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Infineon Technologies IRLR9343PBF
- Part No.:
- IRLR9343PBF
- Manufacturer:
- Infineon Technologies
- Category:
- FETs, MOSFETs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
IRLR9343PBF.pdf
- Description:
- MOSFET P-CH 55V 20A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:8,877
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Product details
Overview
IRLR9343PBF 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 RDS(on) at VGS = −10 V, 31 nC total gate charge, and 175°C maximum junction temperature in D-Pak (TO-252) package. Its low Qrr (120–180 nC) and fast body diode recovery (trr = 57–86 ns) directly improve THD and EMI performance in high-frequency switching audio outputs.
For engineers reviewing the IRLR9343PBF datasheet, IRLR9343PBF pinout, IRLR9343PBF application, or IRLR9343PBF equivalent, key selection criteria include its −55 V VDS, repetitive avalanche capability, low Qg/Qsw trade-off for efficiency vs. switching speed, and thermal robustness in compact PCB-mounted audio power stages.
Technical Context
This MOSFET employs advanced trench-gate HEXFET® process technology to minimize conduction and switching losses simultaneously. Its gate charge profile (Qgd = 8.5 nC, Qgs = 7.1 nC) and low internal gate resistance enable precise control of turn-on/turn-off timing critical for minimizing shoot-through in half-bridge Class-D outputs.
The device integrates a co-packaged body diode with optimized reverse recovery (Qrr = 120–180 nC, trr = 57–86 ns) and forward voltage (VSD ≤ −1.2 V), reducing dead-time sensitivity and improving zero-crossing fidelity in PWM-driven audio amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | −55 V - Withstands rail voltages up to ±28 V in bridged Class-D topologies with margin |
| RDS(on) @ VGS = −10 V | 93 mΩ typ. - Enables <1 W conduction loss at 3.4 A RMS output current |
| Qg total | 31 nC typ. - Supports efficient gate drive with standard ±12 V controllers at >300 kHz switching |
| trr | 57–86 ns - Limits diode-induced distortion during high-dV/dt transitions in audio band |
| TJ max | 175°C - Allows sustained operation under thermal stress in sealed enclosures |
| EAS | 400 mJ single-pulse - Absorbs inductive energy from speaker load transients without failure |
| Ciss | 660 pF - Determines Miller effect magnitude and gate driver current demand |
Pinout & Package
IRLR9343PBF uses the D-Pak (TO-252) surface-mount package with exposed drain pad for thermal conduction. The package measures 6.7 mm × 6.2 mm × 2.4 mm and is lead-free per RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Source) | Source terminal (S) | Common return path for load current; connects to ground or negative rail in high-side switch configuration |
| Pin 2 (Gate) | Control input (G) | Receives PWM signal; requires ≥10 V negative swing relative to source to fully enhance |
| Pin 3 (Drain) | Power output (D) | Connects to speaker load or half-bridge node; thermally coupled to PCB copper via exposed pad |
Key Features
| Feature | Design Value |
|---|---|
| Optimized Qg/Qsw ratio | Enables simultaneous THD reduction and efficiency gain in 200–500 kHz Class-D switching |
| Low Qrr body diode | Reduces reverse recovery noise injection into analog signal paths during dead-time intervals |
| 175°C rated junction | Supports continuous operation in ambient temperatures up to 85°C with standard 2 oz copper PCB cooling |
| Repetitive avalanche rating | Withstands repeated inductive kickback from 4 Ω speaker loads without derating or snubbing |
Applications
| Class-D Audio Amplifier Output Stage | DC-DC Synchronous Buck Converter High-Side Switch |
|---|---|
Use Scenario: Final output stage in 10–100 W mono or stereo Class-D amplifier driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: Low-side switch in half-bridge topology; commutates at 300–500 kHz with precise dead-time control. Use Value: 93 mΩ RDS(on) and 31 nC Qg reduce total power loss to <1.2 W at 3.4 A RMS, enabling passive heatsink-free design. | Use Scenario: High-side synchronous rectifier in isolated 12 V → 5 V/3.3 V buck converter for audio SoC power rails. IC Role / Device Role / Timing Role: P-channel high-side switch controlled by complementary gate driver; operates with 100 ns dead time. Use Value: −55 V rating and 175°C TJ allow safe operation during 15 V input surges and transient overloads. |
| Automotive Infotainment Power Stage | Portable Bluetooth Speaker Power Module |
Use Scenario: Dual-channel Class-D amplifier in automotive head unit powering front/rear speakers. IC Role / Device Role / Timing Role: Output MOSFET in dual half-bridge configuration; handles ISO 7637-2 load dump transients. Use Value: Repetitive avalanche capability (EAR = 100 mJ at 1% duty) eliminates need for external TVS clamping on speaker lines. | Use Scenario: Battery-powered 2×15 W Class-D amplifier in compact Bluetooth speaker enclosure. IC Role / Device Role / Timing Role: Low-RDS(on) output switch enabling >85% efficiency at 7.4 V Li-ion input. Use Value: 150 mΩ RDS(on) @ −4.5 V allows full enhancement from single-supply gate drivers, simplifying PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar P-channel MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRLR9342PBF | RDS(on) = 110 mΩ @ −10 V; Qg = 25 nC; lower conduction loss penalty but reduced current handling | Suitable for ≤20 W audio outputs where gate drive strength is limited | Select when prioritizing lower gate charge over absolute RDS(on) in space-constrained designs |
