NXP Semiconductors MRFE6VP61K25GSR5

Overview

MRFE6VP61K25GSR5 from NXP Semiconductors (formerly Freescale) is a high-ruggedness, 50 V, 1250 W CW RF power LDMOS transistor optimized for broadband operation from 1.8 to 600 MHz. It delivers 27 dB gain and 84% drain efficiency at 81.36 MHz CW, supports unmatched input/output matching, and is qualified for industrial plasma exciters, FM broadcast transmitters, and aerospace HF/VHF amplifiers.

For engineers reviewing the MRFE6VP61K25GSR5 datasheet, MRFE6VP61K25GSR5 pinout, MRFE6VP61K25GSR5 application, or MRFE6VP61K25GSR5 equivalent, key selection criteria include its 225°C junction rating, >65:1 load mismatch tolerance at 230 MHz, dual-gate/dual-drain push-pull capability, and NI-1230GS-4L gull-wing package with backside source termination.

Technical Context

This device implements a laterally diffused MOSFET structure with integrated ESD protection, enabling robust Class C and linear operation under high VSWR conditions. Its series-equivalent large-signal impedance parameters are characterized across 1.8–600 MHz for both single-ended and push-pull configurations.

The MRFE6VP61K25GSR5 operates with gate threshold voltage of 1.7–2.7 V and forward transconductance of 28 S, supporting stable biasing from 30–50 VDD. Thermal resistance is 0.15 °C/W (CW) and 0.03 °C/W (pulse), validated at TC = 63–66 °C under full 1250 W output.

Key Specifications

Pinout & Package

MRFE6VP61K25GSR5 uses the NI-1230GS-4L gull-wing surface-mount package (13-inch reel, 50 units per reel). The backside metal serves as the common source terminal. Pin 1 = Gate A, Pin 2 = Gate B, Pin 3 = Drain A, Pin 4 = Drain B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRFE6VP61K25HSR5 and MRFE6VP61K25HR5, the MRFE6VP61K25GSR5 offers superior thermal conduction via gull-wing leads and optimized SMT manufacturability, making it the preferred choice for high-reliability, high-volume RF power amplifier production.

Availability

MRFE6VP61K25GSR5 is available at Aetrix Electronics and suitable for FM broadcast transmitters, industrial plasma exciters, and aerospace HF amplifiers requiring stable component supply and long-term lifecycle support.

Supply support for MRFE6VP61K25GSR5 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 in 2015 and continues to support its high-power RF portfolio with full documentation, modeling tools, and application engineering resources.

The MRFE6VP61K25GSR5 belongs to NXP's MRFE6V family of wideband LDMOS transistors, engineered specifically for high-ruggedness RF power amplification in broadcast, industrial, and defense systems operating up to 600 MHz.

FAQ

What is the maximum continuous drain current rating for MRFE6VP61K25GSR5?

The MRFE6VP61K25GSR5 does not specify a maximum continuous drain current (I_D) rating. Instead, its safe operating area is defined by maximum junction temperature (225°C), case temperature limit (150°C), and thermal resistance (0.15°C/W). At 1250 W CW output and 50 VDD, typical quiescent drain current is 100 mA - but peak pulsed current exceeds 100 A. Designers must use the provided Z_θJC and η_D data to calculate actual junction temperature under their specific bias and modulation conditions. The MRFE6VP61K25GSR5 datasheet provides MTTF calculators and thermal models for this purpose.

Does MRFE6VP61K25GSR5 require external gate protection diodes?

No, the MRFE6VP61K25GSR5 integrates ESD protection rated to 3500 V HBM, 250 V MM, and 4000 V CDM, eliminating the need for external gate protection diodes in standard PCB layouts. Its gate-source voltage rating is −6.0 V to +10 V DC, and the device tolerates brief negative gate excursions during Class C switching. However, in systems with long gate traces or high dv/dt coupling, local RC snubbing (e.g., 10 Ω + 100 pF) is recommended to suppress parasitic oscillation - not for ESD protection, but for RF stability. This guidance applies directly to the MRFE6VP61K25GSR5 and is confirmed in Freescale Application Note AN1955.

Can MRFE6VP61K25GSR5 be operated at 28 VDC instead of 50 VDC?

Yes, the MRFE6VP61K25GSR5 is characterized from 30 V to 50 VDD and can operate down to 28 VDC, though with reduced output power and efficiency. At 28 V, typical CW output drops to ~600 W at 230 MHz with ~65% efficiency. The gate threshold voltage (1.7–2.7 V) and quiescent gate voltage (1.9–2.9 V) remain valid, but bias networks must be recalculated to maintain IDQ = 100 mA. Derating curves in Figure 7 of the MRFE6VP61K25GSR5 datasheet confirm stable operation across this range. Operating below 30 V is not characterized and not recommended without full validation.

What is the recommended PCB copper thickness for the MRFE6VP61K25GSR5 thermal pad?

The MRFE6VP61K25GSR5 datasheet specifies a minimum 2 oz (70 µm) copper layer on the PCB thermal pad, with 3 oz (105 µm) strongly recommended for 1250 W CW operation. The backside source terminal requires direct thermal connection to an internal copper plane or external heatsink via soldered thermal vias (≥12×0.3 mm diameter, filled with thermal epoxy). Freescale's reference designs (e.g., Figure 13) use 0.030″ FR-4 with ε_r = 3.5 and 3 oz copper on the source layer. Using thinner copper risks exceeding the 150°C case temperature limit and voiding the 225°C junction rating - critical for reliable MRFE6VP61K25GSR5 deployment.

Is MRFE6VP61K25GSR5 pin-compatible with MRFE6VP61K25HR6?

No, MRFE6VP61K25GSR5 is not pin-compatible with MRFE6VP61K25HR6. While both share identical pin numbering (Gate A, Gate B, Drain A, Drain B), the MRFE6VP61K25HR6 uses the NI-1230H-4S straight-lead package, whereas MRFE6VP61K25GSR5 uses the NI-1230GS-4L gull-wing package with different lead pitch, coplanarity, and solder footprint. The land pattern, stencil design, and reflow profile differ significantly. Interchanging them without PCB redesign will cause solder joint fractures, thermal delamination, or open circuits. Always use the mechanical outline drawings (Document No. MRFE6VP61K25H Rev. 4.1, pp. 20–21) for MRFE6VP61K25GSR5-specific layout.