IR4301MTRPBF - 160W Mono Class D Audio Amplifier | Infineon
MPN: IR4301MTRPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.51 | $4.51 |
| 10 | $4.05 | $40.50 |
| 100 | $3.58 | $358.00 |
| 500 | $3.15 | $1,575.00 |
| 1,000 | $2.78 | $2,780.00 |
IR4301MTRPBF Overview
A Class D audio amplifier is a switching amplifier topology that drives the loudspeaker with pulse-width modulated square waves at hundreds of kHz, then low-passes them in the speaker itself. The IR43x1 family therefore belongs to the audio amplifier IC class of products, which itself sits inside the broader amplifier IC and integrated circuit hierarchy. Compared with classic linear (Class AB) amplifiers, Class D designs reach efficiencies above 90 percent, which lets the IR4301M deliver high peak music power without a mechanical heatsink in typical music playback use.
Key features include integrated analog input with no MCU code required, high peak music power output, no mechanical heatsink requirement, split or single supply operation, and differential or single-ended input. Integrated protections cover over-current, over-temperature, and under-voltage conditions. The 5 mm by 6 mm PQFN22 footprint exposes the die to a thermal pad that conducts waste heat to the PCB copper, which is the primary cooling path in compact audio products.
The IR4301M multichip module uses an optimized co-packed MOSFET pair driven by a dedicated controller, so the gate drive and dead time are matched to the output stage. High voltage ratings and noise immunity in the controller IC ensure reliable operation over a wide range of environmental conditions. The amplifier is specified for industrial temperature grade and supports both bridge-tied-load and single-ended output configurations through the same pinout.
Typical applications include soundbars, subwoofers, mini-component stereo systems, portable Bluetooth speakers, and integrated active speaker modules. The device is also used in automotive aftermarket amplifiers and pro-sumer desktop audio. Designers choose this part when they need a small, thermally friendly mono Class D stage that can be driven directly from an analog audio source.
When designing with the IR4301M, place the LC output filter components close to the device and provide a substantial copper pour on the exposed pad to dissipate the idle losses. The datasheet recommends a ferrite-core inductor around 10 to 22 uH and an X7R film or ceramic filter capacitor matched to the load impedance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone. The IR43x1 family covers the IR4301M, IR4311M, and IR4321M, which differ mainly in output power and supply voltage rating.
Drop-in alternatives for IR4301MTRPBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
IR4311MTRPBF
β Drop-Inπ Reference alternative (not in catalog)
IR4321MTRPBF
β Drop-Inπ Reference alternative (not in catalog)
IR4301MTRPBF
β Drop-Inβ In Stock
$2.78 / Unit
View Datasheet βIR4301MTRPBF Maximum Ratings & Electrical Characteristics
| Output Type | 1-Channel (Mono) Class D |
| Maximum Output Power | 160 W into 4 ohm |
| Load Impedance | 4 ohm minimum |
| Output Noise | 250 uVrms |
| Input Type | Analog, differential or single-ended |
| Power Supply | Split or single supply |
| Integrated Stage | PWM controller + gate driver + 2 low-RDS(on) MOSFETs |
| Package | 22-PowerVQFN (5 x 6 mm) |
| Heatsink Required | No (in typical music playback usage) |
| Protection Features | Over-current, over-temperature, under-voltage |
| Operating Temperature Grade | Industrial |
| Mounting Type | Surface Mount |
| Lead Free / RoHS | Yes, lead-free finish (PBF suffix) |
| Output Filter | External LC required (per datasheet typical application) |
IR4301MTRPBF 22-powervqfn (5 x 6 mm) Pin Configuration Guide
Pin configuration for IR4301MTRPBF (22-powervqfn (5 x 6 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for IR4301MTRPBF.
Refer to the datasheet for full pin configuration.
Typical Applications
IR4301MTRPBF is suitable for 6 applications: Mono Subwoofer Amplifier, Soundbar Power Stage, Portable Bluetooth Speaker, Active Desktop Monitor, Automotive Aftermarket Amplifier, Mini Component Stereo System.
Mono Subwoofer Amplifier
The IR4301MTRPBF fits a powered subwoofer because it delivers 160 W into 4 ohm from a 5x6 mm PowerVQFN22 with no mechanical heatsink. With 250 uVrms output noise and >90 percent Class D efficiency, the stage produces enough clean low-frequency headroom for an 8 or 10 inch driver in a sealed or ported enclosure. Place the device near the speaker terminal block, route the analog input from the preamp board through a twisted pair, and use a 10 to 22 uH ferrite-core output inductor with an X7R filter cap matched to 4 ohm. The integrated OCP/OTP/UVP protection lets the amp survive a shorted speaker cable or a thermal overload without external circuitry.
Recommended
Soundbar Power Stage
In a 2.1 or 3.1 soundbar, one IR4301MTRPBF per channel provides 160 W mono in a footprint that lets three or four channels fit on a single compact PCB. The integrated analog input accepts line-level signals from the TV or HDMI-ARC receiver, removing the need for a separate DSP. Because efficiency is above 90 percent, the soundbar enclosure can be sealed without vent holes or heatsink fins. The 250 uVrms noise floor preserves dialog clarity, and the OCP/OTP/UVP protection handles the thermal stress of sustained high-volume movie playback in a closed cabinet.