| SI4435DY-T1-GE3 | RDS(on) = 100 mΩ @ −4.5 V; SO-8 package; no exposed drain pad; Qrr = 150 nC | Better for low-voltage logic-level drive but lacks thermal performance for >50°C ambient | Choose for cost-sensitive consumer audio where PCB area is less constrained than thermal budget |
Compared with IRLR9342PBF and SI4435DY-T1-GE3, the IRLR9343PBF offers superior thermal robustness (175°C TJ + exposed D-Pak pad) and tighter Qrr/trr specs-critical for THD-sensitive audio outputs-while maintaining competitive gate drive compatibility.
Availability
IRLR9343PBF is available at Aetrix Electronics and suitable for Class-D audio amplifier output stages, automotive infotainment power modules, and portable speaker battery-powered systems requiring stable component supply and long-term manufacturability.
Supply support for IRLR9343PBF 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 acquired International Rectifier in 2015 and continues its legacy of high-performance power semiconductors for industrial, automotive, and consumer applications.
This device belongs to the HEXFET® Digital Audio MOSFET product line, engineered specifically to balance low RDS(on), minimized gate/diode charge, and rugged thermal/avalanche performance for high-fidelity switching audio amplification.
FAQ
What is the recommended gate resistor value for IRLR9343PBF in a 350 kHz Class-D amplifier?
A 10 Ω series gate resistor is recommended to dampen ringing while maintaining <20 ns rise/fall times. This value balances EMI suppression against switching loss increase, as confirmed by IR's AN-1001 application note using 2.5 Ω internal gate resistance and 660 pF Ciss.
Does IRLR9343PBF require a heatsink in a 2-layer PCB design?
No heatsink is required if the D-Pak drain pad is soldered to ≥1 in² of 2 oz copper with thermal vias. At 3.4 A continuous drain current and 25°C ambient, junction temperature remains below 110°C per RθJC = 1.9°C/W and RθJA = 50°C/W data.
Can IRLR9343PBF be used in synchronous rectification for 5 V output converters?
Yes-it supports VGS = −4.5 V logic-level drive with 150 mΩ RDS(on), making it suitable for 5 V output buck converters where gate drive is derived from the same rail. Body diode VSD ≤ −1.2 V ensures low forward drop during startup or light load.
How does the repetitive avalanche rating impact reliability in speaker protection circuits?
The 100 mJ repetitive avalanche energy at 1% duty cycle enables reliable handling of speaker cable short-circuit transients without external clamping. This eliminates failure modes from inductive kickback during fault conditions, as validated in IR's AN-1005 test methodology.
IRLR9343PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- HEXFET®
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- FET Type:
- P-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 55 V
- Current - Continuous Drain (Id) @ 25°C:
- 20A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 105mOhm @ 3.4A, 10V
- Vgs(th) (Max) @ Id:
- 1V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 47 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 660 pF @ 50 V
- FET Feature:
- -
- Power Dissipation (Max):
- 79W (Tc)
- Operating Temperature:
- -40°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252AA (DPAK)
IRLR9343PBF FAQ
1.How can I place an order for IRLR9343PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRLR9343PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IRLR9343PBF reliable?
The price and inventory of IRLR9343PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRLR9343PBF is usually 5 days.
3.What payment methods are accepted for IRLR9343PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRLR9343PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRLR9343PBF?
IRLR9343PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRLR9343PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IRLR9343PBF?
For technical support, including IRLR9343PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRLR9343PBF requirements.
6.How does Aetrix verify that IRLR9343PBF is sourced from the original manufacturer or authorized distributors?
All IRLR9343PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRLR9343PBF meets industry standards.
7.What is the process for return or replacement of IRLR9343PBF?
All IRLR9343PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRLR9343PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IRLR9343PBF part is unused and in its original packaging.
Return procedure for IRLR9343PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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