NXP Semiconductors MRF7S19120NR1

Overview

MRF7S19120NR1 from Freescale Semiconductor is an N-channel enhancement-mode lateral RF power MOSFET designed for CDMA and W-CDMA base station final-stage amplification in the 1930–1990 MHz band. It delivers 36 W average output power at 28 V, achieves 18 dB power gain and 32% drain efficiency under single-carrier W-CDMA conditions, and supports digital predistortion correction in macrocell infrastructure transmitters.

For engineers reviewing the MRF7S19120NR1 datasheet, MRF7S19120NR1 pinout, MRF7S19120NR1 application, or MRF7S19120NR1 equivalent, key selection criteria include its 120 W CW P1dB compression point, 10:1 VSWR ruggedness at 32 V, 225°C junction rating, internally matched 50 Ω input/output design, and ESD protection rated to Class 2 HBM.

Technical Context

This LDMOS transistor operates in Class AB or Class C with gate threshold voltage of 1.2–2.7 V and quiescent gate voltage of 2.0–3.5 V at 1200 mA IDQ. Its large-signal impedance characteristics are characterized as series-equivalent Zsource (e.g., 1.922 – j1.623 Ω at 1960 MHz) and Zload (e.g., 1.887 – j0.089 Ω), enabling stable broadband matching across the 1930–1990 MHz band.

Thermal performance is defined by RθJC = 0.43 °C/W at 120 W CW (case temp 81°C), supporting high-reliability operation up to 225°C junction temperature. The device integrates ESD protection per JESD22-A114 (Class 2), JESD22-A115 (Class A), and JESD22-C101 (Class III), and complies with IPC/JEDEC J-STD-020 Level 3 moisture sensitivity.

Key Specifications

Pinout & Package

Package: TO-270 WBL-4 (Case 1730-02), plastic overmolded package with exposed thermal pad; RoHS compliant; supplied in 44 mm tape, 13-inch reel (R1 = 500 units).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF7S19120NR1, the MRFE6VP61K25H offers extended frequency coverage and higher power but demands more complex thermal management, while the QPD1025 provides GaN-level efficiency in a compact form factor but necessitates full circuit redesign-not just component substitution.

Availability

MRF7S19120NR1 is available at Aetrix Electronics and suitable for macrocell base station amplifiers, W-CDMA transmitter final stages, and CDMA2000 infrastructure requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for MRF7S19120NR1 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-reliability semiconductor devices for wireless infrastructure, automotive radar, and industrial RF heating.

The MRF7S19120NR1 belongs to Freescale's MRF7S family of laterally diffused MOSFETs, engineered specifically for high-efficiency, ruggedized 3G/4G base station power amplification with emphasis on thermal robustness and digital predistortion compatibility.

FAQ

What is the maximum continuous drain voltage rating for the MRF7S19120NR1?

The MRF7S19120NR1 has a maximum drain-source voltage (V_DSS) rating of +65 Vdc and –0.5 Vdc. This rating defines the absolute limit for safe DC biasing and transient voltage tolerance. Operation beyond this range risks irreversible breakdown. The device is typically operated at V_DD = 28 Vdc in standard W-CDMA applications, with short-term survivability up to 32 Vdc confirmed in VSWR stress testing.

Does the MRF7S19120NR1 require external input/output matching networks?

No, the MRF7S19120NR1 is internally matched for 50 Ω operation across 1930–1990 MHz, as confirmed in Table 1 and Figure 15 of the datasheet. While the reference test circuit (Figure 1) includes discrete matching components for optimization, the device itself integrates sufficient on-die impedance transformation to enable direct 50 Ω interfacing in many implementations-reducing bill-of-materials count and layout sensitivity.

What is the thermal resistance junction-to-case for the MRF7S19120NR1 at 120 W CW operation?

The thermal resistance junction-to-case (R_θJC) for the MRF7S19120NR1 is 0.43 °C/W when operating at 120 W CW with a case temperature of 81°C, per Table 2. This value is measured under controlled thermal test conditions and forms the basis for heatsink sizing calculations. At lower power levels (e.g., 36 W Avg), R_θJC increases to 0.51 °C/W due to non-uniform power dissipation profiles.

How is ESD protection implemented in the MRF7S19120NR1, and what standards does it meet?

The MRF7S19120NR1 integrates on-chip ESD protection structures validated to Human Body Model Class 2 (≥2 kV), Machine Model Class A (≥200 V), and Charge Device Model Class III (≥1000 V), per Tables 3 and 13. These ratings reflect actual qualification test results-not theoretical estimates-and ensure robustness during automated assembly, board handling, and field deployment in telecom infrastructure environments.

Can the MRF7S19120NR1 be used in Class C amplifier configurations?

Yes, the MRF7S19120NR1 supports Class C operation, enabled by its extended negative gate-source voltage range (V_GS down to –6.0 Vdc) and optimized transconductance profile. The datasheet explicitly states suitability for Class C in CDMA base station applications, and the "Greater Negative Gate–Source Voltage Range for Improved Class C Operation" is listed as a key feature-allowing deeper cutoff and higher efficiency in constant-envelope modulation schemes.