Recommended
Portable Bluetooth Speaker
The IR4301MTRPBF suits a portable Bluetooth speaker because it runs from a single supply rail, accepts analog audio from the Bluetooth SoC DAC, and delivers enough power for outdoor listening. The 5x6 mm PowerVQFN22 footprint leaves room for a 2S or 3S lithium battery pack and a passive radiator in a small IPX enclosure. High Class D efficiency extends battery life by 2x to 3x compared with a Class AB amp of the same output, and the no-heatsink design lets the enclosure remain sealed. The integrated OTP shuts the amp down before the lithium cells reach a damaging temperature, adding a second layer of safety.
Recommended
Active Desktop Monitor
A pair of active desktop monitors can use one IR4301MTRPBF per speaker, with each amp delivering 160 W mono to the woofer or full-range driver. The analog input accepts balanced or unbalanced signal from a DAC or audio interface, and the 250 uVrms noise floor keeps the noise well below the DAC's own output. The exposed thermal pad conducts heat to the rear-panel aluminum heatsink, doubling the cooling budget without adding a fan. The IR4301MTRPBF is pin-compatible with the IR4311MTRPBF, so the same PCB can be built in two power tiers for different price points.
Recommended
Automotive Aftermarket Amplifier
The IR4301MTRPBF can be used in an automotive aftermarket amplifier where a 12 V supply and a 4 ohm speaker are standard. Two IR4301M devices provide 160 W per channel in a stereo amp, and four devices provide 4-channel surround. The integrated analog input accepts signal from a head unit or DSP, and the OCP/OTP/UVP protection handles load dumps, shorted speaker wires, and thermal stress in a trunk-mounted enclosure. The industrial temperature grade supports under-hood or trunk operation, and the 5x6 mm footprint allows a compact chassis with multiple channels.
Recommended
Mini Component Stereo System
A mini component stereo system uses an IR4301MTRPBF per channel to deliver 160 W to each bookshelf speaker from a single integrated power block. The analog input is driven by the system's preamp, and the small PowerVQFN22 footprint lets the entire 2-channel amp fit on a board the size of a credit card. The no-heatsink design allows a slim aluminum chassis without ventilation, and the 250 uVrms noise floor preserves the dynamic range of CD and high-res audio sources. The IR43x1 family pin compatibility supports a single SKU strategy across multiple power tiers.
Recommended
Recommended Products Summary
Engineering reference data for IR4301MTRPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IR4311MTRPBF | IR4321MTRPBF | IR4301MTRPBF |
|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies - same | Infineon Technologies - same | Infineon Technologies - same |
| Package | 22-PowerVQFN (5x6 mm) | 22-PowerVQFN (5x6 mm) - same | 22-PowerVQFN (5x6 mm) - same | 22-PowerVQFN (5x6 mm) - same |
| Output Channels | 1 (Mono) | 1 (Mono) | 1 (Mono) | 1 (Mono) |
| Output Power | 160 W into 4 ohm | Higher than IR4301M | Highest of the family | 160 W into 4 ohm - identical |
| Topology | Class D, integrated MOSFETs | Class D, integrated MOSFETs | Class D, integrated MOSFETs | Class D, integrated MOSFETs |
| Output Noise | 250 uVrms | Same family noise floor | Same family noise floor | 250 uVrms - identical |
| Input Type | Analog differential or single-ended | Analog differential or single-ended | Analog differential or single-ended | Analog differential or single-ended |
| Supply | Split or single supply | Split or single supply, higher rating | Split or single supply, higher rating | Split or single supply - identical |
| Heatsink Required | No (in typical music playback) | No (in typical music playback) | No (in typical music playback) | No (in typical music playback) |
| Protection | OCP, OTP, UVP | OCP, OTP, UVP | OCP, OTP, UVP | OCP, OTP, UVP |
Key Differentiators
- Highest power density in the IR43x1 family (vs IR4311MTRPBF)
- Fully integrated analog input, no DSP required (vs TPA3116D2)
- Infineon/IR portfolio longevity and second-source (vs IRS2092STRPBF)
Design Notes
The IR4301MTRPBF is designed to operate without a mechanical heatsink, but the exposed thermal pad still requires a substantial copper pour on the PCB. Per the Infineon datasheet, the 5x6 mm PowerVQFN22 should be soldered to a pad that connects to at least 1 square inch (about 6 square cm) of inner-layer and bottom-layer copper. Without that copper area, the device will enter OTP shutdown at sustained high output. Estimated: at 160 W into 4 ohm and 90 percent efficiency, the IR4301M dissipates roughly 18 W internally; the data sheet thermal resistance and the PCB copper area together determine the junction temperature rise.
Place the LC output filter as close as possible to the IR4301M output pins to minimize the high-frequency switching loop. Use a 10 to 22 uH ferrite-core inductor with low DCR and an X7R ceramic or film filter capacitor rated for the full supply rail. Keep the analog input traces short and away from the output switching node to prevent the PWM edge from coupling into the audio band. The exposed pad should have multiple thermal vias to the inner copper plane to spread heat away from the die.
Do not connect a 2 ohm load to the IR4301MTRPBF; the datasheet specifies a 4 ohm minimum. The integrated OCP will trip and the amp will not produce rated power. Also, do not omit the input AC-coupling capacitor on the analog input pins - the IR4301M expects a DC-biased analog input from the source. The PBF suffix is critical: the lead-free finish is required for RoHS-compliant products, and substituting a non-PBF variant will fail compliance even if the die is identical.
Compliance Information
Lead-free PBF finish per part suffix. Industrial temperature grade. Not AEC-Q100 qualified - see IR43x1 automotive variants if needed.
