NXP Semiconductors A3G22H400-04SR3

Overview

A3G22H400-04SR3 from NXP Semiconductors is a 79 W asymmetrical Doherty RF power GaN transistor designed for cellular base station power amplifiers operating in the 1800–2200 MHz band. It delivers 15.4 dB typical power gain, 56.6% drain efficiency, and –34.9 dBc ACPR at 2140 MHz under W-CDMA single-carrier conditions with 9.9 dB PAR input.

For engineers reviewing the A3G22H400-04SR3 datasheet, A3G22H400-04SR3 pinout, A3G22H400-04SR3 application, or A3G22H400-04SR3 equivalent, key selection criteria include guaranteed 1800–2200 MHz Doherty performance, 48 V operation, high VSWR tolerance, thermal resistance of 0.87 °C/W (IR), and NI-780S-4L package compatibility with heatsink mounting.

Technical Context

The A3G22H400-04SR3 implements an internally matched asymmetrical Doherty architecture with separate carrier and peaking transistors on a single GaN die. It operates with fixed gate biasing (V_GSA(Q) = –3.0 Vdc, V_GSB = –5.4 Vdc) and requires strict bias sequencing per NXP's GaN depletion-mode protocol to prevent damage.

Characterized in 50 Ω test fixtures with soldered heatsink attachment, its performance is validated across 1805–2200 MHz using W-CDMA single-carrier signals at 79 W average output. Key metrics include 0.05 dB gain flatness over 90 MHz bandwidth and –15° AM/PM distortion at P3dB compression point.

Key Specifications

Pinout & Package

The A3G22H400-04SR3 is housed in the NI-780S-4L air-cavity ceramic package, designed for high-power RF applications with direct heatsink mounting and low thermal resistance. The package features four leads arranged in a symmetrical quad configuration with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A3G22H400-04S (identical die, different packaging) and AFGA32000 (lower ACPR, reduced efficiency), the A3G22H400-04SR3 offers the highest verified linearity and thermal performance in the 1800–2200 MHz Doherty segment, making it optimal for carrier-grade macro base stations requiring full 3GPP compliance.

Availability

A3G22H400-04SR3 is available at Aetrix Electronics and suitable for macro cellular base stations, 5G mMIMO active antenna units, and private LTE infrastructure requiring stable component supply, long-term lifecycle support, and traceable GaN transistor sourcing.

Supply support for A3G22H400-04SR3 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 A3G22H400-04SR3 belongs to NXP's AIRFAST® GaN RF power transistor family, engineered specifically for high-efficiency, high-linearity cellular infrastructure amplifiers operating in licensed sub-3 GHz bands.

FAQ

What is the recommended gate bias sequence for safe operation of the A3G22H400-04SR3?

The A3G22H400-04SR3 requires strict adherence to NXP's GaN depletion-mode bias sequencing to prevent catastrophic failure. To turn ON: first set V_GSA and V_GSB to –5 Vdc, then apply 48 Vdc to V_DSA and V_DSB, adjust gate voltages to achieve 200 mA carrier quiescent current, and finally apply RF input. To turn OFF: remove RF, reduce gates to –5 Vdc, ramp down drains to 0 V, then disable gate bias. This sequence is mandatory for every power cycle of the A3G22H400-04SR3.

Does the A3G22H400-04SR3 require external input/output matching networks?

No, the A3G22H400-04SR3 is internally matched for operation across the full 1800–2200 MHz band in a 50 Ω system. NXP characterizes and guarantees all RF performance metrics-including gain, efficiency, and ACPR-using only the specified production test fixture without added matching components. External networks are unnecessary for baseline operation of the A3G22H400-04SR3, though optional fine-tuning may be applied for narrowband optimization.

What thermal interface material and mounting method are recommended for the A3G22H400-04SR3?

NXP specifies solder reflow attachment for the A3G22H400-04SR3's NI-780S-4L package directly to a copper heatsink, per Application Note AN1908. Thermal interface materials are not used; instead, a controlled reflow profile bonds the package's thermal pad to the heatsink with high-conductivity solder. This method achieves the published 0.87 °C/W R_θJC and is required to maintain reliability and performance of the A3G22H400-04SR3 under continuous 79 W average load.

Can the A3G22H400-04SR3 be used outside the 1800–2200 MHz band?

No-NXP explicitly states that performance of the A3G22H400-04SR3 is characterized and guaranteed only within the 1800–2200 MHz frequency band. Operation outside this range is neither tested nor supported; no specifications (gain, efficiency, ACPR, or VSWR tolerance) are provided for frequencies below 1800 MHz or above 2200 MHz. Using the A3G22H400-04SR3 outside its rated band violates the datasheet conditions and voids performance guarantees.

What is the maximum allowable junction temperature for continuous operation of the A3G22H400-04SR3?

The A3G22H400-04SR3 is rated for continuous operation with junction temperature (T_J) up to +225 °C, as defined in Table 1 of the datasheet. While the absolute maximum junction temperature is 275 °C, sustained operation above 225 °C significantly reduces median time to failure and is not recommended. Thermal design must ensure T_J remains ≤225 °C under worst-case RF and thermal conditions to maintain reliability and performance of the A3G22H400-04SR3.