International Rectifier announced the expansion of its PowIRaudio family with the introduction of the single channel IR4321M and dual channel IR4322M integrated power modules. The 60V IR4321M and IR4322M complement the existing product offering and expand the power capability of low load-impedance Class D audio systems in applications including car audio systems, tabletop audio systems, active speakers and musical instruments (with integrated amplifiers).

The combination of an advanced audio controller IC with MOSFETs fully optimized for audio performance results in improved efficiency, THD, and EMI, allowing the IR432xM family to operate without a mechanical heatsink over a wide power supply range on either a single or split power supply. High voltage ratings and noise immunity ensure reliable operation over various environmental conditions.

Additional features common to the family include over-current protection, thermal shutdown, internal/external shutdown and floating differential input.

Two reference designs, the IRAUDAMP21 and IRAUDAMP22, featuring the IR4321M and IR4322M respectively are also available.

Datasheets and application notes are available on the International Rectifier website at
Availability and pricing

Pricing begins at US $1.71 for the IR4321 in 10,000-unit quantities. Production orders are available immediately. Prices are subject to change. The new devices are MSL2 industrial-qualified and RoHS compliant.

Module Specifications


Part Number

Number of Channels

Power Supply Voltage

Peak Output Power

(RMS per CH) with heatsink

Peak Output Power

(RMS per CH) without heatsink




60V or +/- 30V

135W (2Ω)

90W (2Ω)

PQFN 5x6mm



60V or +/- 30V

100W (2Ω)

50W (2Ω)

PQFN 7x7mm


Reference Designs


Reference Design

Featured Part


Output Power



IR4321 split power supply

135W*1ch 2Ω load



IR4322 split power supply

100W*2ch 2Ω load