplification in VHF/UHF tuner front-ends, with gate2 enabling synchronized automatic gain control across both amplifiers. The BF1214 achieves this through matched device characteristics, shared source/bias, and integrated protection diodes.

Does the BF1214 support true dual-channel operation with independent inputs and outputs?

Yes, the BF1214 supports true dual-channel operation: Pin 1 (drain A) and Pin 3 (drain B) are electrically isolated RF outputs, while Pins 6 (gate1 A) and 4 (gate1 B) serve as independent RF inputs. Gate2 (Pin 5) is shared for AGC control, and the source (Pin 2) is common to both amplifiers - enabling either synchronized or decoupled channel operation depending on external biasing.

What is the maximum operating frequency validated for the BF1214?

The BF1214 is validated for operation up to 1000 MHz, with published scattering parameters (S-parameters) and noise data at frequencies from 40 MHz to 1000 MHz. Transducer power gain remains >22 dB at 800 MHz and >18 dB at 1000 MHz for both amplifiers, confirming usability across full UHF and lower L-band spectrum - though optimal noise and linearity performance occurs below 900 MHz.

How does the BF1214 handle electrostatic discharge (ESD) protection?

The BF1214 incorporates integrated diodes between each gate1 terminal (Pins 4 and 6) and the source (Pin 2), providing inherent ESD protection rated to ±10 mA gate current per IEC 61000-4-2 Level 2. This eliminates need for external TVS diodes in most tuner applications. However, handling precautions remain essential - the datasheet explicitly cautions that the device is ESD-sensitive during transport and PCB assembly.

Can the BF1214 be used in 3.3 V supply systems?

No - the BF1214 is characterized and specified exclusively for 5 V drain-source operation (VDS = 5 V). Its static and dynamic parameters - including 18 mA nominal drain current, 32 mS |yfs|, and 0.9 dB NF - are all measured at VDS = 5 V and VG2-S = 4 V. Operation at 3.3 V falls outside guaranteed specifications and risks degraded gain, increased noise figure, and unstable AGC response; NXP does not publish data for lower supply voltages.