NXP Semiconductors AFT31150NR5

Overview

AFT31150NR5 from NXP Semiconductors is an RF power LDMOS transistor designed for pulsed S-band radar amplification at 2700–3100 MHz. It delivers 150 W peak RF output power with 17.2 dB power gain and 49.0% drain efficiency at 32 V_DD, operating under 300 μs pulse width and 15% duty cycle. Its rugged 10:1 VSWR load mismatch tolerance enables reliable operation in maritime and weather radar transmitters.

For engineers reviewing the AFT31150NR5 datasheet, AFT31150NR5 pinout, AFT31150NR5 application, or AFT31150NR5 equivalent, key selection criteria include peak RF power capability, thermal impedance (0.042 °C/W), gate-source voltage range (–6.0 to +10 V), internal input/output matching, and ESD robustness (HBM Class 2, CDM Class C3).

Technical Context

This N-channel enhancement-mode lateral MOSFET operates in Class C or pulsed AB mode with a qualified 32 V_DD supply and –40 to +225 °C junction temperature range. Its internally matched design eliminates external tuning components across 2700–3100 MHz, while integrated ESD protection and extended negative V_GS range support stable high-efficiency switching in radar pulse amplifiers.

The device uses series-equivalent large-signal impedance parameters (e.g., Z_source = 1.7 – j1.0 Ω at 3100 MHz; Z_load = 3.6 – j0.7 Ω) validated in NXP's reference circuit and narrowband production test fixtures. Thermal performance is characterized under pulsed conditions (76 °C case temp, 160 W peak), enabling accurate MTTF prediction using NXP's online calculator.

Key Specifications

Pinout & Package

Package: OM-780-2L plastic over-molded package with exposed backside source terminal. Case temperature monitoring point located at center of exposed copper pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF power amplifier applications.

Compared with AFT31150NR5, CGHV1F015S offers superior bandwidth and thermal performance but demands revised gate bias and matching networks, while MRFE6VP61K25H provides voltage flexibility at the cost of efficiency and ruggedness - making AFT31150NR5 the optimal balance of integration, reliability, and radar-specific ruggedization.

Availability

AFT31150NR5 is available at Aetrix Electronics and suitable for commercial S-band radar systems, maritime radar installations, and weather radar transmitters requiring stable component supply across multi-year production cycles.

Supply support for AFT31150NR5 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 secure connectivity solutions for automotive, industrial, and communications markets, with deep expertise in RF power technologies.

The AFT31150NR5 belongs to NXP's AIRFAST® RF Power LDMOS family, engineered specifically for high-reliability pulsed radar amplifiers demanding ruggedness, thermal stability, and long-term supply assurance in defense and critical infrastructure applications.

FAQ

What is the maximum continuous drain current rating for AFT31150NR5?

AFT31150NR5 does not specify a continuous drain current rating because it is designed exclusively for pulsed operation. Its datasheet defines performance under 300 μs pulse width and 15% duty cycle conditions. The device's safe operating area is bounded by peak power (150 W), junction temperature (≤225 °C), and thermal impedance (0.042 °C/W), not DC current limits. For AFT31150NR5, design focus remains on pulsed RF envelope fidelity and thermal management rather than steady-state conduction.

Does AFT31150NR5 require external matching components in its reference circuit?

No, AFT31150NR5 is internally matched for both input and output across 2700–3100 MHz, as confirmed in the datasheet's "Features" section and verified in Table 8's reference circuit performance. While the provided 2.0″ × 3.0″ reference board includes discrete capacitors (e.g., C1–C12) for DC blocking, biasing, and harmonic suppression, these are not fundamental matching elements - the core 50 Ω input/output impedance transformation is achieved within the OM-780-2L package itself, simplifying system-level RF design.

What is the gate threshold voltage range for AFT31150NR5 at 25°C?

The gate threshold voltage (V_GS(th)) for AFT31150NR5 is specified as 0.8 to 1.6 Vdc at V_DS = 10 Vdc and I_D = 180 μAdc, per Table 5 of the datasheet. This narrow range ensures consistent turn-on behavior across production units and supports precise Class C biasing. The quiescent gate voltage (V_GS(Q)) under functional test conditions (V_DD = 32 Vdc, I_DQ = 100 mA) is 1.1–2.1 Vdc, confirming stable DC operating point control for AFT31150NR5 in radar amplifier stages.

How is thermal performance characterized for AFT31150NR5?

AFT31150NR5 thermal performance is characterized as junction-to-case thermal impedance (Z_θJC) = 0.042 °C/W under pulsed conditions: case temperature = 76 °C, 160 W peak power, 300 μs pulse width, 15% duty cycle, 32 V_DD, and I_DQ = 100 mA at 3100 MHz. This value is measured per AN1955 methodology and enables accurate junction temperature prediction using T_J = T_C + (P_diss × Z_θJC). The datasheet also provides MTTF curves versus junction temperature for lifetime estimation of AFT31150NR5 in radar applications.

Is AFT31150NR5 suitable for continuous-wave (CW) operation?

No, AFT31150NR5 is explicitly characterized and qualified for pulsed operation only - specifically 300 μs pulse width and 15% duty cycle at 2700–3100 MHz. Its maximum ratings, thermal data, and typical performance tables all assume pulsed conditions. The datasheet makes no CW specifications, and continuous operation would exceed safe junction temperature limits given its 741 W total dissipation rating at T_C = 25 °C and rapid derating above that temperature. AFT31150NR5 must be used strictly per its pulsed radar application profile.