NXP Semiconductors MRF7S38010HR3

Overview

MRF7S38010HR3 from Freescale Semiconductor is an N-channel enhancement-mode lateral RF power MOSFET designed for WiMAX base station final-stage amplification in the 3400–3600 MHz band. It delivers 2 W average RF output power at 30 Vdc drain supply, achieves 15 dB power gain and −49 dBc ACPR (±5.25 MHz offset), and supports 64-QAM OFDM signals with 9.5 dB input PAR in 7 MHz channel bandwidth.

For engineers reviewing the MRF7S38010HR3 datasheet, MRF7S38010HR3 pinout, MRF7S38010HR3 application, or MRF7S38010HR3 equivalent, this device requires attention to gate bias stability under Class AB/C operation, thermal resistance (RθJC = 2.05 °C/W at 10 W CW), ESD robustness (HBM Class 1C), and series-equivalent impedance matching networks for broadband WiMAX spectral mask compliance.

Technical Context

This RF power transistor operates as a single-ended, internally matched amplifier stage optimized for OFDM multicarrier waveforms. Its lateral LDMOS structure enables high junction temperature tolerance (TJ = 225 °C) and stable performance across −30 °C to +85 °C ambient, with measured gain flatness of 1.04 dB over 200 MHz bandwidth and <1 dB intermodulation distortion variation across tone spacing from 100 kHz to 20 MHz.

The device uses series-equivalent large-signal impedance parameters (e.g., Zsource = 31.79 − j0.13 Ω at 3400 MHz; Zload = 13.92 − j11.33 Ω) for external matching network design. It sustains 10:1 VSWR at 32 Vdc and 3500 MHz without damage, and features integrated ESD protection per JESD22-A114 (HBM Class 1C), JESD22-A115 (MM Class A), and JESD22-C101 (CDM Class IV).

Key Specifications

Pinout & Package

Package: NI-400-240 (Case 465I-02, Style 1), ceramic/metal hermetic, flanged, 3-lead surface-mount package with drain-connected tab for thermal and RF grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MRF7S38010HSR3, the MRF7S38010HR3 offers superior thermal dissipation (2.05 vs. 2.24 °C/W) and proven 10:1 VSWR survival, making it preferred for deployed WiMAX base stations; versus MRFE6VP61K25H, it trades raw power for integrated matching and narrowband optimization essential for cost-sensitive 3.5 GHz fixed wireless access.

Availability

MRF7S38010HR3 is available at Aetrix Electronics and suitable for WiMAX base station manufacturing, WiBro infrastructure deployment, and BWA point-to-multipoint hub production requiring stable component supply and long-term lifecycle support.

Supply support for MRF7S38010HR3 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-frequency LDMOS transistors for wireless infrastructure.

The MRF7S38010HR3 belongs to Freescale's MRF7S family of laterally diffused MOSFETs engineered specifically for WiMAX, WiBro, and OFDM-based broadband wireless access systems operating near 3.5 GHz.

FAQ

What is the maximum continuous drain voltage rating for the MRF7S38010HR3?

The MRF7S38010HR3 has a maximum drain-source voltage rating of +65 Vdc, with a minimum of −0.5 Vdc. This rating is specified in Table 1 of the official Freescale datasheet (Document Number: MRF7S38010H, Rev. 0, Aug. 2007). Operation above +65 Vdc risks permanent device failure, and the −0.5 Vdc lower limit prevents reverse-bias breakdown during transient conditions. The MRF7S38010HR3 is typically operated at VDD = 30 Vdc in WiMAX applications.

Does the MRF7S38010HR3 require external matching components for 3400–3600 MHz operation?

No - the MRF7S38010HR3 is internally matched for 50 Ω operation across the 3400–3600 MHz band, as confirmed in Table 4 footnote and "Features" section of the datasheet. While the device ships with recommended test circuit values (e.g., ATC100B2R2JT500XT for C1), those are for characterization; production designs can simplify layout by leveraging the built-in matching, though fine-tuning may be needed for specific PA topology or harmonic suppression.

What is the gate threshold voltage range for the MRF7S38010HR3, and how does it affect bias design?

The MRF7S38010HR3 has a gate threshold voltage VGS(th) of 1.2–2.7 Vdc (min–max) at VDS = 10 Vdc and ID = 33.5 μAdc, per Table 4. This wide range necessitates adjustable gate bias circuits - typical quiescent gate voltage VGS(Q) is 2.0–3.5 Vdc at IDQ = 160 mA. Designers must implement temperature-compensated bias networks to maintain stable Class AB operation across −30 °C to +85 °C ambient, as gain drift is only 0.025 dB/°C but bias point shift impacts linearity.

Can the MRF7S38010HR3 be used in Class C mode, and what design considerations apply?

Yes - the MRF7S38010HR3 supports Class C operation due to its extended negative gate-source voltage range (−6.0 Vdc), explicitly cited as a feature for improved Class C performance. To implement Class C, bias must be set below VGS(th), typically −0.5 to −2.0 Vdc, with careful attention to gate drive swing and harmonic filtering. The device's greater negative VGS tolerance avoids gate leakage or punch-through, but output spectrum must be verified against regulatory masks since Class C increases harmonic content.

What thermal resistance value applies to the MRF7S38010HR3 under 10 W CW operation?

Under 10 W CW operation at case temperature TC = 80 °C, the MRF7S38010HR3 exhibits a thermal resistance RθJC of 2.05 °C/W, as specified in Table 2 of the datasheet. This value enables calculation of junction temperature rise: ΔTJ = 10 W × 2.05 °C/W = 20.5 °C above case temperature. With TC = 80 °C, TJ reaches 100.5 °C - well below the 225 °C absolute maximum, confirming safe continuous operation when properly heatsinked.