NXP Semiconductors AFT09MP055NR1

Overview

AFT09MP055NR1 from Freescale Semiconductor is a high-ruggedness, enhancement-mode N-channel RF power LDMOS transistor designed for common-source amplifier stages in mobile two-way radio equipment operating from 764 to 941 MHz. It delivers 57 W output power at 870 MHz with 17.5 dB power gain and 69% drain efficiency under narrowband test conditions (12.5 Vdc, IDQ(A+B) = 550 mA, CW). Its integrated input matching and ESD protection support robust broadband deployment in 800 MHz band base station and repeater final amplifiers.

For engineers reviewing the AFT09MP055NR1 datasheet, AFT09MP055NR1 pinout, AFT09MP055NR1 application, or AFT09MP055NR1 equivalent, this page provides verified technical context, narrowband/broadband performance data at 870 MHz and 764–870 MHz, ruggedness validation (>65:1 VSWR tolerance), thermal resistance (0.32 °C/W), and TO-270WB-4 gull-wing package implementation details - all confirmed from Freescale's Rev. 0 (July 2013) technical data sheet.

Technical Context

The AFT09MP055NR1 is a dual-gate, dual-drain lateral MOSFET optimized for Class AB operation in high-linearity mobile radio transmitters. Its internal structure supports simultaneous drive of Gate A/Gate B and Drain A/Drain B terminals, enabling balanced push-pull configurations without external combining networks.

It operates with a gate threshold voltage of 1.6–2.6 Vdc and exhibits low output capacitance (Coss = 61 pF) and reverse transfer capacitance (Crss = 1.9 pF) at 12.5 Vdc, supporting stable broadband matching across 764–870 MHz. The device's 225°C-rated plastic package and 0.32 °C/W junction-to-case thermal resistance enable high-power CW operation with minimal derating.

Key Specifications

Pinout & Package

Package: TO-270WB-4 gull-wing surface-mount package with exposed backside source terminal. Dimensions conform to Freescale standard outline for RF power LDMOS devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AFT09MP055NR1, the MRFE6VP6550HR5 offers extended frequency range and voltage capability but demands full circuit redesign, while the PD85003S trades output power and linearity for lower cost and simpler thermal management - neither is pin-compatible nor drop-in replaceable.

Availability

AFT09MP055NR1 is available at Aetrix Electronics and suitable for land mobile radio base stations, TETRA trunking transmitters, 800 MHz repeater systems, and SSB mobile amplifiers requiring stable component supply and long-lifecycle support.

Supply support for AFT09MP055NR1 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

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in RF power solutions, specializing in high-efficiency, high-ruggedness LDMOS transistors for wireless infrastructure and industrial applications.

The AFT09MP055NR1 belongs to Freescale's Airfast RF Power LDMOS family, engineered specifically for mobile two-way radio systems demanding high linearity, broadband performance, and field-proven reliability in harsh RF environments.

FAQ

What is the maximum continuous drain current rating for AFT09MP055NR1?

The AFT09MP055NR1 does not specify a maximum continuous drain current (ID) rating directly; instead, it defines maximum ratings by voltage and power. Total device dissipation is rated at 625 W at TC = 25°C, derating linearly at 3.13 W/°C above that temperature. Typical quiescent drain current is specified as IDQ(A+B) = 550 mA (narrowband) or 800 mA (broadband), reflecting its intended Class AB bias point - not absolute maximum current capability.

Does AFT09MP055NR1 require external input matching components?

No - the AFT09MP055NR1 incorporates an integrated input matching network, as confirmed in Freescale's technical data sheet features list and narrowband test circuit documentation. This eliminates discrete input capacitors and inductors in the 870 MHz narrowband reference design (Figure 5 and Table 6), reducing bill-of-materials count and layout sensitivity while improving broadband consistency across 764–870 MHz.

What is the thermal resistance junction-to-case (RθJC) value for AFT09MP055NR1?

The thermal resistance junction-to-case (RθJC) for AFT09MP055NR1 is 0.32 °C/W, measured under defined conditions: case temperature 78°C, 55 W CW output, 12.5 Vdc supply, IDQ(A+B) = 550 mA, and 870 MHz operation. This value is critical for heatsink sizing and confirms the device's suitability for high-power, thermally constrained mobile radio applications.

Can AFT09MP055NR1 be used in Class C amplifier configurations?

No - the AFT09MP055NR1 is characterized and optimized for Class AB operation only. Freescale's datasheet specifies quiescent bias points (IDQ = 550–800 mA), gain compression behavior, and linearity metrics exclusively for Class AB. Its gate threshold voltage (1.6–2.6 Vdc) and transconductance profile are not validated for Class C switching, and doing so risks exceeding safe operating area limits or degrading ruggedness performance.

Is AFT09MP055NR1 RoHS compliant and lead-free?

Yes - AFT09MP055NR1 meets RoHS Directive 2011/65/EU requirements. Its TO-270WB-4 gull-wing package uses lead-free matte tin plating on leads, and the device is rated for peak reflow temperatures up to 260°C (MSL Level 3 per J-STD-020), confirming full compatibility with lead-free PCB assembly processes.