4321M
Integrated 1-channel analog Class-D audio amplifier, 90W/4Ω or 135W/2Ω, PQFN-22 package.
Quick Answer: 4321M is commonly associated with Infineon / International Rectifier IR4321M, an integrated analog-input Class D audio amplifier in a compact PQFN-22 package.
- Manufacturer
- Infineon Technologies
- Product Category
- Full-Bridge & Half-Bridge (H-Bridge) Drivers
- Package
- QFN
- Stock
- 1,500 pcs
- Availability
- Current quantity subject to confirmation.
Product Attributes
| Manufacturer | Infineon Technologies |
|---|---|
| Product Category | Full-Bridge & Half-Bridge (H-Bridge) Drivers |
| Amplifier Type | Integrated Digital Audio Amplifier |
| Audio Input Type | Analog |
| Compliance | Lead-Free, Halogen-Free, RoHS Compliant |
| Device Marking | 4321M |
| Integrated Functions | PWM Controller, Gate Driver, Power MOSFETs |
| Low-Side Supply Voltage | 10 V to 15 V |
| Moisture Sensitivity Level | MSL 2 |
| Operating Qualification | Industrial |
| Output Power at 2Ω | 135 W typical |
| Output Power at 4Ω | 90 W typical |
| Package Size | 5 × 6 mm |
| Package Type | PQFN-22 |
| Positive Power Rail Voltage | 50 V max recommended for IR4321 |
| Product Type | Class-D Audio Amplifier IC |
| Protection Features | OCP, OTP, UVLO with self-reset |
| Residual Noise | 250 µVrms typical |
| Speaker Channels | 1 Channel |
| Supply Voltage | ±25 V or 50 V |
| Switching Frequency | Up to 500 kHz |
| THD+N | 0.02% typical at 1 kHz, 1 W, 4Ω |
| Topology | Half-Bridge / Full-Bridge |
| Datasheet | View Datasheet PDF |
Procurement Snapshot
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Detailed Description for 4321M
Product Overview
4321M is commonly associated with Infineon / International Rectifier IR4321M, an integrated analog-input Class D audio amplifier in a compact PQFN-22 package. The device integrates a PWM controller, high-voltage gate driver and low RDS(ON) MOSFET output stage to support high-power audio amplification with a small PCB footprint. With single-channel Class D operation, analog input support, split or single power supply operation and built-in protection features, it is suitable for active speakers, powered subwoofers, home audio systems, professional audio equipment, multimedia speakers and compact high-efficiency amplifier boards.
Key Features
Manufacturer: Infineon Technologies / International Rectifier legacy
Marking / Short Part Number: 4321M
Full / Related Part Number: IR4321M, IR4321MTRPBF and related Class D amplifier variants
Device Type: Integrated analog-input Class D audio amplifier
Product Category: Audio IC / Class D power amplifier
Audio Input Type: Analog input
Output Configuration: Single-channel Class D amplifier
Output Power: 90W to 135W class depending on load, supply voltage and distortion condition
Speaker Channel: 1 channel
Supply Type: Split or single power supply operation depending on circuit design
Supply Voltage: ±25V or 50V class operation depending on configuration
Integrated Function: PWM controller, high-voltage gate driver and MOSFET output stage integrated in one package
Output Stage: Integrated low RDS(ON) MOSFET output stage
Protection Feature: Overcurrent protection, overtemperature protection and undervoltage protection with reset behavior depending on datasheet version
Noise Feature: Start / stop click-noise reduction and high noise immunity depending on circuit design
Package Type: PQFN-22L 5mm x 6mm package
Mounting Type: Surface mount
Key Features: Analog input, single-channel Class D amplification, integrated controller / driver / MOSFET stage, compact PQFN package, high power density and protection functions
Typical Use: Active speakers, powered subwoofers, home audio systems, multimedia speakers, professional audio equipment and compact amplifier boards
Ordering / Packaging Note: 4321M is usually a shortened marking-style reference for IR4321M variants; buyers should verify the full Infineon ordering code, package suffix, output power condition, supply configuration, top marking, packing format and datasheet revision before production or repair use.
Applications
4321M can be used in electronic systems that require a compact high-efficiency Class D audio amplifier with analog input and integrated power stage. Typical applications include active loudspeakers, powered subwoofers, home theater systems, multimedia speakers, portable audio equipment, professional audio modules, amplifier boards, consumer electronics, maintenance projects and legacy audio amplifier repair. It is also suitable for BOM review where an Infineon / International Rectifier IR4321M family Class D amplifier IC is required.
Quality & Sourcing
Antrex Electronics can support 4321M sourcing with stock availability checks, RFQ quotation, package confirmation, date code review and shipment arrangement. For project-based purchasing, buyers can provide quantity, target price, required date code, packaging requirements and application information for faster quotation support.
For quality control, Antrex Electronics can help arrange product photos, label review, visual inspection and third-party testing support when required. OEMs, EMS providers, repair centers and electronic component buyers are welcome to send BOM lists or hard-to-find part requests for sourcing assistance.
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