NXP Semiconductors A5G35S004N-3400

Overview

A5G35S004N from NXP Semiconductors is a GaN-on-SiC RF power transistor designed for 5G massive MIMO active antenna systems in the 3300–4300 MHz band, delivering 24.5 dBm average output power at 3400 MHz with 19.3 dB power gain and 19.5% drain efficiency under W-CDMA modulation.

For engineers reviewing the A5G35S004N datasheet, A5G35S004N pinout, A5G35S004N application, or A5G35S004N equivalent, this device requires attention to gate bias sequencing (depletion-mode operation), thermal management (RθJC = 8.9 °C/W), and broadband impedance matching for linearization in 5G base station PA stages.

Technical Context

This DFN-packaged GaN HEMT operates as a depletion-mode transistor requiring negative VGS bias (–2.53 V typical quiescent) and positive VDD (48 Vdc). Its design targets wideband linearity in 5G NR TDD bands, with verified ruggedness across 400 MHz instantaneous bandwidth at 55 Vdc and 0.58 W modulated output.

The device integrates high terminal impedances to simplify external matching networks and supports universal broadband driver architectures. It is internally unmatched, enabling flexible integration into Doherty or envelope-tracking PA topologies optimized for PAR handling up to 9.9 dB.

Key Specifications

Pinout & Package

Package: DFN 4.5 × 4 mm with exposed source pad on backside. Thermal path optimized via soldered case-to-PCB interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with QPD1025 and A5G35S003N, the A5G35S004N uniquely balances 3400–4300 MHz coverage, 19.5 dB gain at 3400 MHz, and 8.9 °C/W thermal resistance in a compact DFN - making it the optimal choice for next-generation 5G AAUs requiring full n77/n78 support without thermal derating.

Availability

A5G35S004N is available at Aetrix Electronics and suitable for 5G massive MIMO active antenna units, macro base station power amplifiers, and private network small cells requiring stable component supply, long-term lifecycle support, and traceable GaN sourcing.

Supply support for A5G35S004N 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 is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and communications markets, with deep expertise in RF power technologies.

The A5G35S004N belongs to NXP's Airfast family of GaN transistors engineered specifically for energy-efficient, broadband 5G infrastructure - emphasizing linearity, ruggedness, and thermal performance in active antenna systems.

FAQ

What is the correct biasing sequence for the A5G35S004N?

The A5G35S004N is a depletion-mode GaN transistor requiring strict bias sequencing: first apply –5 V to VGS, then ramp VDS to +48 Vdc, then adjust VGS to –2.53 V (typical) to set 12 mA IDQ, and finally apply RF input. Reversing this risks catastrophic failure due to uncontrolled current surge. The A5G35S004N datasheet specifies this sequence explicitly in Section "Correct biasing sequence for GaN depletion mode transistors".

Does the A5G35S004N require external matching networks?

Yes, the A5G35S004N is an internally unmatched GaN transistor, meaning all RF input and output matching must be implemented externally using discrete components or microstrip lines. Its high terminal impedances simplify broadband matching - validated in NXP's reference circuit (Figure 3) using ATC and Murata components. No integrated matching is present in the A5G35S004N die or package.

What thermal interface materials are recommended for the A5G35S004N?

NXP recommends solder attachment (not thermal paste or tape) for the A5G35S004N's exposed source pad to maximize thermal conduction. AN1907 specifies reflow profile details: peak temperature 260 °C (MSL Level 3), with solder mask opening per Figure 6 and thermal vias under the pad. The A5G35S004N achieves RθJC = 8.9 °C/W only when soldered per these guidelines - thermal paste yields >3× higher resistance.

Can the A5G35S004N operate at 55 Vdc supply voltage?

Yes, the A5G35S004N is rated for VDD up to 55 Vdc (Table 7), and its wideband ruggedness test (Table 14) was performed at 55 Vdc with 0.58 W modulated output. However, recommended operating conditions specify 48 Vdc for optimal linearity and reliability. Operating the A5G35S004N continuously at 55 Vdc increases channel temperature and may accelerate wear-out unless thermal design compensates - consult MTTF equation in Table 8.

Is the A5G35S004N pin-compatible with other Airfast GaN transistors?

No, the A5G35S004N uses a unique 6-pin DFN layout (Figure 1) with dual VDS pins and three NC terminals - it is not pin-compatible with A5G35S003N (same package outline but different pin function mapping) or QPD1025 (7 × 6 mm PQFN). PCB redesign is required when substituting the A5G35S004N, even within the Airfast family.