Infineon Technologies IRLR9343-701PBF

Overview

IRLR9343-701PBF from Infineon Technologies (formerly International Rectifier) is a P-channel enhancement-mode MOSFET optimized for Class-D audio amplifier output stages. It delivers 93 mΩ R_DS(on) at V_GS = −10 V, 31 nC total gate charge, and 175°C maximum junction temperature in an I-Pak (701) package with three terminals (Source, Drain, Gate). It enables high-efficiency switching in compact audio amplifiers.

For engineers reviewing the IRLR9343-701PBF datasheet, IRLR9343-701PBF pinout, IRLR9343-701PBF application, or IRLR9343-701PBF equivalent, key selection criteria include low Q_g/Q_sw for THD reduction, low Q_rr for EMI suppression, repetitive avalanche rating for robustness, and −55 V V_DS capability for rail-to-rail Class-D operation.

Technical Context

This MOSFET employs advanced trench-gate HEXFET® process technology to minimize conduction and switching losses simultaneously. Its body diode exhibits 120–180 nC reverse recovery charge and 57–86 ns trr under V_GS = −4.5 V, ID = −2.7 A conditions-critical for minimizing shoot-through and crossover distortion in half-bridge Class-D outputs.

The device features tightly controlled gate threshold voltage (−1.0 V typ., −3.7 mV/°C tempco) and low internal gate resistance, enabling stable turn-on/turn-off timing across temperature. Its 1.9°C/W junction-to-case thermal resistance supports high-power density mounting on copper-clad PCBs without external heatsinks in ≤15 W amplifier modules.

Key Specifications

Pinout & Package

IRLR9343-701PBF uses the I-Pak (701) surface-mount package: isolated tab (Drain), three gull-wing leads (Source, Drain, Gate), and thermally enhanced backside metal for direct PCB copper pour attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRLR9342PBF and Si7157DP-T1-GE3, the IRLR9343-701PBF uniquely balances low R_DS(on), moderate Q_g, and robust thermal performance in a thermally efficient I-Pak package-making it optimal for uncooled 10–20 W Class-D modules requiring production reliability.

Availability

IRLR9343-701PBF is available at Aetrix Electronics and suitable for home audio amplifiers, automotive infotainment systems, portable Bluetooth speakers, and professional audio mixers requiring stable component supply and long-term industrial availability.

Supply support for IRLR9343-701PBF 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 core expertise in silicon-based power devices and system-level solutions.

The IRLR9343-701PBF belongs to Infineon's HEXFET® Power MOSFET product line, engineered specifically for high-fidelity, high-efficiency switching in audio power stages where low distortion, thermal resilience, and avalanche ruggedness are mandatory.

FAQ

What is the maximum continuous drain current for IRLR9343-701PBF at 100°C case temperature?

The maximum continuous drain current is −20 A at T_C = 100°C with V_GS = −10 V, as specified in the Absolute Maximum Ratings table. This rating assumes proper PCB copper area (≥1 in² 2 oz Cu) for thermal conduction and accounts for R_DS(on) increase with temperature. Derating below −20 A is required if ambient exceeds 60°C or airflow is restricted.

Does IRLR9343-701PBF require a gate resistor for stability in Class-D operation?

Yes-a 2.2–4.7 Ω non-inductive gate resistor is recommended between driver output and Gate pin to suppress oscillation caused by interaction between 7.5 nH internal source inductance and gate capacitance. Without it, ringing exceeding 200 MHz may induce false triggering or increased EMI, especially at switching frequencies above 350 kHz.

Can IRLR9343-701PBF be used in synchronous rectification applications?

No-it is not optimized for synchronous rectification. Its body diode has relatively high V_SD (−1.2 V max) and Q_rr (120–180 nC), resulting in higher conduction and recovery losses than dedicated SR MOSFETs. Use only in Class-D output switching where body diode conduction is brief and controlled by complementary topology.

Is the I-Pak (701) package of IRLR9343-701PBF RoHS-compliant and lead-free?

Yes-the "PBF" suffix confirms compliance with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 marking. The device uses matte tin-plated leads and lead-free die attach; no lead content is present in solderable surfaces or internal metallization, and it meets IPC-J-STD-020D moisture sensitivity level 1.