NXP Semiconductors BF1202R,215

Overview

BF1202R from NXP Semiconductors is an enhancement-type N-channel dual-gate PoLo MOSFET with source and substrate internally connected, designed for 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, and 1.1 dB noise figure at 800 MHz, enabling low-noise gain-controlled amplifier stages in TV tuners and professional communications equipment.

For engineers reviewing the BF1202R datasheet, BF1202R pinout, BF1202R application, or BF1202R equivalent, key selection criteria include its dual-gate architecture for AGC control, internal self-biasing for cross-modulation suppression, SOT143R package compatibility, and verified performance at 800 MHz with 12 mA drain current and 5 V drain-source bias.

Technical Context

The BF1202R employs a short-channel dual-gate structure where gate 2 (G2) serves as the primary RF input control terminal while gate 1 (G1) enables automatic gain control (AGC) via variable bias. Integrated diodes between each gate and source provide surge protection against excessive input voltage transients.

Its partly internal self-biasing circuit ensures stable DC operating point under varying AGC conditions, directly supporting consistent cross-modulation performance - measured at 100–105 dBµV input level for k = 1% distortion at 40 dB AGC - without external bias network complexity.

Key Specifications

Pinout & Package

The BF1202R is housed in the SOT143R plastic surface-mounted package (reverse pinning), measuring 3.0 × 1.4 mm with 0.95 mm height and 1.9 mm lead pitch. This compact 4-lead outline supports high-density RF board layouts and reflow soldering compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BF1202 and BF1202WR, the BF1202R offers reverse-pin SOT143R compatibility - enabling drop-in replacement on existing SOT143R layouts - while maintaining identical RF performance and AGC behavior, making it ideal for tuner redesigns requiring mechanical fit without circuit modification.

Availability

BF1202R is available at Aetrix Electronics and suitable for VHF/UHF tuners, professional communications equipment, and low-noise RF amplifier modules requiring stable component supply across industrial and broadcast product lifecycles.

Supply support for BF1202R 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 automotive, industrial, and consumer applications.

The BF1202R belongs to NXP's PoLo (Polarity Logic) dual-gate MOSFET product line, engineered specifically for low-noise, AGC-capable RF amplification in broadcast and communications systems operating up to 1 GHz.

FAQ

What is the maximum drain-source voltage rating for the BF1202R?

The BF1202R has a maximum drain-source voltage (V_DS) rating of 10 V, as specified in the Absolute Maximum Ratings table. This value represents the peak DC or RF voltage that can be safely applied between drain and source terminals without risk of avalanche breakdown or permanent device damage. Operation beyond this limit may cause irreversible failure, especially under pulsed or high-temperature conditions.

How does the BF1202R achieve low cross-modulation in AGC applications?

The BF1202R achieves low cross-modulation through its partly internal self-biasing circuit, which stabilizes the DC operating point during automatic gain control. At 40 dB AGC, the BF1202R maintains a cross-modulation threshold of 100–105 dBµV - meaning it resists intermodulation distortion even when amplifying multiple strong signals simultaneously - without requiring external bias compensation networks.

Is the BF1202R pin-compatible with the BF1202?

No, the BF1202R is not pin-compatible with the BF1202. While both share identical electrical specifications, the BF1202 uses SOT143B packaging with standard pinning (1=source, 2=drain, 3=gate1, 4=gate2), whereas the BF1202R uses SOT143R with reverse pinning (1=source, 2=drain, 3=gate2, 4=gate1). PCB layout revision is required to substitute one for the other.

What is the typical noise figure of the BF1202R at 400 MHz?

The BF1202R exhibits a typical noise figure of 0.9 dB at 400 MHz under standard test conditions (V_DS = 5 V, V_G2-S = 4 V, I_D = 12 mA, Y_S = Y_S,opt). This value reflects its optimized small-signal performance in UHF receiver front-ends, where minimizing added noise is essential for maintaining signal integrity in weak-signal environments.

Does the BF1202R require external gate protection diodes?

No, the BF1202R does not require external gate protection diodes. It integrates protection diodes between each gate (G1 and G2) and the source terminal, safeguarding against electrostatic discharge and input voltage surges up to ±10 mA gate current limits. This eliminates the need for discrete ESD protection components in most RF front-end designs.