NXP Semiconductors BF1101R,215

Overview

BF1101R,215 from NXP Semiconductors is an enhancement-type N-channel dual-gate MOSFET optimized for VHF/UHF low-noise amplification in 3–7 V supply systems. It delivers 30 mS typical forward transfer admittance (|y_fs|), 2.2 pF input capacitance at gate 1 (C_ig1-ss), and 1.7 dB noise figure at 800 MHz - enabling high-gain, low-distortion RF front-end stages in TV tuners and professional communications receivers.

For engineers reviewing the BF1101R,215 datasheet, BF1101R,215 pinout, BF1101R,215 application, or BF1101R,215 equivalent, key selection criteria include its dual-gate architecture for AGC control, internal gate-source diodes for surge protection, SOT143R reverse-pin package compatibility, and verified cross-modulation performance up to 100 dBµV at 40 dB AGC.

Technical Context

The BF1101R,215 integrates two independent gates (G1 and G2) with source and substrate internally connected, supporting cascaded gain control where gate 2 (VG2-S = 4 V) sets DC bias and gate 1 (VG1-S = 0.3–1.0 V threshold) modulates signal path gain. Its short-channel structure achieves high |y_fs|/C_ig1-ss ratio for broadband amplification up to 1 GHz.

Internal gate-source diodes protect against input voltage surges, while partly self-biasing circuitry ensures stable DC operating point and low cross-modulation during automatic gain control (AGC). Noise performance is optimized at 800 MHz with F_min = 1.5 dB and Γ_opt = 0.715∠58.3°.

Key Specifications

Pinout & Package

The BF1101R,215 is housed in a plastic surface-mounted SOT143R package (reverse pinning, 4 leads), with dimensions per JEDEC SC-61AA outline: D = 2.8–3.0 mm, E = 1.2–1.4 mm, body height A = 0.9–1.1 mm. Pin 1 is source, Pin 2 is drain, Pin 3 is gate 2, and Pin 4 is gate 1 - matching Fig.2 in the datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BF1101,215 and BF1101WR,215, the BF1101R,215 uniquely balances SOT143R's reverse-pin compatibility with full 200 mW power handling and proven 100 dBµV cross-modulation margin - making it optimal for new TV tuner designs requiring layout reuse and thermal headroom.

Availability

BF1101R,215 is available at Aetrix Electronics and suitable for television tuners, professional UHF receivers, and wireless microphone preamplifiers requiring stable component supply and long-lifecycle support.

Supply support for BF1101R,215 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 BF1101R,215 belongs to NXP's legacy RF transistor family designed specifically for low-noise, high-linearity VHF/UHF amplification in broadcast and professional radio equipment.

FAQ

What is the maximum drain-source voltage rating for BF1101R,215?

The BF1101R,215 has a maximum drain-source voltage (V_DS) rating of 7 V, as specified in the Limiting Values table. This value represents the absolute maximum stress condition; recommended operating V_DS is typically ≤5 V to ensure reliability and thermal stability in continuous RF amplification applications. Exceeding 7 V risks permanent device failure.

Does BF1101R,215 require external bias resistors for gate 2 operation?

No, the BF1101R,215 incorporates a partly internal self-biasing circuit that stabilizes the DC operating point of gate 2 (VG2-S), reducing dependency on external bias networks. However, a series resistor (e.g., 120 kΩ) is still used between V_GG and gate 1 to enable AGC functionality - as shown in Fig.21 of the datasheet. Gate 2 is typically held at 4 V via a dedicated bias supply.

How does the SOT143R package differ from SOT143B in BF1101R,215 versus BF1101,215?

The BF1101R,215 uses the SOT143R package with reverse pinning (1=source, 2=drain, 4=gate2, 3=gate1), whereas BF1101,215 uses SOT143B with standard pinning (1=source, 2=drain, 3=gate2, 4=gate1). Mechanical dimensions are nearly identical, but PCB footprints are incompatible without layout revision. Both packages share the same thermal resistance (R_{th j-s} = 200 K/W) and power rating (200 mW).

What is the typical noise figure of BF1101R,215 and at what frequency is it measured?

The BF1101R,215 has a typical noise figure (F) of 1.7 dB, measured at 800 MHz under conditions of V_DS = 5 V, V_G2-S = 4 V, I_D = 12 mA, and optimal source admittance (Y_{S opt}). This value is confirmed in Table 2 of the datasheet and supports high-sensitivity reception in UHF TV and digital radio bands.

Can BF1101R,215 be used in automotive applications?

No - the BF1101R,215 is explicitly designated as a non-automotive qualified product. It is neither tested nor warranted for automotive use per NXP's disclaimer on page 14. Its qualification status is "Production" per the Product Data Sheet, but no AEC-Q100 or automotive reliability testing is documented. Use in automotive systems is at the customer's sole risk.