Infineon Technologies IRLU9343PBF

Overview

IRLU9343PBF from Infineon Technologies (formerly International Rectifier) is a P-channel enhancement-mode MOSFET designed for high-efficiency Class-D audio amplifier output stages. It delivers 93 mΩ R_DS(on) at V_GS = −10 V, 31 nC total gate charge, and −55 V V_DS, enabling low conduction loss and minimized switching distortion in bridge-tied load (BTL) configurations.

For engineers reviewing the IRLU9343PBF datasheet, IRLU9343PBF pinout, IRLU9343PBF application, or IRLU9343PBF equivalent, key selection criteria include body-diode reverse recovery charge (Q_rr = 120–180 nC), low Q_gd/Q_gs ratio for EMI control, 175°C junction rating, repetitive avalanche capability, and D-Pak thermal performance (R_θJC = 1.9°C/W).

Technical Context

This MOSFET employs advanced trench-gate HEXFET® processing to optimize R_DS(on), Q_g, Q_sw, and Q_rr simultaneously-critical for minimizing THD and electromagnetic interference in high-frequency Class-D switching. Its −55 V breakdown voltage and −14 A continuous drain current (T_C = 25°C) support rail-to-rail operation in mid-power audio amplifiers up to ~100 W per channel.

The device integrates a fast, low-V_SD (−1.2 V typ.) body diode with 57–86 ns reverse recovery time and 120–180 nC Q_rr, enabling efficient synchronous rectification and reduced shoot-through risk during dead-time transitions in half-bridge topologies.

Key Specifications

Pinout & Package

IRLU9343PBF is housed in a surface-mount D-Pak (TO-252AA) package with exposed drain pad for enhanced thermal transfer. The package features three terminals: Gate (G), Drain (D), and Source (S), arranged in standard D-Pak footprint compatible with IPC-7351B.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar P-channel Class-D audio MOSFET applications.

Compared with IRLR9343PbF, the IRLU9343PBF offers superior thermal performance in surface-mount production; versus SiHP820EDJ-T1-GE3, it delivers lower Q_rr and proven reliability in mature Class-D platforms operating below 500 kHz.

Availability

IRLU9343PBF is available at Aetrix Electronics and suitable for home audio amplifiers, automotive infotainment systems, and portable Bluetooth speakers requiring stable component supply and long-term industrial availability.

Supply support for IRLU9343PBF 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

Infineon Technologies is a global semiconductor leader specializing in power management, sensor, and automotive ICs, with roots in International Rectifier's pioneering power MOSFET development.

The HEXFET® product line was engineered specifically for high-efficiency power conversion in audio, motor control, and industrial switching applications-emphasizing low R_DS(on), controlled switching behavior, and ruggedness under dynamic load conditions.

FAQ

What is the maximum safe continuous drain current for IRLU9343PBF at 100°C case temperature?

The maximum continuous drain current is −39 A at T_C = 100°C with V_GS = −10 V, derived from the absolute maximum ratings table and linear derating factor of 0.53 W/°C. This reflects thermal limits-not electrical limits-and assumes proper PCB copper area and heatsinking per the D-Pak thermal design guidelines.

Does IRLU9343PBF require a negative gate drive voltage to operate correctly?

Yes. As a P-channel MOSFET, IRLU9343PBF turns on when V_GS is negative relative to source. A V_GS of −10 V fully enhances the channel, while −4.5 V yields 150 mΩ R_DS(on). Gate drive must swing between source potential (0 V) and a negative rail (e.g., −12 V) or use level-shifting circuitry in half-bridge configurations.

Can IRLU9343PBF be used in synchronous rectification mode in a Class-D output stage?

Yes. Its low V_SD (−1.2 V typ.) and fast trr (57–86 ns) allow it to replace external Schottky diodes in synchronous rectifier configurations. However, precise gate timing relative to the complementary N-channel device is required to avoid shoot-through, and Q_rr-based losses must be modeled in thermal calculations.

Is the IRLU9343PBF pinout compatible with standard D-Pak footprints used for other IR devices?

Yes. IRLU9343PBF uses the industry-standard TO-252AA (D-Pak) outline with G–D–S terminal order matching IR's IRLR/IRFU series. The exposed drain pad aligns with IPC-7351B "DPAK" land pattern, and mechanical dimensions (6.73 × 6.22 mm body, 2.3 mm height) match JEDEC MS-012 specifications.