NXP Semiconductors MRFE6S9125NR1

Overview

MRFE6S9125NR1 from NXP Semiconductors (formerly Freescale) is an N-channel enhancement-mode lateral RF power MOSFET designed for broadband base station amplifier stages operating up to 1000 MHz. It delivers 27 W average output power at 880 MHz under N-CDMA modulation, achieves 20.2 dB power gain and 31% drain efficiency at 28 V, and supports rugged 10:1 VSWR operation - ideal for commercial wireless infrastructure final-stage PAs.

For engineers reviewing the MRFE6S9125NR1 datasheet, MRFE6S9125NR1 pinout, MRFE6S9125NR1 application, or MRFE6S9125NR1 equivalent, key selection criteria include its 225°C junction rating, internally matched 50 Ω input/output impedance, ESD protection class 1B (HBM), TO-270 WB-4 plastic package, and verified performance in N-CDMA, GSM EDGE, and CW applications up to 125 W PEP.

Technical Context

This device operates as a common-source RF power amplifier with fixed gate bias (V_GS(Q) = 2.86 V typical at I_DQ = 950 mA), optimized for 28 V DC supply and broadband matching across 865–960 MHz. Its lateral LDMOS structure enables high ruggedness, low thermal resistance (R_θJC = 0.44 °C/W), and stable gain flatness (0.93 dB over 35 MHz bandwidth).

Internally matched design eliminates external input matching networks; large-signal series-equivalent impedances are characterized (e.g., Z_source = 1.73 + j0.04 Ω, Z_load = 0.57 − j2.42 Ω at 880 MHz), enabling direct integration into 50 Ω systems. Thermal derating is defined up to T_C = 150°C case temperature and T_J = 225°C junction limit.

Key Specifications

Pinout & Package

MRFE6S9125NR1 uses the TO-270 WB-4 plastic package (Case 1486-03, Style 1), featuring four terminals: Drain (tab), Source (pin 1), Gate (pin 2), and second Source (pin 3). The metal tab is electrically connected to the Drain and serves as primary thermal path and RF ground reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRFE6S9125NR1, MRF6S9125NR1 offers equivalent RF performance but requires mechanical redesign for TO-272 mounting, while MRFE6S9125NBR1 provides identical functionality with smaller reel size - making it suitable for low-volume prototyping or space-constrained SMT feeders.

Availability

MRFE6S9125NR1 is available at Aetrix Electronics and suitable for commercial wireless infrastructure, macro base station amplifiers, and broadband RF power amplifier designs requiring stable component supply, long lifecycle support, and RoHS-compliant manufacturing.

Supply support for MRFE6S9125NR1 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 acquired Freescale Semiconductor in 2015 and continues to support its RF power portfolio. NXP is a global leader in high-performance analog and RF solutions for automotive, industrial, and communications markets.

The MRFE6S9125NR1 belongs to NXP's LDMOS RF power transistor family, engineered specifically for high-efficiency, high-ruggedness base station amplifiers operating in the 700–1000 MHz spectrum bands used by 2G/3G cellular infrastructure.

FAQ

What is the maximum continuous drain voltage rating for MRFE6S9125NR1?

The MRFE6S9125NR1 has a maximum drain-source voltage (V_DSS) rating of +66 Vdc and −0.5 Vdc. Its maximum operating voltage (V_DD) is specified as +32 Vdc with 0 V minimum, meaning it is rated for continuous 28 V operation and transient overvoltage up to 32 V - critical for surviving lightning-induced surges in outdoor base station installations. This rating is validated per Table 1 in the Freescale MRFE6S9125N datasheet Rev. 0 (Oct. 2007).

Does MRFE6S9125NR1 require external input matching networks?

No, MRFE6S9125NR1 is internally input-matched for 50 Ω systems across its operational band (865–960 MHz), as confirmed in Table 5 footnote "Part is internally input matched" and Figure 16 impedance data. This eliminates discrete input matching components in standard designs, though external tuning may be applied for narrowband optimization. The device's characterized Z_source values (e.g., 1.73 + j0.04 Ω @ 880 MHz) enable precise custom network design when needed.

What is the thermal resistance from junction to case for MRFE6S9125NR1?

The MRFE6S9125NR1 has a thermal resistance (R_θJC) of 0.44 °C/W when operated at 125 W CW with case temperature maintained at 80°C, as specified in Table 2. This value is measured per AN1955 methodology and reflects the device's ability to transfer heat efficiently from silicon junction to the TO-270 WB-4 metal tab - a key parameter for heatsink sizing in macro base station PA modules.

Can MRFE6S9125NR1 be used in GSM EDGE applications?

Yes, MRFE6S9125NR1 is qualified for GSM EDGE with verified performance: at 28 V, 700 mA I_DQ, it delivers 60 W avg. output, 20 dB power gain, 40% drain efficiency, −63 dBc spectral regrowth at 400 kHz offset, and 1.8% rms EVM across 920–960 MHz. These results are documented in Table 5 and Figure 3–4 of the official datasheet, confirming suitability for EDGE linear amplification without DPD in many implementations.

What does the "R1" suffix indicate in MRFE6S9125NR1?

The "R1" suffix in MRFE6S9125NR1 denotes tape-and-reel packaging: 500 units per 44 mm wide, 13-inch diameter reel, as explicitly stated in the Features section. This distinguishes it from MRFE6S9125NBR1 (250 units/reel) and non-R variants (bulk or tray). The R1 format ensures compatibility with high-speed SMT placement equipment and supports automated manufacturing of RF power amplifier assemblies.